Recycling device for comprehensive treatment of aquaculture wastewater

Abstract

The invention provides a recycling device and method for comprehensive treatment of aquaculture wastewater, the recycling device comprises a pretreatment tower, a bio-membrane reactor and a purification column reactor, the top end of the pretreatment tower is communicated with an aquaculture wastewater pipe through an outer spiral pipe, and the outer spiral pipe is provided with a dosing port; the bottom end of the pretreatment tower is communicated with the bio-membrane reactor, the top end of the bio-membrane reactor is communicated to the bottom end of the purification column reactor through a conveying pipe, the conveying pipe is provided with a conveying pump, the top end of the purification column reactor is communicated with a drainage pipe, and the drainage pipe is communicated with the outer spiral pipe through a circulating pipe; a plurality of water quality detection sensors are arranged at the top end of the purification column reactor. The aquaculture wastewater is subjected to three-stage treatment, suspended solids, carbon, nitrogen and phosphorus pollutants and refractory organics in the wastewater are sequentially removed, efficient cooperative treatment of the wastewater is achieved, and the treatment efficiency is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater recycling facilities, and particularly relates to a recycling device and method for comprehensive treatment of aquaculture wastewater. BACKGROUND

[0002] With the development of the scale and intensification of the aquaculture industry, a large amount of wastewater rich in organic matter, nitrogen, phosphorus and suspended solids generated in the process of aquaculture has become an important factor of water environmental pollution. The traditional treatment processes such as sedimentation tank, ordinary biological filter or single chemical oxidation method generally have problems of low treatment efficiency, large land occupation, high operation cost, large fluctuation of effluent water quality and the like, and are difficult to meet the increasingly strict environmental protection discharge standards and the demand of water resource recycling.

[0003] In recent years, although some researches have tried to combine cyclonic separation, biological membrane method and advanced oxidation technology for aquaculture wastewater treatment, there are still the following technical bottlenecks: the micro-fine particles and colloidal substances are not completely removed in the physical pretreatment stage, which easily causes the subsequent biological membrane to be blocked; the microbial community structure is single or the spatial distribution is unreasonable in the biological reactor, which limits the denitrification and phosphorus removal efficiency; the biological membrane is easily aged and scaled, and lacks cleaning mechanism; the gas-liquid mass transfer efficiency is low in the advanced oxidation unit, and the catalyst is easily deactivated. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a recycling device and method for comprehensive treatment of aquaculture wastewater, which can solve the problems of the prior art.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a recycling device for comprehensive treatment of aquaculture wastewater, characterized in that it comprises a pretreatment tower, a biological membrane reactor and a purification column reactor, the top end of the pretreatment tower is connected to an aquaculture wastewater pipe through an outer spiral pipe, a dosing port is arranged on the outer spiral pipe, and a disinfectant can be added, the bottom end of the pretreatment tower is connected to the biological membrane reactor, the top end of the biological membrane reactor is connected to the bottom end of the purification column reactor through a conveying pipe, a conveying pump is arranged on the conveying pipe, the top end of the purification column reactor is connected to a drain pipe, the drain pipe is connected to the outer spiral pipe through a circulating pipe, a circulating pump is arranged on the circulating pipe, and a plurality of water quality detection sensors are arranged on the top end of the purification column reactor to detect the water quality of the wastewater discharged from the purification column reactor.

[0006] The water flow entering the pretreatment tower is rotated by the outer spiral pipe, the suspended solids in the aquaculture wastewater are removed by the pretreatment tower, the carbon, nitrogen and phosphorus pollutants in the aquaculture wastewater are removed by the biofilm reactor, and the refractory organic matter in the aquaculture wastewater is removed by the purification column reactor.

[0007] The treated sewage is discharged through the drain pipe to the reclaimed water station, and the untreated sewage can be transported to the pretreatment tower by the circulating pump for continuous treatment.

[0008] Preferably, the pretreatment tower comprises a tower body, the top end of the tower body is communicated with the outlet end of the spiral pipe, a vortex rod is vertically rotatably installed in the tower body, a Jiaolong blade is fixedly installed on the vortex rod, a vortex rod motor for driving the vortex rod to rotate is fixedly installed on the top end of the tower body, and a plurality of spiral blades are fixedly installed on the vortex rod.

[0009] The vortex rod motor drives the vortex rod to rotate, so that the Jiaolong blade and the spiral blade rotate, drive the water flow in the tower body to form a vortex, guide the water flow to spiral downward, and increase the circumferential speed.

