Pure membrane MBBR (Moving Bed Biofilm Reactor) sewage treatment system

Abstract

The pure membrane MBBR sewage treatment system comprises an anoxic denitrification zone, an anaerobic ammonia oxidation zone, an aerobic oxidation zone, a high-density sedimentation zone, an MBBR biological filtration zone, a backwashing water tank and an equipment room, the anoxic denitrification region is used for carrying out amination reaction, organic matter hydrolysis reaction and denitrification reaction on the sewage and nitrate and nitrite in the anoxic denitrification region; the anaerobic ammonia oxidation zone is used for reacting the sewage with nitrite to generate nitrogen; the aerobic oxidation zone is used for promoting microorganisms to degrade organic matters in sewage and convert ammonia nitrogen; the high-density settling zone is used for separating muddy water in sewage; the MBBR biological filtration area is used for filtering suspended matters in the sewage; the backwashing water tank is used for providing backwashing make-up water for the MBBR biological filtration area; and the equipment room is used for placing disinfection equipment, a fan and a power distribution control system.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, and more particularly to a pure membrane MBBR wastewater treatment system. Background Technology

[0002] With industrial development and population growth, wastewater discharge is increasing daily. Wastewater contains large amounts of pollutants such as organic matter, nitrogen, and phosphorus, posing a serious threat to the environment. Traditional wastewater treatment processes often have many limitations. For example, they focus only on removing single pollutants, making it difficult to comprehensively remove wastewater containing multiple pollutants, resulting in treated water that fails to meet discharge standards.

[0003] Biological treatment processes suffer from difficulties in controlling the growth environment of microorganisms, which affects their growth and ultimately their ability to decompose and transform pollutants. This results in the system being unable to operate continuously and stably, making it difficult to meet increasingly stringent environmental protection requirements and the actual needs of wastewater treatment at different scales. Utility Model Content

[0004] This application provides a pure membrane MBBR wastewater treatment system, including: anoxic denitrification zone, anaerobic ammonia oxidation zone, aerobic oxidation zone, high-density sedimentation zone, MBBR biological filtration zone, backwash tank, and equipment room;

[0005] The anaerobic ammonia oxidation zone is located on one side of the anoxic denitrification zone, the aerobic oxidation zone is located at one end of the anoxic denitrification zone and the anaerobic ammonia oxidation zone, the high-density sedimentation zone is located on one side of the aerobic oxidation zone, the MBBR biological filtration zone is located on the other side of the anoxic denitrification zone, the backwash water tank is located on one side of the MBBR biological filtration zone, and the equipment room is located on one side of the high-density sedimentation zone.

[0006] The anoxic denitrification zone is used to carry out amination, organic matter hydrolysis and denitrification reactions between wastewater and nitrates and nitrites in the anoxic denitrification zone;

[0007] The anaerobic ammonia oxidation zone is used to react wastewater with nitrite to generate nitrogen gas;

[0008] The aerobic oxidation zone is used to promote the degradation of organic matter and the conversion of ammonia nitrogen in wastewater by microorganisms;

[0009] The high-density sedimentation zone is used to separate mud and water from wastewater;

[0010] The MBBR biological filtration zone is used to filter suspended solids in wastewater;

[0011] The backwash water tank is used to provide backwash water to the MBBR biological filtration zone;

[0012] The equipment room is used to house disinfection equipment, fans, and power distribution control systems.

[0013] Optionally, the anoxic denitrification zone is equipped with a first mixing and stirring system and a first fixed biological bed;

[0014] The anaerobic ammonia oxidation zone is equipped with a second mixing and stirring system and a second fixed biological bed.

[0015] The first mixing system and the second mixing system are disposed on both sides of the fixed biological bed;

[0016] The first fixed biological bed and the second fixed biological bed are located between the anoxic denitrification zone and the anaerobic ammonia oxidation zone.

