APPARATUS FOR PURIFICATION OF WATER AREA

Abstract: There is provided a regional water purifier in which blue green algae are collected continuously by using a water flow produced by the operation of a water flow generator, and processed to be made inactive continuously and efficiently by irradiating ultrasonic waves thereon, by which regional water purification is performed efficiently at a far lower cost than the conventional method through the blue green algae processing. The purifier comprises a blue green algae processing duct 2, which is disposed under water in regional waters where blue green algae breed in large quantities, and has an ultrasonic wave transmitter 3 therein for transmitting ultrasonic waves to process the blue green algae with the ultrasonic waves, and both ends of which are open, and a water flow generator 4, which produces a suction flow for sucking water containing blue green algae into the blue green algae processing duct 2 from one end 2a and a discharge flow for discharging the water from the other end 2b.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regional water purifier in which phytoplankton, especially blue green algae, breeding in large quantities in an enclosed water is collected by using a water flow generated by the operation of a water flow generator, and is processed to be made inactive by irradiating an ultrasonic wave, by which the regional waters are purified through blue green algae processing. 2. Description of the Prior Art As a result of the propagation of phytoplankton, especially blue green algae, breeding in large quantities in the eutrophicated water, the water surface is covered with a green substance, so that there occur many cases, in Japan and foreign countries, where the green substance poses a problem in terms of environment protection of water and visual access. To solve this problem, many anti-blue green algal measures have been attempted. These measures are classified broadly as follows: (1) Collective removal 1) Mechanical collection, removal 2) Air bubble pluming, removal (2) Degradation, sedimentation 1) Degradation using biological drug 2) Sedimentation using biological drug (3) Algae processing/cell destruction 1) Mechanical method a) High pressure b) Impact pressure c) Others 2) Chemical method a) Anti-algal additives (4) Propagation control (Control of water temperature, pH, nitrogen, phosphorus, composition ratio change, etc.) Although all of the aforementioned measures of (1) to (4) have been attempted, only (3)-2)-a) addition of copper sulfate solution achieved a relatively distinct effect. Other measures scarcely have effect in relation to great effort, and if they have, the effect is very little, and their cost effectiveness is very low. At present, there are no effective anti-blue green algal measures. For example, a notable anti-blue green algal measure is the collection and removal (corresponding to the above item of (1)-1)) using a surface layer algae collector vessel, which has been used practically in Lake Kasumiga-Ura and other places. With this method, an expensive algae collector vessel must always be provided, and endless collection work must be continued to collect infinitely propagating blue green algae in unmeasured numbers. Further, it takes much time and cost to remove, after filtering and dehydration, large quantities of collected blue green algae. Therefore, this method is not practical, and not modernistic as a technology in the modern technical society. Also, the above item (2) has a problem in that this method is effective in one type blue green algae but ineffective in another type blue green algae, so that it is generally difficult to say that this method has a remarkable effect. Further, the above item (3)-2) sometimes has significant effect. However, this method is hated or prohibited as the present measures in reservoirs, lakes, and rivers because a chemical substance is injected in the system. CH-656 604 A describes a method and an apparatus for increasing the O 2 content in waste water. In the apparatus ultrasonic wave transmitters are positioned at the front positions on the bottom and lower wall portions of a water basin and serve to expose mud or sludge present in the water to ultrasonic vibration. In another embodiment cylindrical elements through which O 2 is introduced into the water are themselves vibrated. DE-43 23 212 A describes a device for treating flowing media with ultrasonic waves. The purpose of the ultrasonic waves in this prior art is to kill small animals and to prepare the fluid for the application of ultraviolet rays. The apparatus has a vertical tube into which water flows from the bottom and below which there is provided a container in which the ultrasonic wave transmitter is positioned. DE-44 07 564 A discloses a method and device for oxidating organic substances and/or microorganisms in water. The device comprises a tube or a channel section through which the water flows. An ultrasonic wave transmitter is positioned within a wall section of the channel. SUMMARY OF THE INVENTION It is an object of the present