Breeding wastewater treatment device

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to an aquaculture wastewater treatment device which comprises a grating pool, a transfer pool, an inclined plate screen solid-liquid separator, a drum screen and an AnMBR device, a submersible stirrer is mounted in the transfer pool, the transfer pool is respectively connected with the grating pool and the inclined plate screen solid-liquid separator, and the drum screen is connected with the AnMBR device. The inclined plate screen solid-liquid separator is respectively connected with the drum screen and the screw conveyer, the drum screen is respectively connected with the AnMBR device and the screw conveyer, the AnMBR device comprises an anaerobic reactor and a tubular membrane component which are connected with each other, the anaerobic reactor is connected with the boiler through a biogas tank, and the tubular membrane component is connected with the inclined plate screen solid-liquid separator. The anaerobic reactor is respectively connected with the inclined plate sieve solid-liquid separator and the biogas slurry box. According to the utility model, functional microorganisms are intercepted and returned into the anaerobic reactor by utilizing the tubular membrane component, so that the anaerobic biological treatment efficiency is improved; dry sludge is formed through extrusion of the screw conveyer, and the generated biogas slurry is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a breeding wastewater treatment device. Background Art

[0002] Anaerobic biological treatment is an efficient wastewater treatment method in which organic matter in wastewater is decomposed, metabolized and digested by anaerobic bacteria under anaerobic conditions, which greatly reduces the organic matter content in wastewater and produces biogas. Although anaerobic treatment technology has unmatched advantages over other water treatment processes, most existing anaerobic treatment technologies have problems such as serious anaerobic sludge loss, low pollutant removal rate, low organic load, and low gas production. There are a large number of nutrients and substances in aquaculture wastewater that need to be recycled. Utility Model Content

[0003] The utility model solves the problems in the related technology and proposes a breeding wastewater treatment device, which utilizes a tubular membrane component to efficiently separate pollutants, intercepts functional microorganisms and returns them to the anaerobic reactor, avoids the loss of microorganisms and strengthens the anaerobic environment, effectively separates insoluble substances and pollutants, and thus improves the efficiency of anaerobic biological treatment; the dry sludge formed by squeezing the screw conveyor can be directly used for fertilizing crops after aerobic treatment, and after combining with the anaerobic fermentation technology, the generated biogas can be directly irrigated to promote the growth of crops to reduce the amount of chemical fertilizers, and the biogas generated by anaerobic fermentation can be used as clean energy to reduce the consumption of other energy sources; in addition, the biogas contains a large amount of nutrients such as nitrogen and phosphorus, and its recycling treatment can avoid flowing into the water body and causing eutrophication and other problems.

[0004] In order to solve the above technical problems, the utility model is realized through the following technical scheme: an aquaculture wastewater treatment device, comprising a grille tank, a transfer tank, an inclined plate screen solid-liquid separator, a drum screen, and an AnMBR device, wherein a submersible agitator is installed in the transfer tank, the transfer tank is respectively connected to the grille tank and the inclined plate screen solid-liquid separator, the inclined plate screen solid-liquid separator is respectively connected to the drum screen and the screw conveyor, the drum screen is respectively connected to the AnMBR device and the screw conveyor, the AnMBR device comprises an anaerobic reactor and a tubular membrane assembly connected to each other, the anaerobic reactor is connected to a boiler through a biogas tank, and the anaerobic reactor is respectively connected to the inclined plate screen solid-liquid separator and the biogas tank.

[0005] As a preferred solution, a coarse grid and a fine grid are provided in the grid pool, and the grid pool is connected to the transfer pool through a first pipeline, and a valve is installed on the first pipeline.

[0006] As a preferred solution, the transfer tank is connected to the inclined plate screen solid-liquid separator via a water pump, and the drum screen is connected to the anaerobic reactor via a water inlet pump and a valve.

