Patent Publication Number: US-2020282364-A1

Title: Systems and Methods of Controlling a Concentration of Microbubbles and Nanobubbles of a Solution for Treatment of a Product

Description:
FIELD 
     The present application is a non-provisional of and claims priority to U.S. Provisional Patent Application No. 62/815,491 filed on Mar. 8, 2019 and entitled “Methods and Systems for Cleaning by Selective Use of Microbubbles and Nanobubbles”, which is incorporated herein by reference in its entirety. 
    
    
     GOVERNMENT LICENSE RIGHTS 
     This invention was made with Government support under grant number 1R43FD006465-01 awarded by the Food and Drug Administration and under grant number 2019-33610-29764 awarded by the United States Department of Agriculture. The Government has certain rights in the invention. 
    
    
     FIELD 
     The present disclosure is generally related to systems and methods for cleaning selected items by selective use of microbubbles, nanobubbles, or any combination thereof. More particularly, the present disclosure relates to systems and methods of cleaning one or more items by controlling a gas composition and ratio of microbubbles to nanobubbles in a solution. The solution may be used to, for example, clean various food products, such as fruits and vegetables, to treat water or waste via floatation and settling separation processes, to deliver nutrients in aerobic and anaerobic processes, and so on. 
     BACKGROUND 
     Conventionally, washing or sterilizing items may leave residual detergents, chemicals, or other residual contaminants, which may contaminate an object during the cleaning process. Such residual contaminants may be undesirable in a variety of contexts, including food processing and so on. 
     SUMMARY 
     In some embodiments, systems and methods are described below that may be configured to control a ratio of nanobubbles to microbubbles in a solution to provide a selected effect, such as cleaning, delivering nutrients, providing a protective film, providing other effects, or any combination thereof. Additionally, the systems and methods may include controlling a gas composition of the microbubbles, the nanobubbles, or both to provide the selected effect. In some implementations, a system may include controlling both a ratio of the nanobubbles to the microbubbles and the ratio of bubbles of one chemical composition to bubbles of another chemical composition. Other implementations are also possible. 
     In some embodiments, a system may include a circulation subsystem and a circuit coupled to the circulation subsystem. The circuit may provide one or more signals to control the circulation subsystem to circulate a treatment solution including one or more of microbubbles or nanobubbles in a selected ratio. In one aspect, the nanobubbles may include a first gas, and the microbubbles may include a second gas. In another aspect, the treatment solution may include a first percentage of nanobubbles and a second percentage of microbubbles. 
     In other embodiments, a method of treating an object with a treatment solution may include infusing one or more gases into a liquid to form a solution including microbubbles and nanobubbles and separating the solution into a first solution including predominately microbubbles and a second solution including predominately nanobubbles. For example, the first solution may be a solution matrix comprised exclusively of nanobubbles. The second solution may be a solution matrix comprised of microbubbles. In some implementations, the solution matrices may also be comprised of dissolved gases or entrained gases. The method may further include determining a selected ratio of the second solution to the first solution to produce a treatment solution and providing the treatment solution to one or more nozzles to apply the treatment solution to the object. 
     In still other embodiments, a system includes a gas handling subsystem, a microbubble and nanobubble generator, a nanobubble isolation system, and a circuit. The gas handling subsystem may provide one or more gases. The microbubble and nanobubble generator may infuse a liquid with the one or more gases to produce a solution. A bubble separator system may produce a first solution including predominately microbubbles and a second solution including predominately nanobubbles. The circuit may be coupled to the bubble separator system and may provide one or more signals to control the bubble separator system to produce a treatment solution including a first amount of the first solution and a second amount of the second solution. The treatment solution may include a first percentage of microbubbles and a second percentage of nanobubbles. In some implementations, the first and second solutions may be blended within a larger treatment tank. 
     In some embodiments, a system may selectively deliver a solution matrix to a product, such as produce or other items, for a selected purpose. The solution matrix may include one or more of a first solution matrix including microbubbles, a second solution matrix including nanobubbles, and a third solution matrix including dissolved gases according to selected ratios. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description is set forth with reference to the accompanying figures. In the figures, the left most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical items or features. 
         FIG. 1  depicts a diagram of a system to provide a selected treatment solution, in accordance with certain embodiments of the present disclosure. 
         FIG. 2  depicts a block diagram of a system to provide a selected treatment solution, in accordance with certain embodiments of the present disclosure. 
         FIG. 3  depicts a diagram of a system to provide a selected treatment solution, in accordance with certain embodiments of the present disclosure. 
         FIG. 4A  depicts a block diagram of a bubble separator of the system of  FIG. 3 , in accordance with certain embodiments of the present disclosure. 
         FIG. 4B  depicts an alternative embodiment in which the bubble separator is implemented as part of a storage tank, in accordance with certain embodiments of the present disclosure. 
         FIG. 5  depicts a diagram of the gas processing system of  FIG. 3 , in accordance with certain embodiments of the present disclosure. 
         FIG. 6A  depicts a diagram of a treatment tank system including nanobubble nozzles and microbubble nozzles, in accordance with certain embodiments of the present disclosure. 
         FIG. 6B  depicts a block diagram of a nozzle of the treatment tank system of  FIG. 6A . 
         FIGS. 7A-7B  depict block diagrams of a treatment tank with nanobubble nozzles configured to direct a nanobubble solution matrix at different angles within the treatment tank, in accordance with certain embodiments of the present disclosure. 
         FIG. 8  depicts a block diagram of a control system for use with the systems of  FIGS. 1-7 , in accordance with certain embodiments of the present disclosure. 
         FIG. 9  depicts a flow diagram of a method of removing contaminants from a selected object, in accordance with certain embodiments of the present disclosure. 
     
    
    
     While implementations are described in this disclosure by way of example, those skilled in the art will recognize that the implementations are not limited to the examples or figures described. It should be understood that the figures and detailed description thereto are not intended to limit implementations to the form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope as defined by the appended claims. The headings used in this disclosure are for organizational purposes only and are not meant to limit the scope of the description or the claims. As used throughout this application, the word “may” is used in a permissive sense (in other words, the term “may” is intended to mean “having the potential to”) instead of in a mandatory sense (as in “must”). Similarly, the terms “include”, “including”, and “includes” mean “including, but not limited to”. 
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     There are many existing functional reasons why certain gases and/or bubbles might be infused into a liquid, including to aid in processing of the liquid mixtures (such as in treating wastewater) or, separately, to utilize the liquid to help process solids (such as in washing food products). Traditionally, two options have been available to charge a gas into a liquid: (i) dissolving the gas within the liquid, which is limited by the solubility limits of the gas and the liquid; and (ii) injecting bubbles into the liquid, which has been limited by the resident time of a bubble in the liquid, as determined by the buoyancy of such bubbles. Unfortunately, neither of these methods has been very efficient, as bubble processes result in outgassing (the gas being released from the liquid), and dissolved gas is limited in concentration and has a depth dependency, resulting in uneven application. 