invention to provide a water purifier for purifying a body of water by inactivating blue green algae by which this algae can be processed to be made inactive continuously and efficiently by irradiating ultrasonic waves thereon, by which regional water purification is performed efficiently at a far lower cost than the conventional method through the blue green algae processing. To achieve the above object, the invention provides a regional water purifier comprising the features defined in claim 1. Preferred embodiments are defined in dependent claim 5. The invention also provides a method of inactivating blue green algae in a body of water using such water purifier. Here, an ultrasonic wave reflector may be mounted on the inner peripheral surface of the blue green algae processing duct, and the ultrasonic wave reflector may be formed by an irregular reflector. The ultrasonic wave transmitter may be disposed in a ring shape at the inside center of the blue green algae processing duct so that the ultrasonic waves are transmitted radially from the inside center toward the inner peripheral surface, or the ultrasonic wave transmitter may be disposed obliquely on the inner peripheral surface at the other end of the blue green algae processing duct toward one end thereof. Further, the ultrasonic wave transmitter may be disposed at the other end of the blue green algae processing duct toward one end thereof. The water flow generator may be disposed at the other end of the blue green algae processing duct, or the water flow generator may be incorporated in a rectifier duct consisting of a duct both ends of which are open to enhance the water flow generating capability of the water flow generator. Further, the water flow generators may be disposed in plural numbers at appropriate intervals in the duct axis direction at the inside center of the blue green algae processing duct, and the ultrasonic wave transmitters may be disposed in plural numbers at appropriate intervals in the duct axis direction of the blue green algae processing duct. The blue green algae processing duct may be curved so that one end of the suction inflow side is placed horizontally in the vicinity of the water surface, and the other end of the discharge side is placed horizontally at a position deeper than one end, or the blue green algae processing duct may be curved so that one end of the suction inflow side is placed horizontally in the vicinity of the water surface, and the other end of the discharge side is placed horizontally on the water bottom side. Further, one end of the suction inflow side of the blue green algae processing duct may be expanded in a trumpet shape. Ozone may be mixed with the discharge flow. Also, the water flow generator may be provided with an ozone gas aerating part. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a regional water purifier showing Embodiment 1 of the present invention; FIG. 2 is another schematic side sectional view of a regional water purifier showing Embodiment 1 of the present invention; FIG. 3 is another schematic side sectional view of a regional water purifier showing Embodiment 1 of the present invention; FIG. 4 is another schematic side view of a regional water purifier showing Embodiment 1 of the present invention; FIG. 5 is another schematic side sectional view of a regional water purifier showing Embodiment 1 of the present invention; FIG. 6 is a side sectional view of a blue green algae processing duct and a rectifier duct showing Embodiment 1 of the present invention; FIG. 7 is a side sectional view of a blue green algae processing duct and a rectifier duct showing Embodiment 1 of the present invention; FIG. 8 is a side sectional view of a blue green algae processing duct and a rectifier duct showing Embodiment 1 of the present invention; FIG. 9 is a side sectional view of a blue green algae processing duct and a rectifier duct showing Embodiment 1 of the present invention; FIG. 10(A) is a front view of a blue green.algae processing duct showing Embodiment 1 of the present invention, and FIG. 10(B) is a side sectional view of a blue green algae processing duct showing Embodiment 1 of the present invention; FIG. 11 is a side sectional view of a blue green algae processing duct and a rectifier duct showing Embodiment 1 of the present invention; FIG. 12 is a side sectional view of a blue green algae processing duct showing Embodiment 1 of the present invention; and FIG. 13 is a side sectional view of a water flow generator showing Embodiment 1 of the present invention DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments shown in the accompanying drawings. [Embodiment 1] In FIGS.1 to 13 which show Embodiment 1 of the present invention, a regional water purifier 1, which purifies enclosed water through blue green algae processing, consists mainly of a blue green algae processing duct 2 which incorporates a ultrasonic wave transmitter 3 generating ultrasonic waves into water in the regional waters where blue green algae breed in large quantities to process the blue green algae with the ultrasonic waves so as to