[0017] Optionally, the aerobic oxidation zone is equipped with a removable belt aerator, MBBR packing, and MBBR packing screen; the MBBR packing is located at the bottom of the aerobic oxidation zone; the removable belt aerator is located at the top of the MBBR packing; and the MBBR packing screen is located between the aerobic oxidation zone and the high-density sedimentation zone.

[0018] Optionally, the aerobic oxidation zone is equipped with a nitrification reflux facility, and the nitrification liquid reflux facility is located between the aerobic oxidation zone and the anoxic denitrification zone.

[0019] Optionally, the proportion of MBBR packing added in the aerobic oxidation zone is 55% to 75%.

[0020] Optionally, the high-density sedimentation zone is provided with a coagulation zone, a flocculation zone, and a separation zone; the coagulation zone is used to add coagulant to the wastewater so that the coagulant reacts with the wastewater to obtain small flocs; the flocculation zone is used to accelerate the stirring of the small flocs to obtain large floc particles; the separation zone is used to accelerate the settling of the large floc particles to obtain sludge and supernatant.

[0021] Optionally, the separation zone is equipped with a sludge return facility, through which the sludge is returned to the coagulation zone.

[0022] Optionally, the MBBR biological filtration zone is equipped with MBBR filter media, MBBR filter media screen, aeration and mixing equipment, inlet pipe, and backwash tank control valve; the MBBR filter media is used to provide an attachment bed for microorganisms to reproduce; the MBBR filter media screen is used to intercept the MBBR filter media; the aeration and mixing equipment is used to agitate and increase the dissolved oxygen content in the water of the MBBR biological filtration zone; the backwash tank control valve is used to control the water in the backwash tank; and the inlet pipe is used to transport the water in the backwash tank to the MBBR biological filtration zone.

[0023] As can be seen from the above technical solutions, this application has the following advantages:

[0024] 1. By setting up anoxic denitrification zone, anaerobic ammonia oxidation zone, aerobic oxidation zone, high-density sedimentation zone, MBBR biological filtration zone, backwash tank, and equipment room, the various zones work together to treat organic matter, nitrogen, and phosphorus in wastewater in a targeted manner, which effectively improves the efficiency of wastewater treatment.

[0025] 2. By setting up a high-density sedimentation zone, the effect of mud-water separation is improved, and incomplete mud-water separation is avoided.

[0026] 3. By setting up the MBBR biological filtration zone, suspended solids in the wastewater are effectively filtered out, thus improving the wastewater discharge standards. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the upper plan layout of the pure membrane MBBR wastewater treatment system;

[0028] Figure 2 This is a schematic diagram of the lower plan layout of the pure membrane MBBR wastewater treatment system;

[0029] Figure 3 This is a schematic diagram of the first cross-section of the pure membrane MBBR wastewater treatment system;

[0030] Figure 4 This is a second cross-sectional schematic diagram of the pure membrane MBBR wastewater treatment system. Detailed Implementation

[0031] To address the aforementioned technical problems, this application provides a pure membrane MBBR wastewater treatment system for use in wastewater treatment systems.

[0032] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0033] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0036] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Please see Figures 1 to 4 This application provides a pure membrane MBBR wastewater treatment system, including: anoxic denitrification zone 1, anaerobic ammonia oxidation zone 2, aerobic oxidation zone 3, high-density sedimentation zone 4, MBBR biological filtration zone 5, backwash tank 6, and equipment room 7.

[0038] Anaerobic ammonia oxidation zone 2 is located on one side of anoxic denitrification zone 1, aerobic oxidation zone 3 is located at one end of anoxic denitrification zone 1 and anaerobic ammonia oxidation zone 2, high-density sedimentation zone 4 is located on one side of aerobic oxidation zone 3, MBBR biological filtration zone 5 is located on the other side of anoxic denitrification zone 1, backwash water tank 6 is located on one side of MBBR biological filtration zone 5, and equipment room 7 is located on one side of high-density sedimentation zone 4.