     Nanobubbles have been shown to stay resident in a solution for long periods of time (from days to months) due to their buoyancy force being lower than their thermal motion. The term “nanobubble” refers to a bubble formed of a selected gas and having a size that is approximately 1 micrometer or less in diameter. Nanobubbles with a diameter of 50 nanometers (nm) to about 100 nm may have a pressure of tens of atmospheres due to the surface tension within water. Calculation results for nanometer ozone bubbles indicate that hydrogen bonds of the water interact with one another and the probability of hydrogen atoms existing within each nanobubble is large. Mutual action of the nanobubbles may indicate that charge separation similar to soap can be realized at the air-liquid interface due to the size of the bubble, promoting both cleaning effects and electrostatic sterilizing effects. 
     In some implementations, the tension and surface activity of nanobubbles may be greater than bubbles having a larger diameter, particularly when the nanobubbles are introduced at a reduced temperature sufficient to compress the gas. Since the surface activity is high, the nanobubbles may absorb contaminants at the interface, removing the contaminants from the object or the solution. In some instances, nanobubbles show a relatively high-affinity fine-particle binding in connection with cleaning processes, providing a removal or cleaning affect. In some implementations, surfactants in conjunction with nanobubbles may reduce interfacial tension within the solution. 
     Additionally, nanobubbles enable hyper saturation of a solution beyond traditional solubility limits, which allows for extended ranges of concentrations of chemical and gas compositions. At reduced temperatures, the nanobubbles may be formed from compressed gas, enhancing the concentration of the gas in the nanobubbles and within the solution as the nanobubbles collapse and diffuse over time. Additionally, the nanobubbles may maintain selected gas compositions within the solution for extended periods through time-rate reduction of out-gassing. 
     Embodiments of systems and methods described below may be used to produce a treatment solution infused with bubbles of one or more selected gas compositions and optionally with a selected concentration of microbubbles (bubbles of a selected gas with a diameter between approximately 10 and 100 micrometers), nanobubbles (with a diameter of approximately 1 micrometer or less), dissolved gas, or any combination thereof. In one implementation, the systems may produce a treatment solution (e.g., a solution matrix) comprising a liquid infused predominately with microbubbles. The microbubble solution may include a higher concentration of dissolved gas as the microbubbles may break down faster than nanobubbles of similar chemical composition. In some implementations, the microbubble solution may provide a treatment time that may be shorter than that of a solution matrix consisting of a nanobubble solution because of the faster breakdown time of the chemical microbubbles in the solution. Additionally, the microbubbles within the solution may demonstrate greater movement than nanobubbles, which may aid in dislodging particles or other contaminants. 
     In other implementations, the system may produce a treatment solution (e.g., a solution matrix) infused with a mixture of mixture of microbubbles and nanobubbles. The ratio of the nanobubbles and the microbubbles may be controlled to provide a selected bubble concentration. In this example, the microbubbles may breakdown faster and move more than the nanobubbles within the solution, and the nanobubbles may collapse or diffuse more slowly over time than the microbubbles, providing a time-release effect. The resulting solution may provide a selected combination of cleaning and decontamination. 
     In some implementations, the timing and location of the introduction of the solution matrices (a first solution matrix of liquid-infused with microbubbles and nanobubbles, a second solution matrix of liquid-infused with nanobubbles, a third solution matrix of liquid-infused with dissolved gas, or any combination thereof) may be varied to enhance a cleaning effect. For example, in a treatment tank, the first solution of microbubbles may be introduced at a bottom portion of the tank so that the microbubbles can rise from the bottom of the treatment tank, through and around an object being treated, and to the top of the treatment tank. The second solution of nanobubbles may be introduced along the sides and near a top of the treatment tank, and the nanobubbles may diffuse throughout the treatment tank. Since nanobubbles tend to distribute throughout the treatment solution, the nanobubbles may be introduced at or near a top portion of the treatment tank. 
     Further, in some implementations, a product may be exposed to a second solution matrix comprised primarily of nanobubbles in a first portion of a treatment process. The product may be exposed to one or more of a first solution matrix comprised primarily of microbubbles or the second solution matrix in a second portion of the treatment process. In some implementations, in a third portion of the treatment tank, the first solution matrix of microbubbles may be introduced and directed to separate contaminants from the treatment solution, such as by bubbling the contaminated or fouled treatment solution to a top of the solution within the treatment tank, where the contaminated or fouled treatment solution may be filtered or skimmed from at or near the surface of the treatment solution. 
     In some implementations, the second solution of nanobubbles may maintain a stream or jet for a first distance within the treatment tank before spreading out and creating turbulence. The third solution of dissolved gas may be included with the first solution or the second solution or both, or may be introduced separately. In some instances, the turbulence from the stream or jet of the second solution of nanobubbles and additional turbulence from the bubbling of the microbubbles may cooperate to provide a selected treatment. 
     In an example, the nanobubbles may facilitate dislodging of contaminants from the surface of a product. The microbubbles may also facilitate dislodging of the contaminants and aid in floating such particulates to the surface for removal. For example, the microbubbles may operate within the treatment solution to remove dirt from freshly harvested produce. Other implementations are also possible. 
     In another implementation, the system may produce a treatment solution that includes a liquid infused predominately with nanobubbles. The nanobubbles may remain in solution for an extended period, enabling a treatment bath that may clean or decontaminate a product over a period of time. In some instances, the nanobubbles may collapse or diffuse over time, providing a time-release chemical treatment for the product. Other implementations are also possible. 
     In still another implementation, the system may produce a treatment solution that includes a liquid containing dissolved gas. The dissolved gas may provide faster reaction time for killing certain bacteria and may operate to change the pH of the treatment solution but may not provide the same particulate cleaning operation as the bubble infused solutions. The system may combine the liquid infused with the dissolved gas with one or more solution matrices including microbubbles, nanobubbles, or both. 
     In some implementation, the dissolved gas solution, the microbubble solution, the microbubble-nanobubble mixture solution, or the nanobubble solution may be used to treat various products and surfaces. The selected solution may be applied to a product via application as a spray to the surface of the product, via infusion into a treatment container including water in which the product is immersed, or a combination thereof. The infusion of the dissolved gas, the microbubbles, the nanobubbles, the microbubble-nanobubble mixture, or any combination thereof may be used to destroy and remove bacteria, viruses, and other harmful pathogens from the surface of the product. In some instances, the treatment may include a solution matrix to promote ripening, to extend the shelf life, or to provide a protective coating. Other implementations are also possible. 
     In some implementations, the dissolved gas solution, the microbubble solution, the microbubble-nanobubble mixture solution, the nanobubble solution, or any combination thereof may provide aeration to promote aerobic processes; change the pH of the treatment solution; and so on. In the case of certain food products, the treatment solution may be selected to prolong the shelf-life or advance the ripening rate of such food product. 
