JP2011011098A - Water purification apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem: an aeration means is disposed in a deep layer for the conventional water bloom countermeasures in a closed water area, and in wastewater treatment and the like where an aerobic biological treatment reaction tank of organic wastewater is disposed at a high depth, but knowledge that a circulating flow capable of achieving energy saving is formed by arranging the aeration means in a shallow layer and directly mixing water in a deep layer with surface water has not been disclosed.SOLUTION: Suction pipe whose inflow port sinks under the surface of a closed water area, such as a dam reservoir, a lake, and a sea area, communicates and is connected with the suction port of a circulating pump, and air lift effects by a microbubble generator and a draft tube installed in an aeration device are used together as the water bloom countermeasures and anoxic water mass countermeasures in a dam reservoir, a lake, a sea area, and the like. The same means can be applied to aeration treatment, solid-liquid membrane separation treatment, and ozonolysis treatment of refractory wastewater in biological treatment of the organic wastewater in the treatment tank disposed at high depth.

Description

The present invention supplies drought oxygen water to anoxic water masses in closed water areas such as dam reservoirs, lakes, marine areas, etc., or water in a closed water area stratified by a water temperature difference as surface water. By mixing, the water temperature limiting effect of the active layer of the phytoplankton, and by expanding the circulating mixed layer, the activity light limiting effect of the phytoplankton and the surface water with high phytoplankton are diluted to purify the closed water area. The present invention also relates to a diffused water purification device for an ozone contact reaction tank, an aerobic wastewater treatment aeration tank, and a membrane separation tank.
Aerobic wastewater treatment aeration tank, membrane separation tank, and ozone contact reaction tank, aerobic wastewater treatment aeration tank is also provided with air lift effect by arranging aeration means at sufficient water depth to achieve energy saving In addition, gas suction means is disposed in the water supply pipes of the circulation pumps of the membrane separation tank and the ozone contact reaction tank to provide a circulation flow and aeration generation means in the aerobic wastewater treatment aeration tank.

  A compressor or blower having a large required power has been used as a means for supplying oxygen to anoxic water blocks in closed water areas such as dam reservoirs, lakes and marshes, or for circulating and mixing surface water and hot water.

  In addition, the immobilized microorganisms are put into a vertically long deep aeration tank having a descending pipe part and an ascending pipe part in parallel, and aeration treatment is performed by circulating and flowing sewage.

Also, it has a pressurized liquid introduction hole, an introduction part in which a gas introduction hole is formed, and a cylindrical bubble generation space, and a pressurized liquid introduction hole and a gas introduction hole that open to the bubble generation space are formed in the introduction part. Microbubble discharge with a pressurized liquid introduction hole opened on the introduction end face, a gas introduction hole opened on the side surface of the introduction part, and a gas introduction pipe communicating with the gas introduction hole provided with an adjustment valve for adjusting the gas introduction amount It is a nozzle. Also, a pipe for supplying water pressurized by a pump and discharging it together with self-priming air, a spherical body located in the middle of the pipe, and a downstream of the spherical body insertion center The microbubble manufacturing apparatus includes a small hole formed on the circumference of the pipe and an air chamber communicating with the atmosphere provided outside the small hole.

Further, a diffuser having an upward blow hole below the vertical flat membrane module in the treated water of the treatment tank, and an ejector having an air suction pipe and an upward discharge port of the ejector having the treated water as differential water Are placed with the former on top and the latter on the bottom.

  Further, in the oxidation purification of persistent degradable wastewater by ozone and the aerobic biological treatment of organic wastewater, the required power of the blower and the like increases in proportion to the power as the diffused water depth increases. High water depth with high oxygen dissolution efficiency and utilization efficiency was not realized. In addition, the ozone water manufacturing apparatus which melt | dissolves ozone in water with an ejector is disclosed.

JP 7-251196 A JP 10-314786 JP2003-305494 JP 10-85565 JP2003-144875

However, in the conventional aqua red tide countermeasure aeration and circulation facility in the closed water area, the aeration means is arranged in the deep layer, so the blower or compressor drive power cost increases in proportion to the power of the water depth (water pressure) There was a problem to do.

In addition, the knowledge of supplying the oxygen to the oxygen-poor water mass by sucking the atmosphere into the water supply pipe of the circulation pump without installing a blower or compressor and the blower or submersible mixer with the minimum discharge capacity are used in combination. The knowledge of forming a circulating flow with the circulating means has not been disclosed.

In addition, the inlet is immersed in a shallow water layer below the surface of the water, and a water suction pipe is connected to the suction side of the circulation pump. A microbubble in which a discharge port of a water pipe connected in communication with a discharge port of a circulation pump is arranged, and a microbubble generator equipped with an air self-priming introduction pipe is arranged in the middle of the water supply pipe of the circulation pump Dissolve water supply means or nanobubble dissolution water supply means provided with a nanobubble generator and an air diffuser for supplying air with a blower having the minimum required discharge capacity, an underwater mixer, or a pump. The knowledge of forming a circulating flow by installing it has not been disclosed.

Also, in the aeration tank having the upflow part and the downflow part by arranging a partition plate having an opening at the bottom of the tank and the water surface part, the microbubble generator or A nanobubble generator is disposed and ejected downward, and a diffuser for supplying air with a blower, a submerged mixer or the like is disposed at a relatively shallow water depth position of the upward flow portion, or The knowledge of forming a circulating flow by arranging a pump or the like has not been disclosed.

In addition, in solid-liquid membrane separation processing of liquids containing solids such as suspensions and sludges, in order to enable a long-term stable filtration operation, relatively large bubbles and microbubbles or nanobubbles are formed on the membrane surface. However, there has been no disclosure of the knowledge that the turbulent flow rises along the vertical film surface.

In addition, as an installation position of the diffuser that diffuses ozone to the contact reaction tank in the discoloration of dyeing liquid, paint wastewater and other decoloring, polymer-containing liquid, cleaning liquid and other difficult-to-decompose wastewater, and advanced treatment of organic wastewater In the prior art, it is located near the bottom of the contact reaction tank, and the ozone dissolution efficiency and ozone utilization rate are small for the larger blower power, the water depth of the contact reaction tank is increased, and the water supply pipe of the circulation pump is increased. There has been no disclosure of knowledge that a microbubble generator or nanobubble generator that self-sucks ozone in the middle or at the tip and jets downward in a shallow layer near the water surface of the contact reaction tank.

Further, neither speed energy increasing means for converging the circulating flow energy by the streamline converging means for circulating flow nor pressure energy increasing means for converting the speed energy into pressure energy has been disclosed.