[0039] The anoxic denitrification zone 1 is used to carry out amination, organic matter hydrolysis and denitrification reactions between wastewater and nitrates and nitrites in the anoxic denitrification zone 1;

[0040] The anoxic denitrification zone 1 is equipped with a first mixing and stirring system 101 and a first fixed biological bed 102. The denitrifying bacteria in the anoxic denitrification zone 1 attach to the biological bed and form a thick biofilm. Through the stirring of the first mixing and stirring system 101, the sewage and denitrification return liquid are transported to the biofilm to complete the hydrolysis, amination reaction and anoxic denitrification of organic matter.

[0041] Organic matter hydrolysis is the process by which complex organic matter in wastewater is broken down into smaller organic molecules by denitrifying bacteria and other microorganisms. These smaller organic molecules provide a carbon source for the growth and other reactions of denitrifying bacteria and other microorganisms.

[0042] Amination is the process by which nitrogen-containing organic matter in wastewater decomposes to produce amine compounds. For example, certain nitrogen-containing organic matter, such as proteins, decomposes under the catalysis of microbial enzymes to produce amino groups, providing intermediate products for subsequent denitrification reactions.

[0043] Denitrifying bacteria use small organic molecules produced by hydrolysis as electron donors to reduce nitrates and nitrites to nitrogen gas.

[0044] Anaerobic ammonia oxidation zone 2 is used to react wastewater with nitrite to generate nitrogen gas;

[0045] Under anaerobic conditions, denitrifying bacteria further react, using nitrate as an electron acceptor to oxidize ammonia nitrogen in wastewater into nitrogen gas. The nitrification reaction saves a large amount of oxygen supply, eliminating the need for additional organic carbon sources for denitrification and greatly reducing the operating costs and energy consumption of wastewater treatment.

[0046] Aerobic oxidation zone 3 is used to promote the degradation of organic matter and the conversion of ammonia nitrogen in wastewater by microorganisms;

[0047] Microorganisms use oxygen as an electron acceptor to oxidize and decompose organic matter through complex enzymatic reactions. For example, with simple glucose, microorganisms break it down into carbon dioxide and water through reactions such as glycolysis, releasing energy for their own growth and reproduction.

[0048] Under aerobic conditions, ammonia-oxidizing bacteria convert ammonia nitrogen into nitrite, while denitrifying bacteria use organic matter as an electron donor to reduce nitrite into nitrogen gas, which is then released into the atmosphere. Nitrifying bacteria then further oxidize the nitrite into nitrate.

[0049] High-density sedimentation zone 4 is used to separate mud and water from wastewater;

[0050] Wastewater enters the high-density sedimentation zone 4, where large sludge particles settle to the bottom under gravity, forming a sludge layer. Lighter water flows through the sludge layer, forming a clear water layer. The clear water layer is equipped with an outlet, through which the clear water is discharged. The sludge layer is equipped with pipes, through which the sludge is transported to a sludge treatment device for further treatment.

[0051] MBBR biological filtration zone 5 is used to filter suspended solids in wastewater;

[0052] Wastewater enters the MBBR biological filtration zone, where it mixes thoroughly with the suspended biofilm. The MBBR biological filtration zone 5 is equipped with an aeration and mixing system 503. Under the action of mixing, the wastewater continuously flows within the filtration zone, and suspended solids are removed through multiple interceptions and adsorptions by the biofilm, as well as decomposition by microorganisms.

[0053] Backwash tank 6 is used to provide backwash makeup water for MBBR biological filtration zone 5;

[0054] In the MBBR biological filtration zone, a large amount of suspended solids, colloids, and microbial metabolic products are adsorbed onto the surface of the biofilm carrier. The accumulation of these substances can lead to biofilm clogging, reducing filtration efficiency and affecting the normal metabolism of microorganisms within the biofilm. Backwashing is performed to remove clogging and restore the biofilm's filtration performance. Backwash tank 6 supplies backwash water to MBBR biological filtration zone 5 via pipelines.

