A device and method for treating refractory chemical wastewater

Abstract

The application discloses a kind of difficult degradation chemical industrial wastewater treatment device and processing method, it is related to chemical industrial wastewater treatment technical field, and corresponding with raw water pool, including sequentially communicating pretreatment system, A / A / O biological treatment system and MBR membrane treatment system, A / A / O biological treatment system includes sequentially communicating anaerobic tank group and aerobic tank group, further include first heat exchange stirring system and second heat exchange stirring system, first heat exchange stirring system is connected with anaerobic tank group, second heat exchange stirring system is connected with aerobic tank group, first heat exchange stirring system can heat the sewage of anaerobic tank group, and make the sewage of anaerobic tank group circulate flow, second heat exchange stirring system can heat the sewage of aerobic tank group, and make the sewage of aerobic tank group circulate flow.The application can effectively carry out biodegradation to difficult degradation chemical industrial wastewater, improve wastewater treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of chemical wastewater treatment technology, and in particular to a device and method for treating recalcitrant chemical wastewater. Background Technology

[0002] For high-concentration organic wastewater generated during the production of acrylic resins, such as equipment cleaning wastewater, filter cloth cleaning wastewater, laboratory wastewater, floor cleaning wastewater, and RTO flue spray wastewater, treatment is required before discharge to reduce pollution to the surrounding environment.

[0003] In existing technologies, such as Chinese patent document CN218115216U, a chemical wastewater treatment and reuse system is disclosed. Corresponding to the raw water tank, it includes a pretreatment system, an A / A / O biological treatment system, an MBR treatment system, and an electrical control system. The pretreatment system includes a screen tank, a primary sedimentation tank, and an equalization tank connected sequentially to the raw water tank. The A / A / O biological treatment system includes an anaerobic tank group and an aerobic tank group connected sequentially to the equalization tank. The MBR membrane treatment system includes a separation tank and a membrane tank connected sequentially to the aerobic tank group. The membrane tank is connected to a clarification tank, and both the membrane tank and the clarification tank are connected to a sedimentation tank. The sedimentation tank is connected sequentially to a clear water tank, an effluent tank, a deep treatment tank, and a reclaimed water tank. The electrical control system includes several sub-controllers, one for each tank. Although the above-mentioned chemical wastewater treatment and reuse system can treat high-concentration organic wastewater, for some chemical wastewater with high recalcitrant organic matter content, the treatment process suffers from poor anaerobic effect and uneven mixing of influent and bacteria, resulting in low biodegradation efficiency and inability to effectively treat recalcitrant chemical wastewater. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for treating recalcitrant chemical wastewater to solve the problems existing in the prior art, thereby effectively biodegrading recalcitrant chemical wastewater and improving wastewater treatment efficiency.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a wastewater treatment device for recalcitrant chemical wastewater. Corresponding to a raw water tank, it includes a pretreatment system, an A / A / O biological treatment system, and an MBR membrane treatment system connected in sequence. The A / A / O biological treatment system includes an anaerobic tank group and an aerobic tank group connected in sequence. The A / A / O biological treatment system further includes a first heat exchange stirring system and a second heat exchange stirring system. The first heat exchange stirring system is connected to the anaerobic tank group, and the second heat exchange stirring system is connected to the aerobic tank group. The first heat exchange stirring system heats the wastewater in the anaerobic tank group and circulates the wastewater therein, while the second heat exchange stirring system heats the wastewater in the aerobic tank group and circulates the wastewater therein.

[0007] Preferably, the first heat exchange stirring system includes a first self-priming cylinder and a first self-priming pump connected in sequence. The anaerobic tank group is provided with a first circulating water outlet and a first circulating water inlet. The inlet of the first self-priming cylinder is connected to the first circulating water outlet, and the outlet of the first self-priming pump is connected to the first circulating water inlet. A first heat exchanger is provided inside the first self-priming cylinder for heating the wastewater in the anaerobic tank group inside the first self-priming cylinder.