    Accordingly, the present invention provides a microbubble generator or nanobubble generator that self-sucks the atmosphere in the middle or the tip of the water supply pipe of the circulation pump, and the blower air diffuser is relatively disposed in the draft tube. Mixing the water in the deep layer directly with the surface water by using a circulating flow generating means that generates a circulating flow at a shallow water depth position or a circulating flow generating means that generates a circulating flow with an underwater mixer or pump, etc. The first task is to create a circulating flow. Another object of the present invention is to obtain an oxygen solubility or ozone solubility equal to or higher than that in the case where an air diffuser is provided in the deep layer portion with an air diffuser that sucks the atmosphere into the water supply pipe of the circulation pump. In addition, it is an air diffuser that sucks air into the water supply pipe of the circulation pump. It saves energy compared to the case where an air diffuser is installed in the deep layer and air, oxygen, ozone, etc. is supplied by a blower or compressor. This is the third issue. A fourth problem is to achieve high purification efficiency.

In order to achieve the above object, the present invention has a technical configuration as described below. That is, the same water area where the inflow port is immersed in a shallow water layer below the surface of a closed dam reservoir, lake, marine area, etc., and the suction pipe is connected to the suction side of the circulation pump, and the inflow port is disposed. A microbubble generator or a nanobubble generator equipped with an air self-priming means in the middle or at the tip of a water pipe connected in communication with the discharge side of the circulation pump at a deep water depth position A diffuser for supplying air with a blower to a relatively shallow water depth position in a draft tube having dissolution water supply means or nanobubble dissolution water supply means, and a stretchable means capable of selectively disposing a water suction port in the water temperature layer water Is a water purification device comprising circulating flow generating means for forming a circulating flow.

Further, as the circulating flow generating means, an underwater mixer that forms a circulating flow in the water surface direction can be provided.

Further, in the aeration tank having the upflow part and the downflow part by arranging a partition plate having an opening in the tank bottom and the water surface part, the inlet is immersed in a shallow water depth position below the water surface of the upflow part. A water suction pipe is connected to the suction side of the circulation pump, and an air self-priming means is provided in the middle of the water supply pipe connected to the discharge port of the circulation pump at the shallow water depth position below the water surface of the downflow part. Microbubble dissolving water supply means or nanobubble dissolving water supply means in which the discharge port of the microbubble generator or nanobubble generator is arranged downward, and the air blown by a blower to a relatively shallow water depth position of the upward flow portion. A circulating flow generating means that forms an upward flow by an air lift effect, or an underwater mixer that forms an upward flow in the water surface direction is used as the circulating flow generating means, or a water inlet is provided in the upward flow portion. Arranged and lowered A pump which is disposed a discharge port configured by a combination of those and the circulation flow generating means parts.

Further, in the treated water in the aerobic reaction tank, a single or any plurality of draft tubes having a lower opening and an upper opening with a solid-liquid separation membrane installed therein are disposed, and the inside of the draft tube An air diffuser that blows air or oxygen sent from a blower or the like in the direction of the water surface below the solid-liquid separation membrane has a water inlet at the water level near the bottom of the aerobic reaction tank. In the middle or tip of the water pipe, the discharge port of the circulation pump provided with the microbubble generator equipped with the atmospheric self-priming means is arranged in the direction of the water surface and is relatively large from the air diffuser. Air bubbles and microbubbles or nanobubbles from the microbubble generator or nanobubble generator are configured to rise along the surface of the solid-liquid separation membrane.

In addition, an inflow port is provided in the bottom water of the reaction tank having a long and narrow cross-sectional area so that the vertical downward flow velocity in the transverse section has a substantially uniform distribution with an ultraviolet lamp. In addition, a microbubble generator or a nanobubble generator equipped with ozone self-priming means is provided in the middle or at the tip of the water supply pipe connected to the suction side of the circulation pump in communication with the water suction pipe and connected to the discharge port of the circulation pump. And disposing the discharge port of the microbubble generating device or nanobubble generating device below the water surface of the reaction tank and downwardly at a shallow water depth position to form a circulating flow and water quality purification means To do.

Further, a speed energy increasing means for converging the circulating flow energy with a streamline converging means for the circulating flow and a pressure energy increasing means for converting the speed energy into pressure energy are connected in communication with the water inlet of the circulation pump.

In addition, a blower is connected to the atmosphere or ozone self-priming means of the microbubble generating device or nanobubble generating device equipped with the air or ozone self-priming means.

  Immerse the inlet under the surface of the water and connect the water suction pipe to the suction side of the circulation pump, and place it in the same water area or the same water tank where the inlet is located, and in the middle of the water supply pipe of the circulation pump or Air diffused by air blown by a blower that draws air into the microbubble generator or nanobubble generator at the tip, generates a gas-liquid two-phase flow containing microbubbles or nanobubbles, and forms dissolved gas supply means Dissolving efficiently and highly energy-saving by using a circulating flow generating means that forms an upward flow by the air lift effect or an underwater mixer that forms an upward flow in the water surface direction as a circulating flow generating means. It has been found that oxygen supply means and circulating flow generation means are provided.

  An air diffuser for supplying air by a blower is disposed at a shallow water depth in the draft tube to provide a circulating flow generating means for forming a circulating flow by an air lift effect. It has been found that even if the water depth position where the air diffuser is disposed is disposed at a shallow water depth position, the mixed water at the deep bottom of the tank is efficiently circulated in the water surface direction.

  In addition, a water inlet is connected to the suction side of the circulation pump that circulates the water in the organic wastewater aerobic reaction tank, and the air itself is connected to the middle or tip of the water pipe connected to the discharge side of the circulation pump. Disposing the discharge port of the gas-liquid two-phase flow sending means constituted by connecting the millimeter bubble generating device or the centimeter bubble generating device equipped with the suction means at the lower water depth position of the contact material or the solid-liquid separation membrane, Bubbling cleaning means for contact material or solid-liquid separation membrane.