[0055] Equipment room 7 is used to house disinfection equipment, fans, and power distribution control systems.

[0056] In the final stage of wastewater treatment, disinfection effectively kills various pathogens remaining in the wastewater, such as bacteria, viruses, and parasites. In the aerobic oxidation zone 3, microorganisms require sufficient oxygen to degrade organic matter in the wastewater and convert ammonia nitrogen. A blower delivers air to the aeration system, ensuring oxygen is fully dissolved in the wastewater, providing a suitable living environment for aerobic microorganisms and improving wastewater treatment efficiency. The power distribution control system precisely controls the power supply to each piece of equipment, preventing electrical faults such as overload and short circuits. The power distribution control system also monitors the operating status of the equipment, such as temperature and operating time, providing data support for equipment maintenance and upkeep.

[0057] The disinfection equipment, fans, and power distribution control system are centrally located in equipment room 7, which facilitates centralized management and operation by operators.

[0058] In this embodiment, by setting up anoxic denitrification zone 1, anaerobic ammonia oxidation zone 2, aerobic oxidation zone 3, high-density sedimentation zone 4, MBBR biological filtration zone 5, backwash tank 6, and equipment room 7, these zones work together to target organic matter, nitrogen, and phosphorus in the wastewater, effectively improving wastewater treatment efficiency. The high-density sedimentation zone 4 enhances sludge-water separation and prevents sludge-water separation at the bottom. The MBBR biological filtration zone 5 effectively filters out suspended solids in the wastewater, improving wastewater discharge standards.

[0059] In an optional embodiment, the anoxic denitrification zone 1 is provided with a first mixing and stirring system 101 and a first fixed biological bed 102; the anaerobic ammonia oxidation zone is provided with a second mixing and stirring system 201 and a second fixed biological bed 202; the first mixing and stirring system 101 and the second mixing and stirring system 201 are located on both sides of the first fixed biological bed 102 and the second fixed biological bed 202. The first fixed biological bed 102 and the second fixed biological bed 202 are located between the anoxic denitrification zone 1 and the anaerobic ammonia oxidation zone 2;

[0060] In this embodiment, the denitrifying bacteria in the anoxic denitrification zone 1 need to use nitrates in the wastewater as electron acceptors. The first mixing and stirring system 101 and the second mixing and stirring system 201 are set up to ensure that nitrates, organic matter and other substances in the anoxic denitrification zone 1 and the anaerobic ammonia oxidation zone 2 are fully mixed in the water, so that the denitrifying bacteria can fully contact the required substrate, promote the denitrification reaction and improve the nitrogen removal efficiency.

[0061] The first fixed biological bed 102 and the second fixed biological bed 202 provide a favorable environment for microorganisms to attach and grow, allowing them to adhere to the surface of the biological beds and form biofilms. In the anoxic denitrification zone 1, after denitrifying bacteria form biofilms on the biological beds, they can carry out denitrification reactions more stably; in the anaerobic ammonia oxidation zone 2, anaerobic ammonia oxidizing bacteria can attach to the fixed biological beds, promoting their growth.

[0062] In an optional embodiment, the aerobic oxidation zone 3 is provided with a removable belt aerator 301, MBBR packing 302, and MBBR packing screen 303; the MBBR packing 302 is located at the bottom of the aerobic oxidation zone 3; the removable belt aerator 301 is located at the top of the MBBR packing; and the MBBR packing screen 303 is located between the aerobic oxidation zone 3 and the high-density sedimentation zone 4.

[0063] In this embodiment, the extractable belt aerator 301 is used to introduce air into the aerobic oxidation zone 3, providing oxygen for the metabolism of aerobic microorganisms. The MBBR packing material 302 is added in the aerobic oxidation zone 3 at a ratio of 55% to 75%. The MBBR packing material 302 provides attachment points for microorganisms, which grow and reproduce in the MBBR packing material 302 to form a biofilm. The microorganisms fully decompose organic matter in the aerobic zone, improving the wastewater treatment efficiency of the aerobic oxidation zone 3. The MBBR packing material screen 303 is used to intercept the MBBR packing material 302, preventing it from flowing out of the MBBR biological filtration zone 5 with the water flow.