[0008] Preferably, the first heat exchange stirring system further includes a first water inlet distributor, which is disposed in the anaerobic tank group; the first water inlet distributor includes a first main pipe, one end of which is connected to the outlet of the first self-priming pump through the first circulating water inlet, and the other end is closed; multiple first branch pipes are evenly distributed on the first main pipe, and the ends of each first branch pipe are open.

[0009] Preferably, the second heat exchange stirring system includes a second self-priming cylinder and a second self-priming pump connected in sequence. The aerobic tank group is provided with a second circulating water outlet and a second circulating water inlet. The inlet of the second self-priming cylinder is connected to the second circulating water outlet, and the outlet of the second self-priming pump is connected to the second circulating water inlet. A second heat exchanger is provided inside the second self-priming cylinder for heating the wastewater in the aerobic tank group inside the second self-priming cylinder.

[0010] Preferably, the second heat exchange stirring system further includes a second water inlet distributor, which is disposed in the aerobic tank group; the second water inlet distributor includes a second main pipe, one end of which is connected to the outlet of the second self-priming pump through the second circulating water inlet, and the other end is closed; multiple second branch pipes are evenly distributed on the second main pipe, and the ends of each second branch pipe are open.

[0011] Preferably, the pretreatment system includes a grid tank, a primary sedimentation tank, and an equalization tank that are sequentially connected to the raw water tank; an oxidation system is also provided between the equalization tank and the anaerobic tank group, the oxidation system being used to oxidize the recalcitrant organic matter in the wastewater of the equalization tank.

[0012] Preferably, the oxidation system includes a reaction tank and an ozone generator. The inlet of the reaction tank is connected to the outlet of the equalization tank, and the outlet of the reaction tank is connected to the inlet of the anaerobic tank group. The reaction tank can supply ozone, hydrogen peroxide, and ferrous sulfate catalyst. The ozone generator is connected to the reaction tank and is used to introduce ozone into the reaction tank.

[0013] Preferably, the MBR membrane treatment system includes a separation tank and a membrane tank that are sequentially connected to the aerobic tank group. The membrane tank is connected to a clarification tank, and the membrane tank and the clarification tank are jointly connected to a sedimentation tank. The sedimentation tank is sequentially connected to a clear water tank, an effluent tank, a deep treatment tank, and a reclaimed water tank. A desalination system is also provided between the clear water tank and the effluent tank to reduce the salt content of the wastewater in the clear water tank.

[0014] Preferably, the desalination system is an MVR evaporator crystallizer.

[0015] This invention also provides a method for treating recalcitrant chemical wastewater, using the aforementioned recalcitrant chemical wastewater treatment device, comprising the following steps:

[0016] Step 1: The recalcitrant chemical wastewater to be treated in the raw water tank is introduced into the pretreatment system for pretreatment.

[0017] Step 2: The pretreated wastewater enters the A / A / O biological treatment system. First, the wastewater is heated and stirred in the anaerobic tank group by the first heat exchange stirring system to reach the temperature required for the biochemical reaction and to fully mix the mud and water. Through anaerobic biological treatment, the various complex organic matter in the wastewater is decomposed into small molecule organic matter, methane, CO2 gas, ammonia nitrogen, water and inorganic salts.

[0018] Then, the wastewater after anaerobic biological treatment is introduced into the aerobic tank group, where it is heated and stirred by the second heat exchange stirring system to bring the wastewater to the temperature required for the biochemical reaction and to fully mix the mud and water. Through aerobic biological treatment, the organic matter in the wastewater is further decomposed into inorganic matter.

[0019] Step 3: The wastewater treated by the aerobic tank group enters the MBR membrane treatment system for purification.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] The recalcitrant chemical wastewater treatment device provided by this invention, corresponding to the raw water tank, includes a pretreatment system, an A / A / O biological treatment system, and an MBR membrane treatment system connected in sequence. The A / A / O biological treatment system includes an anaerobic tank group, an aerobic tank group, a first heat exchange stirring system, and a second heat exchange stirring system. Because the biochemical reaction efficiency in the anaerobic and aerobic tank groups is low under low temperature conditions, and sludge easily settles and clumps if the water flow is stagnant, the wastewater in the anaerobic tank group is heated by the first heat exchange stirring system and circulated. Similarly, the wastewater in the aerobic tank group is heated by the second heat exchange stirring system and circulated, thereby increasing the water temperature to the temperature required for the biochemical reaction and ensuring thorough mixing of sludge and water, thus promoting the biochemical reaction. The recalcitrant chemical wastewater treatment device provided by this invention achieves effective biodegradation of recalcitrant chemical wastewater, improving wastewater treatment efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the working process of the recalcitrant chemical wastewater treatment device provided in Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the anaerobic tank group provided in Embodiment 1 of the present invention;

