A series-connected multi-stage MABR intelligent water treatment system

Abstract

This invention relates to the field of wastewater treatment technology, and more particularly to a series-connected multi-stage MABR intelligent water treatment system. It includes a multi-stage membrane aeration biofilm reactor unit and a data monitoring and feedback unit. The multi-stage membrane aeration biofilm reactor unit comprises a MABR membrane module, magnetic rods, pipelines, valves, air clamps, a water storage tank, a bidirectional transfer pump, a membrane aeration aerobic biofilm reactor unit, a membrane aeration micro-aerobic biofilm reactor unit, and a membrane aeration anaerobic biofilm reactor unit. The series-connected multi-stage MABR intelligent water treatment system provided by this invention, through the multi-stage membrane aeration biofilm reactor unit and the data monitoring and feedback unit, can achieve efficient removal of various complex pollutants such as persistent organic pollutants (POPs), such as pesticides and nitrogen elements in water bodies, through real-time monitoring and feedback, thereby contributing to energy conservation and carbon reduction.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a series-connected multi-stage MABR intelligent water treatment system. Background Technology

[0002] MABR membrane technology principle: MABR is a wastewater treatment technology that combines biofilm with aeration membrane materials. The core of its reactor is the membrane module and the biofilm. The biofilm attaches and grows on the outer side of the membrane material. Oxygen is transferred from the inside of the membrane to the outside, supplying oxygen to the biofilm, and the oxygen pressure is maintained below the bubble point pressure of the membrane module; therefore, this oxygen supply method is also called bubble-free aeration. Oxygen continuously enters the biofilm from within the membrane module under the drive of the pressure difference. Simultaneously, the biofilm comes into full contact with pollutants in the water, and the pollutants enter the interior of the biofilm due to concentration differences and the absorption effect of the biofilm.

[0003] Persistent organic pollutants (POPs) are a class of environmental pollutants that have attracted widespread attention due to their high toxicity, high bioaccumulation, long persistence in the environment, and ability to migrate long distances globally, posing a potential threat to the global environment. Biodegradation is an important migration and transformation pathway for POPs after they enter the environment, and research on the biodegradability of POPs is of great significance for evaluating their environmental fate, ecological risks, and selecting suitable remediation technologies. However, existing water treatment systems have room for improvement in terms of low energy consumption, low material consumption, low cost, high efficiency, POPs removal from water, and resource recycling without secondary pollution.

[0004] To address the technical bottlenecks of traditional MABR technology, (1) single-stage reactors are difficult to adapt to the gradient degradation requirements of complex pollutant systems, especially for bioinhibitory POPs pollutants; (2) aeration energy consumption accounts for 60-70% of the total system energy consumption, and the oxygen utilization rate of traditional foam aeration is less than 40%; (3) the regulation of biofilm functional microbial communities lacks a dynamic response mechanism, making it difficult to maintain the stable progress of fine reactions such as short-cut nitrification-anaerobic ammonia oxidation. Therefore, a series-connected multi-stage MABR intelligent water treatment system is designed to provide an alternative technical solution to the above-mentioned technical problems. Summary of the Invention

[0005] Therefore, it is necessary to provide a series-connected multi-stage MABR intelligent water treatment system to address the aforementioned technical problems, thereby solving the technical issues that existing water treatment systems have room for improvement in terms of low energy consumption, low material consumption, low cost, high efficiency, POPs removal from water, and resource recycling without secondary pollution.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A series-connected multi-stage MABR reaction intelligent water treatment system includes a multi-stage membrane aeration biofilm reaction unit and a data monitoring and feedback unit;

[0008] The multi-stage membrane aeration biofilm reactor unit includes a MABR membrane module, a magnet rod, pipelines, valves, air clamps, a water storage tank, a two-way transfer pump, a membrane aeration aerobic biofilm reactor unit, a membrane aeration micro-aerobic biofilm reactor unit, and a membrane aeration anaerobic biofilm reactor unit.