     In some implementations, one or more solution matrices may be used to dislodge certain particulates from the surface of a product and to float such particulates to the surface (for example, removing dirt from a head of lettuce). In some implementations, the sizes of the bubbles may be controlled to facilitate the floating of such particulates to the surface, to control timing of the chemical concentration of the treatment solution, and so on. Additionally, in some implementations, the angle of the nozzles to introduce the solution into a treatment bath may be controlled to provide a selected particulate removal affect. 
     Specific gases may be selected for infusion into liquid to achieve the desired physiochemical effects. For example, carbon dioxide gas may be injected to increase the acidity of a liquid. In another example, nitrogen gas may be injected to act as a surfactant for the liquid. In still another example, nitrogen gas, ethylene gas, or a combination thereof may be injected to promote ripening in certain food products. In another example, the solution may be varied over time to provide selected affects. Such gases may be dissolved directly into the treatment solution or may be injected into the treatment solution in the form of microbubbles, nanobubbles, or both. In some implementations, such as when it may be desirable to limit the venting of the gas to atmosphere, the solution matrix that is introduced may be primarily comprised of nanobubbles, which remain in solution for a longer period of time than larger bubbles. Other implementations are also possible. 
     In some implementations, the systems may include sensors and a processor coupled to the sensors and to one or more system components to provide a fully automated system. The automated system may be configured to adjust gas concentrations, bubble sizes, or both to enable efficient automatic deployment of gas resources and liquid flow to implement effective treatment of a product. In some implementations, the treatment may include cleaning a product, prolonging the shelf-life of the product, ripening the product, cleaning the product, or any combination thereof. 
       FIG. 1  depicts a diagram of a system  100  to provide a selected treatment solution, in accordance with certain embodiments of the present disclosure. The system  100  may include a treatment tank  102  including a treatment solution  104 . In this example, the treatment solution  104  is depicted as a solution bath in which an object  110  (such as a food product, a device, or another item) is immersed. However, it should be appreciated that the treatment tank  102  may include one or more sprayers or spray nozzles to dispense a solution onto the object  110  within the treatment tank. In some implementations, the treatment tank  102  may include a plurality of nozzles to direct the solution toward the object  110 , whether the object  110  is completely immersed or partially immersed in the treatment solution  104 , or the object is simply placed within the treatment tank  102  or on a surface. 
     The treatment tank  102  may be coupled to a microbubble and nanobubble solution source  106  via a delivery system  108 . In an example, the microbubble and nanobubble solution source  106  may be configured to generate a first solution matrix comprised of microbubbles and possibly nanobubbles, a second solution matrix comprised of nanobubbles, a third solution matrix comprised of a mixture of microbubbles and nanobubbles in a selected ratio, a fourth solution matrix comprised of a liquid infused with a dissolved gas, or any combination thereof. The delivery system  108  may include one or more valves to direct flow of the solution from the source  106  to the treatment tank  102  and back to the source  106 . 
     The system  100  may further include one or more sensors  112 . The sensors  112  may include first sensors  112 ( 1 ) coupled to the source  106 , to the delivery system  108 , or any combination thereof. The sensors  112  may also include second sensors  112 ( 2 ) coupled to the treatment tank  102 . The sensors  112  may be configured to determine one or more parameters, including temperature, concentration of chemicals, concentration of bubbles, bubble sizes, and so on. In some implementations, the sensors  112  may also be configured to detect contaminants associated with the object  110  and to provide the information to a control system  114 . 
     The control system  114  may be implemented as a circuit, a computing device, or any combination thereof. The control system  114  may be configured to communicate with the one or more sensors  112 , with one or more actuatable valves, and with one or more computing devices  118  via a network  116 . The network  116  may include one or more networks. In an example, the network  116  may represent an Internet connection as well as local area networks. In some implementations, the control system  114  may selectively control one or more valves or other actuatable components associated with one or more of the source  106 , the delivery system  108 , and the treatment tank  102  to achieve a selected affect. 
     The computing devices  118  may be configured to receive data from the control system  114  and to provide instructions to adjust operation of the control system  114 . In some implementations, the control system  114  may receive software upgrades and parameter adjustments from one of the computing devices  118 , which may be associated with an authorized user. In other implementations, such changes may be implemented via one or more input/output interfaces of the control system  114 . Other implementations are also possible. 
     The control system  114  may be configured to control the source  106 , the delivery system  108 , or both to provide a selected solution. For example, the control system  114  may control one or more of the source  106  or the delivery system  108  to provide a treatment solution  104  having a selected composition of dissolved gas, nanobubbles, microbubbles, or any combination thereof. Additionally, the control system  114  may control one or more of the source  106  or the delivery system  108  to determine a chemical composition of the dissolved gas, the nanobubbles, the microbubbles, the treatment solution  104 , or any combination thereof. In some implementations, the control system  114  may also control a ratio of nanobubbles to microbubbles within the solution as well as the relative concentrations of different gases within the microbubbles and the nanobubbles. Other implementations are also possible. 
     The system  100  may be implemented in a variety of different ways, enabling adjustment of the chemical composition, the composition of the treatment fluid  104  (in terms of bubbles, chemical composition, or both), the fluid flow rates, the fluid turbulence, and so on. An example of an overview of the system  100  is described below with respect to  FIG. 2 . 
       FIG. 2  depicts a block diagram of a system  200  to provide a selected treatment solution, in accordance with certain embodiments of the present disclosure. The system  200  may represent an implementation of the system  100  of  FIG. 1 , with some of the elements omitted from the drawing for ease of discussion. 
     The system  200  may include a control circuit  202 , which may be an implementation of the control system  114  of  FIG. 1 . The system  200  may include one or more gas handling subsystems  204 , one or more fluid circulation paths  206 , a nanobubble isolation subsystem  208 , and one or more sensing modules  210 , which may be embodiments of the sensors  112  in  FIG. 1 . The gas handling subsystems  204  may include gas canisters or sources, valves, conduits, and bubble formation components for producing nanobubbles and microbubbles. The gas handling subsystems  204  may be responsive to signals from the control circuit  202  to produce a selected concentration and type of bubbles. 
     The solution circulation paths  206  may include conduits and valves to direct fluid flow from the gas handling subsystems  204  to one or more other components, such as storage tanks, treatment tank  102 , nozzles, sprayers, and so on. The solution circulation paths  206  may include components, such as actuatable valves, which may be responsive to signals from the control circuit  202  to open and close to direct fluid flow. 
     The nanobubble isolation subsystem  208  may be configured to produce bubbles. In some implementations, the nanobubble isolation subsystem  208  may isolate nanobubbles from other bubbles, including microbubbles and macro-bubbles, to provide a volume of solution including nanobubbles. The nanobubble isolation subsystem  208  may include bubble generators as well as actuatable valves responsive to signals from the control circuit  202  to control production of nanobubbles. 