[0007] As a preferred embodiment, the anaerobic reactor is a fully mixed anaerobic reactor, which is equipped with an agitator, a temperature sensor, a liquid level controller, a pH meter, and a heating rod inside, and a wet gas flow meter and a PLC electric control cabinet outside; the anaerobic reactor is controlled by the PLC electric control cabinet; a closed hot water tank is installed on the anaerobic reactor, and the closed hot water tank is connected to the boiler, the biogas tank and the water production tank are both equipped with a high liquid level controller and a low liquid level controller, and the water production tank is also equipped with a medium liquid level controller.

[0008] As a preferred solution, it also includes a basket filter, which is installed on the water inlet main pipeline of the tubular membrane assembly.

[0009] As a preferred solution, it also includes a cleaning device, which includes a spherical tank box, a cleaning ball and a ball entry observation box. The spherical tank box is connected to the tubular membrane assembly. The ball entry observation box is connected to the spherical tank box through a cleaning pipe and a valve is installed on the cleaning pipe.

[0010] As a preferred solution, the cleaning device further comprises a dosing box, which is connected to the water inlet main pipeline via a dosing branch pipe, a valve is installed on the dosing branch pipe, and a circulation pump, a flow meter and a pressure gauge are installed on the water inlet main pipeline.

[0011] As a preferred solution, the biogas slurry tank and the produced water tank are connected to the water inlet main pipeline through a biogas slurry branch pipe and a produced water branch pipe respectively, and valves are installed on the biogas slurry branch pipe and the produced water branch pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The utility model introduces a tubular membrane component on the basis of traditional anaerobic biological treatment. Due to the interception effect of membrane separation on microorganisms, the sludge retention time (SRT) and hydraulic time (HRT) can be completely separated, and the sludge concentration of the system can be maintained at a high level. Therefore, compared with traditional anaerobic fermentation, the anaerobic membrane bioreactor of the utility model has the advantages of fast start-up, high pollutant removal rate, low sludge generation, small footprint and flexible operation and management, so that the entire system not only saves investment and energy consumption, but also can recycle biogas energy, has high organic load and is resistant to shock loads;

[0014] (2) In addition, it has the characteristics of good biochemical effect and stable water quality. The produced water can be used for daily cleaning of pipelines and pollutants suspended on the surface of tubular membrane modules;

[0015] (3) In addition, the physical method of cleaning balls can be continued to further alleviate the accumulation of pollution on the membrane surface, thereby reducing the number of chemical cleanings, effectively increasing the service life of the tubular membrane, reducing subsequent maintenance and replacement costs, and achieving deep cleaning through chemical cleaning;

[0016] (4) Aquaculture wastewater itself contains a large number of nutrients and substances. The dry sludge formed by squeezing the screw conveyor can be directly used for fertilizing crops after aerobic treatment. After combining with anaerobic fermentation technology, the generated biogas can be directly used to irrigate farmland to promote crop growth and reduce the amount of chemical fertilizers. The biogas generated by anaerobic fermentation can be used as clean energy to reduce the consumption of other energy sources. In addition, biogas contains a large number of nutrients such as nitrogen and phosphorus. Its recycling and treatment can avoid flowing into the water body and causing eutrophication and other problems.

[0017] (5) The anaerobic reactor is connected to the inclined plate screen solid-liquid separator through a sludge return pipeline, so that the remaining sludge in the anaerobic reactor is returned to the inclined plate screen solid-liquid separator for further solid-liquid separation and dehydrated through a screw conveyor to form dry sludge, thereby improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model (wherein some structures of the AnMBR device are omitted);

[0019] Figure 2 This is a diagram of the AnMBR device of the utility model;

[0020] Figure 3 It is a process flow chart of the utility model.