  The operation of the above means is as follows. That is, the inlet of the closed dam reservoir, lake, marine area, etc. is immersed in the inlet and a suction pipe having fluid friction loss reduction means is connected to the suction side of the circulation pump, the dam reservoir, lake, Gas-liquid two-phase by disposing a discharge port in a poor-oxygen water mass layer in the sea area and the like, and arranging a microbubble generator or nanobubble generator equipped with air self-priming means in the middle or at the tip of the water pipe of the circulation pump When configured to erupt, the water containing phytoplankton such as sea lions is pumped to an anoxic water mass layer at an arbitrary depth, and the phytoplankton is transported to a low temperature and light-free environment to grow. Inhibited or killed. The microbubble generator generates fine bubbles of 10 to several tens of microns, and the nanobubble generator generates nanobubbles having a bubble diameter of several hundred nanometers or less. The microbubbles or nanobubbles act as an advantage of floating the anoxic water mass layer and quickly dissolving as dissolved oxygen in the anoxic water to increase the dissolved oxygen concentration, but have little effect of forming a circulating flow. On the other hand, when air blown by a blower or the like is diffused by a diffuser to a relatively shallow water depth position in a draft tube having a retractable means capable of selectively disposing a water inlet at a high water depth, As it rises in the water surface direction, it gradually grows into large bubbles, entrains surrounding water masses and rises to the water surface to form a circulating flow. The required power of the blower decreases in proportion to the power of the water depth as the water depth position where the diffuser is immersed is shallower. The air diffuser in the draft tube has a large effect of generating a circulating flow, but has a relatively small effect of dissolving oxygen in the air into water. In addition, the deep anoxic water mass is drought oxygenated and the water temperature rises, the upper high temperature water mass and the deep low temperature water mass are mixed, and the upper high temperature water mass descends with the swirling descending water flow. Then, the phytoplankton that inhabited the upper layer is transported to a low temperature and light-free environment, and its growth is inhibited or died.

In addition, as an alternative to the air diffuser, the air sent by the blower or the like is provided with an underwater mixer to form a circulating flow in the direction of the water surface. And the upper high-temperature water mass descends with the swirling descending water flow. Then, the phytoplankton that lived in the upper layer is transported to a low temperature and light-free environment, and its growth is inhibited or killed.

Further, in an aerobic reaction tank having a partition plate having an opening at the bottom of the tank and a water surface part and having an upward flow part and a downward flow part, the inlet is immersed in a shallow water layer below the surface of the upward flow part. At the same time, a water suction pipe is connected to the suction side of the circulation pump, and an air self-priming means is provided in the middle or at the tip of the water supply pipe connected to the discharge side of the circulation pump at a shallow water depth position below the water surface of the downward flow section. When the discharge port of the equipped microbubble generator or nanobubble generator is disposed downward and a gas-liquid two-phase flow containing microbubbles or nanobubbles is ejected, the microbubbles or nanobubbles have a surface area of a single bubble. It is large and its ascending force in water is extremely small, so it dissolves in water in a short time and dissolves in water while slowly descending toward the bottom of the tank at low speed while entraining surrounding water with the jet. Fine Things consumes dissolved oxygen to purify water. Further, by increasing the depth of the aerobic reaction tank, the oxygen solubility is increased. The microbubble generator generates microbubbles with a bubble diameter of 10 to several tens of microns, and the nanobubble generator generates nanobubbles with a bubble diameter of several hundred nanometers or less, and the microbubbles or nanobubbles form an anoxic water mass layer. It acts as an advantage of floating and quickly dissolving as dissolved oxygen in poor oxygen water to increase the concentration of dissolved oxygen, but has little effect on forming a circulating flow. On the other hand, when an air diffuser that supplies air with a blower is disposed at a relatively shallow water depth position of the upward flow portion, when air bubbles are generated with a bubble diameter of 1 mm or larger, Since bubbles dissolve slowly in water and rise in water, the partition plate and tank wall act as a draft tube, and the air lift effect creates an upward flow in the direction of the water surface. A micro-bubble below microbubbles such as nitrogen gas other than oxygen consumed mostly in the descending flow part is taken up into a large bubble above the millibubble and integrated and rises. Even if the air diffuser is disposed at a relatively shallow depth, the activated sludge mixed water at the bottom of the tank is fed in the direction of the water surface due to the air lift effect, so that solid matter remains at the bottom of the tank. Without acting, it acts as an advantage of forming a circulating flow in the entire aerobic reaction tank. In addition, as an alternative to the air diffuser, the air sent by the blower or the like is provided with an underwater mixer or a pump to form a circulating flow in the water surface direction, so that activated sludge at the bottom of the tank is formed. Since mixed water or the like is fed in the direction of the water surface, there is an effect of forming a circulating flow in the entire aerobic reaction tank without solid matter remaining at the bottom of the tank.

In particular, when the submerged mixer is disposed in the upflow portion, the discharge flow rate by the submersible mixer in the submerged mixer portion is higher than the upflow velocity other than the submersible mixer portion in the upflow portion. , Forming a decompression basin, becoming a cavitation state, and fine bubbles such as nitrogen gas other than oxygen consumed mostly in the downward flow portion grow rapidly into large bubbles, so that degassing progresses and the energy source of the circulating flow Become.

Further, in the treated water in the aerobic reaction tank, a single or any plurality of draft tubes having a lower opening and an upper opening with a solid-liquid separation membrane installed therein are disposed, and the inside of the draft tube An air diffuser that blows air or oxygen sent from a blower or the like in the direction of the water surface below the solid-liquid separation membrane has a water inlet at the water level near the bottom of the aerobic reaction tank. A microbubble generator or nanobubble generator equipped with atmospheric self-priming means is arranged in the middle or tip of the water pipe, and the discharge port is arranged in the direction of the water surface. If the bubble and the microbubble from the microbubble generator or the nanobubble from the nanobubble generator are configured to rise along the surface of the solid-liquid separation membrane, a strong upward flow may be generated depending on the air diffuser. Occasionally, depending on the microbubble generator or nanobubble generator, innumerable independent microbubbles or nanobubbles containing high negative charge amount are generated on the surface, so that water bubbles are generated on the surface of the solid-liquid separation membrane. It acts to neutralize the positive charge of the accumulated solids. In addition, a strong turbulent flow is generated in the treated water near the solid-liquid separation membrane due to the relatively large bubbles larger than the millibubble of the diffuser and the fine bubbles.

  In addition, the cross-sectional area is made as small as possible and an inflow port is provided in the elongated tank bottom so that the vertical downward flow velocity has a substantially uniform distribution in the cross section of the reaction tank provided with the ultraviolet lamp. In addition, a microbubble generator or a nanobubble generator equipped with ozone self-priming means is provided in the middle or at the tip of the water supply pipe connected to the suction side of the circulation pump in communication with the water suction pipe and connected to the discharge port of the circulation pump. When the microbubble generating device or the nanobubble generating device is disposed so that the discharge port of the microbubble generating device or nanobubble generating device is below the water surface of the reaction tank and is directed downward at a shallow water depth, the surface area of the single bubble is large. At the same time, since the ascending force in water is extremely small, when dissolved in water in a short time, the transparency of the water increases, it becomes easy to transmit ultraviolet rays, and the cross-sectional area of the reaction vessel is minimized. Due to the long and narrow shape, the ultraviolet rays are effectively projected onto the water to be treated in which ozone passing through the vicinity of the location of the ultraviolet lamp is dissolved, and OH radicals are effectively generated via hydrogen peroxide. Is done. In addition, since the ultraviolet intensity of the ultraviolet lamp attenuates the distance, the OH radical concentration becomes high only in the vicinity of the ultraviolet lamp. Therefore, the area far from the ultraviolet lamp is a useless space, and the cross-sectional area of the reaction tank is reduced. A small, i.e. elongated, reaction vessel is sufficient.

