Abstract:
The present invention provides a ballast water treatment system, comprising a centrifugal separator, an ultrasonic sterilizer, and an ultraviolet sterilizer, wherein, the centrifugal separator is designed to separate large-particle of foreign matters from the ballast water by centrifugal separation by means of density difference; the ultrasonic sterilizer is arranged at the back of the centrifugal separator, and is designed to accomplish ultrasonic sterilization for the ballast water passing through the centrifugal separator; the ultrasonic sterilizer comprises a pipe that is used for sterilization of the ballast water and ultrasonic irradiation unit that perform ultrasonic irradiation for the ballast water passing through the pipe; the ultraviolet sterilizer accomplishes sterilization by means of ultraviolet irradiation for the ballast water passing through the ultrasonic sterilizer. The ballast water treatment system provided in the present invention can effectively accomplish sterilization for the ballast water that flows into the ballast tank of ship, and thereby prevent all kinds of pollution to seawater related with ballast water discharge, and greatly improve reliability of application.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a water treatment system, in particular to a ballast water treatment system. 
       BACKGROUND OF THE INVENTION 
       [0002]    For large ships, in order to keep its balance during sailing, appropriate volume of seawater needs to be stored in the ballast tank at the bottom of the ship. The seawater or fresh water stored in the ballast tank for keeping balance of ship is known as ballast water. 
         [0003]    Usually, ballast water is stored in the ballast tank near the port of departure, and after a voyage discharged from the ballast tank in the offshore area near the port of destination. 
         [0004]    However, the ballast water charged into the ballast tank of the ship in the offshore area near the port of departure contains a variety of microbes that live in the offshore area or silt, and therefore the ballast water will pollute the offshore environment near the port of destination when it is discharged. 
         [0005]    To solve the problem, a treaty for regulation and management of ship ballast water and sediments (hereinafter referred as “Treaty for Ballast Water”) is adopted, and it specifies the discharge standard of ballast water. Ballast water is prohibited to discharge if the discharge standard is not met. 
         [0006]    To meet the ballast water discharge standard, a variety of proposals for installation of ballast water treatment system in ship are put forth. The Korean Patent Application No. 10-0743946, titled as “Apparatus for Purifying Ballast Water and Ship Mounted the Same”, describes a method, wherein the ballast water stored in the tank is treated with a filtering apparatus during storage, and the ballast water is sterilized with a sterilizing apparatus before it is discharged, which is to say, large-particle materials are filtered off with the filtering apparatus, and then a variety of planktonic organisms or microbes are sterilized under UV irradiation with the sterilizing equipment. 
         [0007]    The present ballast water treatment systems mounted inside ships are not highly reliable, and their sterilization and purification effects are not ideal. Therefore, the ballast water still brings pollution to the offshore environment of the port of destination. 
       SUMMARY OF THE INVENTION 
       [0008]    To overcome the drawbacks of the prior art, the object of the present invention is to provide a ballast water treatment system, which has high reliability and can effectively accomplish sterilization of the ballast water that flows into the ship, and thereby can prevent pollution resulting from discharge of ballast water. 
         [0009]    To solve the above problem, the ballast water treatment system provided in the present invention comprises a centrifugal separator, an ultrasonic sterilizer, and an ultraviolet sterilizer, wherein: 
         [0010]    the centrifugal separator is designed to separate large particle of foreign matters in the ballast water by centrifugal separation by means of density difference; 
         [0011]    the ultrasonic sterilizer is arranged at the back of the centrifugal separator, and is designed to accomplish ultrasonic sterilization for the ballast water in the centrifugal separator; 
         [0012]    the ultrasonic sterilizer comprises a pipe that is used for sterilization of the ballast water and ultrasonic irradiation unit that perform ultrasonic irradiation for the ballast water in the pipe; 
         [0013]    the ultraviolet sterilizer is designed to accomplish sterilization of the ballast water in the ultrasonic sterilizer by means of ultraviolet irradiation. 
         [0014]    Wherein, the ultrasonic irradiation unit comprises: an ultrasonic vibrator that generates ultrasonic vibration and a vibrating plate that is mounted at the fore-end of the ultrasonic vibrator and is designed to transfer the ultrasonic wave generated by the ultrasonic vibrator to the ballast water in the pipe. 
         [0015]    Wherein, a plurality of vibrating plates are aligned along the length direction of the pipe for sterilization, and are mounted along the circumference of the pipe for sterilization, and each vibrating plate comprises a plurality of ultrasonic vibrators in the length direction of the vibrating plate. 
         [0016]    Wherein, the ultrasonic vibrator comprises high-frequency vibrators and low-frequency vibrators, which are mounted alternately in the length direction of the vibrating plate. 
         [0017]    Wherein, in order to transfer ultrasonic wave in the pipe for sterilization, a roll shape metal mesh which is tangent to the vibrating plate is mounted in the pipe for sterilization. 
         [0018]    Wherein, an acoustic material is mounted at the inside of the ultrasonic sterilizer, and a protective cover that envelops the ultrasonic vibrators is mounted at the outside of the pipe for sterilization. 
         [0019]    Wherein, the diameter of the discharge pipe of the centrifugal separator increases gradually, and the flow velocity of fluid increases, thereby the centrifugal force increases. 
         [0020]    Wherein, a protective cover for the ultrasonic irradiation unit is mounted on the ultrasonic sterilizer. 
         [0021]    Wherein, the ultraviolet sterilizing equipment is further equipped with an explosion-proof cover plate. 
         [0022]    As described above, in the present invention, with a resonable combination of centrifugal separator, ultrasonic sterilizer, and ultraviolet sterilizer, the ballast water in the ship can be sterilized effectively, so as to prevent a variety of sea pollution related with discharge of ballast water. Therefore, the ballast water treatment system provided in the present invention has high reliability. 
     