make them inactive, and both ends of which are open, and a water flow generator 4 which generates a suction flow for sucking water containing blue green algae into the blue green algae processing duct 2 from its one end 2a and a discharge flow for discharging the water from the other end 2b. The regional water purifier 1 is used by being hung from a later-described floating body 12 and held under the water surface, or by being placed on the bottom of the water. In the case where the regional water purifier 1 is held under the water surface, the blue green algae processing duct 2 and a rectifier duct 5 incorporating the water flow generator 4 are held by hanging members 12a of the later-described floating body 12 which floats on the water surface, and are located under the water surface below the floating body 12. The water flow generator 4 is generally used in a state of being incorporated in the rectifier duct 5. The blue green algae processing duct 2 has, for example, a hollow cylindrical shape, and both ends thereof are open. It is placed under water in the regional waters where blue green algae breed in large quantities. With the blue green algae processing duct 2, water containing blue green algae flows into the duct from one end 2a by the suction flow produced by the water flow generator 4, the blue green algae floating under water are processed to be made inactive by ultrasonic waves generated by the ultrasonic wave transmitter 3 incorporated in the duct, and after processing, the blue green algae are discharged together with water from the other end 2b. Usually, the blue green algae processing duct 2 is placed in regional waters where blue green algae breed in large quantities so that the duct axis direction thereof is horizontal. However, it is sometimes placed in a curved state as shown in FIGS. 2 to 5. For example, as shown in FIGS. 2 and 3, the blue green algae processing duct 2 is formed so that the halfway portion thereof is bent obliquely in such a manner that one end 2a on the suction inflow side is disposed horizontally in the vicinity of the water surface and the other end 2b on the discharge side is disposed horizontally at a position deeper than one side 2a. Also, for example, as shown in FIGS. 4 and 5, the blue green algae processing duct 2 is sometimes formed so that the halfway portion thereof is bent at right angles in such a manner that one end 2a on the suction inflow side is disposed upward in the vicinity of the water surface and the other end 2b on the discharge side is disposed horizontally on the water bottom side. Further, for example, as shown in FIGS. 5 and 6, the blue green algae processing duct 2 is sometimes formed so that one end 2a on the suction inflow side is expanded in a trumpet shape. Also, for example, as shown in FIGS. 3 and 4, only the opening periphery of one end 2a on the suction inflow side of the blue green algae processing duct 2 is expanded in a trumpet shape, or as shown in FIG. 6, the blue green algae processing duct 2 is formed in a trumpet shape so that the diameter thereof is increased gradually from the other end 2b toward one end 2a. On the inner peripheral surface of the blue green algae processing duct 2, for example, as shown in FIGS. 7 to 9, an ultrasonic wave reflector 2c is usually mounted to reflect the ultrasonic waves transmitted from the ultrasonic wave transmitter 3. A metal plate is used as the ultrasonic wave reflector 2c. The ultrasonic waves transmitted from the ultrasonic wave transmitter 3 are reflected repeatedly by the ultrasonic wave reflector 2c, by which the ultrasonic waves stay in the blue green algae processing duct 2 for a long period of time, so that the floating blue green algae are processed to be made inactive easily. The ultrasonic wave reflector 2c is configured so that the reflecting surface is formed into a flat surface as shown in FIG. 7, or so that the reflecting surface is formed into an irregularly reflecting surface which irregularly reflects the ultrasonic waves as shown in FIGS. 8 and 9. When the irregularly reflecting surface is formed, for example, as shown in FIG. 9, an irregular bent line surface is formed. The ultrasonic wave reflector 2c is sometimes omitted as necessary. The ultrasonic wave transmitter transmits ultrasonic waves to perform a function of processing to make inactive, by the impact of ultrasonic waves, the blue green algae contained in water flowing in the blue green algae processing duct 2. Specifically, it irradiates ultrasonic waves on the blue green algae and gives impact to them. Thereby, gas vacuoles in the blue green algae, which performs a buoyancy function, are destroyed, so that the blue green algae settle without refloating, and thereby they become in an inactive state, and become in a state similar to a perishing state. Therefore, the blue green algae can be processed. The ultrasonic wave transmitter 3 is connected to an ultrasonic wave generator 3a, an electrical energy supply source, installed on the floating body 12 or on land via a wire 3b. Ultrasonic waves are transmitted by being vibrated by the