[0025] In the diagram: 1-Anaerobic tank group, 101-First circulating water outlet, 102-First circulating water inlet, 2-First self-priming cylinder, 3-First self-priming pump, 4-First main pipe, 5-First branch pipe. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The purpose of this invention is to provide a device and method for treating recalcitrant chemical wastewater to solve the problems existing in the prior art, thereby effectively biodegrading recalcitrant chemical wastewater and improving wastewater treatment efficiency.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a recalcitrant chemical wastewater treatment device, corresponding to the raw water tank, including a pretreatment system, an A / A / O biological treatment system, and an MBR membrane treatment system. The pretreatment system includes a grid tank, a primary sedimentation tank, and an equalization tank that are sequentially connected to the raw water tank. The A / A / O biological treatment system includes an anaerobic tank group 1 and an aerobic tank group that are sequentially connected to the equalization tank. A heat exchanger and an equalization tank lift pump are installed in the equalization tank. The heat exchanger is connected to an external heat source, and the equalization tank lift pump is connected to a pipeline and connected to the anaerobic tank group 1.

[0031] Anaerobic tank group 1 includes multiple anaerobic tanks connected in sequence. The first anaerobic tank is equipped with an automatic pH regulator, a submersible mixer, an anaerobic sludge return pump, and an ABR reactor. The remaining anaerobic tanks are equipped with submersible mixers, anaerobic sludge return pumps, and ABR reactors. All anaerobic sludge return pumps are connected to a sludge thickening tank via pipelines. The aerobic tank is equipped with biological packing material, a variable aperture aerator, and a wastewater lift pump. The variable aperture aerator is connected to the aerator via pipelines, and the wastewater lift pump is connected to a separation tank via pipelines.

[0032] The MBR membrane treatment system includes a separation tank and a membrane tank that are sequentially connected to the aerobic tank group. The membrane tank is connected to the clarification tank, and the membrane tank and the clarification tank are connected to the sedimentation tank. The sedimentation tank is sequentially connected to the clear water tank, the effluent tank, the advanced treatment tank, and the reclaimed water tank.

[0033] In this embodiment, the A / A / O biological treatment system further includes a first heat exchange stirring system and a second heat exchange stirring system. The first heat exchange stirring system is connected to the anaerobic tank group 1, and the second heat exchange stirring system is connected to the aerobic tank group. The first heat exchange stirring system can heat the wastewater in the anaerobic tank group 1 and circulate the wastewater in the anaerobic tank group 1. The second heat exchange stirring system can heat the wastewater in the aerobic tank group and circulate the wastewater in the aerobic tank group, thereby increasing the water temperature and bringing the wastewater to the temperature required for the biochemical reaction. This also ensures thorough mixing of the sludge and water, promoting the biochemical reaction. Through the recalcitrant chemical wastewater treatment device provided in this embodiment, the recalcitrant chemical wastewater is effectively biodegraded, meeting discharge requirements and achieving the purpose of recycling and reuse, thus improving wastewater treatment efficiency.

[0034] In this embodiment, the device also includes an electrical control system, which includes several sub-controllers. Each pool corresponds to one sub-controller, and all sub-controllers are connected to a main controller. Both the sub-controllers and the main controller use PLCs.