[0009] As a preferred embodiment of the series-connected multi-stage MABR reaction intelligent water treatment system provided by the present invention, the data monitoring and feedback unit includes a peristaltic pump, pipelines, treated water storage tank, temperature sensor, DO sensor, pH sensor and data display.

[0010] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, the membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit are spatially separated from each other and connected in series.

[0011] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, the order in which the treated water flows into the membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, the membrane aeration anaerobic biofilm reactor unit, and the water storage tank can be arbitrarily combined.

[0012] The aeration sequence remains unchanged, proceeding from the membrane aeration aerobic biofilm reactor unit to the membrane aeration microaerobic biofilm reactor unit and then to the membrane aeration anaerobic biofilm reactor unit.

[0013] As a preferred embodiment of the series multi-stage MABR reaction intelligent water treatment system provided by the present invention, the membrane aeration anaerobic biofilm reactor unit serves as the first-stage reaction unit, and the output water flow is the first treated water flow.

[0014] The membrane aeration micro-aerobic biofilm reactor unit serves as a second-stage reaction unit, and its output water flow is the second treated water flow.

[0015] The membrane aeration aerobic biofilm reactor unit serves as the third-stage reaction unit, and its output water flow is the third-stage treated water flow.

[0016] The POPs content of the water flow treated by the membrane aeration aerobic biofilm reactor unit is lower than that of the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit inputs the first treated water flow into the membrane aeration micro-aerobic biofilm reactor unit.

[0017] The POPs content of the water flow treated by the membrane aeration micro-aerobic biofilm reactor unit is lower than that of the membrane aeration aerobic biofilm reactor unit, and the membrane aeration micro-aerobic biofilm reactor unit inputs a second treated water flow into the membrane aeration aerobic biofilm reactor unit.

[0018] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, the membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit all include hollow fiber membranes.

[0019] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, the membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit include magnetic rods.

[0020] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, the membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit include magnetic nano-iron.

[0021] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, both the membrane aeration anaerobic biofilm reactor unit and the membrane aeration micro-aerobic biofilm reactor unit contain polymer gel packing material.

[0022] As a preferred embodiment of the multi-stage MABR intelligent water treatment system provided by the present invention, the membrane aeration aerobic biofilm reactor unit, the micro-oxygen biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit all include an outlet valve.

[0023] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0024] Meanwhile, through the above technical solutions, the present invention has at least the following beneficial effects:

[0025] 1. The present invention provides a series-connected multi-stage MABR reaction intelligent water treatment system, which, through multi-stage membrane aeration biofilm reaction units and data monitoring and feedback units, can achieve efficient removal of various complex pollutants such as persistent organic pollutants (POPs) through real-time monitoring and feedback, such as pesticides and nitrogen elements in water, thereby contributing to energy conservation and carbon reduction.

[0026] 2. The multi-stage MABR reaction intelligent water treatment system of the present invention has a three-stage gradient oxygen environment coupling system. By constructing an anaerobic-microaerobic-aerobic reaction unit series system, combined with magnetic control functional materials and intelligent feedback mechanism, it realizes the stepwise directional degradation of POPs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the water treatment system of the present invention.

[0029] In the diagram: 1. Feed tank; 2. Feed peristaltic pump; 3. Feed valve; 4. Water inlet; 5. Aerator; 6. Air inlet rotor flow meter; 7. Air inlet pressure gauge; 8. Air inlet; 9. Hollow fiber membrane module; 10. Ferromagnetic rod and magnetic nano-iron module; 11. Polymer gel packing; 12. Cover; 13. Valve; 14. Bidirectional transfer pump; 15. Air outlet; 16. Air pipe clamp; 17. Water outlet; 18. Stop valve; 19. Temperature sensor; 20. DO sensor; 21. pH sensor; 22. Data display; 23. Return pump; 24. Membrane aerated anaerobic biofilm reactor unit; 25. Membrane aerated micro-aerobic biofilm reactor unit; 26. Membrane aerated aerobic biofilm reactor unit; 27. Water storage tank; 28. Return pump; 29. ​​Sample tank; 30. Medicine bottle. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] Reference Figure 1 A series of multi-stage MABR reaction intelligent water treatment system, specifically taking the removal of nitrogen and organophosphorus pesticide pollutants in water as an example.

