A MABR integrated device and method for treating aerospace wastewater

Abstract

An integrated MABR device and method for treating aerospace wastewater belongs to the technical field of wastewater treatment devices. When the pressure exceeds the system's design safety value, the PLC issues a corresponding warning. After the water inlet is finished, the circulating centrifugal pump starts after a delay, mixing the wastewater to be treated with the residual water in the circulating tank. The wastewater continuously passes over the biofilm surface, reducing the pollutant concentration. When the gas source is pure oxygen or air, the corresponding gas path opens, adopting a single-end oxygen supply mode, and the gas supply pressure is maintained within a predetermined range. When the gas supply pressure is lower than the set value, the PLC system controls the gas source switch to supplement the pure oxygen supply. The PLC control system monitors the pressure, flow rate, and water quality of gases / liquids in various parts of the system in real time. The monitoring equipment data is transmitted to the PLC control device, which comprehensively analyzes the data feedback and adjusts the switching of the controlled equipment.

Description

Technical Field

[0001] This invention relates to an integrated MABR device and method for treating aerospace wastewater, belonging to the technical field of wastewater treatment devices. Background Technology

[0002] Environmental control and life support technologies essentially involve the recycling of consumable materials in manned spacecraft. Water is a crucial consumable resource, and in wastewater regeneration systems, wastewater sources include carbon dioxide reduction, condensate from cooling and dehumidification, domestic wastewater, and astronaut urine. Microbial wastewater treatment methods offer advantages such as environmental friendliness, low energy consumption, minimal external material consumption, and relatively high water recovery rates, and are considered the future direction for wastewater treatment in regenerative life support systems. Membrane bioreactors (MBRs), as one of the fastest-growing biological methods in water treatment, feature small footprint, high solid-liquid separation efficiency, resistance to shock loads, and ease of automation control, making them suitable for ECLSS environments with limited space and high automation requirements. However, traditional MBR bubbling aeration methods suffer from low oxygen utilization, severe membrane fouling, large sludge discharge, large footprint, and bulky integrated devices, limiting their use in spacecraft.

[0003] In microgravity environments, surface tension plays a dominant role. Fluids in microgravity lack hydrostatic pressure, gravity-driven convection, and sedimentation, making directional flow and separation difficult. The traditional aeration-based operation mode in biofilm processes is not feasible in microgravity. However, the membrane aerated biofilm reactor (MABR) is a novel and highly efficient wastewater treatment technology that organically combines membrane aeration and biological treatment technologies. Its basic principle is as follows: a microbial membrane adheres to the surface of a permeable membrane, directly obtaining oxygen from it. As wastewater flows around the permeable membrane, pollutants in the water enter the biofilm under the influence of concentration gradient and microbial adsorption. Through biological metabolism and proliferation, they are utilized by microorganisms, assimilating pollutants into microbial cells that are fixed on the biofilm or decomposing them into inorganic metabolites, thereby purifying the water.

[0004] Currently, the treatment processes for various types of wastewater, including domestic water, on the International Space Station mainly employ physicochemical methods. These include steam compression distillation technology used on the US Space Station and membrane evaporation technology used on the Mir space station. Other physicochemical methods include freeze-drying / freeze-concentration-reverse osmosis, involving process units such as ion exchange, resin adsorption, and wet catalytic oxidation. While physicochemical technologies offer high treatment efficiency and stable results, they are extremely energy and material-intensive. This invention patents a MABR integrated device for treating aerospace wastewater, with biochemical treatment as its core, offering significant advantages such as low economic cost, strong resistance to environmental interference, and reusability. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an integrated MABR (Massively Integrated Bioreactor) device and method for treating aerospace wastewater. The integrated aerospace wastewater treatment system, using a bubble-free aerated membrane bioreactor (MABR) as its core, has significant applicability. This integrated system can meet the needs of scientific management and real-time monitoring of the MABR's operating status, and provide timely feedback on the wastewater treatment progress.