[0035] It should be noted that, in addition to the basic system described above, this device also includes an aerator, which is connected to the bottom of the primary sedimentation tank, the bottom of the aerobic tank, and the bottom of the membrane tank via pipelines. The aerator is connected to a sub-controller. This device also includes a sludge thickening tank, which is connected to the primary sedimentation tank, anaerobic tank group 1, and the separation tank via pipelines. The separation tank, membrane tank, clarifier, sedimentation tank, clear water tank, discharge tank, advanced treatment tank, and reclaimed water tank in this device all return sludge to the aerobic tank via pipelines. The separation tank and membrane tank are equipped with MBR membrane modules, MBR suction pumps, membrane module cleaning pumps, membrane module cleaning dosing pumps, and sludge return pumps. The sludge return pumps are connected to the aerobic tank via pipelines.

[0036] It should be noted that the water pumps, aerators, pH automatic regulators, ABR reactors, biological packing materials, reagents, MBR membrane modules, etc. used in this device are all products that can be purchased on the market, so the specific structure and working principle will not be described in detail.

[0037] In this implementation, such as Figure 2 As shown, the first heat exchange stirring system includes a first self-priming cylinder 2 and a first self-priming pump 3 connected in sequence. The anaerobic tank group 1 is provided with a first circulating water outlet 101 and a first circulating water inlet 102. The inlet of the first self-priming cylinder 2 is connected to the first circulating water outlet 101, and the outlet of the first self-priming pump 3 is connected to the first circulating water inlet 102. A first heat exchanger is provided inside the first self-priming cylinder 2 for heating the sewage in the anaerobic tank group 1 inside the first self-priming cylinder 2. Specifically, in this embodiment, the first heat exchanger is a vertical cylindrical type, including multiple steel pipes through which hot water is passed to heat the sewage inside the first self-priming cylinder 2, increase the water temperature, and effectively control the temperature required for bacterial biochemical reactions, keeping the temperature between 30℃ and 37℃, thus promoting biochemical reactions.

[0038] Furthermore, the first heat exchange stirring system also includes a first water inlet distributor, which is installed in the anaerobic tank group 1. The first water inlet distributor includes a first main pipe 4, one end of which is connected to the outlet of the first self-priming pump 3 through the first circulating water inlet 102, and the other end is closed. Multiple first branch pipes 5 are evenly distributed on the first main pipe 4, and the ends of each first branch pipe 5 are open. Specifically, in this embodiment, the anaerobic tank group 1 includes multiple anaerobic tanks connected in sequence. Each anaerobic tank is provided with a first water inlet distributor and a first circulating water inlet 102. The sewage in the anaerobic tank group 1 is discharged from the first circulating water outlet 101 through the first self-priming cylinder 2 and the first self-priming pump 3, and then fed into the first water inlet distributor of the corresponding anaerobic tank through the first circulating water inlet 102. The sewage can flow evenly into the anaerobic tank through the first water inlet distributor, realizing the circulation of sewage, which can fully mix the mud and water, avoid sludge sedimentation and agglomeration, and improve the biochemical effect.

[0039] In this embodiment, the second heat exchange stirring system includes a second self-priming cylinder and a second self-priming pump connected in sequence. The aerobic tank group is provided with a second circulating water outlet and a second circulating water inlet. The inlet of the second self-priming cylinder is connected to the second circulating water outlet, and the outlet of the second self-priming pump is connected to the second circulating water inlet. A second heat exchanger is provided inside the second self-priming cylinder for heating the sewage in the aerobic tank group inside the second self-priming cylinder.

[0040] Furthermore, the second heat exchange stirring system also includes a second water inlet distributor, which is installed in the aerobic tank group; the second water inlet distributor includes a second main pipe, one end of which is connected to the outlet of the second self-priming pump through the second circulating water inlet, and the other end is closed; multiple second branch pipes are evenly distributed on the second main pipe, and the ends of each second branch pipe are open; it should be noted that in this embodiment, the main structures of the first heat exchange stirring system and the second heat exchange stirring system are the same, the only difference being their installation positions.

[0041] In this embodiment, an oxidation system is also provided between the equalization tank and the anaerobic tank group 1. The oxidation system is used to oxidize the recalcitrant organic matter in the wastewater of the equalization tank.