[0010] Preferably, a fan blade is fixedly installed below the spiral blade on the vortex rod, the fan blade is composed of three centrosymmetric blades, and the spiral blade and the fan blade are installed in a staggered manner.

[0011] The fan blade rotates, can convert part of the axial kinetic energy into strong tangential kinetic energy, the symmetrical blades inhibit eccentric vortexes, form a stable central vortex core, the edges of the fan blade generate controllable trailing vortexes at the same time, promote the aggregation of micro-particles, the three-stage spiral blades and the fan blades form pulsating vortexes of acceleration-disturbance-reacceleration, and guide the water flow downward along the tower body.

[0012] The tower body is in the shape of an inverted cone, the radii of the plurality of spiral blades and fan blades decrease from top to bottom, the bottom end of the inverted cone is communicated with the biofilm reactor, and the formation of vortexes at the bottom of the tower body is promoted.

[0013] Preferably, an inverted-cone-shaped lining plate is fixedly installed in the tower body, filter hole plates are embedded on the side walls of the lining plate, and an ultrasonic module is arranged between the tower body and the lining plate. The ultrasonic module performs ultrasonic vibration on the lining plate, prevents micro-particles and suspended solids from adhering to the lining plate, filters large-particle impurities or viscous substances through the filter hole plates, the water flow in the tower body passes through the filter hole plates and is transported to the biofilm reactor through the pipeline, and the next step of treatment is performed.

[0014] Preferably, the biofilm reactor comprises a first barrel, a lower biofilm carrier layer, a middle biofilm carrier layer and an upper biofilm carrier layer are arranged in the first barrel, the microbial colonies in the lower biofilm carrier layer are heterotrophic bacteria and anaerobic bacteria, which can remove biodegradable COD, part of organic nitrogen, residual suspended solids (fine particles not completely removed from the cyclone tower), the microbial colonies in the middle biofilm carrier layer are nitrifying bacteria and nitrobacteria, which can remove NH4⁺-N (ammonia nitrogen) and residual biodegradable COD, the microbial colonies in the upper biofilm carrier layer are denitrifying bacteria and phosphorus accumulating bacteria, which remove dissolved phosphate and nitrate and convert them into N2, and a sewage outlet is arranged at the bottom end of the first barrel to discharge the sewage in the first barrel.

[0015] Preferably, a mounting column is vertically and fixedly mounted at the top end of the first barrel, three rotating drums are rotatably connected to the mounting column, the rotating drums are connected to the lower biofilm carrier layer, the middle biofilm carrier layer and the upper biofilm carrier layer one by one, and three driving mechanisms are arranged on the mounting column, which are used to drive the lower biofilm carrier layer, the middle biofilm carrier layer and the upper biofilm carrier layer to rotate respectively.

[0016] The driving mechanisms can drive the lower biofilm carrier layer, the middle biofilm carrier layer and the upper biofilm carrier layer to rotate respectively, and the old film on the biofilm carrier layer is stripped by the shear force between the water flow and the biofilm carrier layer, promoting the uniform growth of the new film.

[0017] The driving mechanisms can also be periodically reversed in time to strip the inert gas attached to the biofilm carrier layer. For example, the driving mechanisms are reversed for 5 minutes every 24 hours.

[0018] In this embodiment, the driving mechanism comprises a driving motor, the output shaft of the driving motor is drivingly connected with a planetary gear, the outer gear ring of the planetary gear is connected with the lower biofilm carrier layer, the middle biofilm carrier layer or the upper biofilm carrier layer, the driving motor and the planetary gear are fixedly connected with the rotating drum, a sealing ring is arranged between the outer gear ring and the rotating drum to prevent sewage from entering the rotating drum and affecting the operation of the driving mechanism, and the sun gear of the planetary gear is drivingly connected with the output shaft of the driving motor. The driving mechanism drives the lower biofilm carrier layer, the middle biofilm carrier layer and the upper biofilm carrier layer to rotate slowly.

[0019] Preferably, the purification column reactor comprises a second barrel, an inner spiral pipe in communication with the conveying pipe is fixedly arranged at the bottom end of the second barrel, a quartz catalytic pipe is vertically arranged at the middle position of the second barrel, and a plurality of ultraviolet lamp tubes are also vertically arranged in the second barrel, the ultraviolet lamp tubes are uniformly arranged outside the quartz catalytic pipe, the conveying pipe is in communication with the inner spiral pipe through a vertical pipe, and an ozone micro-bubble generator is arranged on the vertical pipe.

[0020] The ozone microbubble generator generates ozone microbubbles, which enter the second barrel along the inner spiral pipe with the sewage flow, and the ozone microbubbles are in full contact with the sewage in the inner spiral pipe, and the sewage flow spirally rises to strengthen the gas-liquid mass transfer.