[0035] The multi-stage MABR reaction intelligent water treatment system has a three-stage gradient oxygen environment coupling system. By constructing a series system of "anaerobic-microaerobic-aerobic" reaction units, combined with magnetically controlled functional materials and intelligent feedback mechanisms, it achieves the stepwise and directional degradation of POPs.

[0036] Figure 1 In the diagram, the dark color (black) represents the air passage, and the light color (blue) represents the water passage.

[0037] It includes a multi-stage membrane aeration biofilm reaction unit and a data monitoring and feedback unit;

[0038] Preferably, the multi-stage membrane aeration biofilm reaction unit has a "vertical hierarchical + transverse coupling" reactor configuration, and a cross-unit material circulation channel is established through a bidirectional transfer pump 14.

[0039] The multi-stage membrane aeration biofilm reactor unit includes a MABR membrane module, a magnet rod, pipelines, valves 13, air pipe clamps 16, a water storage tank 27, a two-way transfer pump 14, a membrane aeration aerobic biofilm reactor unit 26, a membrane aeration micro-aerobic biofilm reactor unit 25, and a membrane aeration anaerobic biofilm reactor unit 24.

[0040] In this embodiment, an outlet 17 is provided at the top of the membrane aeration anaerobic biofilm reactor unit 24 near the end of the membrane aeration micro-aerobic biofilm reactor unit 25. The outlet 17 intelligently intercepts pollutants through multi-spectral sensing. A stop valve 18 is provided at the bottom of the membrane aeration anaerobic biofilm reactor unit 24 away from the end of the membrane aeration micro-aerobic biofilm reactor unit 25. The stop valve 18 adopts pressure difference-turbidity dual-mode interlocking to achieve shock protection.

[0041] In this embodiment, the inner side of the membrane aeration micro-oxygen biofilm reactor unit 25 is provided with a polymer gel packing 11, and the top of the membrane aeration micro-oxygen biofilm reactor unit 25 is provided with a cover 12.

[0042] The data monitoring and feedback unit includes a feed peristaltic pump 2, pipelines, a treated water storage tank, a temperature sensor 19, a DO sensor 20, a pH sensor 21, and a data display 22, which can automatically collect the temperature, DO, and pH in the treated water and provide feedback control for collection or reflux operations.

[0043] In this embodiment, the temperature sensor 19, DO sensor 20, and pH sensor 21 are all located inside the sample container 29, allowing the sample container 29 to carry a micro mass spectrometry module to complete the in-situ high-sensitivity detection of POPs degradation products. The input end of the sample container 29 is connected to a reflux pump 28.

[0044] In this embodiment, the output end of the sample tank 29 is connected to a reflux pump 23, which allows the reflux pump 23 to dynamically optimize the reflux ratio based on AI to improve the denitrification efficiency. The output end of the reflux pump 23 is in contact with the medicine bottle 30.

[0045] In this embodiment, a feed valve 3 is provided between the feed peristaltic pump 2 and the membrane aeration anaerobic biofilm reactor unit 24, and an inlet 4 is provided at the top of the membrane aeration anaerobic biofilm reactor unit 24. The inlet 4 optimizes the water ratio through magnetization pretreatment and dynamic diversion.