[0006] An integrated MABR (Mass Aeration Bioreactor) device for treating aerospace wastewater includes a PLC control unit. An air source is connected to one end of a manual pressure-reducing valve on one air intake device. The other end of the manual pressure-reducing valve is connected to a gas safety valve, which in turn is connected to an air intake valve. The other end of the air intake valve is connected to the MABR reactor body. A pure oxygen source is connected to one end of a manual pressure-reducing valve on another air intake device. The other end of this valve is connected to a gas safety valve, which in turn is connected to an air intake valve. The other end of the air intake valve is connected to the MABR reactor body. The MABR reactor body is connected to multiple water quality analyzers, a liquid pressure gauge, a gas pressure gauge, an inlet check valve, a sampling / venting valve, and a circulating water tank. The system connects the inlet to one end of the centrifugal pump, the other end of the centrifugal pump to the inlet check valve, the other end of the gas pressure gauge to the gas flow meter, the other end of the gas flow meter to the exhaust valve, the other end of the exhaust valve to the dryer, the other end of the dryer to the oxygen / carbon dioxide sensor, the other end of the oxygen / carbon dioxide sensor to the gas outlet, the outlet of the circulating water tank to the liquid pressure relief valve, the other end of the liquid pressure relief valve to the circulating centrifugal pump, the other end of the circulating centrifugal pump to the other end of the multi-water quality analyzer, the other end of the circulating water tank to the pressure solenoid valve, and the other end of the pressure solenoid valve and one end of the pressure regulating valve to the outlet. The PLC control device is connected to the above components respectively.

[0007] The outlet pipeline valve, Y-type filter, outlet check valve and pressure regulating valve are connected in sequence to form an outlet liquid-solid separation filtration device. The two liquid-solid separation filtration devices are respectively connected to the circulating water tank and the outlet.

[0008] A MABR integrated treatment method for aerospace wastewater includes the following steps:

[0009] Step 1: The MABR integrated system uses a PLC system to control the switching of each component. The aerospace mixed wastewater to be treated is pressurized by a pump after entering the inlet and mixed in the MABR tank. Under the pressure at the outlet, the treated wastewater is discharged outside the device through a liquid-solid separation filter. The PLC simultaneously monitors the system pressure during liquid-solid separation and issues a corresponding warning when the pressure exceeds the system's design safety value.

[0010] Step 2: After the water intake is completed, the circulating centrifugal pump starts after a delay. The wastewater to be treated mixes with the residual water in the circulating water tank. The sewage continuously passes over the surface of the biofilm, reducing the concentration of pollutants.

[0011] Step 3: When the gas source is air, the corresponding air intake path is opened, the air circulates, and the gas supply pressure is maintained within the set range; when the oxygen content is lower than the predetermined value, the gas in the pipeline stops circulating, and the PLC system controls the switch to replenish fresh air for oxygen supply.

[0012] Step 4: When the gas source is pure oxygen, the corresponding gas circuit is opened, and a single-end oxygen supply mode is adopted, maintaining the gas supply pressure within a predetermined range. When the gas supply pressure is lower than the set value, the PLC system controls the gas source switch to supplement the pure oxygen supply.

[0013] Step 5: The PLC control system monitors the pressure, flow rate, and water quality of the gas / liquid in each part of the system in real time. The monitoring equipment data is transmitted to the PLC control device. The PLC device analyzes the data feedback and adjusts the switching of the controlled equipment.

[0014] The advantage of this invention is the development of a wastewater purification technology and integrated device suitable for confined environments in the aerospace field. The integrated device organically combines microbial biochemical treatment and a bubble-free aeration biofilm reactor (MABR) to meet the treatment requirements of aerospace wastewater: treating air condensate, urine, sanitary wastewater, or mixtures thereof in confined environments; with no consumption of other external substances except for oxygen or air supply.

[0015] The core of the integrated device for treating aerospace wastewater is the non-foaming aerated bioreactor (MABR). The system integrates the inlet and outlet water systems, liquid-solid separation system, hydraulic circulation system, pure oxygen / air supply system, and MABR water tank. The integrated MABR reactor is used to treat aerospace wastewater, including urine wastewater, condensate wastewater, sanitary wastewater, and other mixed wastewater. The dual-pipeline design for pure oxygen / air supply improves the system's applicability, the circulating water tank reduces the volumetric load of the wastewater treatment system, and the pressure solenoid valve ensures system safety.

[0016] The oxygen source has wide applicability, and the oxygen supply circuit is equipped with different operating modes for both air and pure oxygen sources; the MABR integrated unit, which can treat aerospace wastewater, is applicable to the field of aerospace wastewater treatment; the system is specially equipped with a liquid-solid separation filtration device, and the integrated unit can achieve single liquid phase for both influent and effluent, reducing the burden on downstream wastewater treatment; the system is equipped with multiple pressure and water quality monitoring components to ensure the safe and effective operation of the system.

[0017] This invention is designed to treat approximately 5 L / d, with an adjustable hydraulic retention time (HRT = 12–48 h). The influent TOC is 600–2500 mg / L, and the influent total nitrogen is 560–2600 mg / L. It achieves a TOC removal rate of ≥90% and a TN nitrification rate (converted to NO3). - The proportion of -N is ≥70%, and the TN removal rate is ≥50%.