[0021] In the figure:

[0022] 1. Screen tank, 2. Transfer tank, 3. Submersible mixer, 41. Water pump, 42. Water inlet pump, 43. Circulation pump, 5. Inclined plate screen solid-liquid separator, 6. Screw conveyor, 7. Drum screen, 8. Anaerobic reactor, 9. Agitator, 10. Biogas tank, 11. Boiler, 12. Tubular membrane assembly, 13. Biogas tank, 14. Closed hot water tank, 15. Liquid level controller, 16. PLC electric control cabinet, 17. Basket filter, 18. Flow meter, 19. Pressure gauge, 20. Water production tank, 21. Ball tank box, 22. Ball entry observation box, 23. Dosing box.

[0023] in, Figure 2 A-wastewater inlet after pretreatment, B-residual sludge discharge, C-product water detection, D-product water follow-up treatment, E-clean water, F-dosing, G-biogas slurry detection. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0030] like Figures 1 to 3 As shown, an aquaculture wastewater treatment device includes a grid pool 1, a transfer pool 2, an inclined plate screen solid-liquid separator 5, a drum screen 7, and an AnMBR device. The AnMBR device includes an anaerobic reactor 8 and a tubular membrane assembly 12 connected by a seventh pipeline, and a valve is installed on the seventh pipeline.

[0031] Among them, pig breeding wastewater flows by gravity from the pipeline to the grate pool 1. The grate pool 1 is equipped with two types of coarse grate and fine grate. The coarse grate can filter debris with a size greater than 6 cm, and the fine grate can filter debris with a size greater than 2 cm. The grate pool 1 adopts a movable cover, which is convenient for opening the grate pool 1 to remove the debris in the grate pool 1.

[0032] The screen pool 1 is connected to the transfer pool 2 through a first pipe, on which a valve is installed. Wastewater passing through the screen pool 1 flows into the transfer pool 2. The top of the transfer pool 2 is covered with a black film to prevent odor from escaping. A submersible agitator 3 is installed in the transfer pool 2 to prevent feces from agglomerating.

[0033] A water pump 41 is installed on the second pipeline connecting the transfer tank 2 and the inclined plate screen solid-liquid separator 5. The inclined plate screen solid-liquid separator 5 is connected to the screw conveyor 6. The wastewater in the transfer tank 2 is sent to the inclined plate screen solid-liquid separator 5 through the water pump 41. In order to prevent the water pump 41 from idling, a vacuum tank and a water supply tank are installed on the second pipeline. The inclined plate screen solid-liquid separator 5 uses the liquid level difference to intercept the particulate matter in the wastewater on the screen surface of the solid-liquid separation screen, and slides down to the screw conveyor 6 under the combined action of gravity and water flushing. Under the extrusion of the screw conveyor 6, it is dehydrated to form dry sludge, which can be used for composting to make organic fertilizer.

[0034] The inclined plate screen solid-liquid separator 5 is connected to the drum screen 7 through a third pipeline, and the drum screen 7 is connected to the screw conveyor 6. The wastewater treated by the inclined plate screen solid-liquid separator 5 flows out through the pores on the screen surface and enters the drum screen 7. The drum screen 7 further removes impurities and particles in the wastewater after solid-liquid separation by centrifugal action, and the filtered residue is continuously sent to the screw conveyor 6 for extrusion to form dry sludge. The wastewater pre-treated by the grid pool 1, the inclined plate screen solid-liquid separator 5, and the drum screen 7 can be temporarily stored in the pretreatment transfer pool for the next step of treatment.