[0021] The outer surface of the quartz catalytic pipe is coated with a TiO2 / graphene composite photocatalyst, and when the wastewater flows through the outer wall of the quartz catalytic pipe, the pollutants come into direct contact with the catalyst, and under the action of the ultraviolet light emitted by the ultraviolet lamp, the catalyst is activated to generate strong oxidizing hydroxyl radicals (-OH), which penetrate the quartz pipe and activate the catalyst on the pipe wall to generate -OH radicals, so that ozone and -OH radicals synergistically oxidize.

[0022] The "gas-liquid-solid" three-phase synergistic reaction interface is realized, that is, the gas phase: ozone microbubbles rise from the bottom and move spirally along the outer wall of the quartz pipe; the liquid phase: wastewater spirally flows through the outer wall of the pipe; and the solid phase: the catalyst is fixed on the pipe wall.

[0023] Preferably, a plurality of water quality detection sensors are arranged at the top of the purification column reactor, which are pH sensors, DO sensors, ammonia nitrogen sensors, nitrate sensors and turbidity sensors, for monitoring the water quality of the treated wastewater from multiple aspects.

[0024] A recycling method for comprehensive treatment of aquaculture wastewater, characterized by using the recycling device described above, comprising the following steps: S1, a disinfectant is added to the aquaculture wastewater through the dosing port, and the aquaculture wastewater enters the pretreatment tower through the outer spiral pipe to remove suspended solids in the aquaculture wastewater.

[0025] The vortex rod motor drives the vortex rod to rotate, so that the Jiaolong blades and the spiral blades rotate to drive the water flow in the tower body to form a vortex, guide the water flow to spiral downward, and increase the circumferential velocity.

[0026] The fan blades rotate, which can convert part of the axial kinetic energy into strong tangential kinetic energy, the symmetrical blades suppress eccentric vortexes to form a stable central vortex core, and the edges of the fan blades generate controllable trailing vortices to promote the aggregation of micro-particles.

[0027] The ultrasonic module performs ultrasonic vibration on the lining plate to prevent micro-particles and suspended solids from adhering to the lining plate, and large-particle impurities or viscous substances are filtered through the filter hole plate, and the water flow in the tower body passes through the filter hole plate into the pipeline and is delivered to the biofilm reactor for further treatment.

[0028] S2, the wastewater treated by S1 enters the biofilm reactor and flows upward in the biofilm reactor to remove carbon, nitrogen and phosphorus pollutants in the aquaculture wastewater.

[0029] The microbial colonies in the lower biofilm carrier layer of the biofilm reactor are heterotrophic bacteria and anaerobic bacteria, which can remove the biodegradable COD, part of the organic nitrogen and residual suspended solids (fine particles not completely removed from the cyclone tower).

[0030] The microbial colonies in the middle biofilm carrier layer of the biofilm reactor are nitrifying bacteria and nitrobacteria, which can remove NH4⁺-N (ammonia nitrogen) and residual biodegradable COD.

[0031] The microbial colonies in the upper biofilm carrier layer of the biofilm reactor are denitrifying bacteria and phosphorus accumulating organisms, which remove dissolved phosphate and nitrate and convert them into N2.

[0032] S3, the wastewater treated by S2 is input into the purification column reactor by a delivery pump and flows upward in the purification column reactor to remove refractory organic matter in the aquaculture wastewater.

[0033] The ozone microbubble generator generates ozone microbubbles, which enter the second barrel along the inner spiral pipe with the sewage flow, and the ozone microbubbles are in full contact with the sewage in the inner spiral pipe, and the sewage flow spirally rises to strengthen the gas-liquid mass transfer.

[0034] The outer surface of the quartz catalytic pipe is coated with a TiO2 / graphene composite photocatalyst, and when the wastewater flows through the outer wall of the quartz catalytic pipe, the pollutants directly contact the catalyst, and under the action of the ultraviolet light emitted by the ultraviolet lamp, the catalyst is activated to generate strong oxidizing hydroxyl radicals (-OH), and the strong oxidizing hydroxyl radicals (-OH) and ozone microbubbles penetrate the quartz pipe to activate the catalyst on the pipe wall to generate -OH radicals, so that ozone and -OH radicals synergistically oxidize.

[0035] S4, the wastewater treated by S3 is detected by a water quality detection sensor, and the wastewater meeting the detection requirements is discharged to a reclaimed water station through a drain pipe, and the wastewater failing to meet the requirements is delivered to the outer spiral pipe 4 for further treatment.