Further, when the circulation stream line in a range wider than the suction pipe diameter of the circulation pump is converged by the stream line converging means, the velocity energy increases, but if the increased velocity energy is further converted into pressure energy, the pressure energy increases. When the streamline converging means and the pressure energy increasing means are connected to the water suction port of the circulation pump, the pushing water pressure increases and the required power of the circulation pump is reduced.

Further, in the micro bubble generating device or the nano bubble generating device equipped with the atmospheric or ozone self-priming means, when the air or ozone self-priming means is connected to the air feeding means such as a blower or a compressor, the air or ozone self-priming means The self-suction force acts to reduce the required power of the blower or compressor.

In addition, a water inlet is connected to the suction side of the circulation pump that circulates the water in the organic wastewater aerobic reaction tank, and the air itself is connected to the middle or tip of the water pipe connected to the discharge side of the circulation pump. Disposing the discharge port of the gas-liquid two-phase flow sending means constituted by connecting the millimeter bubble generating device or the centimeter bubble generating device equipped with the suction means at the lower water depth position of the contact material or the solid-liquid separation membrane, Bubbling cleaning means for contact material or solid-liquid separation membrane. In the contact aeration tank, the biofilm carried on the contact material gradually thickens, and excessive sludge accumulates, which easily causes clogging and clogging. When bubbling is performed regularly, the thickened sludge is peeled off, so the peeled sludge is returned to an anaerobic filter bed tank or the like. Also, in the solid-liquid separation membrane tank, if a relatively large bubble is diffused by the bubbling cleaning means and rises along the solid-liquid separation membrane surface, the solid-liquid separation membrane tank acts so as not to accumulate solid matter on the membrane surface. To do.

  Since the present invention is configured as described above, the following effects can be obtained.

When water from closed water areas such as dam reservoirs, lakes, and seas is directly circulated into the water of the same water area using a circulation pump, it is not necessary to pump the water to a high place, thus saving energy. And is it necessary to dispose a blower or a compressor for air diffusion by disposing a microbubble generator or nanobubble generator equipped with atmospheric self-priming means in the middle or at the tip of the water supply pipe of the circulation pump? Alternatively, even if a low-pressure blower is sufficient, and it is applied to a water area and a water tank having a large water depth, the saturated concentration of gas such as oxygen or ozone and the overall gas transfer coefficient are increased, which greatly saves energy. In addition, a diffuser for diffusing the air supplied by a blower or the like is disposed at a relatively shallow depth in the draft tube having a retractable means that can selectively dispose the water inlet at a high water depth. By providing a circulating flow generating means that circulates and mixes the surface layer water and the water temperature stratified water, it becomes unnecessary to use a conventional compressor or blower having a large required power. That is, when the microbubble generating device or nanobubble generating device and the aeration device in the draft tube are provided side by side, there is an effect of taking advantage of each advantage and compensating each drawback. In addition, as a circulating flow production | generation means, there exists an effect similar to the said circulation flow production | generation means also by arrange | positioning the underwater mixer which forms the circulation flow of a water surface direction.

Moreover, by using the atmospheric self-priming means, the water absorption pipe or the water supply pipe having the fluid friction loss reduction means, the fluid friction loss is reduced, and the required power is reduced.

In addition, since the size of the fine bubbles can be easily selected only with the adjustment valve, it can be made of only fine bubbles or a mixture of relatively large bubbles. A device with the same swirl flow forming function between the surface water area and the water temperature jump layer can be selected as necessary.

Further, the smaller the bubble diameter, the longer the contact time until the bubbles are detached from the water surface and the larger the specific surface area, thereby increasing the solubility and reactivity of oxygen gas and ozone.

  In addition, since oxygen is supplied to the deep anoxic water mass, there is an effect of suppressing re-elution of sparingly soluble nutrients by anaerobic bacteria.

In addition, when air that does not dissolve in water in the deep layer rises toward the water surface, a circulating mixed layer is formed from the surface layer to the deep layer, and when the water and air in the water warming layer rise to the water surface due to the air lift effect, the circulating mixed layer is formed. When formed, surface water containing phytoplankton advects and mixes to the deep layer or water-climbing layer, and low-temperature deep water or water-climbing layer water advects and mixes to the surface layer to prevent phytoplankton from growing abnormally. It has the effect of creating an environment such as limiting light to phytoplankton and diluting surface water having a high phytoplankton solid number.

Further, in the aeration tank having the upflow part and the downflow part by arranging a partition plate having an opening in the tank bottom and the water surface part, the inlet is immersed in a shallow water layer below the water surface of the upflow part. A water suction pipe is connected to the suction side of the circulation pump, and an air self-priming means is provided in the middle of the water supply pipe connected to the discharge port of the circulation pump at the shallow water depth position below the water surface of the downflow part. When the microbubble dissolution water supply means or nanobubble dissolution water supply means with the discharge port of the microbubble generation apparatus or nanobubble generation apparatus arranged downward is arranged, the microbubble or nanobubble has a large surface area of single bubbles and rises in water In the aerobic reactor, which has a very small force and dissolves in water in a short time, and descends, the oxygen solubility increases as the microbubbles or nanobubbles descend and the water depth increases. It achieves the energy saving effect with the oxygen utilization efficiency increases with effect. In addition, an air diffuser that blows air with a blower is disposed at a relatively shallow water depth position of the upflow portion, and a large bubble larger than a millibubble is diffused to form a circulation flow by an air lift effect. When combined with the flow generation means, the activated sludge mixed water at the bottom of the tank is fed in the direction of the water surface, so that solids do not stay on the bottom of the tank, and a circulating flow is formed throughout the aerobic reaction tank. Therefore, even if the required power of the blower is small, an effective circulating flow can be formed and good solid-liquid contact can be achieved, so that a good water purification effect is achieved. In addition, the fine bubbles below the microbubbles such as nitrogen gas other than oxygen consumed mostly in the downflow part are taken in the large bubbles above the millibubbles and rise integrally, so that the fine bubbles adhere to the fine solids. In addition, it works to increase the upward flow and contributes greatly to the formation of a circulating flow, and has an energy saving effect. In addition, as a circulating flow production | generation means, there exists an effect similar to the said circulation flow production | generation means also by arrange | positioning the underwater mixer or pump which forms the circulation flow of a water surface direction.