[0035] The drum screen 7 is connected to the anaerobic reactor 8 through a fourth pipeline, and a water inlet pump 42 and a valve are installed on the fourth pipeline. The pre-treated wastewater is transported to the anaerobic reactor 8 through the water inlet pump 42. A water outlet is provided at the upper end of the anaerobic reactor 8, and the water outlet is connected to the biogas tank 13 through a fifth pipeline. The biogas is allowed to flow from the water outlet to the biogas tank 13 by utilizing the height difference; the top of the anaerobic reactor 8 is connected to a biogas tank 10 through a sixth pipeline, and a gas flowmeter and a valve are installed on the sixth pipeline. The biogas tank 10 is connected to the boiler 11, and the anaerobic reactor 8 is connected to the boiler 11. The reactor 8 is equipped with a closed hot water tank 14, which is connected to the boiler 11. The biogas generated from the anaerobic reactor 8 enters the biogas tank 10 and then enters the boiler 11 for combustion. The water vapor generated by the combustion flows into the closed hot water tank 14 outside the anaerobic reactor 8 to maintain the ambient temperature inside the anaerobic reactor 8, thereby saving electricity. The anaerobic reactor 8 is connected to the inclined plate screen solid-liquid separator 5 through a sludge return pipeline. A valve is installed on the sludge return pipeline to return the remaining sludge in the anaerobic reactor 8 to the inclined plate screen solid-liquid separator 5. The solid-liquid separation is continued in the sieve solid-liquid separator 5 and the dry sludge is formed by dehydration through the screw conveyor 6, so as to improve the resource utilization rate. The residual sludge can also be discharged directly. The anaerobic reactor 8 is equipped with a stirrer 9, a temperature sensor, a liquid level controller 15, a pH meter, a redox potentiometer, and a heating rod, and is equipped with a wet gas flow meter and a PLC electric control cabinet 16 on the outside. The anaerobic reactor 8 is electrically controlled by the PLC electric control cabinet 16. Anaerobic digestion requires the redox potential to be controlled within the range of -300 to -550 mV, the pH to be between 6.8 and 7.5, and the temperature to be maintained at a medium temperature environment (37±2°C). When the temperature sensor shows that the temperature is lower than 35°C, the heating rod is started through the control system interlock. When the temperature is higher than 39°C, the heating is automatically stopped. The anaerobic environment is monitored by the redox potentiometer and the pH meter. The temperature sensor, the heating rod and the PLC electric control cabinet 16 are used to realize automatic temperature adjustment, so as to create a good temperature environment for the growth and reproduction of microorganisms and improve the degradation efficiency of pollutants. The biogas tank 13 is equipped with a high liquid level controller and a low liquid level controller.

[0036] The biochemical action of anaerobic microorganisms in the anaerobic reactor 8 is used to remove pollutants in the wastewater. The biochemical process mainly includes three stages: the first is the hydrolysis and acidification stage, in which the hydrolysis and acidification bacteria degrade the macromolecular organic matter in the wastewater into small molecular substances, convert the insoluble organic matter into soluble organic matter, and increase the biodegradability of the wastewater; the second is the hydrogen and acetic acid production stage, under the action of hydrogen and acetic acid production bacteria, the organic matter is decomposed and converted into acetic acid and hydrogen, providing organic matter for subsequent anaerobic digestion and methane production; the third is the methane production stage, in which methanogens are used to convert acetic acid, carbon dioxide, hydrogen, etc. into methane. Although the anaerobic digestion process can be divided into the above stages, in the anaerobic reactor 8, the three stages are carried out simultaneously and maintain a dynamic balance. The main influencing factors are temperature, pH, oxygen content, organic load, etc.