    
     
       DESCRIPTION OF DRAWINGS 
         [0023]      FIG. 1A  and  FIG. 1B  are system diagrams of embodiment 1 of the ballast water treatment system provided in the present invention; 
           [0024]      FIG. 2  is a flow diagram of fluid when ballast water flows into the ballast tank on the basis of  FIG. 1A  and  FIG. 1B ; 
           [0025]      FIG. 3  is a flow diagram of fluid when ballast water discharges on the basis of  FIG. 1A  and  FIG. 1B ; 
           [0026]      FIG. 4A  and  FIG. 4B  are 3D diagrams of main components of the ballast treatment system shown in  FIG. 1A  and  FIG. 1B ; 
           [0027]      FIG. 5A  and  FIG. 5B  are front views of  FIG. 4A  and  FIG. 4B ; 
           [0028]      FIG. 6  is a 3D diagram of the centrifugal separator shown in  FIG. 4A  and  FIG. 4B ; 
           [0029]      FIG. 7  is a schematic diagram of operation of  FIG. 6 ; 
           [0030]      FIG. 8  is a 3D schematic diagram of structure  1  of the ultrasonic sterilizer shown in  FIG. 4A  and  FIG. 4B ; 
           [0031]      FIG. 9A  and  FIG. 9B  are longitudinal section views of  FIG. 8 ; 
           [0032]      FIG. 10  is a plan view of  FIG. 8 ; 
           [0033]      FIG. 11A  and  FIG. 11B  are 3D diagrams of  FIG. 8 , with the protective cover removed; 
           [0034]      FIG. 12  is a 3D schematic diagram of structure  2  of the ultrasonic sterilizer shown in  FIG. 4A  and  FIG. 4B ; 
           [0035]      FIG. 13A  and  FIG. 13B  are front views of the ultraviolet sterilizer shown in  FIG. 4A  and  FIG. 4B ; 
           [0036]      FIG. 14  shows the metal mesh arranged in the ultrasonic sterilizer for more efficiently transferring ultrasonic wave; 
           [0037]      FIG. 15  is a system diagram of embodiment 2 of the ballast water treatment system provided in the present invention; 
           [0038]      FIG. 16  is a front view of the ultraviolet sterilizer shown in  FIG. 15 ; 
           [0039]      FIG. 17  is a longitudinal section view of the explosion-proof ultrasonic sterilizer; 
           [0040]      FIG. 18  is a front view of the explosion-proof ultrasonic sterilizer. 
       