[0036] Compared with the prior art, the present application has the following advantages: 1、The present application carries out three-stage treatment on the aquaculture wastewater through the pretreatment tower, the biofilm reactor and the purification column reactor, and sequentially removes the suspended solids, carbon, nitrogen, phosphorus pollutants and refractory organic matter in the sewage, so that efficient and synergistic treatment of the sewage is realized, and the treatment efficiency is high.

[0037] 2、The pretreatment tower of the application introduces the rotating flow of sewage through the outer spiral pipe, forms the pulsating vortex of acceleration-disturbance-reacceleration through the three-stage spiral blade and fan blade, guides the water flow downward along the tower body, filters the large-particle impurities or viscous substances through the filter hole plate, and removes the suspended solids in the aquaculture wastewater.

[0038] 3、The biofilm reactor of the application removes the biodegradable COD, part of the organic nitrogen and residual suspended solids (fine particles not completely removed from the cyclone tower) in the sewage through the heterotrophic bacteria and anaerobic bacteria in the lower biofilm carrier layer, removes the NH4⁺-N (ammonia nitrogen) and residual biodegradable COD in the sewage through the nitrifying bacteria and nitrobacteria in the middle biofilm carrier layer, and removes the dissolved phosphate and nitrate in the sewage through the microbial colonies of denitrifying bacteria and phosphorus accumulating bacteria in the upper biofilm carrier layer, and converts them into N2, thereby removing the carbon, nitrogen and phosphorus pollutants in the sewage.

[0039] 4、The purification column reactor of the application emits ultraviolet rays through the ultraviolet lamp tube, irradiates the catalyst, activates the catalyst, generates strong oxidizing hydroxyl radicals (-OH), and makes the ozone microbubbles penetrate the quartz tube, activate the catalyst on the tube wall, generate -OH radicals, and make the ozone and -OH radicals synergistically oxidize, thereby removing the refractory organic matter in the sewage.

[0040] The application will be further described in detail below in combination with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of the application.

[0042] Figure 2 is a structural schematic diagram of the pretreatment tower in the application.

[0043] Figure 3 is a cross-sectional structural schematic diagram of the pretreatment tower in the application.

[0044] Figure 4 is an installation schematic diagram of the spiral blade and fan blade in the application.

[0045] Figure 5 is a structural schematic diagram of the biofilm reactor in the application.

[0046] Figure 6 is a partial perspective schematic diagram of the biofilm reactor in the application.

[0047] Figure 7 is an installation schematic diagram of the biofilm carrier layer in the application.

[0048] Figure 8 is a structural schematic diagram of the purification column reactor in the application.

[0049] Figure 9 is a partial perspective view of the purification column reactor in the present application.

[0050] Figure 10 is a schematic view of the installation of the quartz catalytic tube and the ultraviolet lamp tube in the present application.

[0051] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0052] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific details set forth herein without departing from the spirit and scope of the present application. Accordingly, the present application is not intended to be limited to the specific embodiments described below.

[0053] It is to be understood that where an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0054] As shown in Figures 1-10 The present application provides a comprehensive treatment and recycling device for aquaculture wastewater, which comprises a pretreatment tower 1, a biofilm reactor 2 and a purification column reactor 3. The top end of the pretreatment tower 1 is connected to an aquaculture wastewater pipe through an outer spiral pipe 4. A dosing port 401 is provided on the outer spiral pipe 4, through which a disinfectant can be added. The bottom end of the pretreatment tower 1 is connected to the biofilm reactor 2. The top end of the biofilm reactor 2 is connected to the bottom end of the purification column reactor 3 through a delivery pipe 5. A delivery pump 501 is provided on the delivery pipe 5. The top end of the purification column reactor 3 is connected to a drain pipe 6, on which a drain pump is provided. The drain pump is used to extract treated wastewater that meets the standards. The drain pipe 6 is connected to the outer spiral pipe 4 through a circulation pipe 7. A circulation pump 701 is provided on the circulation pipe 7. The circulation pump is used to deliver wastewater that does not meet the standards after treatment to the outer spiral pipe 4 for further treatment. A plurality of water quality detection sensors are provided on the top end of the purification column reactor 3. The water quality detection sensors are used to detect the water quality of the wastewater discharged from the purification column reactor 3.

[0055] The water flow entering the pretreatment tower 1 is rotated by the outer spiral pipe 4, the suspended solids in the aquaculture wastewater are removed by the pretreatment tower 1, the carbon, nitrogen and phosphorus pollutants in the aquaculture wastewater are removed by the biofilm reactor 2, and the refractory organic matter in the aquaculture wastewater is removed by the purification column reactor 3.