In particular, when the submerged mixer is disposed in the upflow portion, the discharge flow rate by the submersible mixer in the submerged mixer portion is higher than the upflow velocity other than the submersible mixer portion in the upflow portion. , Forming a decompression basin, becoming a cavitation state, nitrogen gas other than most consumed oxygen is bubbled and degassed and becomes an energy source of upward flow, so that fine bubbles rapidly grow into large bubbles Therefore, as deaeration progresses, it becomes an energy source of the circulating flow, and has an energy saving effect.

Moreover, since the equipment capacity of the aerobic reaction tank, which is highly concentrated wastewater, can be reduced by increasing the reactivity of oxygen gas, the construction cost of the treatment facility can be reduced.

Further, in the treated water in the aerobic reaction tank, a single or any plurality of draft tubes having a lower opening and an upper opening with a solid-liquid separation membrane installed therein are disposed, and the inside of the draft tube An air diffuser that blows air or oxygen sent from a blower or the like in the direction of the water surface below the solid-liquid separation membrane has a water inlet at the water level near the bottom of the aerobic reaction tank. A microbubble generator or nanobubble generator equipped with atmospheric self-priming means is arranged in the middle or at the tip of the water pipe to eject the discharge port toward the water surface, and relatively from the air diffuser. If large bubbles and microbubbles from the microbubble generator or nanobubbles from the nanobubble generator are configured to rise along the surface of the solid-liquid separation membrane, a strong upward flow may occur depending on the air diffuser. Depending on the microbubble generator or nanobubble generator, a large number of independent microbubbles or nanobubbles with a high negative charge amount are generated on the surface, so that water bubbles are accumulated on the surface of the solid-liquid separation membrane. By neutralizing the positive charge of the obstacle solids, the obstacle solids are easily peeled off from the surface of the solid-liquid separation membrane. Therefore, a strong turbulent flow occurs in the treated water near the solid-liquid separation membrane between the bubbles above the millibubbles of the air diffuser and the microbubbles of the microbubble generator or the nanobubbles of the nanobubble generator, and the obstacle The solid material is easily peeled and removed. Furthermore, since the oxygen required by the microorganisms in the deepened aerobic reaction tank is supplied by the microbubble generator or nanobubble generator that generates microbubbles or nanobubbles having a high oxygen utilization rate, oxygen with a small required power is required. There is an effect of increasing the use efficiency. In addition, the solid matter in the treated water forms an effective circulation flow that does not cause stagnant sedimentation of the solid matter by the air diffuser disposed at a relatively shallow depth in the draft tube. However, it has the effect of becoming a small, energy-saving circulating fluid power source. In addition, as a circulating flow production | generation means, there exists the same effect also with an underwater mixer or a circulation pump.

In addition, an inflow port is provided in the bottom water of the reaction tank having a long and narrow cross-sectional area so that the vertical downward flow velocity in the transverse section has a substantially uniform distribution with an ultraviolet lamp. At the same time, a water absorption pipe is connected to the suction side of the circulation pump, and a microbubble generator or nanobubble generator equipped with ozone self-priming means is disposed at the tip of the water supply pipe connected to the discharge side of the circulation pump. Then, by disposing the discharge port of the microbubble generator or nanobubble generator below the water surface of the reaction tank and in a shallow water depth position downward to form a circulating flow and to serve as a water quality purification means, The microbubbles generated by the microbubble generator or the nanobubbles generated by the nanobubble generator have a large surface area of single bubbles and an extremely low ascending force in water, so they dissolve in water in a short time. Further, in the reaction vessel was high depth of achieves the energy saving effect with the oxygen utilization efficiency increases with the oxygen solubility is enhanced effect.

Also, since the microbubbles of the microbubble generator or the nanobubbles of the nanobubble generator are extremely small, when dissolved in water in a short time, the water has a high degree of transparency and easily transmits ultraviolet rays, and crosses the reaction vessel. Due to the elongated shape with the smallest possible area, the ultraviolet rays are effectively projected onto the water to be treated that dissolves ozone that passes near the location of the ultraviolet lamp, and the OH radicals are effective through hydrogen peroxide. Therefore, it is possible to effectively decompose and remove organic solids such as activated sludge and hardly decomposable harmful chemical substances in the water to be treated.

Further, by adopting an elongated shape in which the cross-sectional area of the reaction tank is made as small as possible, it is possible to generate a good circulation flow without generating a stagnant water area in the reaction tank and to reduce the installation space.

Further, a water suction pipe and a water supply pipe are connected to the water supply side and the discharge side of the circulation pump, and a water flow increasing means connected to the water inlet of the water suction pipe disposed at a deep water depth position and the tip of the water supply pipe is connected. By disposing the circulation pump at the same height as the discharge port, the water pressure acting on the suction side and the discharge side of the circulation pump cancel each other out. It is not necessary to include the head, and only the friction head and the speed head are included in the head, so that an extremely large energy saving effect is achieved.

Compared to the case where the air intake of the air self-priming means is connected to the outlet of the blower or the outlet of the ozone generator, and the air intake of the air self-priming means is opened to the atmosphere, a large amount of air or When ozone is sucked in, if a large amount of air or ozone needs to be diffused, the power is slightly increased compared to when the air intake of the air self-priming means is opened to the atmosphere. Therefore, the necessary air volume can be secured.

In addition, a water inlet is connected to the suction side of the circulation pump that circulates the water in the organic wastewater aerobic reaction tank, and the air itself is connected to the middle or tip of the water pipe connected to the discharge side of the circulation pump. Dispose the discharge port of the gas-liquid two-phase flow sending means constructed by communicating with the bubble generating device that generates bubbles larger than millibubble equipped with suction means at the lower water depth position of the contact material or solid-liquid separation membrane. When the bubbling cleaning means for the contact material or the solid-liquid separation membrane is used, it is not necessary to provide a blower or the like in the contact aeration tank or the solid-liquid separation membrane tank. In addition, since a microbubble generator and a bubble generator that generates bubbles larger than a millibubble can be provided, the equipment cost is small and energy is saved.