[0046] The membrane aerated aerobic biofilm reactor unit 26, membrane aerated microaerobic biofilm reactor unit 25, and membrane aerated anaerobic biofilm reactor unit 24 are spatially separated and connected in series, which can be adjusted as needed. The water flow received by the membrane aerated anaerobic biofilm reactor unit from the inlet pipe can be any water flow suitable for treatment by the membrane aerated anaerobic biofilm reactor unit, where the microbial content needs to be reduced, such as agricultural wastewater or urban domestic sewage. The order in which the treated water flows into the membrane aerated aerobic biofilm reactor unit 26, membrane aerated microaerobic biofilm reactor unit 25, membrane aerated anaerobic biofilm reactor unit 24, and water storage tank 27 can be arbitrarily combined. The aeration sequence remains constant, from membrane aerated aerobic biofilm reactor unit 26 to membrane aerated microaerobic biofilm reactor unit 25 and then to membrane aerated anaerobic biofilm reactor unit 24.

[0047] In this embodiment of the invention, the first treated water stream output from the membrane aeration anaerobic biofilm reactor unit 24 helps provide a stable environment for the membrane aeration micro-aerobic biofilm reactor unit 25. The lower organic matter concentration in the first treated water stream output from the membrane aeration aerobic biofilm reactor unit 26 helps reduce competition from heterotrophic bacteria for anaerobic ammonia-oxidizing bacteria. The lower dissolved oxygen concentration in the first treated water stream output from the membrane aeration anaerobic biofilm reactor unit 24 makes it easier to achieve an anoxic environment in the liquid phase. Simultaneously, controlling the temperature of the membrane aeration micro-aerobic biofilm reactor unit 25 at 30-35℃ and pH=8 promotes faster proliferation of nitrite-oxidizing bacteria while inhibiting the proliferation of nitrate-oxidizing bacteria, thus inhibiting NO2 production. - -N to NO3 - The oxidation process of -N leads to the accumulation of large amounts of NO2. - -N. This contributes to the anaerobic ammonia oxidation reaction in the membrane aeration micro-oxygen membrane bioreactor unit.

[0048] In this embodiment of the invention, the membrane aeration aerobic biofilm reactor unit 26, the membrane aeration micro-aerobic biofilm reactor unit 25, and the membrane aeration anaerobic biofilm reactor unit 24 all adopt bubble-free aeration. Compared with the technology of using foam aeration, it can have a higher oxygen transfer rate and oxygen transfer efficiency, which can help to greatly reduce the energy consumption and material consumption of the water treatment system.

[0049] The biofilm in membrane aeration micro-aerobic biofilm reactor unit 25 is a heterogeneous mass transfer system. Oxygen is transferred from the aeration membrane of membrane aeration micro-aerobic biofilm reactor unit 25 to the liquid phase of the second input water flow (i.e., the first treated water flow), and can be directly utilized by the biofilm attached to the aeration membrane. Short-range nitrification can occur on the aerobic biofilm near the surface of the aeration membrane. That is, ammonia nitrogen in the first treated water flow is oxidized to nitrite nitrogen by oxygen under the action of nitrite bacteria on the biofilm, thereby accumulating a large amount of NO2. - -N.

[0050] The pH of the membrane aeration micro-aerobic biofilm reactor unit 25 is maintained stable. A pH sensor monitors the pH in real-time online. Then, a peristaltic pump 2 with wireless signal reception is used to deliver pH-adjusting chemicals into the membrane aeration micro-aerobic biofilm reactor unit 25, thereby controlling the pH of the second treated water stream to approximately pH 8, which is conducive to the reproduction of nitrite-oxidizing bacteria. This, in turn, controls the ratio of ammonia nitrogen to nitrite nitrogen in the first treated water stream, for example, to a level favorable for anaerobic ammonia oxidation. Optionally, the ratio of ammonia nitrogen to nitrite nitrogen in the first treated water stream is favorable for micro-aerobic ammonia oxidation. The second treated water stream is circulated back into the membrane aeration anaerobic biofilm reactor unit 24 through the storage tank 27, thereby achieving pH stability in the membrane aeration aerobic biofilm reactor unit 26.

[0051] In this embodiment of the invention, the membrane aeration biofilm reactor unit may include any suitable membrane aeration biofilm reactor body and corresponding supporting materials, devices, equipment, and systems such as air supply system, water inlet system, and circulation system.