     In the illustrated example, the control circuit  202  may be coupled to the one or more gas handling subsystems  204 , to the one or more fluid circulation paths  206 , and to the nanobubble isolation subsystem  208 . The nanobubble isolation subsystem  208  may be coupled to the gas handling subsystems  204  to deliver a solution matrix comprised of nanobubbles. The sensing modules  210  may be coupled to each of the one or more gas handling subsystems  204 , the one or more fluid circulation paths  206 , and the nanobubble isolation subsystem  208 . The sensing modules  210  may be configured to determine one or more parameters associated with the various subsystems and paths and to provide data related to the sensed parameters to the control circuit  202 . 
     In some implementations, the production of a first solution comprised of microbubbles (and some nanobubbles) and a second solution comprised of nanobubbles can be regulated by the control circuit  202 . Further, the control circuit  202  may control a mixture of the first solution of microbubbles and the second solution of nanobubbles based on input gathered by one or more sensors  112 . The control circuit  202  may include a plurality of closed-loop control routines that may allow, for example, setpoint targets to be achieved and held at desired levels while counteracting disturbances such as variations in ambient temperature, feedstock or organic load. The control circuit  202  may be manually tuned or self-adapting to enable automated control of the system  200  during normal operation. In some implementations, the control circuit  202  may control the ratios of the first solution and the second solution, the timing of the application of the first solution and the second solution, and so on. 
     The system  200  may include a plurality of components, some of which may be controlled by the control circuit  202 . An example of an implementation of the system  200  is described below with respect to  FIG. 3 . 
       FIG. 3  depicts a diagram of a system  300  to provide a selected treatment solution, in accordance with certain embodiments of the present disclosure. The system  300  may be an implementation of the systems  100  and  200  of  FIGS. 1 and 2 . 
     The system  300  may include a gas supply  302 , which may include a plurality of gas canisters, another gas source, or any combination thereof. The gas supply  302  may provide selected gases, such as carbon dioxide, nitrogen, and so on. The gas supply  302  may include primary source gases that can be contained gas canisters at high pressure, extracted from the air by using a concentrator to separate air into its components (oxygen, nitrogen, and so on), or any combination thereof. Specific gases can be selected for infusion into liquid to provide a solution matrix having certain physiochemical effects. For example, carbon dioxide can act as an acid. Nitrogen gas may act as a surfactant for the liquid. Ethylene gas can act as a ripening agent for certain food products. Other gases or gas compositions may also be used. 
     The gas supply  302  may be coupled to one or more gas processing units  306  by one or more valves  304 . In the illustrated example, the gas supply  302  may be coupled to the gas processing unit  306  by a valve  304 . The gas processing unit  306  may include a thermal unit to adjust a temperature of the gas, an ozone generator, other components, or any combination thereof. The gas processing unit  306  may be configured to alter certain gas properties. In an example, the gas processing unit can ionize molecular gaseous oxygen to result in a proportional recombination of ozone or can be used to cool or heat a gas to modify its density prior to injection. 
     The system  300  may further include a microbubble and nanobubble generator  310  coupled to the gas processing unit  306  by a gas supply line  308  and a valve. The system  300  may also include a microbubble generator  314  by the gas supply line  308  and the valve. A liquid source  312  may provide a selected liquid to the microbubble and nanobubble generator  312  and to the microbubble generator  314  by valves. The microbubble and nanobubble generator  310  may include an input coupled to a filter  326  via a circulation loop  324  and a valve and may include an output coupled to a microbubble and nanobubble holding tank  316 . The microbubble generator includes an input coupled to the filter  326  via the circulation loop  324  and includes an output coupled to the treatment tank  102  through a treatment tank line  336  and a valve. 
     The system  300  also includes a nanobubble holding tank  322  that is coupled to the microbubble and nanobubble holding tank  316  by a bubble separator  320  and a valve. The bubble separator  320  may remove microbubbles from the solution and may provide the resulting filtered nanobubble solution to the nanobubble holding tank  322 . The nanobubble holding tank  322  is also coupled to the treatment tank line  336  by a valve. The microbubble and nanobubble holding tank  316 , the bubble separator  320 , and the nanobubble holding tank  322 , as well as associated valves and lines, may be part of a storage subsystem  342 , which may store the solution matrices prior to use. 
     The treatment tank  102  may include one or more nozzles to direct a selected solution within the treatment tank  102 . The nozzles  338  may include (in air or underwater) sprayers, turbulence generators, and other fluid flow components to produce a desired flow and application of the solution. The treatment tank  102  may also include one or more drains  340  or filters to drain the solution and optionally to filter particulates. Other implementations are also possible. 
     The system  300  may also include a valve to couple the treatment tank line  336  to a nanobubble reactivator  332  and a nanobubble destructor  334 . The nanobubble reactivator  332  may be configured to deliver electromagnetic energy to gas within the solution and by changing the constituent form of such gas. In one example, the nanobubble reactivator  332  may be configured to ionize molecular oxygen (or other gases) to allow for recombination to ozone. The nanobubble destructor  334  may be configured to destroy nanobubbles prior to disposal of the solution via the drain  340 . For example, if disposal procedures or regulations prevent direct disposal of the solution through the drain  340 , the nanobubble destructor  334  may be activated to destroy the nanobubbles prior to disposal. In some implementations, the nanobubble destructor  334  may destroy bubbles, for example, by returning a liquid mixture to a vapor state and depressurizing. 
     The system  300  may also include a recirculation pump  330  to receive fluid from the nanobubble reactivator  332  or the nanobubble destructor  334  and to provide the fluid to the microbubble and nanobubble generator  310  and the microbubble generator  314  through filters  328  and  326 , the circulation loop  324 , and valves. 
     In some implementations, the control system  114  (or control circuit  202 ) may be coupled to each of the valves  304  and the other valves to control fluid flow throughout the system  300 . Further, in some implementations, one or more actuators may be included that may be responsive to signals from the control system  114  (or control circuit  202 ) to adjust fluid flow, to adjust a delivery angle, and so on. Other implementations are also possible. 
     In an example, the control system  114  (or control circuit  202 ) may control the valves  304  to provide a selected gas from one or more canisters of the gas supply  302 . The gas processing units  306  may be configured to deliver the selected gas via the gas supply line  308  to the generators  310  and  314 , which may produce a microbubble and nanobubble solution, which may be provided to the microbubble and nanobubble holding tank  316 . Nanobubbles may be extracted from the mixture using the bubble separator  320 , and the resulting nanobubble solution may be provided to the nanobubble holding tank  322 . 
     The control system  114  (or control circuit  202 ) may selectively control the gas supply  302 , the generators  310  and  314 , and the holding tanks  316  and  322  to provide a solution having one or more of a selected chemical composition, a selected ratio of nanobubbles to microbubbles, and so on. The system  300  may provide solutions of gas-infused liquids (including bubbles of selected size) having a selected chemical composition to provide a treatment solution in the form of a wash or spray. 