    
    
       [0041]      
         [0000]    
       
         
               
             
               
               
               
               
             
           
               
                   
               
               
                 &lt;Description of the Symbols&gt; 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 10 
                 Water Pump 
                 20 
                 Ballast Tank 
               
               
                 100 
                 Centrifugal 
                 200 
                 Ultrasonic Sterilizer 
               
               
                   
                 Separator 
               
               
                 210 
                 Pipe for 
                 220 
                 Ultrasonic Irradiation 
               
               
                   
                 Sterilization 
                   
                 Unit 
               
               
                 221 
                 Ultrasonic 
                 222 
                 Vibrating Plate 
               
               
                   
                 Vibrator 
               
               
                 230 
                 Protective Cover 
                 231 
                 Acoustic Material 
               
               
                 240 
                 Metal Mesh 
                 241~246 
                 Upper Vibrating Plate 
               
               
                 251, 252, 256 
                 Lower Vibrating 
                 261 
                 Explosion-Proof 
               
               
                   
                 Plate 
                   
                 Protective Cover for 
               
               
                   
                   
                   
                 Ultrasonic Vibrator 
               
               
                 300 
                 Ultraviolet 
               
               
                   
                 Sterilizer 
               
               
                   
               
             
          
         
       
     
       DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0042]    For those skilled in the art to implement the present invention, hereunder the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be appreciated that the present invention can be implemented in different forms, and not limited to the embodiments described here. In addition, for the clear illustration on the drawings, parts that are unnecessary for description are omitted, and same drawing symbols refer to similar parts throughout the whole specification. 
         [0043]    While the present invention is described in detail with reference to some embodiments, those embodiments are not intended to limit the present invention. Those skilled in the art can make modifications to the technical scheme described in the embodiments, or make equivalent replacements to some technical features of the embodiments. However, any modification, equivalent replacement, or improvement to the embodiments without departing from the spirit and principle of the present invention shall be deemed as falling into the protected scope of the present invention. 
         [0044]    To make the composition of the ballast water treatment system more effective, the ultrasonic sterilizer and ultraviolet sterilizer, which are components of the ballast water treatment system, are constituted with two models in the specification of the present invention. 
       Embodiment 1 
       [0045]      FIG. 1A  and  FIG. 1B  are system diagrams of embodiment 1 of the ballast water treatment system provided in the present invention. As shown in  FIG. 1A  and  FIG. 1B , the ballast water treatment system comprises: a water pump ( 10 ), a ballast tank ( 20 ), a centrifugal separator ( 100 ), an ultrasonic sterilizer ( 200 ), and an ultraviolet sterilizer ( 300 ). 
         [0046]      FIG. 2  is a flow diagram of fluid when ballast water flow into the ballast tank on the basis of  FIG. 1A  and  FIG. 1B . As shown in  FIG. 2 , the process of charging ballast water into the ballast tank ( 20 ) is as follows: the ballast water flows into the ballast tank ( 20 ) through the water pump ( 10 ), centrifugal separator ( 100 ), ultrasonic sterilizer ( 200 ), and ultraviolet sterilizer ( 300 ). 