[0056] The treated wastewater is discharged to the reclaimed water station through the drain pipe 6, and the untreated wastewater can be transported to the pretreatment tower 1 through the circulating pump 701 for further treatment.

[0057] In this embodiment, the pretreatment tower 1 comprises a tower body 101, the top end of the tower body 101 is communicated with the outlet end of the spiral pipe 4, a vortex rod 102 is vertically rotatably installed in the tower body 101, a Jiaolong blade is fixedly installed on the vortex rod 102, a vortex rod motor 103 for driving the vortex rod 102 to rotate is fixedly installed on the top end of the tower body 101, and a plurality of spiral blades 104 are fixedly installed on the vortex rod 102.

[0058] The vortex rod motor 103 drives the vortex rod 102 to rotate, so that the Jiaolong blade and the spiral blade 104 rotate, drive the water flow in the tower body 101 to form a vortex, guide the water flow to spiral downward, and increase the circumferential speed.

[0059] In this embodiment, a fan blade 105 is fixedly installed below the spiral blade 104 on the vortex rod 102, the fan blade 105 is composed of three centrosymmetric blades, and the spiral blade 104 and the fan blade 105 are installed in a staggered manner.

[0060] The fan blade 105 rotates, can convert part of the axial kinetic energy into strong tangential kinetic energy, the symmetrical blades inhibit eccentric vortexes, form a stable central vortex core, at the same time, the controllable trailing vortexes are generated at the edge of the fan blade 105, promote the aggregation of micro particles, the three-stage spiral blade 104 and the fan blade 105 form pulsating vortexes of acceleration-disturbance-reacceleration, and guide the water flow downward along the tower body 101.

[0061] The tower body 101 is in an inverted conical shape, the radii of the plurality of spiral blades 104 and fan blades 105 gradually decrease from top to bottom, and the bottom end of the inverted conical shape is communicated with the biofilm reactor 2, so as to promote the formation of vortexes at the bottom of the tower body 101.

[0062] In this embodiment, an inverted conical lining plate 106 is fixedly installed in the tower body 101, a filter hole plate 107 is embedded on the side wall of the lining plate 106, and an ultrasonic module is arranged between the tower body 101 and the lining plate 106. The ultrasonic module performs ultrasonic vibration on the lining plate 106, prevents micro particles and suspended solids from adhering to the lining plate 106, filters large particle impurities or viscous substances through the filter hole plate 107, and the water flow in the tower body 101 enters the pipeline to the biofilm reactor 2 through the filter hole plate 107 for next step treatment.

[0063] The pretreatment tower 1 significantly improves the removal efficiency of fine particles, colloids and viscous organic matters, and can effectively avoid the clogging of the biofilm reactor 2 by fine particles, colloids and viscous organic matters, and prolong the operation cycle of the system.

[0064] In this embodiment, the biofilm reactor 2 comprises a first barrel 201, and a lower biofilm carrier layer 202, a middle biofilm carrier layer 203 and an upper biofilm carrier layer 204 are arranged in the first barrel 201. The microbial colonies in the lower biofilm carrier layer 202 are heterotrophic bacteria and anaerobic bacteria, which can remove biodegradable COD, part of organic nitrogen and residual suspended solids (fine particles not completely removed from the cyclone tower). The microbial colonies in the middle biofilm carrier layer 203 are nitrifying bacteria and nitrobacteria, which can remove NH4⁺-N (ammonia nitrogen) and residual biodegradable COD. The microbial colonies in the upper biofilm carrier layer 204 are denitrifying bacteria and phosphorus accumulating bacteria, which remove dissolved phosphate and nitrate and convert them into N2. A sewage outlet is arranged at the bottom end of the first barrel 201 to discharge sewage in the first barrel 201.

[0065] The biofilm reactor 2 forms a spatially gradient microbial niche, realizes the zoned and directional conversion and efficient removal of carbon, nitrogen and phosphorus pollutants, and breaks through the bottleneck of the limited efficiency of traditional biological denitrification and phosphorus removal.

[0066] In this embodiment, a mounting column 205 is vertically and fixedly installed at the top end of the first barrel 201, and three rotating drums 206 are rotatably connected to the mounting column 205. The rotating drums 206 are connected to the lower biofilm carrier layer 202, the middle biofilm carrier layer 203 and the upper biofilm carrier layer 204 one by one. Three driving mechanisms 207 are arranged on the mounting column 205, and the driving mechanisms 207 are used to drive the lower biofilm carrier layer 202, the middle biofilm carrier layer 203 and the upper biofilm carrier layer 204 to rotate respectively.