     In some implementations, sensors  112  may be distributed throughout the system  300  to determine parameters at various point. In one example, the sensors  112  may determine selected parameters, which may be used by the control system  114  (or the control circuit  202 ) to manage operation of the various components to provide a selected treatment of a product. It should be appreciated that the solution may include a plurality of gases, which may be infused within the solution in different forms (e.g., dissolved gas, microbubbles, nanobubbles, or any combination thereof). In one example, a first solution matrix may be comprised of microbubbles, a second solution matrix comprised of nanobubbles, a third solution matrix infused with dissolved gas, or any combination thereof. The control system  114  (or control circuit  202 ) may control the various components to provide the second solution matrix of nanobubbles having selected concentrations of the first gas and the second gas, the first solution matrix comprised of microbubbles having selected concentrations of the first gas and the second gas, the third solution matrix having selected concentrations of dissolved gas, or any combination thereof. 
     The circulation loop  324  may operate to inject gases into a liquid and to control such gas/liquid mixtures to benefit cleaning processes, such as those using nozzles  338 , which may be submerged in a treatment solution  104  within the treatment tank  102  or which may spray the solution onto the object. One or more gases from the gas handling subsystem  402  may be provided to the microbubble generator  314  and to the microbubble and nanobubble generator  310 . 
     In some implementations, the microbubble generator  314  may include a pump with controlled cavitation device or a simple gas mixture device such as a venturi valve. Other microbubble generation devices are also possible. 
     The microbubble and nanobubble generator  310  may include a pump capable of producing microbubbles and nanobubbles or just nanobubbles through cavitation, a device to provide injection of gas into a shear flow of liquid, a device to manage high pressure saturation and subsequent pressure drops, an electrolysis device, or any combination thereof. 
     The liquid source  312  may provide a fluid to both the microbubble generator  314  and the microbubble and nanobubble generator  310 . The generators  310  and  314  may combine the fluid and the gas to produce a solution that includes microbubbles and nanobubbles. The solution may be fed from internal sources, external sources, or both, including a return line from treatment tank  102  or an external water source such as municipal or well water. The filters  328  and  326  may remove solid wastes before recirculation. 
     The valves may be used to introduce to the circulation loop  324  portions of a solution including dissolved gas, macro-bubbles, nanobubbles, or any combination thereof. Such portions may be determined based on the intended application. For example, a portion containing predominately nanobubbles filled with ozone gas may be used to sanitize wash water. Or for example, carbon dioxide can be used to lower the pH of a solution by a selected amount. The nanobubbles may result in minimal outgassing to mitigate environmental hazards while retaining more of the gas in solution. Further, certain gases in the nanobubble form may decay slower than others. As an additional example, microbubbles can be used to aid agitation and dislodgement of inorganic residue in separation processes of floatation and settling. Cleaning of products and liquid streams can occur through interfaces such as the treatment tank  102  with nozzles  338  (submerged, spray, or both). In an example, the solution may be sprayed via nozzles  338  directly onto objects  110 , such as post-harvested food. 
     The treatment tank line  336  fed from the treatment tank  104  may interact with the gas-infused solution to remove or recharge the gas bubbles or the liquid. A drain  340  may dispose of liquids and may be opened and closed based on signals from the control system  114  (or control circuit  202 ), allowing for controlled discharge at selected times, such as at the end of a work cycle or when the sensors  112  indicate that the treatment solution  104  contains too many containments to support further washing. 
     The recirculation pump  330  may be used to circulate the solution from the treatment tank  104 , by drawing the solution through the filter  328  and feeding a nanobubble reactivator  332  or a nanobubble destructor  334 . The solution may be returned to the treatment tank  102  by a treatment tank line  336 . The nanobubble reactivator  332  may produce results similar to the gas processing unit  306  by imparting electromagnetic energy to gas and changing the constituent form of such gas, such as, without limitation, ionizing molecular oxygen to allow for recombination to ozone. In some implementations, the nanobubble destructor  334  may be activated prior to disposal of the solution through the drain  340  if the disposal procedures or regulations prevent direct disposal of the gas-infused liquid. The nanobubble destructor  334  may destroy bubbles through methods such as returning the solution to a vapor state and depressurizing. Other implementations are also possible. 
     The gas supply  302  may include primary source gases that can be contained in gas canisters at high pressure, compressed air, or gases extracted from the atmosphere by using a concentrator to separate air into its components (e.g., oxygen, nitrogen, and so on), or any combination thereof. Specific gases can be selected for infusion into liquid to achieve certain physiochemical effects. For example, the control system  114  or the control circuit  202  may control one or more of the valves  304  to deliver the selected gas from one or more of the canisters for infusion into the liquid. For example, carbon dioxide gas can act as an acid, nitrogen gas can act as a surfactant for the liquid, or ethylene gas can act as a ripening agent for certain food products. The control system  114  (or control circuit  202 ) may control the valves  304  to deliver selected gases in specific proportions based on feedback from instrumentation of one or more of the sensors  112 . A high-pressure gas supply line  308  may be used to inject gas into the circulation loop  334  to be fed into microbubble and nanobubble generator  310  and the microbubble generator  314 . 
     In this example, the gas may be processed in the gas processing unit  306  to alter certain gas properties. For example, the gas processing unit  306  may ionize molecular gaseous oxygen for proportional recombination into ozone. The gas handling subsystem  204  may also be fed with recycled gas from a nanobubble isolation subsystem  208  through a gas recycle line  318  to promote more efficient use of gas. Other implementations are also possible. 
     The nanobubble isolation subsystem  208  may be coupled to the gas handling subsystem  204  and to the solution circulation paths or subsystem  206 . The nanobubble isolation subsystem  208  may receive a first input from the microbubble and nanobubble generator  310 , which may provide a microbubble and nanobubble solution to the microbubble and nanobubble holding tank  316 . The microbubble and nanobubble holding tank  316  may facilitate recapture of outgassing microbubbles to feed back into gas handling subsystem  204  through gas recycle line  318 . The microbubble and nanobubble holding tank  316  may facilitate retention of microbubbles for a period of time prior to application to the treatment tank  104 . The nanobubble isolation subsystem  208  may include a valve to couple the microbubble and nanobubble holding tank  316  to a bubble separator  320  via a valve to provide nanobubbles to a nanobubble holding tank  322 . The recapture of outgassing microbubbles may increase the efficiency of gas utilization and may help maintain atmospheric levels of certain gases (for example, ozone) at nonhazardous levels. The microbubble and nanobubble solution may be fed to the bubble separator  320  from the bottom of microbubble and nanobubble holding tank  316  to amplify the nanobubble to microbubble ratio. In one implementation, microbubble and nanobubble holding tank  316  may have a recycling line  318  coupled to the microbubble and nanobubble generator  310  without circulating through the circulation loop  324 . The bubble separator  320  may filter nanobubbles from the microbubble and nanobubble solution using, for example, degassing valve principles and/or other separation techniques related to differences in properties between the bubble distributions. Such separation processes can result in a solution infused predominately with nanobubbles. Such a nanobubble solution may be preferable to micro-nanobubble solutions in instances when the extra buoyancy of microbubbles is not needed or when a hyper saturation of one or more gases is favored to achieve certain physiochemical effects. For example, nanobubbles may be preferred in a situation when aerobic processes are desired to be accelerated in a waste holding pond through the addition of oxygen without leading to floatation resulting in overpowering odors (e.g. livestock farm). Since the nanobubbles remain in solution longer than the microbubbles, the nanobubbles may operate to provide the desired treatment processes without the rising of bubbles within the pond that may cause the release of the odors to that atmosphere that larger bubbles may cause. The bubble separator  320  may include an output coupled to the nanobubble holding tank  322 . 