[0052] The membrane aeration biofilm reactor unit includes hollow fiber membrane modules 9, specifically, hollow fiber membranes are included in the membrane aeration aerobic biofilm reactor unit 26, the micro-oxygen biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit 24. Multiple hollow fiber membranes can be used to form one or more membrane modules. The hollow fiber membranes are spirally wound onto a magnetic rod, which saves space while increasing the surface area for microbial attachment, thereby improving the removal efficiency of complex pollutants such as POPs.

[0053] In membrane aeration anaerobic biofilm reactor unit 24, raw sewage flows in and phosphorus-containing sludge returned from storage tank 27 enters simultaneously. The main function of membrane aeration anaerobic biofilm reactor unit 24 is to release phosphorus, thereby increasing the concentration of P in the sewage. Dissolved organic matter is absorbed by microbial cells, thereby decreasing the concentration of BOD in the sewage. In addition, some NH3-N is removed due to cell synthesis, thereby decreasing the concentration of NH3-N in the sewage, but the NO3-N content remains unchanged.

[0054] The biofilm in the membrane-aerated micro-aerobic biofilm reactor unit 25 can be a heterogeneous mass transfer system. Oxygen is transferred from the aeration membrane in the membrane-aerated micro-aerobic biofilm reactor unit 25 towards the liquid phase and is directly utilized by the biofilm attached to the aeration membrane. This helps to achieve stratification from the micro-aerobic zone on the membrane surface to the anoxic zone in the liquid phase, providing a suitable environment for different reaction stages. Short-range nitrification can occur on the micro-aerobic biofilm near the membrane surface. That is, ammonia nitrogen in the first treated water stream is oxidized to nitrite nitrogen by oxygen under the action of ammonia-oxidizing bacteria on the biofilm, resulting in the second treated water stream. An example of the short-range nitrification reaction formula includes: the main body of the liquid phase of the second treated water stream includes anoxic zones with high substrate concentration and low dissolved oxygen concentration, which is conducive to the occurrence of micro-aerobic ammonia oxidation reaction. For example, under the action of micro-aerobic ammonia-oxidizing bacteria on the biofilm in the main body of the liquid phase, nitrite nitrogen in the main body of the liquid phase can act as an electron acceptor, and ammonia nitrogen can act as an electron donor, undergoing micro-aerobic ammonia oxidation reaction to produce nitrogen gas for denitrification while producing a small amount of nitrate nitrogen. Examples of reaction formulas for micro-oxygen ammonia oxidation include:

[0055] The membrane aeration anaerobic biofilm reactor unit 24 and the membrane aeration micro-aerobic biofilm reactor unit 25 include a polymeric gel packing material 11. The polymeric gel packing material 11 has strong hydrophilicity and high affinity for anaerobic ammonia oxidizing bacteria, making it easy for anaerobic ammonia oxidizing biofilms to adhere. This helps to provide a stable anoxic environment and sufficient space for the anaerobic ammonia oxidizing reaction, while the phosphorus content changes very little.

[0056] In membrane aerated aerobic biofilm reactor unit 26, organic matter is biochemically degraded by microorganisms, leading to a continued decrease in concentration. Organic nitrogen is ammonified and then nitrified, resulting in a significant decrease in NH3-N concentration. However, the nitrification process increases the NO3-N concentration, and phosphorus (P) decreases rapidly due to excessive uptake by polyphosphate-accumulating bacteria. Therefore, this process can simultaneously achieve organic matter removal, nitrification, and phosphorus removal through excessive uptake. Membrane aerated anaerobic biofilm reactor unit 24 and membrane aerated aerobic biofilm reactor unit 26 work together to complete the phosphorus removal function. Phosphorus-accumulating microorganisms in the activated sludge of membrane aerated aerobic biofilm reactor unit 26 can absorb large amounts of soluble phosphorus, converting it into insoluble polyphosphates for storage. Finally, the excess sludge is discharged through storage tank 27 to achieve the system's phosphorus removal purpose.