[0037] The biogas tank 13 is connected to the tubular membrane assembly 12 through the water inlet main pipeline. The water inlet main pipeline is equipped with a basket filter 17 (used to filter wastewater to ensure that the wastewater contains fewer fine particulate impurities), a circulation pump 43, a flow meter 18 and a pressure gauge 19. The liquid in the biogas tank 13 is transported to the tubular membrane assembly 12 through the circulation pump 43. The tubular membrane assembly 12 is an external immersion type. The tubular membrane filtration pore size is 0.2μm, the length is 1.22m, the inner diameter of the membrane tube is 12.5mm, and the material is PVDF; the tubular membrane assembly 12 consists of a membrane tube and a membrane shell, and its interior is composed of 18 independent hollow cylindrical membrane tubes connected in series. Concentrated water flows through the hollow part of the membrane tube. Elbows are provided inside the two end covers of the membrane shell so that the membrane tubes are connected in series to form a complete channel. Due to the operation of the circulation pump 43, a certain pressure is generated inside the membrane, and the concentrated water is permeated from the inside of the membrane tube to the water storage outside the membrane tube under the action of pressure; the membrane assembly adopts a water inlet and a concentrated water outlet on one side, and the other side is bolted to facilitate maintenance and replacement of the membrane tube, and the water production outlet is distributed on both sides of the membrane tube. The two water production outlets are respectively connected to the water production tank 20 through the eighth pipeline, and valves are installed on the two eighth pipelines; the tubular membrane assembly 12 intercepts the sludge and particulate impurities in the anaerobic effluent on the membrane surface, and flushes them back to the anaerobic reactor 8 with the water flow. Due to the certain pressure in the membrane, the wastewater permeates from the inner surface of the center of the membrane tube to the water storage on the outer surface of the membrane tube and flows to the water production tank 20, and the water production tank 20 is installed with a high liquid level controller, a low liquid level controller, and a middle liquid level controller.

[0038] Since long-term operation may cause accumulation of pollutants on the membrane core surface and blockage of the membrane pores for pollutants that are difficult to filter, the tubular membrane assembly 12 needs to be cleaned regularly. Therefore, a cleaning device is also included, which includes a spherical tank box 21, a cleaning ball and a ball entry observation box 22. The cleaning ball is made of sponge and has a diameter of 8-10 mm. The spherical tank box 21 is connected to the tubular membrane assembly 12. The ball entry observation box 22 is connected to the spherical tank box 21 through a cleaning pipe and a valve is installed on the cleaning pipe. When cleaning, the cleaning ball is inserted into the water inlet of the tubular membrane assembly 12, and is scrubbed on the membrane surface by the thrust of the water flow. The concentrated water flows out of the tubular membrane assembly and enters the cleaning ball box 22 and is collected. In addition, the cleaning device also includes a dosing box 23. The dosing box 23 is connected to the tubular membrane assembly 12 through a dosing pipe, and a valve is installed on the dosing pipe. The dosing box 23 is connected to the water inlet main pipe through a dosing branch pipe, and a valve is installed on the dosing branch pipe. When cleaning, the agent and clean water are injected into the dosing box 23, and the circulation pump 43 is turned on to perform chemical cleaning.

[0039] Generally, the membrane pollution is judged by observing the increase of transmembrane pressure difference or the decrease of water production flux. In this device, the membrane pollution is mainly determined according to the decrease of water production. After the daily operation is completed, the tubular membrane can produce water to flush the residual particles in the membrane and the pollutants accumulated on the membrane surface. In the membrane cleaning process, the tubular membrane is firstly flushed with the water production tank 20 to ensure that the residual concentrated water in the membrane is replaced. After the residual concentrated water is replaced, it is circulated for a certain period of time to achieve daily simple cleaning and maintenance. If further deep cleaning is required, a cleaning ball can be injected into the tubular membrane assembly 12. The cleaning ball flows with the concentrated water and scrapes off the pollutants accumulated on the inner surface of the tubular membrane. Then, the residual wastewater in the membrane is replaced with clean water. Finally, chemical agents are added to clean the tubular membrane by chemical cleaning to restore the optimal flux.