         [0047]      FIG. 3  is a flow diagram of fluid when ballast water discharges on the basis of  FIG. 1A  and  FIG. 1B . As shown in  FIG. 3 , the process of discharging ballast water from the ballast tank ( 20 ) is as follows: the ballast water is discharged to the outside from the ballast tank ( 20 ) through the water pump ( 10 ), ultrasonic sterilizer ( 200 ), and ultraviolet sterilizer ( 300 ). 
         [0048]    In the ballast water treatment system provided in the present invention, the ballast water flows through the centrifugal separator ( 100 ) when it is ballasted, but it doesn&#39;t flows through the centrifugal separator ( 100 ) when it is discharged, since it has been treated by centrifugal separation. 
         [0049]      FIG. 4A  and  FIG. 4B  are 3D diagrams of main components of  FIG. 1A  and  FIG. 1B ;  FIG. 5A  and  FIG. 5B  are front views of  FIG. 4A  and  FIG. 4B . As shown in  FIG. 4A ,  FIG. 4B ,  FIG. 5A , and  FIG. 5B , the main structure of the system is a structure in which the centrifugal separator ( 100 ), ultrasonic sterilizer ( 200 ), and ultraviolet sterilizer ( 300 ) are arranged sequentially in the flow direction of fluid as shown in  FIG. 4A ,  FIG. 4B ,  FIG. 5A , and  FIG. 5B . 
         [0050]      FIG. 6  is a 3D diagram of the centrifugal separator shown in  FIG. 4A  and  FIG. 4B . As shown in  FIG. 6 , the centrifugal separator ( 100 ) in this embodiment is a cyclone centrifugal separator. 
         [0051]    The centrifugal separator ( 100 ) is designed to separate large-particle of foreign matters from the ballast water by centrifugal separation by means of density difference, when the ballast water flows into the ballast tank. 
         [0052]    That is to say, when the ballast water flows into the ballast tank through the centrifugal separator ( 100 ), it rotates in the centrifugal separator ( 100 ) and therefore centrifugal force is generated in the rotating water; as a result, high-density particles gather at the conical inner wall and are discharged to the outside through the cone vertex. After the high-density particles are separated, the ballast water flows out from the top of the centrifugal separator ( 100 ), and then flows into the next process, i.e., ultrasonic sterilizer ( 200 ). 
         [0053]      FIG. 7  is a schematic diagram of operation of  FIG. 6 . As shown in  FIG. 7 , the diameter (D 1 , D 2 ) of the discharge pipe ( 110 ) is enlarged from D 1  to D 2  gradually, so that the ballast water rotating inside flows faster. That design is to increase the centrifugal force of ballast water (center distance×square of flow velocity) at the inlet caliber (D 2 ) of the discharge pipe ( 110 ), so as to improve the efficiency of centrifugal separator. 
         [0054]    The centrifugal separator ( 100 ) is connected to the ultrasonic sterilizer ( 200 ) at the backend. 
         [0055]    The ultrasonic sterilizer ( 200 ) is provided to carry out ultrasonic sterilization for the ballast water through the centrifugal separator ( 100 ). 
         [0056]    Ultrasonic wave is sound in a frequency range beyond the hearing range of human being, and carries very powerful energy. Ultrasonic wave is transferred to liquids in the form of dilatational wave, and thereby generates a strong cavitation effect in the liquids. 
         [0057]    Such ultrasonic wave is usually used for washing or cleaning. For example, the ultrasonic wave can be used in ultrasonic equipment for medical diagnosis, for ultrasonic cleaning of optical glasses, for cleaning of automotive parts, and for cleaning of ceramic, etc. (ultrasonic washing machine, ultrasonic disintegrator, cleaning of dental medical equipment, and cleaning of noble metals, etc.) 
         [0058]    In addition to above contents, the sterilizing effect of ultrasonic irradiation in liquid has been proved in many literatures. However, since ultrasonic irradiation will generate very big noise, it is not widely used in industrial field for sterilization purpose yet. 
         [0059]    In the ballast water treatment system of present invention, the ultrasonic sterilizer ( 200 ) is arranged at the fore end of the ultraviolet sterilizer ( 300 ), to kill planktonic organisms or microbes by means of the perfect combination of ultrasonic sterilizer ( 200 ) and ultraviolet sterilizer ( 300 ), to ensure the treated ballast water comply with the discharge standard of ballast water. 