electrical energy amplified by the ultrasonic wave generator 3a, whereby the blue green algae are processed. The ultrasonic wave transmitter 3 mounted in the blue green algae processing duct 2 is installed so as to efficiently irradiate ultrasonic waves on the blue green algae contained in water flowing through the blue green algae processing duct 2. For example, as shown in FIGS. 1 and 12, the ultrasonic wave transmitter 3 is installed on the inner peripheral surface at the upper part of the blue green algae processing duct 2 in a single number or in plural numbers at appropriate intervals to transmit ultrasonic waves in the duct 2. Also, for example, as shown in FIG. 10, the ultrasonic wave transmitter 3 is installed by being supported by support members 3c at the duct center of the blue green algae processing duct 2, and is configured to transmit ultrasonic waves radially from the central portion toward the inner peripheral surface. Also, for example, as shown in FIGS. 7 to 9, the ultrasonic wave transmitter 3 is sometimes installed on the inner peripheral surface at the other end 2b of the blue green algae processing duct 2 so as to be oblique toward one end 2a, that is, the inflow side, and is configured so as to transmit ultrasonic waves obliquely toward one end 2a of the blue green algae processing duct 2. In this case, the obliquely transmitted ultrasonic waves advance toward one end 2a of the blue green algae processing duct 2 while being repeatedly reflected many times by the inner peripheral surface of the blue green algae processing duct 2. For example, as shown in FIG. 11, the ultrasonic wave transmitter 3 is sometimes installed at the other end 2b of the blue green algae processing duct 2 toward one end 2a, that is, the inflow side, and is configured so as to transmit ultrasonic waves toward one end 2a of the blue green algae processing duct 2. In this case, the ultrasonic wave transmitter 3 is installed at a part of the other end 2b, which is open, not to obstruct the discharge flow to the utmost. When a rectifier duct 5 is installed at the other end 2b of the blue green algae processing duct 2, one or several ultrasonic wave transmitters 3 are installed at certain intervals at the open portion at the outer periphery of the rectifier duct 5. The water flow generator 4 produces a suction flow for sucking water containing blue green algae into the blue green algae processing duct 2 from one end 2a thereof and a discharge flow for discharging the water from the other end 2b of the blue green algae processing duct 2. Usually, it is used by being incorporated in a rectifier duct 5 having a function of increasing the function of the water flow generator 4. However, for example, as shown in FIG. 12, the water flow generator 4 is sometimes used by being incorporated independently in the blue green algae processing duct 2. When the water flow generator 4 is used by being incorporated in the rectifier duct 5, it is installed at the other end 2b of the blue green algae processing duct 2 so that the axis thereof agrees with the duct axis of the rectifier duct 5 incorporating the water flow generator 4. The injection direction of water injected from the water flow generator 4 is the same as the duct axis direction of the rectifier duct 5, so that the water flowing from one open end of the rectifier duct 5 is injected and discharged from the other end on the opposite side. For example, as shown in FIG. 13, an inside portion 4a, which is a flow path whose both ends are open, is formed in the water flow generator 4. The inside portion 4a is formed in the lengthwise direction, that is, the axial direction of the water flow generator 4. The inside portion 4a has a cylindrical shape. The downstream end of the cylindrical inside portion 4a consists of a water flow generator discharge port 4b, and the upstream end thereof consists of a water flow generator inflow port 4c. On the flow path inside wall surface at an intermediate part of the inside portion 4a, an injection port 4d for injecting water is formed in the inner peripheral direction. The injection port 4d is formed around the inner periphery of the inside portion 4a. The injection port thus formed is formed obliquely toward the water flow generator discharge port 4b at the downstream end of the inside portion 4a. The water injected from the injection port 4d formed obliquely toward the water flow generator discharge port 4b is injected at a high velocity toward the water flow generator discharge port 4b at the downstream end of the inside portion 4a. This high-velocity injection flow allows a negative pressure region to appear on the downstream side of the injection port 4d, and performs a function of sucking and discharging the later-described ozone. In the section of the water flow generator 4 on the outside of the inside portion 4a, an annular drive water chamber 4e is formed so as to communicate with the injection port 4d. The drive water chamber 4e is a supply portion of water injected from the injection port 4d, and the injection port 4d is formed on the downstream side of the drive