[0057] The membrane aeration anaerobic biofilm reactor unit 24, the membrane aeration micro-aerobic biofilm reactor unit 25, and the membrane aeration aerobic biofilm reactor unit 26 may include corresponding supporting materials, devices, equipment, systems, etc. as needed.

[0058] The membrane aeration anaerobic biofilm reactor unit 24, the membrane aeration aerobic biofilm reactor unit 26, and the membrane aeration microaerobic biofilm reactor unit 25 all include magnetic rods and magnetic iron nanoparticles 10. Magnetic iron nanoparticles have a high affinity for pesticides in water, easily adsorbing pesticide components such as glyphosate and terbutaline (herbicides), and exhibit selective adsorption without affecting microorganisms. This achieves pesticide adsorption without occupying space. Magnetic iron nanoparticles can have surface deposits removed by heating, and the magnetic rods adsorb, fix, and recycle the magnetic iron nanoparticles for reuse.

[0059] As can be seen from the above, short-cut nitrification consumes ammonia nitrogen, while anaerobic ammonia oxidation consumes both ammonia nitrogen and nitrite nitrogen. The multi-stage MABR intelligent water treatment system can significantly reduce the total nitrogen concentration in the untreated water stream. Polyphosphate-accumulating bacteria take up phosphorus (P). Optionally, the total nitrogen concentration in the third-stage treated water stream is lower than that in the untreated water stream. The organic phosphorus concentration in the third-stage treated water stream is lower than that in the untreated water stream.

[0060] As can be seen from the above, both short-cut nitrification and micro-ammonia oxidation consume ammonia nitrogen. Polyphosphate-accumulating bacteria absorb large amounts of dissolved phosphorus, and the multi-stage MABR intelligent water treatment system can significantly reduce the concentrations of ammonia nitrogen and organic phosphorus in the treated water stream.

[0061] Preferably, the membrane aeration anaerobic membrane bioreactor unit may include any suitable membrane aeration aerobic membrane bioreactor and corresponding supporting materials, devices, equipment, systems, etc.

[0062] Preferably, the membrane aeration anaerobic membrane bioreactor unit may include any suitable membrane aeration micro-oxygen membrane bioreactor and corresponding supporting materials, devices, equipment, systems, etc.

[0063] Preferably, the membrane aeration micro-oxygen membrane bioreactor unit may include any suitable membrane aeration micro-oxygen membrane bioreactor and corresponding supporting materials, devices, equipment, systems, etc.

[0064] Preferably, the membrane aeration aerobic membrane bioreactor unit may include any suitable membrane aeration anaerobic membrane bioreactor and corresponding supporting materials, devices, equipment, systems, etc.

[0065] In this embodiment, the membrane aeration aerobic biofilm reactor unit 26, the micro-oxygen biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit 24 all include an outlet valve.

[0066] In this embodiment, the POPs concentration and other pollutant concentration of the water flow treated by the membrane aeration anaerobic biofilm reactor unit 24 are lower than those of the water flow flowing out of the feed tank 1; the POPs concentration and other pollutant concentration of the water flow treated by the membrane aeration micro-aerobic biofilm reactor unit 25 are lower than those of the first treated water flow flowing out of the membrane aeration aerobic biofilm reactor unit 26; and the POPs concentration and other pollutant concentration of the water flow treated by the membrane aeration aerobic biofilm reactor unit 26 are lower than those of the second treated water flow flowing out of the membrane aeration micro-aerobic biofilm reactor unit 25.