[0042] Furthermore, the oxidation system includes a reaction tank and an ozone generator. The inlet of the reaction tank is connected to the outlet of the equalization tank, and the outlet of the reaction tank is connected to the inlet of the anaerobic tank group 1. The reaction tank can supply ozone, hydrogen peroxide, and ferrous sulfate catalyst. The ozone generator is connected to the reaction tank and is used to introduce ozone into the reaction tank. By utilizing the strong oxidizing properties of ozone and hydrogen peroxide, the recalcitrant organic matter in the wastewater discharged from the equalization tank is pretreated, and the difficult-to-break chemical bonds in the organic matter are broken, providing favorable conditions for subsequent anaerobic treatment.

[0043] In this embodiment, a desalination system is also provided between the clear water tank and the discharge tank. The desalination system is used to reduce the salt content of the sewage in the clear water tank so that the effluent from the discharge tank meets the discharge standards.

[0044] Furthermore, the desalination system is an MVR evaporator crystallizer, which is a mature existing technology that can be selected by those skilled in the art as needed.

[0045] Example 2

[0046] This embodiment provides a method for treating recalcitrant chemical wastewater, using the recalcitrant chemical wastewater treatment device from Embodiment 1, and includes the following steps:

[0047] Step one involves introducing the recalcitrant chemical wastewater from the raw water tank into the pretreatment system for pretreatment. Specifically, the wastewater first passes through a screen tank to remove large particles and debris, then through a primary sedimentation tank to reduce the concentration of suspended solids. Finally, the wastewater enters a regulating tank to adjust the flow rate and homogenize the water quality, reducing the COD of the wastewater. cr Keep it around 10,000.

[0048] Step two involves introducing the wastewater treated in the equalization tank into the A / A / O biological treatment system. First, the wastewater is heated and stirred in the anaerobic tank group 1 by the first heat exchange and stirring system to reach the temperature required for the biochemical reaction (30℃-37℃), ensuring thorough mixing of the sludge and water. Through anaerobic biological treatment, various complex organic substances in the wastewater are decomposed into small molecule organic matter, methane, CO2 gas, ammonia nitrogen, water, and inorganic salts, resulting in an 80% removal of COD from the wastewater. Then, the anaerobic wastewater is introduced into the aerobic tank group, where it is heated and stirred by the second heat exchange and stirring system to reach the temperature required for the biochemical reaction (30℃-37℃), ensuring thorough mixing of the sludge and water. Through aerobic biological treatment, the organic matter in the wastewater is further decomposed into inorganic matter.

[0049] Step three involves introducing the wastewater treated in the aerobic tank group into the MBR membrane treatment system for purification. Specifically, firstly, the wastewater undergoes membrane separation in the separation tank and membrane tank, reducing the suspended solids content and turbidity of the wastewater to near zero and removing most of the bacteria and viruses. Then, the wastewater sequentially enters the clarification tank, sedimentation tank, clear water tank, discharge tank, advanced treatment tank, and reclaimed water tank for further treatment. Wastewater treated in the discharge tank meets discharge standards, while wastewater treated in the reclaimed water tank can be reused.