[0040] In this embodiment, the biogas tank 13, the water production tank 20, and the dosing tank 23 share a water inlet main pipeline. The biogas tank 13 is connected to the water inlet main pipeline through a biogas branch pipe, the water production tank 20 is connected to the water inlet main pipeline through a water production branch pipe, and the dosing tank 23 is connected to the water inlet main pipeline through a dosing branch pipe. The valve control is adopted between the water inlet main pipeline and each branch pipe, which can reduce the installation of the circulation pump 43 and the laying of pipelines; open the valve on the biogas branch pipe, close the valves on the water production branch pipe and the dosing branch pipe, then the biogas enters the tubular membrane module 12 through the circulation pump 43, and the tubular membrane module 12 starts to work; open the valve on the water production branch pipe, close the biogas branch pipe, and the biogas enters the tubular membrane module 12 through the circulation pump 43, and the tubular membrane module 12 starts to work; open the valve on the water production branch pipe, close the biogas branch pipe, and the water production branch pipe is closed. , the valve on the dosing branch pipe can realize water production and cleaning of the tubular membrane assembly. If chemical cleaning is to be achieved, only clean water and chemicals need to be injected into the dosing box 23, the valves on the biogas slurry branch pipe and the water production branch pipe need to be closed, and the circulation pump 43 and the valve on the dosing box branch pipe can be opened. The water inlet main pipeline is also connected to a biogas slurry pipe, and a valve is also installed on the biogas slurry pipe. After the biogas in the biogas slurry tank 13 is fermented, the valves on the branch pipe of the biogas slurry tank 13 and the valves on the biogas slurry pipe are opened, and the valves on other branch pipes are closed. It can be directly used for irrigation of farmland. Deep treatment of the biogas slurry can recover the nitrogen and phosphorus nutrients in the biogas slurry, thereby realizing resource recycling and reuse.

[0041] The operation mode of the anaerobic tubular membrane bioreactor device (AnMBR) is as follows: the pretreated wastewater is transported to the anaerobic reactor 8 by the water inlet pump 42, and the water inlet flow rate is determined by the hydraulic retention time. If the water level in the anaerobic reactor 8 is higher than the liquid level controller 15, the water inlet pump 42 is turned off. When the water level is higher than the high liquid level controller of the biogas tank 13, the circulation pump 43 is turned on. At this time, the valves on the branch pipes of the biogas tank 13, the valves on the two eighth pipelines for water production, and the valves on the seventh pipeline are all opened, and the remaining valves are closed. When the water level in the biogas tank 13 is lower than the low liquid level controller, the circulation pump 43 is turned off and the tubular membrane assembly 12 stops working.

[0042] The cleaning mode of the anaerobic tubular membrane bioreactor (AnMBR) device is as follows: the device mainly judges the membrane fouling and blockage according to the change of water production. When the actual water production is significantly different from the designed water production, the membrane needs to be cleaned. The cleaning of the tubular membrane module 12 is divided into daily cleaning and deep cleaning. Daily cleaning is physical cleaning. The valves on the branch pipe of the water production tank 20, the valve on the seventh pipeline, and the valves on the two eighth pipelines for water production need to be opened, and the remaining valves are closed. After half an hour of water production cleaning, the circulation pump 43 is turned off, and the side box cover of the ball observation box 22 is opened. Then, the valve on the biogas slurry pipe and the valve on the cleaning pipeline are opened to observe whether the cleaning balls flow into the ball observation box 22 with the water flow. After all the cleaning balls flow into the ball observation box 22, the box cover and the valves on the biogas slurry pipe and the valve on the cleaning pipeline are closed, and the circulation pump 43 is turned on. The cleaning balls flow into the tubular membrane with the water flow to scrub the surface of the membrane tube and flow out with the concentrated water to the ball tank box 21 for temporary storage. The ball tank box 21 is provided with a baffle to prevent the cleaning balls from flowing into the anaerobic reactor 8. After continuing the circulation cleaning for half an hour, the daily cleaning of the tubular membrane assembly 12 is completed. The deep cleaning of the tubular membrane assembly 12, i.e., chemical cleaning, is carried out after daily cleaning. During deep cleaning, clean water is first injected into the dosing box 23, and then the valve on the dosing branch pipe and the valve on the seventh pipeline are opened, and the other valves are closed. The circulation pump 43 is turned on until the concentrated water output is clear water-like, and then the circulation pump 43 is turned off, and then chemical agents are injected into the dosing box 23 and stirred. After stirring, the valve on the seventh pipeline is closed and the valve on the dosing pipe is opened, and the drug-washed tubular membrane is opened, while the chemical agents are prevented from flowing into the anaerobic reactor 8 and causing damage to microorganisms. After circulating for half an hour, the valve on the dosing pipe is closed, and the valve on the biogas pipe is opened to allow the chemical agents to flow out, and clean water is injected to clean the dosing box 23, and then other chemical agents are injected and the above operation is repeated. At this point, the deep cleaning process of the tubular membrane assembly 12 is completed.