       FIG. 4A  depicts a block diagram  400  of a bubble separator  320  of the system  300  of  FIG. 3 , in accordance with certain embodiments of the present disclosure. The bubble separator  320  may include an enclosure  410  including an input to receive a solution matrix  402  comprised of a liquid infused with microbubbles, nanobubbles, one or more dissolved gas, or any combination thereof. The bubble separator  320  may include a first output near an upper portion of the enclosure  410  to provide a microbubble solution matrix  404  and a second output near a lower portion of the enclosure  410  to provide a nanobubble solution matrix  406 . In some implementations, the microbubble solution matrix  404  may include a liquid infused with microbubbles and possibly some nanobubbles. In some implementations, the nanobubble solution matrix  406  may include a liquid infused with nanobubbles. In both instances, the liquid infused with nanobubbles or the liquid infused with microbubbles may include one or more dissolved gases. 
     In some implementations, the bubble separator  320  may include a filter  408  that may allow nanobubbles to fall through to a lower portion of the enclosure  410  while preventing microbubbles from passing through. The filter  408  may be implemented as a baffle, a semi-permeable membrane, a screen, or another construct within the enclosure  410  that makes it difficult for microbubbles to flow through, but the diffusion/flow process may allow nanobubbles entrained within in the solution matrix  402  to penetrate the filter  408 . 
     In this example, the bubble separator  320  operates to produce a first solution matrix that includes microbubbles and nanobubbles and to produce a second solution matrix that includes nanobubbles. The first solution may be provided as a microbubble solution matrix  404  that may be provided to the microbubble and nanobubble holding tank  316  in  FIG. 3 . The second solution may be provided as a nanobubble solution matrix  406  that may be provided to the nanobubble holding tank  322  in  FIG. 3 . 
     It should be appreciated that the separation of the microbubbles and the nanobubbles may be provided within the storage tank, instead of providing a bubble separator  320 . An example of such an implementation is described below with respect to  FIG. 4B . 
       FIG. 4B  depicts an alternative embodiment in which the bubble separator  320  is implemented as part of a storage tank, in accordance with certain embodiments of the present disclosure. In  FIG. 4B , an embodiment of a storage subsystem  342  is described that may include a solution matrix storage tank  420 . The solution matrix storage tank  420  may include an input to receive the solution matrix  402 . The input may be positioned in the middle or at an upper portion of the solution matrix storage tank  420 . The solution matrix storage tank  420  may include a solution matrix  422  that includes a liquid infused with microbubbles, nanobubbles, and dissolved gas. 
     The solution matrix storage tank  420  may further include a first output to provide a microbubble solution matrix  404  and a second output to provide a nanobubble solution matrix  406 . The solution matrix storage tank  420  may include a filter  424  that may be positioned between the first output and the second output. The filter  424  may be implemented as a baffle, a semi-permeable membrane, a screen, or another construct within the enclosure  410  that makes it difficult for microbubbles to flow through, but the diffusion/flow process may allow nanobubbles entrained within in the solution matrix  402  to penetrate the filter  408 . 
       FIG. 5  depicts a diagram  500  of the gas processing system  306  of  FIG. 3 , in accordance with certain embodiments of the present disclosure. The gas processing system  306  may include an ozone generator  502 , a thermal unit  504 , and a pressure management unit  506 . The ozone generator  502  may generate ozone gas and provide the ozone gas to the thermal unit  504 . 
     The thermal unit  504  may include an input to receive one or more gases. The thermal unit  504  may be configured to cool and compress the one or more gases. The thermal unit  504  may include an output to provide the thermally treated gas to a pressure management unit  506 . The pressure management unit  506  may be configured to provide an output gas stream  510  having a selected pressure. 
     In the illustrated example, the ozone generator  502 , the thermal unit  504 , and the pressure management unit  506  may be coupled to a control system  114 , which may provide control signals to control the production of the output gas stream  510 . In some implementations, the control system  114  may be configured to adjust the temperature of the gases via a control signal to the thermal unit  504 . The control system  114  may selectively activate the ozone generator  502  to produce ozone gas or to activate one or more valves to selectively deliver one or more gases  508  to the thermal unit  504 . The control system  114  may also send one or more signals to the pressure management unit  506  to manage the pressure of the output gas stream  510 . Other implementations are also possible. 
       FIG. 6A  depicts a diagram of a treatment tank system  600  including nanobubble nozzles  606  and microbubble nozzles  608 , in accordance with certain embodiments of the present disclosure. The treatment tank system  600  may include a treatment tank  602  including a plurality of tank sides  612  and a tank bottom  614 . The nanobubble nozzles  606  may be provided in the tank sides  612 , and the microbubble nozzles  604  may be provided in the tank bottom  614 . The microbubble solution matrix  404  provided through the microbubble nozzles  608  may be positioned on the tank bottom  614  so that the microbubbles may rise within the treatment tank  602 . 
     In this example, the treatment tank  602  may include an item conveyance system  610  that advances one or more objects from a first side (a left side in the drawing) to a second side and out of the treatment tank  602 . In this example, the nanobubble nozzles  606  may be positioned on the left side and middle portion of the treatment tank  602 , and the microbubble nozzles  608  may be positioned toward the right side of the treatment tank  602 . In this particular implementation, the product or item may be processed using the nanobubble solution matrix  406  first, and then may be processed using the microbubble solution matrix  404 . In other implementations, the microbubble solution matrix  404  may be applied to the product throughout the treatment tank  602 . 
     In the illustrated example, the microbubble solution matrix  404  may include a liquid infused with microbubbles, which may rise quickly through the solution in the treatment tank  602 . In this example, the nanobubble solution matrix  406  may create current flow within the treatment solution, pushing the product towards the microbubble solution matrix  404  on the right side of the treatment tank  602 . Thus, the bubbles may primarily rise on the right side, and a hood  604  may be provided on the right side of the treatment tank  602  to capture and direct the gas from the microbubbles and nanobubbles caused to rise and outgas from the microbubble mixture into another tank or into a filter that may remove unwanted gasses such as ozone gas, for example. Other implementations are also possible. 
     In the illustrated example, it should be appreciated that nanobubble nozzles  606  may be provided on the sides of the treatment tank  602 , including near a top portion of the treatment tank  602  (albeit below a top surface of the treatment solution). The microbubble nozzles  608  may be positioned at or near the bottom of the treatment tank  602  to take advantage of the buoyancy-induced movement of the microbubbles within the treatment solution. 