It is a schematic explanatory drawing of the water purification apparatus which shows the 1st Example of 1st invention. It is a schematic explanatory drawing of the bubble production | generation apparatus 10 of FIG. It is a schematic explanatory drawing of the water purification apparatus which shows the 1st Example of 2nd invention. It is a schematic explanatory plan view of AA view shown in FIG. It is a schematic explanatory drawing of the water purification apparatus which shows the 2nd Example of 2nd invention. FIG. 6 is a schematic explanatory plan view taken along the line B-B shown in FIG. 5. It is a schematic explanatory drawing of the water purification apparatus which shows the 3rd Example of 2nd invention. It is a schematic explanatory drawing of the water purification apparatus which shows the 1st Example of 3rd invention. It is a schematic explanatory plan view of CC view shown in FIG. It is a schematic explanatory drawing of the water purification apparatus which shows 1st Example of 4th invention. It is a schematic explanatory drawing of the water purification apparatus which shows 1st Example of 5th invention. It is a schematic explanatory drawing of the water purification apparatus which shows 1st Example of 6th invention. It is a schematic explanatory drawing of the water purification apparatus which shows 1st Example of 7th invention. It is a schematic explanatory drawing of the water purification apparatus which shows the 2nd Example of 7th invention.

  Embodiments of the present invention will be described with reference to FIGS.

  In the first embodiment of the first invention shown in FIGS. 1 and 2, the pipe diameter (hereinafter referred to as the diameter of the circulation pump 3) on the water absorption side of the circulation pump 3 disposed in the floating tank 2 equipped with the float 1. The same applies to the first embodiment), and one end of the water absorption pipe 4 is connected in communication, and the water absorption opening 4b, which is the other end of the water absorption pipe 4, is passed through the screen 5 to the water layer under the water surface where the sea bream has grown and free from suspended matter. The water suction port 4b for absorbing water is disposed, and a water supply pipe 6 having a pipe diameter larger than the diameter of the circulation pump 3 (same in the following embodiments) is connected to the water discharge side of the circulation pump 3 and connected. In the middle of the water supply pipe 6, a spherical body 7 as a flow velocity increasing means is disposed to provide a microbubble generator 9 for generating a static pressure decreasing flow area 8, and the flow velocity is reduced with respect to the self-priming air flow. Smooth tube wall with large pipe diameter and small friction coefficient A gas-liquid two-phase flow in which air is sucked into the static pressure-reducing flow region 8 via the air chamber 11 by a plastic air self-priming tube 10 (hereinafter the same) and dispersed and mixed as microbubbles in the static pressure-reducing flow region 8 When water is supplied, as the gas-liquid two-phase flow descends, the bubble size of the microbubbles decreases and dissolves in water in a short time, and dissolved oxygen-containing water is discharged from the discharge port 6a of the water supply pipe 6 to the oxygen-poor state. It erupts into the water layer. The material of the air self-priming tube 10 may be made of other materials such as a stainless steel tube and a plastic hose as long as it has a smooth tube wall (the same applies to the following embodiments). A flow rate adjustment valve 12 is connected to the atmospheric self-priming pipe 10. Note that the total area of many small holes (not shown) for introducing the self-adsorbed air from the air chamber 11 to the static pressure reducing flow area is sufficient to obtain a required amount of self-adsorbed air (the following examples) But the same). And the circulation pipe 13 is comprised by the said water absorption pipe 4, the water supply pipe 6, etc. FIG. On the other hand, at a relatively shallow water depth position in the draft tube 14 composed of the slide-type inner tube 14a and the outer tube 14b that can be expanded and contracted so that the water inlet can be selectively disposed in the water temperature layer. A water quality purification device 17 is configured by arranging a diffuser 16 for diffusing the air supplied by the blower 15 to generate a circulating flow. In addition, the expansion / contraction operation of the draft tube 14 is operated by the lifting device 18. Then, the water pumped up by the density difference head energy inside and outside the draft tube 14 is ejected in a gas-liquid two-phase flow together with the bubbles diffused from the diffuser 16, and the bubble diameter is further increased. Ascending surrounding water, it rises and forms a circulating flow. The weight 19 balances the levitation tank 2 against wind and waves, and the anchor 20 prevents the outflow. In the present embodiment, the spherical body 7 is disposed in the static pressure decreasing flow area 8 as a flow velocity increasing means. However, as the flow velocity increasing means, other gas-liquid such as an orifice, a venturi tube, an aspirator, etc. Any device equipped with gas self-priming means such as a two-phase fluid mixing / shearing method or a high-speed rotating method can be used. (The same applies to the following examples).

In the first embodiment of the second invention shown in FIGS. 3 and 4, the aeration tank 21 of the activated sludge method is partitioned by a partition wall 22 having flow openings 22a and 22b in the vicinity of the water surface and in the vicinity of the tank bottom. One end of a water absorption pipe 4 having a diameter larger than the diameter of the circulation pump 3 is connected to the water absorption side of the circulation pump 3 and communicates with the other side of the water absorption pipe 4. A water suction port 4b as an end is disposed below the water surface of the upward flow portion 21b, and a water supply pipe 6 having a diameter larger than the diameter of the circulation pump 3 is connected to the water discharge side of the circulation pump 3 and is connected to the water discharge pipe 6b. At the tip of the water supply pipe 6, a microbubble generator 9 in which an atmospheric self-priming pipe 10 provided with a flow rate adjusting valve 12 is connected in communication is provided. The air self-priming pipe 10 is made of a plastic with a smooth pipe wall having a large pipe diameter and a small friction coefficient in order to reduce the flow velocity with respect to the self-priming air flow. The material is not limited to plastic, and may be made of stainless steel. Then, the atmospheric self-priming pipe 10 sucks the atmosphere into the static pressure reducing flow area 8 via the air chamber 11, and the gas-liquid two-phase flow dispersed and mixed as bubbles in the static pressure reducing flow area 8 passes through the water supply pipe 6. By way of this, in combination with water absorption from the water inlet 4b of the water absorption pipe 4, a circulation flow is formed in the tank. On the other hand, an air diffuser 16 for diffusing the air supplied by the blower 15 is disposed at a relatively shallow depth in the draft tube 14 constituted by the partition wall 22 and the aeration tank 21 to generate a circulating flow. The water purification apparatus 17 is configured as described above. The number of rows of the microbubble generator 9 and the air diffuser 16 arranged in the downflow portion 21a and the upflow portion 21b is shown in two rows, but the number of rows is as required. Selected. In the present embodiment, the descending flow portion 21a and the ascending flow portion 21b are arranged one by one. However, the ascending flow portion 21b is arranged at the center, and both sides or The downflow part 21a can also be disposed on four sides.