[0067] The driving mechanisms 207 can drive the lower biofilm carrier layer 202, the middle biofilm carrier layer 203 and the upper biofilm carrier layer 204 to rotate respectively, and the old film on the biofilm carrier layer is stripped by the shear force between the water flow and the biofilm carrier layer, and the new film is promoted to grow uniformly.

[0068] The driving mechanisms 207 can also be periodically and timely reversed to strip the inert gas attached to the biofilm carrier layer. For example, the driving mechanisms 207 are reversed for 5 minutes every 24 hours.

[0069] In the embodiment, the driving mechanism 207 comprises a driving motor, an output shaft of the driving motor is drivingly connected with a planetary gear, an outer gear ring of the planetary gear is connected with the lower biofilm carrier layer 202, the middle biofilm carrier layer 203 or the upper biofilm carrier layer 204, the driving motor and a planetary carrier of the planetary gear are fixedly connected with the rotating drum 206, a sealing ring is arranged between the outer gear ring and the rotating drum 206 to prevent sewage from entering the rotating drum 206 and affecting the operation of the driving mechanism 207, and a sun gear of the planetary gear is drivingly connected with the output shaft of the driving motor. The driving mechanism 207 drives the slow rotation of the lower biofilm carrier layer 202, the middle biofilm carrier layer 203 and the upper biofilm carrier layer 204.

[0070] The periodic forward and reverse rotation of the biofilm carrier driven by the planetary gear set, in combination with the water flow shear force, realizes the automatic peeling of the aged biofilm and the uniform attachment of the new film, avoids the over-thickening of the film layer, the scaling or the accumulation of inert substances, and significantly improves the biofilm activity and the long-term operation stability of the system.

[0071] In the embodiment, the purification column reactor 3 comprises a second barrel body 301, an inner spiral pipe 302 in communication with the conveying pipe 5 is fixedly installed at the inner bottom of the second barrel body 301, a quartz catalytic pipe 303 is vertically arranged at the middle position in the second barrel body 301, a plurality of ultraviolet lamp tubes 304 are also vertically arranged in the second barrel body 301, the ultraviolet lamp tubes 304 are uniformly arranged outside the quartz catalytic pipe 303, the conveying pipe 5 is in communication with the inner spiral pipe 302 through a vertical pipe 305, and an ozone microbubble generator 306 is arranged on the vertical pipe 305.

[0072] The ozone microbubble generator 306 generates ozone microbubbles, the ozone microbubbles enter the second barrel body 301 along the inner spiral pipe 302 with the sewage flow, the ozone microbubbles are in full contact with the sewage in the inner spiral pipe 302, and the sewage flow spirally rises to strengthen the gas-liquid mass transfer.

[0073] The outer surface of the quartz catalytic pipe 303 is coated with a TiO2 / graphene composite photocatalyst, when the wastewater flows through the outer wall of the quartz catalytic pipe 303, the pollutants directly contact the catalyst, under the action of the ultraviolet irradiation of the ultraviolet lamp tube 304, the catalyst is activated to generate strong oxidizing hydroxyl radicals (-OH), the strong oxidizing hydroxyl radicals (-OH) penetrate the quartz pipe to activate the catalyst on the pipe wall to generate -OH radicals, so that the ozone and -OH radicals are cooperatively oxidized.

[0074] The "gas-liquid-solid" three-phase synergistic reaction interface is realized, that is, the gas phase: the ozone microbubbles rise from the bottom and spirally move along the outer wall of the quartz pipe; the liquid phase: the wastewater spirally flows through the outer wall of the pipe; and the solid phase: the catalyst is fixed on the pipe wall.

[0075] In this embodiment, a plurality of water quality detection sensors are arranged on the top end of the purification column reactor 3, which are pH sensor, DO sensor, ammonia nitrogen sensor, nitrate sensor and turbidity sensor, for monitoring the quality of the treated wastewater from multiple aspects.

[0076] A comprehensive treatment and recycling method for aquaculture wastewater, using the above-mentioned recycling device, comprising the following steps: S1, disinfectant is added to the aquaculture wastewater through the dosing port 401, and the aquaculture wastewater enters the pretreatment tower 1 through the outer spiral pipe 4 to remove suspended solids in the aquaculture wastewater through the pretreatment tower 1.

[0077] The vortex rod motor 103 drives the vortex rod 102 to rotate, so that the Jiaolong blade and the spiral blade 104 rotate to form a vortex in the water flow in the tower body 101, guide the water flow to spiral downward, and increase the circumferential velocity.