     In some implementations, the microbubble nozzles  608  and the nanobubble nozzles  606  may be electrically and independently controllable to open, close, adjust the streams, adjust spray directions, or any combination thereof. An example of an electrically controllable nozzle  606  or  608  is described below with respect to  FIG. 6B . 
       FIG. 6B  depicts a block diagram  620  of a nozzle  606  or  608  of the treatment tank system  600  of  FIG. 6A . In this example, each nozzle  606  or  608  may include a solution matrix inlet  622  to receive a solution matrix (microbubble, nanobubble, dissolved gas, or any combination thereof). The nozzle  606  or  608  may further include an actuator  624  communicatively coupled to a control system  114 . The actuator  624  may be coupled to a valve  626  and to a spray tip  628 . The actuator  624  may open and close the valve  626  to provide a selected flow of the solution matrix from the solution matrix inlet  622  to the spray tip  628  in response to signals from the control system  114 . The actuator  624  may be coupled to the spray tip  628  and may be configured to control the stream and the direction of the stream by selectively controlling the spray tip  628  in response to signals from the control system  144 . 
     In some implementations, each nozzle  606  or  608  may be controlled independently of other nozzles  606  or  608  such that the treatment tank  602  may have multiple different streams and stream directions within the tank. In one implementation, the directions of the streams may be arranged to create a selected circulation of treatment fluid within the treatment tank  602 . In another implementation, the directions of the streams may be arranged to create and manage turbulence within the treatment solution. Other implementations are also possible. 
       FIGS. 7A-7B  depict block diagrams of a treatment tank  602  with nanobubble nozzles  606  configured to direct a nanobubble solution matrix at different angles within the treatment tank  602 , in accordance with certain embodiments of the present disclosure. In  FIG. 7A , the treatment tank  602  is shown from a top view  700 . The microbubble nozzles  608  are positioned toward a right side of the treatment tank  602  along the tank bottom  614 . In this example, the nanobubble nozzles  606  are positioned along a first side  612 ( 1 ), a second side  612 ( 2 ), and a fourth side  612 ( 4 ). In this example, the third side  612 ( 3 ) does not include nanobubble nozzles  606 . 
     In this example, the nanobubble nozzles  606  may be controlled to direct the second solution matrix of nanobubbles to form a current or direction of flow of the treatment solution within the treatment tank  602 . As discussed above, the flow volume, the pressure, the direction, and other parameters of the nanobubble nozzles  606  may be controlled to provide a selected current and selected treatment solution. Other implementations are also possible. 
     In  FIG. 7B , a second view  720  of the treatment tank  602  may include the nanobubble nozzles  606  having different fluid flow directions as compared to the embodiment depicted in  FIG. 7A . It should be appreciated that the control system  114  or the control circuit  202  may be configured to control the nanobubble nozzles  606  to provide a selected fluid flow, selected spray, selected directions, and so on. Other implementations are also possible. 
       FIG. 8  depicts a block diagram  800  of a control system  802  for use with the systems of  FIGS. 1-7 , in accordance with certain embodiments of the present disclosure. The control system  802  may be an embodiment of the control system  114  of  FIG. 1  or the control circuit  202  of  FIG. 2 . The control system  802  may be implemented as a computing device or may be implemented as a programmable circuit device. 
     The control system  802  may include one or more power supplies  804 , such as batteries, transformers for managing current and voltage from a wall socket, another power supply, or any combination thereof. The one or more power supplies  804  may deliver operating power to the various components of the control system  802 . 
     The control system  802  may further include one or more processors  806 , which may be configured to execute processor-readable instructions. The control system  802  may also include one or more clocks  808  to provide timing signals, which may be used by the one or more processors  806  or by various components to facilitate operations, synchronization, and so on. 
     The control system  802  may include one or more communication interfaces  810 . The communication interfaces  810  may include one or more network interfaces  812  to communicate data to and receive data from a network  116 . The network interfaces  812  may include connection interfaces to receive network cables, wireless transceivers to facilitate radio frequency communications, and so on. 
     The communication interfaces  810  may also include one or more input/output (I/O) interfaces  814 . The I/O interfaces  814  may be configured to couple to one or more input/output devices  816 , one or more sensors  818 , and one or more valve actuators  820 . The input/output devices  816  may include input devices including a touch-sensitive interface, a keypad, a pointer device, a microphone, a camera, a scanner, another input device, or any combination thereof. The input/output devices  816  may also include output devices such as a display, a speaker, a printer, a haptic feedback device, another output device, or any combination thereof. In some implementations, the input/output devices  816  may include a combination of an output display device and an input touch-sensitive interface (such as a touchscreen). 
     The sensors  818  may include temperature sensors, microbubble detection sensors, nanobubble detection sensors, flow rate sensors, chemical composition sensors, water quality measurements and so on. Each sensor  818  may generate an electrical signal that is proportional to a measured parameter. 
     The valve actuators  820  may be coupled to the I/O interfaces  814  to receive a signal. The valve actuators  820  may be responsive to signals from the I/O interfaces  814  to open and close, adjusting the flow of fluid or gas within the system. 
     The control system  802  may include one or more memories  822 , which may include hard disc drives, solid-state drives, cache memory, random access memory (RAM), read only memory (ROM), other memory devices, or any combination thereof. The memory  822  may store processor-readable instructions and data. 
     The memory  822  may include one or more operating system (OS) modules  824 , which may be executed by the processors  806  to control operation of the control system  802 . The memory  822  may include one or more communication modules  826  that, when executed, may cause the processor  806  to control operation of the communication interfaces  810 . 
     The memory  822  may include one or more gas selection modules  828  that, when executed, may cause the processors  806  to determine a type of treatment, such as cleaning, ripening, etc. For example, some chemical compositions or gas concentrations may have better efficiency at killing bacteria in high organic load water than others. The gas selection modules  828  may cause the processor  806  to determine the type of contaminant to be cleaned and may select a gas suitable for the determined contaminant. In another example, some chemical compositions may facilitate organic growth or ripening, and the gas selection module  828  may cause the processor  806  to determine a gas corresponding to growth or ripening, such as nitrogen or ethylene. 
     The memory  822  may include an analytics module  830  that, when executed, may cause the processor  806  to determine one or more chemical compositions, one or more solution components (such as dissolved gas(es), microbubbles, nanobubbles, or any combination thereof). The analytics module  830  may cause the processor  806  to determine the ratio of nanobubbles to microbubbles, the ratio of selected gases, decay rates of the solution with respect to nanobubbles and microbubbles, and so on, depending on the selected application. 
     The memory  822  may also include an alerting module  832  that, when executed, may cause the processors  806  to send an alert to a computing device  118  or to an output device of the I/O devices  816 . The alert may include text, images, audio data, video data, other data, or any combination thereof. In some implementations, the alerting module  832  may cause the processor  806  to send a message including information to an operator to facilitate decision-making, parameter adjustments, and so on. In an example, the alerting module  832  may cause the processor  806  to send an interface including data and including one or more control options accessible by a user to adjust one or more parameters or to configure operation of the overall system. Other implementations are also possible. 