[0064] In an optional embodiment, the aerobic oxidation zone 3 is provided with a nitrification liquid reflux facility 304, which is located between the aerobic oxidation zone 3 and the anoxic denitrification zone 1.

[0065] In this embodiment, the aerobic oxidation zone 3 is equipped with a nitrification liquid return facility 304. The nitrification liquid in the aerobic oxidation zone 3 is returned to the anoxic oxidation zone 1 through the nitrification liquid return facility 304. The returned nitrification liquid contains a large amount of nitrate and nitrite, which provides nitrate and nitrite for the nitrification reaction, promotes the wastewater treatment efficiency of the anoxic ammonia oxidation zone, and saves nitrification liquid.

[0066] In an optional embodiment, the high-density sedimentation zone 4 is provided with a coagulation zone 401, a flocculation zone 402, and a separation zone 403; the coagulation zone 401 is used to add coagulant to the wastewater so that the coagulant reacts with the wastewater to obtain small flocs; the flocculation zone 402 is used to accelerate the stirring of small flocs to obtain large floc particles; the separation zone 403 is used to accelerate the settling of large floc particles to obtain sludge and supernatant.

[0067] In practical applications, coagulation zone 401 involves adding coagulants to wastewater. Coagulants are positively charged chemical substances, while the fine suspended solids in wastewater are negatively charged. After the coagulant is added, it reacts with the fine suspended solids in the wastewater to form small flocs. Flocculation zone 402 is equipped with a stirring device. The stirring device accelerates the collision of small flocs, resulting in larger floc particles. These large floc particles then settle and separate in separation zone 403.

[0068] In this embodiment, the separation zone 403 is equipped with inclined plates 40303, a sludge return system 40301, a connecting pipe 40302, and an effluent overflow weir 40304. Wastewater flows in the channels between the inclined plates 40303, and soil particles settle on the surface of the inclined plates 40303. The inclined plates 40303 increase the sedimentation area, shortening the settling distance of the soil particles and improving the efficiency of soil settling. The sludge return system 40301 returns a portion of the settled sludge to the coagulation zone 401 and flocculation zone 402 for further treatment. The connecting pipe 40302 is used for water flow connection and distribution, ensuring uniform water flow. The effluent overflow weir 40304 is located at the top of the separation zone 403 and is used to control the effluent level of the separation zone 403 and ensure the stability and quality of the effluent.

[0069] Optionally, the MBBR biological filtration zone 5 is equipped with MBBR filter media 501, MBBR filter media screen 502, aeration and mixing device 503, inlet pipe 504, and backwash tank control valve 505; MBBR filter media 501 is used to provide an attachment bed for microorganisms to reproduce; MBBR filter media screen 502 is used to intercept MBBR filter media 501; aeration and mixing device 503 is used to mix and increase the dissolved oxygen in the water of MBBR biological filtration zone 5; backwash tank control valve 505 is used to control the water in the backwash tank; and inlet pipe 504 is used to transport water from the backwash tank to MBBR biological filtration zone 5.

[0070] In this embodiment, the MBBR filter media provides an attachment bed for microorganisms to treat wastewater. The MBBR filter media screen is used to intercept the MBBR filter media 501 and prevent the media from being lost. The aeration and mixing device 503 provides oxygen for the microorganisms. The backwashing operation is carried out by controlling the backwash tank control valve 505 and the inlet pipe 504. The backwashing operation is to remove blockages and restore the filtration performance of the biofilm and carrier so that the MBBR biological filtration zone can filter wastewater for a long time.