water chamber 4e so as to communicate with each other. The rectifier duct 5, which further enhances the function of the water flow generator 4 incorporated therein, is provided with the water flow generator 4 therein. The rectifier duct 5 incorporating the water flow generator 4 is installed at the other end 2b of the blue green algae processing duct 2, which is open. The diameter of the opening of the rectifier duct 5 is usually smaller than the diameter of the opening of the other end 2b of the blue green algae processing duct 2. The rectifier duct 5 is installed at the central portion of the other end 2b of the blue green algae processing duct 2, which is open. At the other end 2b of the blue green algae processing duct 2, to which the rectifier duct 5 is installed, an annular opening is formed on the outer periphery of the rectifier duct 5, so that part of water flowing in the blue green algae processing duct 2 is discharged from the annular opening. Since part of water flowing in the blue green algae processing duct 2 is discharged from the annular opening on the outer peripheral side of the rectifier duct 5, the velocity of water flow induced by the water flow generator 4 is decreased effectively, and the time required for water containing blue green algae to pass through the duct is increased, so that the ultrasonic wave irradiating time on the blue green algae, which passes through the duct, can be taken sufficiently. For example, as shown in FIG. 6, the rectifier duct 5 incorporating the water flow generator 4 sometimes has the same diameter as that of the other end 2b of the blue green algae processing duct 2. In this case, one end of the rectifier duct 5 is connected to the other end of the blue green algae processing duct 2, so that all of the water discharged from the other end of the blue green algae processing duct 2 flows in the rectifier duct 5 and is discharged into water on the outside. The rectifier duct 5 prevents the water injected from the water flow generator 4 from being scattered immediately after injection, and injects the water straight to a far distance. By scattering the water at a far position, it performs a function of agitating the enclosed water in a short time. Although the rectifier duct 5 is placed at the water bottom so that both ends thereof are open substantially horizontally, it may be placed at an arbitrarily inclined angle as necessary. The rectifier duct 5 is formed by a cylinder, and both ends thereof are open. One open end consists of a water inflow port 5a, and the other end consists of a water discharge port 5b. At the lower part of the rectifier duct 5, support members 5c for placing the rectifier duct 5 horizontally on the water bottom side and supporting it are installed on the front side and rear side in the duct axis direction. The drive water chamber 4e of the water flow generator 4 is connected with one end of a drive water supply pipe 6. The other end of the drive water supply pipe 6 is connected to a drive water pump 7. The drive water pump 7 supplies the water of the enclosed water as injection water to the water flow generator 4 through the drive water supply pipe 6. On the flow path inside wall surface of the inside portion 4a on the upstream side of the injection port 4d, a plurality of ozone injection holes 8 for injecting ozone are formed at equal intervals in the inner peripheral direction. The ozone injection hole 8 is formed obliquely toward the water flow generator discharge port 4b at the downstream end of the inside portion 4a. The ozone injection hole 8 has a mechanism such that ozone is sucked and discharged by the water injected at a high velocity through the injection port 4d on the downstream side. In the section of the water flow generator 4 on the outside of the inside portion 4a, an annular ozone supply chamber 8a communicating with the ozone injection hole 8 is formed. The ozone supply chamber 8a is located on the upstream side of the drive water chamber 4e. The ozone supply chamber 8a is a supply portion for ozone injected through the ozone injection holes. Each ozone injection hole 8 is formed on the downstream side of the ozone supply chamber 8a so as to communicate with the ozone supply chamber 8a. The ozone supply chamber 8a is connected with one end of an ozone supply pipe 9. The other end of the ozone supply pipe 9 is connected to an ozone generator 10 provided on the later-described floating body 12 on the water surface. The ozone generator 10 supplies the generated ozone to the water flow generator 4 through the ozone supply pipe 9. The ozone generator 10 has a mechanism such that oxygen in air is changed to ozone by irradiating, for example, ultraviolet rays of a particular wavelength region, and in the hollow vessel, for example, a far ultraviolet ozone ray discharge tube is provided to irradiate ultraviolet rays. An air compressor 11 for supplying air to the ozone generator 10 is provided so as to be connected to the outside of the ozone generator 10. The floating body 12 is a structure floating on the water surface of the enclosed water. The