     The memory  822  may also include a data store  834 . The data store  834  may include contaminant data  836 , which may include information about which gases and which types of bubbles may impact selected contaminants. The data store  834  may also include object data  838 , such as product information, item information, and so on. In an example, the object data  838  may include information about lettuce or some other item to be cleaned. 
     The memory  822  may also include cleaning data  840 . The cleaning data  840  may include information about cleaning of objects  110 . Further, the cleaning data  840  may include information about selected mixes of microbubbles, nanobubbles, dissolved gas, and so on, as well as the selected gases. In some implementations, the cleaning data  840  may include product lot information correlated to timing information. The cleaning data  840  may also include treatment solution data (ratios, chemicals, and so on). In some implementations, the cleaning data  840  may be used to determine cleaning information associated with a particular lot. Other implementations are also possible. 
     The data store  834  may include measurement data  842  that may have been captured by the one or more sensors  818  and stored with a time stamp. The data store  834  may also include other data  844 . 
     The production and mixture of microbubbles and nanobubbles can be regulated by the control system  802 , based on input data determined by the one or more sensors  818 , which may be embodiments of the sensors  112 . The sensors  818  may be distributed across one or more components of the system 
     The control system  802  may include a plurality of closed-loop control routines that allow, for example, setpoint targets to be determined and maintained at selected levels while counteracting disturbances. For example, variations in ambient temperature, feedstock or organic load may disturb the control loop but the control system  802  may automatically adjust operation based on the parameters determined by the sensors and based on such disturbances. The control system  802  may be tuned manually or automatically, depending on the implementation. 
     In some implementations, the control system  802  may direct flow-through microbubble and nanobubble circulation through the circulation loop  334  by controlling one or more of a plurality of valves to isolate or engage various components of the circulation loop  324  as needed. 
     The sensors  818  (and/or sensors  112 ) may measure physical properties, such as temperatures, volumetric flows, mass flows, pressures, gas content, organic load, bubble size, bubble density, other parameters, or any combination thereof. In some implementations, the sensors  818  (and/or sensors  112 ) may supply pre-processed data to the analytics module  830  to enable, among other things, the continuous control of various pathogen cleaning options of the circulation loop  324 , such as ratio of microbubble to nanobubble content. Sensors  818  and/or  112  may be incorporated throughout the circulation loop  324  to provide the analytics modules  830  with data. Such sensing instrumentation may include, without limitation, continuous measurement and/or sequential or time-based sampling sub-systems. Data pre-processing may include, without limitation, normalization, characterization, and correction of measured values, such as electrical current, for environmental factors, such as pH level. Other implementations are also possible. 
       FIG. 9  depicts a flow diagram of a method  900  of removing contaminants from a selected object, in accordance with certain embodiments of the present disclosure. At  902 , the method  900  may include determining one or more treatment types. The one or more treatment types may be based on a type of product, a selected outcome, other information, or any combination thereof. For example, particulates or contaminants may be different for a produce item, such as fruit or vegetables, as compared to a silicon circuit wafer, and the treatment type may be selected to kill bacteria, yeast, or mold, or to remove pathogens. In another example, the treatment type may be selected to apply or remove a coating to a product, to apply one or more chemicals to extend the shelf life of the product, and so on. The treatment options may include cleaning, ripening, extending shelf-life, applying coatings, or any combination thereof. Other implementations are also possible. 
     At  904 , the method  900  may include determining one or more gas compositions for the one or more treatments. The gas compositions may include determination of the ratio of nanobubbles to microbubbles as well as the chemical composition. In other implementations, the one or more gas compositions may include a first gas, a second gas, and so on. Other implementations are also possible. 
     At  906 , the method  900  may include controlling a gas handling subsystem to produce a plurality of bubbles (microbubbles, nanobubbles, or both) formed of the selected gas compositions. In one example, the gas handling subsystem may produce microbubbles formed from a first chemical composition and nanobubbles formed from a second chemical composition. In another example, the gas handling system may produce a ratio of nanobubbles to microbubbles formed of a selected chemical composition. In yet another example, the gas handling system may produce a first ratio of nanobubbles to microbubbles of a first chemical composition and a second ratio of nanobubbles to microbubbles of a second chemical composition. Other implementations are also possible. 
     At  908 , the method  900  may include controlling one or more valves to deliver bubbles (microbubbles, nanobubbles, or both) formed of the selected gas compositions to a treatment tank  102 . In this example, the bubbles may be delivered as part of a solution via nozzles  340 ,  406 , or  408  (spray nozzles, submerged nozzles, or both) to apply the bubble solution to an object  110 , such as a product. Alternatively, the nozzles may spray one or more solution matrices including the microbubbles, the nanobubbles, or both may be applied directly to the products. Other implementations are also possible. 
     At  910 , the method  900  may include monitoring one or more parameters of the treatment tank. The parameters may be monitored using one or more sensors  718  or  112 . In another implementation, the parameters may be monitored based on the elapsing of a predetermined period of time. For example, if a product is to be immersed in the treatment solution  104  for a predetermined time period in order to kill bacteria, the control system  702  may monitor a time parameter to determine when the treatment operation is complete. In other implementations, chemical concentrations may be monitored using sensors. In still other implementations, the sensors may monitor flow volume of each of the nozzles, flow volume of each solution matrix, temperature of each solution matrix and of the treatment solution, other parameters, and so on. Other implementations are also possible. 
     At  912 , the method  900  may include recording data corresponding to one or more of the treatment type, the one or more parameters, or the product information. The recorded data may be correlated to time and date information and to products treated by the system. Other implementations are also possible. 
     It should be appreciated that some treatment processes may be batch processes, while other treatment processes may be continuous. Other implementations are also possible. 
     In conjunction with the systems and methods described above with respect to  FIGS. 1-8 , a system may include a circulation subsystem and a circuit coupled to the circulation subsystem. The circuit may provide one or more signals to control the circulation subsystem to circulate a treatment solution including one or more of microbubbles or nanobubbles in a selected ratio. In one aspect, the nanobubbles may include a first gas, and the microbubbles may include a second gas. In another aspect, the treatment solution may include a first percentage of nanobubbles and a second percentage of microbubbles. 
     In some embodiments, a system includes a gas handling subsystem, a microbubble and nanobubble generator, a nanobubble isolation system, and a circuit. The gas handling subsystem may provide one or more gases. The microbubble and nanobubble generator may infuse a liquid with the one or more gases to produce a solution. The nanobubble isolation system may produce a first solution including predominately microbubbles and a second solution including predominately nanobubbles. The circuit may be coupled to the nanobubble isolation system and may provide one or more signals to control the nanobubble isolation system to produce a treatment solution including a first amount of the first solution and a second amount of the second solution. The treatment solution may include a first percentage of microbubbles and a second percentage of nanobubbles. 
     Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the scope of the invention.