[0078] The fan blade 105 rotates, and part of the axial kinetic energy can be converted into strong tangential kinetic energy. The symmetrical blades suppress eccentric vortexes and form a stable central vortex core. At the same time, the fan blade 105 edge produces a controllable trailing vortex, which promotes the aggregation of micro-particles. The three-stage spiral blade 104 and the fan blade 105 form an accelerated-disturbance-reaccelerated pulsating vortex, which guides the water flow downward along the tower body 101.

[0079] The ultrasonic module vibrates the lining plate 106 to prevent micro-particles and suspended solids from adhering to the lining plate 106. Large-particle impurities or viscous substances are filtered through the filter hole plate 107. The water flow in the tower body 101 passes through the filter hole plate 107 and is conveyed to the biofilm reactor 2 through the pipeline for further treatment.

[0080] S2, the wastewater treated by S1 enters the biofilm reactor 2 and flows upward in the biofilm reactor 2. The carbon, nitrogen and phosphorus pollutants in the aquaculture wastewater are removed by the biofilm reactor 2.

[0081] The microbial colonies in the lower biofilm carrier layer 202 of the biofilm reactor 2 are heterotrophic bacteria and anaerobic bacteria, which can remove biodegradable COD, part of organic nitrogen and residual suspended solids (fine particles not completely removed by the cyclone tower).

[0082] The microbial colonies in the middle biofilm carrier layer 203 of the biofilm reactor 2 are nitrifying bacteria and nitrobacteria, which can remove NH4⁺-N (ammonia nitrogen) and residual biodegradable COD.

[0083] The microbial colonies in the upper biofilm carrier layer 204 of the biofilm reactor 2 are denitrifying bacteria and phosphorus accumulating organisms, which remove dissolved phosphate and nitrate and convert them into N2.

[0084] S3, the wastewater treated by S2 is input into the purification column reactor 3 by the delivery pump 501, and flows upward in the purification column reactor 3, and the refractory organic matters in the aquaculture wastewater are removed by the purification column reactor 3.

[0085] The ozone microbubble generator 306 generates ozone microbubbles, the ozone microbubbles enter the second barrel body 301 along the inner spiral pipe 302 with the sewage flow, the ozone microbubbles are in full contact with the sewage in the inner spiral pipe 302, the sewage flow spirally rises, and the gas-liquid mass transfer is strengthened.

[0086] The outer surface of the quartz catalytic pipe 303 is coated with a TiO2 / graphene composite photocatalyst, when the wastewater flows through the outer wall of the quartz catalytic pipe 303, the pollutants directly contact the catalyst, under the action of the ultraviolet light emitted by the ultraviolet lamp 304, the catalyst is activated, strong oxidizing hydroxyl radicals (-OH) are generated, the strong oxidizing hydroxyl radicals (-OH) penetrate the quartz pipe and activate the catalyst on the pipe wall to generate -OH radicals, so that the ozone and -OH radicals are cooperatively oxidized.

[0087] S4, the wastewater treated by S3 is detected by the water quality detection sensor, the qualified wastewater is discharged to the reclaimed water station through the drain pipe 6, and the unqualified sewage is delivered to the outer spiral pipe 4 for further treatment.

[0088] The above is only a preferred embodiment of the present application, and does not limit the present application. Any simple modification, change and equivalent change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. An integrated treatment and recycling device for aquaculture wastewater, characterized by, The application relates to an aquaculture wastewater treatment device, which comprises a pretreatment tower (1), a biofilm reactor (2) and a purification column reactor (3), the top end of the pretreatment tower (1) is connected with an aquaculture wastewater pipe through an outer spiral pipe (4), a dosing port (401) is arranged on the outer spiral pipe (4), the bottom end of the pretreatment tower (1) is connected with the biofilm reactor (2), the top end of the biofilm reactor (2) is connected with the bottom end of the purification column reactor (3) through a conveying pipe (5), a conveying pump (501) is arranged on the conveying pipe (5), the top end of the purification column reactor (3) is connected with a drain pipe (6), the drain pipe (6) is connected with the outer spiral pipe (4) through a circulating pipe (7), a circulating pump (701) is arranged on the circulating pipe (7), and a plurality of water quality detection sensors are arranged on the top end of the purification column reactor (3).