[0071] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pure membrane MBBR wastewater treatment system, characterized in that, The system comprises an anoxic denitrification zone, an anaerobic ammonia oxidation zone, an aerobic oxidation zone, a high-density sedimentation zone, an MBBR biological filtration zone, a backwashing water tank and a device room. The anaerobic ammonia oxidation zone is arranged on one side of the anoxic denitrification zone, the aerobic oxidation zone is arranged at one end of the anoxic denitrification zone and the anaerobic ammonia oxidation zone, the high-density sedimentation zone is arranged on one side of the aerobic oxidation zone, the MBBR biological filtration zone is arranged on the other side of the anoxic denitrification zone, the backwashing water tank is arranged on one side of the MBBR biological filtration zone, and the device room is arranged on one side of the high-density sedimentation zone. The anoxic denitrification zone is used for carrying out amination reaction, organic matter hydrolysis reaction and denitrification reaction of sewage and nitrate and nitrite in the anoxic denitrification zone. The anaerobic ammonia oxidation zone is used for reacting sewage and nitrite to generate nitrogen. The aerobic oxidation zone is used for promoting the degradation of organic matter and the conversion of ammonia nitrogen in sewage by microorganisms. The high-density sedimentation zone is used for separating sludge and water in sewage. The MBBR biological filtration zone is used for filtering suspended matter in sewage. The backwashing water tank is used for providing backwashing make-up water for the MBBR biological filtration zone. The device room is used for placing disinfection equipment, a fan and a power distribution control system. The anoxic denitrification zone is provided with a first mixing and stirring system and a first fixed biological bed.

2. The clear film MBBR wastewater treatment system according to claim 1, characterized in that, The anaerobic ammonia oxidation zone is provided with a second mixing and stirring system and a second fixed biological bed. The first mixing and stirring system and the second mixing and stirring system are arranged on both sides of the fixed biological bed. The first fixed biological bed and the second fixed biological bed are arranged between the anoxic denitrification zone and the anaerobic ammonia oxidation zone.

3. The pure membrane MBBR sewage treatment system according to claim 1, wherein The aerobic oxidation zone is provided with a drawable belt aerator, MBBR fillers and MBBR filler nets. The MBBR fillers are arranged at the bottom of the aerobic oxidation zone. The drawable belt aerator is arranged at the upper end of the MBBR fillers. The MBBR filler nets are arranged between the aerobic oxidation zone and the high-density sedimentation zone. The aerobic oxidation zone is provided with a nitrification liquid reflux facility arranged between the aerobic oxidation zone and the anoxic denitrification zone.

4. The clear film MBBR wastewater treatment system according to claim 3, characterized in that, The proportion of the MBBR fillers in the aerobic oxidation zone is 55% to 75%.

5. The clear film MBBR wastewater treatment system according to claim 3, characterized in that, 6. The pure membrane MBBR sewage treatment system according to claim 1, wherein The high-density sedimentation zone is provided with a coagulation zone, a flocculation zone and a separation zone. The coagulation zone is used for adding a coagulant into sewage, so that the coagulant reacts with the sewage to obtain small flocs. The flocculation zone is used for accelerating stirring of the small flocs to obtain large floc particles. The separation zone is used for accelerating sedimentation of the large floc particles to obtain sludge and supernatant. The separation zone is provided with a sludge reflux facility, and the sludge is refluxed into the coagulation zone through the sludge reflux facility.

7. The clear film MBBR wastewater treatment system according to claim 6, characterized in that, The MBBR biological filtration zone is provided with MBBR filter materials, MBBR filter nets, aeration and stirring facilities, a water inlet pipe and a backwashing pool control valve.

8. The clear film MBBR wastewater treatment system according to claim 1, wherein, ​ The MBBR filter material is used to provide an attached bed for microorganisms to breed; The MBBR filter material blocking net is used to block the MBBR filter material; The aeration and stirring facility is used to stir and increase the dissolved oxygen in the water in the MBBR biological filtration zone; The backwashing tank control valve is used to control the water in the backwashing tank; The water inlet pipe is used to transport the water in the backwashing tank to the MBBR biological filtration zone.

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