floating body 12 is provided with the ultrasonic wave generator 3a, which is an electrical energy supply source for the ultrasonic wave transmitter 3, the drive water pump 7 for supplying injection water to the water flow generator 4, the ozone generator 10, the air compressor 11, and other equipment, so that the ultrasonic wave transmitter 3, the water flow generator 4, ozone generator 10, and the like can be used at an arbitrary position in the enclosed water. Also, when the blue green algae processing duct 2 is held under water in the vicinity of the water surface, the blue green algae processing duct 2 is supported by the hanging members 12a in the water under the floating body 12, and is held in the vicinity of the water surface. It is to be noted that the ultrasonic wave generator 3a, the drive water pump 7, the ozone generator 10, the air compressor 11, and other equipment may be installed on land as in the case of the prior art. Also, the drive water pump 7 may be installed under water if necessary by using a submerged pump. The following is a description of the operation of the above embodiment. In order to operate the ultrasonic wave transmitter 3 and the water flow generator 4, constituting the regional water purifier 1, the ultrasonic wave generator 3a installed on the floating body 12 or on land and the drive water pump 7 installed on the floating body 12 or on land, or under water if necessary, are driven. Also, when the ozone generator 10 is operated, the air compressor 11 installed on the floating body 12 or on land is driven. If the ultrasonic wave generator 3a installed on the floating body 12 or on land is driven, the ultrasonic wave transmitter 3 provided in the blue green algae processing duct 2 vibrates, and transmits ultrasonic waves toward the inside of the blue green algae processing duct 2. Also, if the drive water pump 7 installed on the floating body 12 or on land, or under water if necessary, is driven, the drive water pump 7 takes in the water in the enclosed water, sends the water under pressure to the drive water supply pipe 6, and supplies it to the water flow generator 4 in the rectifier duct 5 installed on the bottom of the water. Further, if the air compressor 11 installed on the floating body 12 or on land is driven, the air compressor 11 sucks and compresses the air in the atmosphere and sends it into the ozone generator 10. The ozone generator 10 is provided with, for example, the far ultraviolet ozone ray discharge tube, so that part of oxygen in the sent air is changed to ozone by the irradiation of far ultraviolet ozone ray, and the ozone is allowed to flow down in the ozone supply pipe 9 to be supplied to the water flow generator 4 in the rectifier duct 5 placed on the bottom of the water. The water supplied to the water flow generator 4 through the drive water supply pipe 6 by the drive of the drive water pump 7 enters the annular drive water chamber 4e formed in the water flow generator 4, and is injected from the drive water chamber 4e into the inside portion 4a through the injection port 4d on the outlet side. The water injected into the inside portion 4a through the injection port 4d is injected at a high velocity toward the water flow generator discharge port 4b. The water injected at a high velocity pushes out the water on the downstream side of the injection port 4d at a high velocity toward the water flow generator discharge port 4b. At this time, on the upstream side of the injection port 4d of the inside portion 4a, a negative pressure region is produced by the water injected toward the water flow generator discharge port 4b, and the production of the negative pressure region generates a suction force. By this suction force, the water in the blue green algae processing duct 2 is allowed to flow into the inside portion 4a from the water flow generator inflow port 4c of the inside portion 4a. The water is sucked and flows to a location where the injection port 4d of the inside portion 4a is formed, and then is pushed out toward the water flow generator discharge port 4b at a high velocity by the water injected toward the downstream side of the injection port 4d. On the other hand, the water in the blue green algae processing duct 2 is sucked from the other end 2b by the water flow generator 4 and discharged. Therefore, a negative pressure region is produced on one end 2a of the blue green algae processing duct 2, and at one end 2a of the blue green algae processing duct 2, a suction flow for sucking the water in the duct 2 is generated, so that the water containing blue green algae flows into the blue green algae processing duct 2 from one end 2a, flows through the duct 2, and moves toward the other end 2b. The ultrasonic wave transmitter 3, which is provided in the blue green algae processing duct 2, transmits ultrasonic waves toward the inside of the duct 2. The ultrasonic waves transmitted in the blue green algae processing duct 2 act on the water containing blue green algae directly or while being reflected by the ultrasonic wave reflector 2c when the ultrasonic wave reflector 2c is