In the second embodiment of the second invention shown in FIGS. 5 and 6, in the direction of the water surface, instead of the air diffuser 16 that diffuses the air sent by the blower 15 shown in FIGS. 3 and 4. An underwater mixer 23 for generating an upward flow of is provided.

In the third embodiment of the second invention shown in FIG. 7, in the aerobic contact aeration tank 26 disposed after the contaminant removal tank 24 and the anaerobic filter bed tank 25, the water absorption side of the circulation pump 3 Further, one end of a water suction pipe 4 having a diameter larger than the diameter of the circulation pump 3 is connected in communication, and a water suction port 4b which is the other end of the water suction pipe 4 is arranged near the bottom of the aerobic contact aeration tank 26. A water supply pipe 6 having a diameter larger than the diameter of the circulation pump 3 is connected to the water discharge side of the circulation pump 3 and a flow rate adjusting valve 12 is provided at the tip of the water supply pipe 6. The above-mentioned air self-priming pipe made of plastic with a smooth pipe wall having a small pipe diameter and a small friction coefficient in order to reduce the flow velocity with respect to the self-priming air flow by disposing the microbubble generator 9 connected to the suction pipe 10 10 sucks the atmosphere into the microbubble generator 9 The gas-liquid two-phase flow generated in this manner is ejected from the microbubble generator 9. On the other hand, an air diffuser 16 for diffusing the air sent by the blower 15 is arranged at a relatively shallow water depth position in the draft tube 14 constituted by the partition wall 22 and the contact material support wall 27 to thereby circulate the circulation flow. The water purification device 17 is configured so as to be generated.

In the first embodiment of the third invention shown in FIG. 8 and FIG. 9, a solid-liquid membrane separation tank 28 is disposed after the aeration tank 21 of the activated sludge method with increased water depth, In the aeration tank 21 of the activated sludge method, the upflow part 21b is partitioned at the center by dividing it by two partition walls 22A and 22B having flow openings 22a and 22b in the vicinity of the water surface and the vicinity of the tank bottom. Downflow portions 21a are formed on both sides, and are composed of a dissolved oxygen supply means composed of a circulation pump 3, a water absorption pipe 4, a water supply pipe 6, a microbubble generator 9 and the like, and the two partition walls 22A and 22B. The air diffuser 16 for diffusing the air sent by the blower 15 is disposed at a relatively shallow depth in the draft tube 14, and the circulation flow generating means is the same as that shown in FIGS. The configuration is as follows. The solid-liquid membrane separation tank 28 placed behind the activated sludge aeration tank 21 is provided with a draft tube 29 in the center having an upper opening 29a and a lower opening 29b, and the draft tube 29 allows the activated sludge floating mixed water to flow from the outside to the inside of the draft tube 29. Then, the water absorption pipe 4 constituting the circulation pipe 13 is connected to the circulation pump 3 at the lower stage immediately below the solid-liquid separation membrane module 30 disposed at the upper part of the draft tube 29, and the water suction port 4b is connected to the solid-liquid membrane. Disposed near the bottom of the separation tank 28 and at the tip of the water supply pipe 6 constituting the circulation pipe 13, the discharge port 9 a of the microbubble generator 9 is disposed upward, and the solid-liquid separation membrane module 2 An air diffuser 16 for diffusing the air sent by the blower 15 is disposed immediately above the upper stage to scrub the solid-liquid separation membrane module 30 and to form a circulation flow in the solid-liquid membrane separation tank 28. Yes. It should be noted that the membrane surface backwashing with the treatment liquid, the chemical liquid washing with sodium hypochlorite aqueous solution and the like, and the concentrated activated sludge mixed water of the solid-liquid membrane separation tank 28 are mixed with the contaminant removal tank and the activated sludge process. An apparatus for returning to the aeration tank 21, a membrane filtration treated water piping system, and the like are provided, but are not shown.

In the first embodiment of the fourth invention shown in FIG. 10, in the reaction tank 31 for decomposing the hardly decomposable organic matter such as dyeing waste water, the circulation pipe 13 constituted by the water absorption pipe 4 and the water supply pipe 6, etc., the circulation pump 3. A water feed pump 32 and an ultraviolet lamp 33 are provided, and the water suction port 4a of the water suction pipe 4 is connected to the tank bottom 31a so as to be downstream of the circulation pump 3 and the water feed pump 32, and the circulation The tip of the water supply pipe 6 where the water discharged from the pump 3 and the water supply pump 31 merges is connected through the tank top plate 30b and the microbubble generator 9 is disposed downward at the tip of the water supply pipe 6. is doing. The microbubble generator 9 self-sucks ozone from the ozone generator 34. The reaction tank 31, the circulation pipe 13, the circulation pump 3, the water pump 32, the ultraviolet lamp 33, and the like constitute a reaction treatment device 35, and the number of installed sets of the reaction treatment devices 35 is the quality of the water to be treated. And the required wastewater quality of the treated water.

In the first embodiment of the fifth invention shown in FIG. 11, at the tip of the water suction pipe 4 that is connected to the water suction side of the circulation pump 3, the diameter of the water suction side of the circulation pump 3 toward the upstream side of the circulation flow. An enlarged opening 36 having a greatly enlarged opening is formed, and then a circulating flow energy recovery device 38 is connected to the water absorption pipe 4 through a flow passage cross-sectional area enlarged portion 37. That is, the streamline energy of the circulating flow is converged to increase the velocity energy, and the increased velocity energy is converted into pressure energy. Connect to the water inlet of the circulation pump. In addition, since the cross-sectional area of the enlarged opening portion 35 in which the inlet is opened and immersed in the downstream side of the circulation flow toward the upstream side is larger than the cross-sectional area of the circulation pipe 13 on the downstream side, the circulation pump direction Work as a self-priming force.

In the first embodiment of the sixth invention shown in FIG. 12, a blower 15 is connected to the atmospheric self-priming side of the atmospheric self-priming tube 10.

In the first embodiment of the seventh invention shown in FIG. 13, as an alternative to the air diffuser 16 shown in FIG. 7, the generation of millibubbles connected to the downstream end of the water supply pipe 6 connected to the discharge side of the circulation pump. In addition to the device 39, as an alternative to the backwashing device, a millibubble generator 39 connected to the downstream end of the water supply pipe 6 connected to the discharge side of the circulation pump is provided. The opening / closing operation of the electromagnetic valve 40 is performed when the millibubble generator 39 disposed in the draft tube and the microbubble generator 9 disposed in the aerobic aeration tank 26 are operated. The device 39 is controlled by a timer (not shown) so as to stop the operation. When the millibubble generator 39 for backwashing is operated, the millibubble generator 39 provided in the draft tube and the microbubble generator 9 provided in the aerobic aeration tank 26 are deactivated. In this way, control is performed by a timer not shown.