         [0060]    Especially, even though planktonic organisms or microbes are not completely killed in the ultrasonic sterilizer ( 200 ), they are damaged severely in ultrasonic vibration, and then will be killed completely when they pass through the ultraviolet sterilizer ( 300 ). 
         [0061]      FIG. 8  is a 3D schematic diagram of structure  1  of the ultrasonic sterilizer shown in  FIG. 4A  and  FIG. 4B . As shown in  FIG. 8 , a protective cover ( 230 ) is arranged outside of the pipe for sterilization ( 210 ) of the ultrasonic sterilizer ( 200 ). 
         [0062]      FIG. 9A  and  FIG. 9B  are longitudinal section views of  FIG. 8 . As shown in  FIG. 9A  and  FIG. 9B , the ultrasonic sterilizer further comprises ultrasonic vibrators ( 221 ) and an acoustic material ( 231 ). 
         [0063]      FIG. 10  is a plan view of  FIG. 8 ;  FIG. 11A  and  FIG. 11B  are 3D views of  FIG. 8 , with the protective cover removed. As shown in  FIG. 10 ,  FIG. 11A , and  FIG. 11B , the ultrasonic sterilizer further comprises vibrating plate ( 222 ). The ultrasonic vibrator ( 221 ) and vibrating plate ( 222 ) form ultrasonic irradiation unit ( 220 ). 
         [0064]    The ultrasonic sterilizer ( 200 ) comprises pipe for sterilization ( 210 ), ultrasonic irradiation unit ( 220 ), and protective cover ( 230 ). 
         [0065]    The pipe for sterilization ( 210 ) is a tubular part, through which the ballast water can flow. 
         [0066]    The pipe for sterilization ( 210 ) is equipped with flanges at both ends for pipe connection. 
         [0067]    The pipe for sterilization ( 210 ) has a plurality of ultrasonic irradiation unit ( 220 ) mounted on the surface. 
         [0068]    The ultrasonic irradiation unit ( 220 ) irradiates ultrasonic wave into the ballast water flowing through the pipe for sterilization ( 210 ). 
         [0069]    The ultrasonic irradiation unit ( 220 ) comprises an ultrasonic vibrator ( 221 ) that generates ultrasonic vibration and a vibrating plate ( 222 ) that is arranged ahead of the ultrasonic vibrator ( 221 ) and tangent to the ballast water to transfer the ultrasonic wave generated by the ultrasonic vibrator into the ballast water. 
         [0070]    The ultrasonic vibrator ( 221 ) converts electric energy into mechanical energy to generate ultrasonic vibration. A variety of forms of ultrasonic vibrators are standardised. 
         [0071]    In this embodiment, the vibrating plates ( 222 ) are aligned along the length direction of the pipe for sterilization ( 210 ) and tangent to the flow direction of ballast water. 
         [0072]    In addition, a plurality of vibrating plates ( 222 ) are aligned along the pipe for sterilization ( 210 ) on the surface. In this embodiment, 6 vibrating plates ( 222 ) are aligned at an even interval with gap. 
         [0073]    In addition, a plurality of ultrasonic vibrators ( 221 ) are arranged in the length direction of each vibrating plate ( 222 ). 
         [0074]      FIG. 12  is a 3D schematic diagram of structure  2  of the ultrasonic sterilizer shown in  FIG. 4A  and  FIG. 4B . As shown in  FIG. 12 , in order to improve the sterilizing effect of the ultrasonic sterilizer, upper vibrating plates ( 241 ,  242 ,  243 ,  244 ,  245 ,  246 ) and lower vibrating plates ( 251 ,  252 ,  256 ) are provided on the ultrasonic sterilizer. By adjusting the frequencies of ultrasonic vibrators fixed to the upper vibrating plates ( 241 ,  242 ,  243 ,  244 ,  245 ,  246 ) and lower vibrating plates ( 251 ,  252 ,  256 ), the cavitation effect in the liquid can be enhanced. 
         [0075]    For example, 40 kHz high-frequency ultrasonic wave is generated by the 3 upper vibrating plates ( 241 ,  243 ,  245 ) and 3 lower vibrating plates ( 252 ,  254 ,  256 ), and 28 kHz lower-frequency ultrasonic wave is generated by the other 3 upper vibrating plates ( 242 ,  244 ,  246 ) and 3 lower vibrating plates ( 251 ,  253 ,  255 ), so that the high-frequency ultrasonic wave and low-frequency ultrasonic wave interact with each other in the liquid, resulting in stronger cavitation effect. 
         [0076]    That is because: high-frequency ultrasonic wave has high degree of linearity and therefore can transfer wavelength intensely into liquid; low-frequency ultrasonic wave can transfer wavelength more intensely, though it has lower linearity compared with high-frequency ultrasonic wave. With that feature, ultrasonic waves with different frequencies can interact with each other in the liquid. 