[0043] The above are preferred implementation modes of the present invention. Technicians in the field to which the present invention belongs can also change and modify the above implementation modes. Therefore, the present invention is not limited to the above specific implementation modes. Any obvious improvements, substitutions or modifications made by technicians in this field on the basis of the present invention belong to the protection scope of the present invention.

Claims

1. A breeding wastewater treatment device, characterized in that: It includes a grid tank, a transfer tank, an inclined plate screen solid-liquid separator, a drum screen, and an AnMBR device. A submersible agitator is installed in the transfer tank. The transfer tank is respectively connected to the grid tank and the inclined plate screen solid-liquid separator. The inclined plate screen solid-liquid separator is respectively connected to the drum screen and the screw conveyor. The drum screen is respectively connected to the AnMBR device and the screw conveyor. The AnMBR device includes an anaerobic reactor and a tubular membrane assembly connected to each other. The anaerobic reactor is connected to the boiler through a biogas tank. The anaerobic reactor is respectively connected to the inclined plate screen solid-liquid separator and the biogas tank.

2. The aquaculture wastewater treatment device according to claim 1, characterized in that: A coarse grid and a fine grid are arranged in the grid pool, and the grid pool is connected to the transfer pool through a first pipeline, and a valve is installed on the first pipeline.

3. The aquaculture wastewater treatment device according to claim 1, characterized in that: The transfer tank is connected to the inclined plate screen solid-liquid separator through a water pump, and the drum screen is connected to the anaerobic reactor through a water inlet pump and a valve.

4. The aquaculture wastewater treatment device according to claim 1, characterized in that: The anaerobic reactor is a fully mixed anaerobic reactor, which is internally equipped with an agitator, a temperature sensor, a liquid level controller, a pH meter, and a heating rod, and externally equipped with a wet gas flow meter and a PLC electric control cabinet; the anaerobic reactor is controlled by the PLC electric control cabinet; the anaerobic reactor is equipped with a closed hot water tank, which is connected to a boiler, and the biogas tank and the water production tank are both equipped with a high liquid level controller and a low liquid level controller, and the water production tank is also equipped with a medium liquid level controller.

5. The aquaculture wastewater treatment device according to claim 1, characterized in that: It also includes a basket filter, which is installed on the water inlet main pipeline of the tubular membrane assembly.

6. The aquaculture wastewater treatment device according to claim 5, characterized in that: It also includes a cleaning device, which includes a spherical tank box, a cleaning ball and a ball entry observation box. The spherical tank box is connected to the tubular membrane assembly. The ball entry observation box is connected to the spherical tank box through a cleaning pipeline, and a valve is installed on the cleaning pipeline.

7. The aquaculture wastewater treatment device according to claim 6, characterized in that: The cleaning device also includes a drug adding box, which is connected to the water inlet main pipeline through a drug adding branch pipe. A valve is installed on the drug adding branch pipe, and a circulation pump, a flow meter, and a pressure gauge are installed on the water inlet main pipeline.

8. The aquaculture wastewater treatment device according to claim 6, characterized in that: The biogas slurry tank and the water production tank are connected to the water inlet main pipeline through a biogas slurry branch pipe and a water production branch pipe respectively, and valves are installed on the biogas slurry branch pipe and the water production branch pipe.

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