In the second embodiment of the seventh invention shown in FIG. 14, as an alternative to the air diffuser 16 in FIG. 8, the millibubble generator 39 connected in communication with the downstream end of the water supply pipe 6 connected to the discharge side of the circulation pump. In addition, as an alternative to the diffuser disposed at the lower water level position of the solid-liquid separation membrane module, a millibubble generator 39 connected in communication with the downstream end of the water supply pipe 6 connected to the discharge side of the circulation pump is disposed. is doing.

  A suction pipe with an inlet immersed under the surface of a closed dam reservoir, lake, marine, etc. is connected to the suction side of the circulation pump, and the discharge port is connected to the ox reservoir, lake, marine area, etc. And a microbubble generator or nanobubble generator equipped with an atmospheric self-priming pipe is connected to the middle or tip of the water pipe of the circulation pump to self-suck the atmosphere and jet into the anoxic water mass of the bottom water layer It is possible to suppress the growth of the generated sea cucumber and supply dissolved oxygen to the anoxic water mass in the bottom water layer. Also, sterilization of water and food, decolorization of colored wastewater, liquefaction of excess sludge such as activated sludge to facilitate aerobic biological treatment such as activated sludge method, and decomposition and removal of refractory organic substances such as chlorofluorocarbon and PCB Available. In addition, high-load aerobic biological treatment of high-concentration wastewater can be performed. Furthermore, in order to maintain a stable filtration function over a long period of time, the separation membrane surface is a turbulent flow formed by a gas-liquid two-phase flow containing microbubbles or nanobubbles and a relatively large bubble larger than a millibubble. Wash.

DESCRIPTION OF SYMBOLS 1 Float 2 Floating tank 3 Circulation pump 4 Water absorption pipe 4b Water absorption port 5 Screen 6 Water supply pipe 7 Spherical object 8 Static pressure reduction flow area 9 Microbubble generator 10 Atmospheric self-priming pipe 11 Air chamber 12 Flow control valve 13 Circulation pipe 14 Draft tube 15 Blower 16 Aeration device 17 Water purification device 18 Lifting device 19 Weight 20 Anchor 21 Aeration tank 22a, 22b Flow opening 22, 22A, 22B Partition wall 21a Downflow part 21b Upflow part 23 Underwater mixer 24 Contaminant removal tank 25 Anaerobic filter bed Tank 26 Aerobic contact aeration tank 27 Contact material support wall 28 Solid-liquid membrane separation tank 29a, Upper opening 29b Lower opening 29 Draft tube 30 Solid-liquid separation membrane module 31 Reaction tank 32 Water supply pump 33 Ultraviolet lamp 31a Tank bottom 31b Tank top plate 34 Ozone generator 35 Reaction processor 36 Expanded opening Section 37 Channel cross-sectional area expansion section 38 Circulating flow energy recovery device 39 Millibubble generator 40 Solenoid valve

Claims (7)

A water absorption pipe and a water supply pipe are connected to a circulation pump to circulate water in the same water area, and a water supply port of the water absorption pipe is immersed in a shallow water layer below the surface of the water. The microbubble generator or nanobubble generator equipped with the atmospheric self-priming means is connected in communication, and the circulating flow generating means for generating the circulating flow of the high-water deep water and the surface water is disposed. Water purification equipment.   In an aeration tank provided with a partition plate having an opening at the bottom of the tank and a water surface part and having an upflow part and a downflow part, the inlet is immersed in a shallow water layer position below the water surface of the upflow part and absorbs water. Connect the pipe to the suction side of the circulation pump and connect the microbubble generator or nanobubble generator equipped with atmospheric self-priming means to the middle or tip of the water supply pipe connected to the discharge side of the circulation pump. Disposed at the shallow water layer position below the water surface of the downward flow portion is a downwardly configured discharge port configured to be microbubble dissolution water supply means or nanobubble dissolution water supply means, and disposed in the upflow portion, 2. The water purification apparatus according to claim 1, further comprising a circulating flow generating means for generating a circulating flow of the upflow portion and the downflow portion. In the treated water in the aerobic reaction tank, one or any plurality of draft tubes having a lower opening and an upper opening with a solid-liquid separation membrane installed therein are disposed, and the inside of the draft tube, Below the solid-liquid separation membrane, an air diffuser that blows air sent from a blower or the like in the direction of the water surface is arranged in the upper stage, and in the lower stage is a circulation pipe in which a water absorption pipe and a water supply pipe are arranged in a circulation pump A relatively large bubble from the air diffuser and the microbubble generator by disposing a microbubble generator or nanobubble generator equipped with atmospheric self-priming means in the middle or at the tip of the water pipe of the means 3. The water purification method according to claim 2, further comprising circulating flow generation means for raising microbubbles or nanobubbles from the nanobubble generating device along the surface of the solid-liquid separation membrane and forming a circulating flow. Location.   An ultraviolet ray lamp is provided, and an inlet is provided in the bottom water of the reaction tank having a long and narrow cross-sectional area so that the vertical downward flow velocity in the cross section has a substantially uniform distribution, and water absorption Connect the pipe to the suction side of the circulation pump, and connect the microbubble generator or nanobubble generator equipped with ozone self-priming means in the middle or at the tip of the water pipe connected to the discharge side of the circulation pump. The discharge port of the microbubble dissolution water supply means or nanobubble dissolution water supply means configured as described above is disposed below the water surface of the reaction tank and directed downward at a shallow water depth to form a circulating flow. 2. The water purification apparatus according to 2. The speed energy increasing means for converging the circulating flow energy by the streamline converging means of the circulating flow and the pressure energy increasing means for converting the speed energy into pressure energy are connected in communication with the water inlet of the circulation pump. , 2, 3 or 4. Water purification device. The microbubble generator or nanobubble generator equipped with air or ozone self-priming means, wherein the air or ozone self-priming means is connected to air supply means such as a blower or a compressor. The water purification apparatus according to 3, 4, or 5. A water inlet is connected to the suction side of the circulation pump that circulates water in the organic wastewater aerobic reaction tank, and an air self-priming means is provided in the middle or at the tip of the water pipe connected to the discharge side of the circulation pump. Dispose the discharge port of the gas-liquid two-phase flow delivery means constructed by communicating and connecting the equipped millibubble generator or centimeter bubble generator at the lower water depth position of the contact material or solid-liquid separation membrane, A water purification apparatus for cleaning a solid-liquid separation membrane.

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