         [0077]    Whereas the ultrasonic sterilizer ( 200 ) generates very high noise due to ultrasonic vibration, therefore, the ultrasonic vibrator ( 221 ) must have exterior protection. 
         [0078]    To that end, a protective cover ( 230 ) is arranged outside of the pipe for sterilization ( 210 ). 
         [0079]    The protective cover ( 230 ) has acoustic material ( 231 ) inside. The protective cover ( 230 ) envelops the ultrasonic vibrator ( 221 ) and is arranged outside of the pipe for sterilization ( 210 ), so as to reduce noise and protect the ultrasonic vibrator ( 221 ) from outside. 
         [0080]      FIG. 13A  and  FIG. 13B  are front views of the ultraviolet sterilizer shown in  FIG. 4A  and  FIG. 4B . As shown in  FIG. 13A  and  FIG. 13B , the ultraviolet sterilizer ( 300 ) is connected to the back end of the ultrasonic sterilizer ( 200 ). The ultraviolet sterilizer ( 300 ) is designed to kill planktonic organisms and microbes in the ballast water passing through the ultrasonic sterilizer by means of ultraviolet irradiation. 
         [0081]    To achieve that purpose, the ultraviolet sterilizer ( 300 ) is equipped with ultraviolet lamp. 
         [0082]    Since the ultraviolet sterilizer ( 300 ) is well known in the art, it will not be described further here. 
         [0083]      FIG. 14  shows a metal mesh arranged to enable the ultrasonic sterilizer to transfer ultrasonic wave more effectively. As shown in  FIG. 14 , the metal mesh ( 240 ) arranged to enable the ultrasonic sterilizer to transfer ultrasonic wave more effectively is rolled into circular shape, and arranged inside of the pipe for sterilization ( 210 ) such that the outside of circular metal mesh ( 240 ) is tangent to the vibrating plate ( 222 ). 
         [0084]    Thus, the ultrasonic vibration from the vibrating plate ( 222 ) can be transferred not only into the ballast water but also to the center of the pipe for sterilization ( 210 ) effectively via the metal mesh ( 240 ). 
         [0085]    Since the metal mesh ( 240 ) is a net, it will not hinder the flow of ballast water. 
       Embodiment 2 
       [0086]      FIG. 15  is a system diagram of the ballast water treatment system in embodiment 2 of the present invention;  FIG. 16  is a front view of the ultraviolet sterilizer shown in  FIG. 15 . As shown in  FIG. 16  and  FIG. 15 , the structure of the ballast water treatment system provided in the present invention is such a structure, wherein, the ballast water flows into the ultraviolet sterilizer ( 300 ) from top, treated with ultraviolet irradiation, and then discharged from the top of ultraviolet sterilizer ( 300 ). 
         [0087]    The system in the present invention can be designed into a structure suitable for installation at hazardous area of ships, and is an explosion-proof component. 
         [0088]      FIG. 17  is a conceptual longitudinal section view of the explosion-proof ultrasonic sterilizer, which is equipped with an explosion-proof protective cover ( 261 ) for the purpose of explosion protection. 
         [0089]      FIG. 18  shows oblique view and side view of the explosion-proof ultraviolet sterilizing equipment, which is equipped with an explosion-proof cover plate ( 310 ) for the purpose of explosion-proof. 
         [0090]    While the above description of present invention is only for illustration, those skilled in the art can be change the above structure into other structures easily, without departing from the spirit or essential features of the present invention. Therefore, it should be understood that all the embodiments described above are illustrative but not limitative. For example, each component described collectively can be implemented separately; likewise, components described separately can be implemented in combination. 
         [0091]    The protection scope of the present invention should be only confined by the claims, instead of above detailed description; all modifications or deformations of the embodiments are within the protection scope of the present invention. 
       Test Result 
       [0092]    A land-based test is carried out for the ballast water treatment system provided in the present invention, according to the Guideline for Approval of Ballast Water Management System (G8) issued by the International Maritime Organization (IMO). The test result is shown in Table 1. 
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                   
                   