[0067] In this embodiment, the membrane aeration anaerobic biofilm reactor unit 24, as the first-stage reaction unit, is located in an anaerobic environment conducive to the reduction reaction of anaerobic microorganisms, and its output water flow is the first treated water flow; the membrane aeration micro-aerobic biofilm reactor unit 25, as the second-stage reaction unit, is located in a micro-aerobic environment conducive to the reduction-oxidation reaction, and its output water flow is the second treated water flow, thus allowing the membrane aeration anaerobic biofilm reactor unit 24 to input treated water into the membrane aeration micro-aerobic biofilm reactor unit 25; the membrane aeration aerobic biofilm reactor unit 26, as the third-stage reaction unit, is located in an aerobic environment conducive to the oxidation reaction of aerobic microorganisms, and its output water flow is the third treated water flow, thus allowing the membrane aeration micro-aerobic biofilm reactor unit 25 to input treated water into the membrane aeration aerobic biofilm reactor unit 26.

[0068] In this embodiment, the membrane aeration aerobic biofilm reactor unit 26, the membrane aeration micro-aerobic biofilm reactor unit 25, and the membrane aeration anaerobic biofilm reactor unit 24 are integrated into one unit.

[0069] It also includes an aerator 5, which uses gas pulse coupled fuzzy PID control to achieve efficient bubble-free oxygen supply. One end of the aerator 5 is connected to an air inlet rotor flow meter 6, and the other end of the air inlet rotor flow meter 6 is connected to an air inlet pressure gauge 7. The air inlet pressure gauge 7 is connected to the membrane aerated aerobic biofilm reactor unit 26 through the air inlet 8. The membrane aerated anaerobic biofilm reactor unit 24 is connected to the membrane aerated anaerobic biofilm reactor unit 26 through the air outlet 15. Thus, the air intake assembly composed of the aerator 5, the air inlet rotor flow meter 6, the air inlet pressure gauge 7, the air inlet 8 and the air outlet 15 can ensure the stability of oxygen mass transfer through interlocking control, forming a low-consumption and high-efficiency POPs deep removal system.

[0070] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A series-connected multi-stage MABR intelligent water treatment system, characterized in that, It includes a multi-stage membrane aeration biofilm reaction unit and a data monitoring and feedback unit; The multi-stage membrane aeration biofilm reactor unit includes a MABR membrane module, a magnet rod, pipelines, valves, air clamps, a water storage tank, a two-way transfer pump, a membrane aeration aerobic biofilm reactor unit, a membrane aeration micro-aerobic biofilm reactor unit, and a membrane aeration anaerobic biofilm reactor unit. The sequence of the treated water flowing into the membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, the membrane aeration anaerobic biofilm reactor unit, and the water storage tank can be arbitrarily combined. The aeration sequence remains unchanged, from membrane aeration aerobic biofilm reactor unit to membrane aeration microaerobic biofilm reactor unit and then to membrane aeration anaerobic biofilm reactor unit. The membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit all include magnetic rods. The membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit all include magnetic iron nanoparticles.

2. The intelligent water treatment system for a series multi-stage MABR reactor according to claim 1, characterized in that, The data monitoring and feedback unit includes a peristaltic pump, pipelines, a treated water storage tank, a temperature sensor, a DO sensor, a pH sensor, and a data display.

3. The intelligent water treatment system for a series multi-stage MABR reactor according to claim 1, characterized in that, The membrane aeration aerobic biofilm reactor unit, the membrane aeration microaerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit are spatially separated from each other but connected in series.

4. The intelligent water treatment system for a series multi-stage MABR reactor according to claim 1, characterized in that, The membrane aeration aerobic biofilm reactor unit, the membrane aeration micro-aerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit all include hollow fiber membranes.

5. The intelligent water treatment system for a series multi-stage MABR reactor according to claim 1, characterized in that, Both the membrane aeration anaerobic biofilm reactor unit and the membrane aeration micro-aerobic biofilm reactor unit contain polymer gel packing material.

6. The intelligent water treatment system for a series multi-stage MABR reactor according to claim 1, characterized in that, The membrane aeration aerobic biofilm reactor unit, the membrane aeration microaerobic biofilm reactor unit, and the membrane aeration anaerobic biofilm reactor unit all include an outlet valve.

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