mounted on the inner peripheral surface of the blue green algae processing duct 2. If the ultrasonic waves act on the water containing blue green algae, which moves in the blue green algae processing duct 2, the gas vacuoles performing a function of buoyancy in the blue green algae floating in the water are destroyed by the impact of the ultrasonic waves. Therefore, the blue green algae cannot float again, and thereby they become in an inactive state, and become in a state similar to a perishing state, whereby the blue green algae can be processed. Thus, the blue green algae breeding in large quantities in the enclosed water are sucked from one end 2a of the blue green algae processing duct 2 together with the water containing the blue green algae, and during the transfer in the duct 2, they are processed by the action of ultrasonic waves transmitted from the ultrasonic wave transmitter 3 provided in the blue green algae processing duct 2. Thereafter, the blue green algae are discharged from the other end 2b of the blue green algae processing duct 2. In the case where the rectifier duct 5 incorporating the water flow generator 4 is installed at the other end 2b of the blue green algae processing duct 2, when the inside diameter of the other end 2b of the blue green algae processing duct 2 is larger than the outside diameter of the rectifier duct 5, and an annular opening is formed at the outer periphery of the rectifier duct 5, part of the water containing the processed blue green algae is discharged into the water of the outside from the other end 2b of the blue green algae processing duct 2, and the remaining water containing the processed blue green algae flows in the rectifier duct 5 and the water flow generator 4 and is discharged into the water of the outside. When the diameter of the rectifier duct 5 is equal to the diameter of the other end 2b of the blue green algae processing duct 2, and one end of the rectifier duct 5 is connected to the other end of the blue green algae processing duct 2, the water flowing in the blue green algae processing duct 2 enters the rectifier duct 5, flowing in the rectifier duct 5 and the water flow generator 4, and is discharged into the water of the outside. Also, when the water flow generator 4 is installed in the blue green algae processing duct 2, the water is discharged into the water of the outside from the other end 2b of the blue green algae processing duct 2. The ozone supplied to the water flow generator 4 through the ozone supply pipe 9 enters the annular ozone supply chamber 8a formed in the water flow generator 4, and is sucked and injected into the inside portion 4a from the ozone supply chamber 8a through the ozone injection holes 8 on the outlet side. At the location of the inside portion 4a where the ozone injection holes 8 are formed, a negative pressure region is produced by the water injected through the injection port 4d. By the suction force due to the negative pressure, the ozone is sucked and injected from the ozone injection holes 8. The ozone sucked and injected in the inside portion 4a from the ozone injection holes 8 is mixed with water flowing in the inside portion 4a at a high velocity toward the water flow generator discharge port 4b. As a result, the ozone becomes of a very fine minute bubble shape, and an ozone gas aerating water flow less liable to float is produced, which becomes a discharge flow injected at a high velocity from the water flow generator discharge port 4b of the water flow generator 4. Ozone is mixed with the discharge flow injected at a high velocity from the water flow generator discharge port 4b. This ozone mixing water flows in the rectifier duct 5 provided with the water flow generator 4 therein, and is discharged at a high velocity on the bottom layer side of the enclosed water of the outside. The processed blue green algae are mixed with the ozone gas aerating water discharged at a high velocity, so that the processed blue green algae, which are an organic substance, are decomposed by oxidation by the oxidizing action of ozone. Therefore, the cause for the blue green algae to be accumulated on the water bottom in a state of organic substance and for sludge to be formed and accumulated can be eliminated. Also, the blue green algae/ozone mixing water injected at a high velocity from the water flow generator discharge port 4b is prevented from scattering to the surroundings immediately after the injection from the water flow generator 4 by passing through the duct inside of the rectifier duct 5. Further, since the minute bubbles less liable to float are injected substantially straight in the discharge direction, the force of the injected blue green algae/ozone mixing water is prevented from decreasing, so that the mixing water can be injected to a far distance in a straight manner. Therefore, the blue green algae/ozone mixing water can be sent out to a far distance on the bottom layer side of the enclosed water, so that the blue green algae water mass can be circulated in the regional waters, thereby enhancing the algae processing performance.