                 Treated 
                   
                   
               
               
                   
                   
                   
                 Water 
               
               
                   
                 Influent 
                 Control 
                 (this 
                 IMO 
                 California 
               
               
                   
                 water 
                 Water 
                 Invention) 
                 Standard 
                 Standard 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                 High Salinity 
                   
                   
                   
                   
                   
               
               
                 (Average 32.8 PSU) 
               
               
                   Vibrio cholerae  [cfu/100 mL] 
                 5.9+E6 
                 6.7+E5 
                 0 
                 &lt;1 
                 &lt;1 
               
               
                   Escherichia coli  [cfu/100 mL] 
                  1.85+E4 
                 3.0+E3 
                 4 
                 &lt;250 
                 &lt;126 
               
               
                   Enterococcus  [cfu/100 mL] 
                 1.0+E3 
                 1.0+E3 
                 0.6 
                 &lt;100 
                 &lt;33 
               
               
                 Planktonic organisms 
                 5,780 
                 1,510 
                 0 
                 &lt;10 
                 &lt;0.01 
               
               
                 10-50 μM [counts/mL] 
               
               
                 Planktonic organisms &gt;50 μm 
                  4.66+E5 
                  2.25+E4 
                 0 
                 &lt;10 
                 0 
               
               
                 [counts/m 3 ] 
               
               
                 Low Salinity 
               
               
                 (Average 17.2 PSU) 
               
               
                   Vibrio cholerae  [cfu/100 mL] 
                 9.3+E5 
                 1.1+E6 
                 0 
                 &lt;1 
                 &lt;1 
               
               
                   Escherichia coli  [cfu/100 mL] 
                 9.0+E3 
                 1.3+E3 
                 4.8 
                 &lt;250 
                 &lt;126 
               
               
                   Enterococcus  [cfu/100 mL] 
                   178 
                   541 
                 0.8 
                 &lt;100 
                 &lt;33 
               
               
                 Planktonic organisms 
                 7,680 
                 1,124 
                 &lt;0.01 
                 &lt;10 
                 &lt;0.01 
               
               
                 10-50 μm [counts/mL] 
               
               
                 Planktonic organisms &gt;50 μm 
                 1.7+E6 
                  6.95+E5 
                 0 
                 &lt;10 
                 0 
               
               
                 [counts/m 3 ] 
               
               
                   
               
             
          
         
       
     
       INDUSTRIAL APPLICABILITY 
       [0093]    The system provided in the present invention is for use on ships to treat ballast water (sterilization and purification), to prevent environmental pollution resulted from charge of ballast water into the ballast tank or discharge of ballast water from the ballast tank. 
         [0000]    
       
         
               
             
               
               
               
               
             
           
               
                   
               
               
                 [Table of Comparison with Other Techniques] 
               
             
          
           
               
                 Country 
                 BWMS 
                 Key Applied Technique 
                 Advantages and Disadvantages 
               
               
                   
               
               
                 Korea 
                 Electro-Clean 
                 Electrosterilization 
                 Single system: Main streamline flow 
               
               
                   
                 Techcross Co., Ltd. 
                   
                 without prefilter 
               
               
                   
                   
                   
                 High cost incurred by electrode 
               
               
                   
                   
                   
                 exchange and neutralization 
               
               
                   
                 NKO3 
                 Ozonization 
                 Sanitizer is not required: O 3  is 
               
               
                   
                 (BlueBallast) 
                   
                 generated automatically. 
               
               
                   
                 NK Co., Ltd. 
                   
                 Ration supply of high density O 3   
               
               
                   
                   
                   
                 High cost incurred by neutralization 
               
               
                   
                 GloEn-Patrol 
                 Automatic backlash 
                 The active substance can be 
               
               
                   
                 Panasia Co., Ltd. 
                 filter 
                 controlled easily 
               
               
                   
                   
                 UV (medium voltage) 
                 Hard to maintain filter efficiency 
               
               
                   
                 EcoBallast 
                 Automatic backlash 
                 The active substance can be 
               
               
                   
                 HHI 
                 filter 
                 controlled easily 
               
               
                   
                   
                 UV (medium voltage) 
                 Hard to maintain filter efficiency 
               
               
                 Japan 
                 Special-Pipe 
                 Cavitation &amp; O 3   
                 Sanitizer is not required: O 3  is 
               
               
                   
                 JAMS 
                   
                 generated automatically. 
               
               
                   
                   
                   
                 Very complex system 
               
               
                   
                   
                   
                 Large noise and high cost incurred 
               
               
                   
                   
                   
                 by high pressure 
               
               
                   
                 Hybrid BWTS 
                 Electrosterilization 
                 Single system: Supply without 
               
               
                   
                 Mitsubishi Group 
                   
                 prefilter 
               
               
                   
                   
                   
                 High cost incurred by neutralization 
               
               
                   
                 ClearBallast 
                 Linking system 
                 Very low operation speed: 3 minutes 
               
               
                   
                 Hitachi Group 
                 (Fe 3 O 4 , [Al(OH 2 ) 6 ] 3+ ) 
                 Large size 
               