[0050] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A wastewater treatment device for recalcitrant chemical wastewater, corresponding to a raw water tank, comprising a pretreatment system, an A / A / O biological treatment system, and an MBR membrane treatment system connected in sequence, wherein the A / A / O biological treatment system comprises an anaerobic tank group and an aerobic tank group connected in sequence; characterized in that: The A / A / O biological treatment system further includes a first heat exchange stirring system and a second heat exchange stirring system. The first heat exchange stirring system is connected to the anaerobic tank group, and the second heat exchange stirring system is connected to the aerobic tank group. The first heat exchange stirring system can heat the wastewater in the anaerobic tank group and circulate the wastewater. The second heat exchange stirring system can heat the wastewater in the aerobic tank group and circulate the wastewater. The first heat exchange stirring system includes a first self-priming cylinder and a first self-priming pump connected in sequence. The anaerobic tank group is provided with a first circulating water outlet and a first circulating water inlet. The inlet of the first self-priming cylinder is connected to the first circulating water outlet, and the outlet of the first self-priming pump is connected to the first circulating water inlet. A first heat exchanger is provided inside the first self-priming cylinder for heating the wastewater in the anaerobic tank group within the first self-priming cylinder. The anaerobic tank group includes five anaerobic tanks connected in sequence. The inlet of the first self-priming cylinder is connected to the fourth anaerobic tank. The pretreatment system includes a grid tank, a primary sedimentation tank, and an equalization tank connected in sequence to the raw water tank. An oxidation system is also provided between the equalization tank and the anaerobic tank group. The oxidation system is used to oxidize recalcitrant organic matter in the wastewater of the equalization tank. The second heat exchange stirring system includes a second self-priming cylinder and a second self-priming pump connected in sequence. The aerobic tank group is provided with a second circulating water outlet and a second circulating water inlet. The inlet of the second self-priming cylinder is connected to the second circulating water outlet, and the outlet of the second self-priming pump is connected to the second circulating water inlet. A second heat exchanger is provided inside the second self-priming cylinder for heating the wastewater in the aerobic tank group within the second self-priming cylinder. The oxidation system includes a reaction tank and an ozone generator. The inlet of the reaction tank is connected to the outlet of the equalization tank, and the outlet of the reaction tank is connected to the inlet of the anaerobic tank group. The reaction tank can supply ozone, hydrogen peroxide, and ferrous sulfate catalyst. The ozone generator is connected to the reaction tank for introducing ozone into the reaction tank.

2. The recalcitrant chemical wastewater treatment device according to claim 1, characterized in that: The first heat exchange stirring system further includes a first water inlet distributor, which is disposed in the anaerobic tank group; the first water inlet distributor includes a first main pipe, one end of which is connected to the outlet of the first self-priming pump through the first circulating water inlet, and the other end is closed; multiple first branch pipes are evenly distributed on the first main pipe, and the ends of each first branch pipe are open.

3. The recalcitrant chemical wastewater treatment device according to claim 1, characterized in that: The second heat exchange stirring system also includes a second water inlet distributor, which is installed in the aerobic tank group. The second water inlet distributor includes a second main pipe, one end of which is connected to the outlet of the second self-priming pump through the second circulating water inlet, and the other end is closed. Multiple second branch pipes are evenly distributed on the second main pipe, and the ends of each second branch pipe are open.

4. The recalcitrant chemical wastewater treatment device according to claim 1, characterized in that: The MBR membrane treatment system includes a separation tank and a membrane tank that are sequentially connected to the aerobic tank group. The membrane tank is connected to a clarification tank, and the membrane tank and the clarification tank are connected to a sedimentation tank. The sedimentation tank is sequentially connected to a clear water tank, an effluent tank, a deep treatment tank, and a reclaimed water tank. A desalination system is also provided between the clear water tank and the effluent tank. The desalination system is used to reduce the salt content of the wastewater in the clear water tank.

5. The recalcitrant chemical wastewater treatment device according to claim 4, characterized in that: The desalination system is an MVR evaporator crystallizer.

6. A method for treating recalcitrant chemical wastewater, employing the recalcitrant chemical wastewater treatment device as described in any one of claims 1-5, characterized in that: Includes the following steps: Step 1: The recalcitrant chemical wastewater to be treated in the raw water tank is introduced into the pretreatment system for pretreatment. Step two involves introducing the pretreated wastewater into the A / A / O biological treatment system. First, the wastewater is heated and stirred in the anaerobic tank group by the first heat exchange and stirring system to reach the temperature required for the biochemical reaction, ensuring thorough mixing of the sludge and water. Through anaerobic biological treatment, various complex organic substances in the wastewater are decomposed into small-molecule organic matter, methane, CO2 gas, ammonia nitrogen, water, and inorganic salts. Then, the anaerobic wastewater is introduced into the aerobic tank group, where it is heated and stirred by the second heat exchange and stirring system to reach the temperature required for the biochemical reaction, ensuring thorough mixing of the sludge and water. Through aerobic biological treatment, the organic matter in the wastewater is further decomposed into inorganic matter. Step 3: The wastewater treated by the aerobic tank group enters the MBR membrane treatment system for purification.

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