Claims: A water purifier for purifying a body of water by inactivating blue green algae, comprising: a processing duct (2) having a first open end (2a) and a second open end (2b), said processing duct (2) being submersible in said body of water; an ultrasonic wave transmitter (3) arranged in said processing duct (2) for transmitting ultrasonic waves through water flowing through said processing duct (2) from said first open end (2a) to said second open end (2b) when submersed in water; a rectifier duct (5) having a first open end (5a) and a second open end (5b), said first open end (5a) of said rectifier duct (5) being arranged at said second open end (2b) of said processing duct (2) and having a cross sectional area which is smaller than a cross sectional area of said second open end (2b) of said processing duct (2) such that a discharge opening of said second open end (2b) of said processing duct (2) is formed on the outer periphery of said rectifier duct (5); and a water flow generator (4) arranged in said rectifier duct (5) for creating a flow of water through said rectifier duct (5) and through said processing duct (2). A water purifier according to claim 1, wherein an ultrasonic wave reflector (2c) is mounted on an inner peripheral surface of said processing duct (2). A water purifier according to claim 2, wherein said ultrasonic wave reflector (2c) has an irregularly reflecting surface. A water purifier according to claim 1, wherein said ultrasonic wave transmitter (3) comprises a ring shaped transmitter arranged along a central axis of said processing duct (2) such that ultrasonic waves are transmitted radially from said transmitter toward an inner peripheral surface of said processing duct (2). A water purifier according to claim 1, 2 or 3, wherein said ultrasonic wave transmitter (3) is disposed on an inner peripheral surface of said processing duct (2) at said second open end (2b) thereof and is arranged so as to transmit ultrasonic waves at an oblique angle towards said first open end (2a). A water purifier according to claim 1, wherein said ultrasonic wave transmitter (3) is disposed at said second open end (2b) of said processing duct (2) and is arranged so as to transmit ultrasonic waves towards said first open end (2a) thereof. A water purifier according to claim 1 or 2, further comprising a plurality of ultrasonic wave transmitters (3) spaced apart in a longitudinal direction of said processing duct (2). A water purifier according to claim 1 or 2, wherein said processing duct (2) is curved such that a central axis of said first open end (2a) is horizontal, and such that a central axis of said second open end (2b) is horizontal at a position below said central axis of said first open end (2a). A water purifier according to claim 1 or 2, wherein said processing duct (2) is curved such that a central axis of said first open end (2a) is vertical, and such that a central axis of said second open end (2b) is horizontal and positioned below said first open end (2a). A water purifier according to claim 1, 8 or 9, wherein said processing duct (2) has a cross sectional area gradually increasing towards said first open end (2a). A water purifier according to any one of claims 1 to 10, further comprising means (8) for mixing ozone into water to be discharged from said water purifier. A water purifier according to claim 11, characterized in that said water flow generator (4) includes an ozone gas aerating mechanism (8,8a). A method of inactivating blue green algae in a body of water using the water purifier as defined in any one of claims 1 to 12, comprising the following steps: producing a flow of water containing blue green algae within the body of water through the processing duct (2) of the water purifier; treating the water by transmitting ultrasonic waves onto the flow of water during the transfer through the processing duct (2), thereby destroying gas vacuoles in the blue green algae cells performing the function of controlling buoyancy in the blue green algae cells; discharging the so treated water and blue green algae cells into the body of water. A method according to claim 13, further comprising a step of mixing ozone gas into the water being discharged from the processing duct (2).

Inventors: KASAI HIRONAO, YOSHINAGA KATSUTOSHI, KASAI, HIRONAO, YOSHINAGA, KATSUTOSHI
Applicants: MARINE TECHNO RES INC, MARINE TECHNO RESEARCH, INC.
Application year: 1998
Main classification: C02F1
IPC codes: C02F1, B01F3, B01F5, B01F11, B01F13, C02F7