               
                   
                 TG Ballastcleaner 
                 Adding system 
                 Continuous supply of chemicals 
               
               
                   
                 and TG 
                 (NaClO, Na 2 SO 3 ) 
                 Hazard in storage and management 
               
               
                   
                 Environmental 
                   
                 of chemicals 
               
               
                   
                 Guard 
               
               
                   
                 Toagosei Group 
               
               
                 Sweden 
                 PureBallast 
                 UV and TiO 2   
                 The active substance can be 
               
               
                   
                 Alfa Laval Co., 
                   
                 controlled easily 
               
               
                   
                 Ltd. 
                   
                 Hard to maintain AOT efficiency 
               
               
                   
                 EctoSys 
                 Electrochemical 
                 Single system: Supply without 
               
               
                   
                 (CleanBallast) 
                 sterilization 
                 prefilter 
               
               
                   
                 Permascand AB 
                   
                 High cost incurred by neutralization 
               
               
                 German 
                 Peraclean 
                 Adding system (15% 
                 Continuous supply of chemicals 
               
               
                   
                 Degussa GmbH 
                 C 2 H 4 O 3 , 
                 Explosion-proof in ship 
               
               
                   
                   
                 14.3% H 2 O 2 , 26.5% 
                 environment 
               
               
                   
                   
                 CH 3 COOH) 
               
               
                   
                 Ecochlor 
                 Adding system with 
                 Continuous supply of chemicals 
               
               
                   
                 Ecochlor GmbH 
                 NaClO 3 , H 2 O 2 &amp;H 2 SO 4   
                 Hazard in storage and management 
               
               
                   
                   
                 (ClO 2 ) 
                 of chemicals 
               
               
                 Norway 
                 Ocean Saver 
                 Hydraulic cavitation 
                 Very complex system 
               
               
                   
                 OceanSaver Co., 
                 Supersaturation 
                 High cost incurred by neutralization 
               
               
                   
                 Ltd. 
                 nitrogen 
               
               
                   
                   
                 Electrochemical 
               
               
                   
                   
                 sterilization 
               
               
                 Netherlands 
                 Greenship 
                 Electrosterilization 
                 Single system: Supply without 
               
               
                   
                 Greenship Co. Ltd. 
                   
                 prefilter 
               
               
                   
                   
                   
                 High cost incurred by neutralization 
               
               
                 USA 
                 Hyde GURDIAN 
                 Automatic backlash 
                 Hard to maintain filter efficiency 
               
               
                   
                 Hyde Marine Co., 
                 filter 
                 (disc filter) 
               
               
                   
                 Ltd. 
                 UV (medium voltage) 
               
               
                 South 
                 Resource Ballast 
                 Cavitation 
                 Very complex system 
               
               
                 Africa 
                 Technologies 
                 Electrochemical 
                 High cost 
               
               
                   
                 System 
               
               
                   
                 Resource Ballast 
                 sterilization 
               
               
                   
                 Technologies (Pty) 
                 Ozone 
               
               
                   
                 Ltd. 
               
               
                   
                 Blue Ocean Shield 
                 Aqueous medium 
                 Large size due to screen filter and 
               
               
                   
                 China Ocean 
                 cyclone &amp; screen filter 
                 low voltage UV 
               
               
                   
                 Shipping Co. &amp; 
                 UV (low voltage) 
                 High cost due to screen filter and 
               
               
                   
                 Tsinghua 
                   
                 low voltage UV 
               
               
                   
                 University 
               
               
                 China 
                 BSKY ™ 
                 Water cyclone &amp; US 
                 Without active substance and 
               
               
                   
                 BWMS(this 
                 filter 
                 byproduct 
               
               
                   
                 invention) 
                 UV (medium voltage) 
                 Without chemical additive, without 
               
               
                   
                 Wuxi 
                   
                 harm to human being and sea area 
               
               
                   
                 BRIGHTSKY 
                   
                 Low power consumption and low 
               
               
                   
                 Electronic CO., 
                   
                 cost 
               
               
                   
                 LTD. 
                   
                 Little or no maintenance 
               
               
                   
                   
                   
                 Low consumption 
               
               
                   
                   
                   
                 Explosion-proof