2. The device according to claim 1, wherein The pretreatment tower (1) comprises a tower body (101), the top end of the tower body (101) is connected with the outlet end of the spiral pipe (4), a vortex rod (102) is vertically rotatably arranged in the tower body (101), a plurality of Jiaolong blades are fixedly arranged on the vortex rod (102), a vortex rod motor (103) for driving the vortex rod (102) to rotate is fixedly arranged on the top end of the tower body (101), and a plurality of spiral blades (104) are fixedly arranged on the vortex rod (102).

3. The device according to claim 2, wherein A fan blade (105) is fixedly arranged below the spiral blade (104) and close to the spiral blade (104) on the vortex rod (102). The tower body (101) is in an inverted conical shape, the radii of the plurality of spiral blades (104) and fan blades (105) gradually decrease from top to bottom, and the bottom end of the inverted conical shape is connected with the biofilm reactor (2).

4. The device according to claim 3, wherein the device is characterized by, An inverted conical lining plate (106) is fixedly arranged in the tower body (101), a filter hole plate (107) is embedded on the side wall of the lining plate (106), and an ultrasonic module is arranged between the tower body (101) and the lining plate (106).

5. The device for comprehensive treatment and recycling of aquaculture wastewater according to claim 1, characterized in that, The biofilm reactor (2) comprises a first barrel body (201), a lower biofilm carrier layer (202), a middle biofilm carrier layer (203) and an upper biofilm carrier layer (204) are arranged in the first barrel body (201), the microbial colonies in the lower biofilm carrier layer (202) are heterotrophic bacteria and anaerobic bacteria, the microbial colonies in the middle biofilm carrier layer (203) are nitrifying bacteria and nitrifying bacillus, the microbial colonies in the upper biofilm carrier layer (204) are denitrifying bacteria and phosphorus accumulating bacteria, and a blowdown port is arranged at the bottom end of the first barrel body (201).

6. The device for comprehensive treatment and recycling of aquaculture wastewater according to claim 5, characterized in that, The first barrel body (201) is vertically fixedly installed with an installation column (205) at the top end, three rotating drums (206) are rotatably connected to the installation column (205), the rotating drums (206) are connected with the lower biofilm carrier layer (202), the middle biofilm carrier layer (203) and the upper biofilm carrier layer (204) one by one, and three driving mechanisms (207) are arranged on the installation column (205) and used for driving the lower biofilm carrier layer (202), the middle biofilm carrier layer (203) and the upper biofilm carrier layer (204) to rotate respectively.

7. The device according to claim 6, wherein The driving mechanism (207) comprises a driving motor, the output shaft of the driving motor is drivingly connected with a planetary gear, the outer gear ring of the planetary gear is connected with the lower biofilm carrier layer (202), the middle biofilm carrier layer (203) or the upper biofilm carrier layer (204), and the sun gear of the planetary gear is drivingly connected with the output shaft of the driving motor.

8. The device according to claim 1, wherein The purification column reactor (3) comprises a second barrel body (301), an inner spiral pipe (302) in communication with the conveying pipe (5) is fixedly installed at the bottom end in the second barrel body (301), a quartz catalytic pipe (303) is vertically arranged at the middle position in the second barrel body (301), a plurality of ultraviolet lamp pipes (304) are also vertically arranged in the second barrel body (301), the ultraviolet lamp pipes (304) are uniformly arranged outside the quartz catalytic pipe (303), the conveying pipe (5) is in communication with the inner spiral pipe (302) through a vertical pipe (305), and the ozone micro-bubble generator (306) is arranged on the vertical pipe (305).

9. The device according to claim 8, wherein The water quality detection sensor is a pH sensor, a DO sensor, an ammonia nitrogen sensor, a nitrate sensor and a turbidity sensor.

10. A comprehensive treatment and recycling method for aquaculture wastewater, characterized in that, The recycling device as claimed in any one of claims 1-9 is used, comprising the following steps: S1, disinfectant is added to the aquaculture wastewater through the dosing opening (401), and the aquaculture wastewater enters the pretreatment tower (1) through the outer spiral pipe (4) to remove the suspended solids in the aquaculture wastewater through the pretreatment tower (1); S2, the wastewater treated in S1 enters the biofilm reactor (2) to remove the carbon, nitrogen and phosphorus pollutants in the aquaculture wastewater through the biofilm reactor (2); S3, the wastewater treated in S2 is input into the purification column reactor (3) through the conveying pump (501) to remove the refractory organic matter in the aquaculture wastewater through the purification column reactor (3); S4, the wastewater treated in S3 is detected by the water quality detection sensor, the qualified wastewater is discharged to the reclaimed water station through the drain pipe (6), and the unqualified wastewater is conveyed to the outer spiral pipe (4) for continuous treatment through the circulating pump (701).

Images