[0018] This invention meets the needs for scientific management and real-time monitoring of MABR operation status, and provides timely feedback on wastewater treatment. It features a small footprint, high solid-liquid separation efficiency, resistance to shock loads, and ease of automation control, making it suitable for environmental control and life support systems (ECLSS) with limited space and high automation requirements. Attached Figure Description

[0019] When considered in conjunction with the accompanying drawings, the invention will be more fully and better understood, and its many accompanying advantages will become readily apparent, by referring to the following detailed description. However, the accompanying drawings, which are provided to further illustrate the invention and form part of this invention, are used to explain the invention and do not constitute an undue limitation thereof, as shown in the figures:

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a control diagram of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Obviously, many modifications and variations made by those skilled in the art based on the spirit of this invention fall within the scope of protection of this invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Those skilled in the art will understand that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

[0027] To facilitate understanding of the embodiments, further explanations and descriptions will be provided below, and the various embodiments do not constitute a limitation on the embodiments.

[0028] Example 1: Figure 1 , Figure 2 As shown, an integrated MABR device for treating aerospace wastewater includes a PLC control unit. An air source 1 is connected to one end of a manual pressure reducing valve 2 of one air intake device. The other end of the manual pressure reducing valve 2 is connected to a gas safety valve 3. The other end of the gas safety valve 3 is connected to an air intake valve 4. The other end of the air intake valve 4 is connected to the MABR reactor body 27. A pure oxygen source 11 is connected to one end of a manual pressure reducing valve 2 of another air intake device. The other end of the manual pressure reducing valve 2 is connected to a gas safety valve 3. The other end of the gas safety valve 3 is connected to the air intake valve 4. The other end of the air intake valve 4 is connected to the MABR reactor body 27. The MABR reactor body 27 is connected to a multi-water quality analyzer 19, a liquid pressure gauge 26, a gas pressure gauge 5, an inlet check valve 14, a sampling / venting valve 15, and a circulating water tank 1. One end of 6 is connected to the inlet 12 and one end of the inlet centrifugal pump 13. The other end of the inlet centrifugal pump 13 is connected to the inlet check valve 14. The other end of the gas pressure gauge 5 is connected to the gas flow meter 6. The other end of the gas flow meter 6 is connected to the exhaust gas valve 7. The other end of the exhaust gas valve 7 is connected to the dryer 8. The other end of the dryer 8 is connected to the oxygen / carbon dioxide sensor 9. The other end of the oxygen / carbon dioxide sensor 9 is connected to the gas outlet 10. The outlet of the circulating water tank 16 is connected to the liquid pressure relief valve 21. The other end of the liquid pressure relief valve 21 is connected to the circulating centrifugal pump 20. The other end of the circulating centrifugal pump 20 is connected to the other end of the multi-water quality analyzer 19. The other end of the circulating water tank 16 is connected to the pressure solenoid valve 17. The other end of the pressure solenoid valve 17 and one end of the pressure regulating valve 25 are connected to the outlet 18.

[0029] The outlet pipeline valve 22, Y-type filter 23, outlet check valve 24 and pressure regulating valve 25 are connected in sequence to form an outlet liquid-solid separation filtration device. The two liquid-solid separation filtration devices are respectively connected to the circulating water tank 16 and the outlet 18.

[0030] The PLC control unit is connected to the following components: air source 1, manual pressure reducing valve 2, gas safety valve 3, air inlet valve 4, gas pressure gauge 5, gas flow meter 6, exhaust valve 7, dryer 8, oxygen / carbon dioxide sensor 9, gas outlet 10, pure oxygen source 11, water inlet 12, water inlet centrifugal pump 13, water inlet check valve 14, sampling / venting valve 15, circulating water tank 16, pressure solenoid valve 17, water outlet 18, multi-water quality analyzer 19, circulating centrifugal pump 20, liquid pressure relief valve 21, water outlet pipeline valve 22, Y-type filter 23, water outlet check valve 24, pressure regulating valve 25, liquid pressure gauge 26, and MABR reactor body 27.

[0031] Example 2: As Figure 1 , Figure 2 As shown, an integrated MABR device for treating aerospace wastewater includes a PLC control device, an inlet water system, an outlet water system, a circulating water system monitoring device, an air source supply device, a pure oxygen source supply device, and a liquid-solid separation device.

[0032] The PLC control unit includes equipment such as gas flow meters, gas / liquid pressure gauges, and multiple water quality analyzers, as well as related components such as controlled gas sources, centrifugal pumps, gas valves, and water valves. The monitoring equipment data is transmitted to the PLC control unit, which then analyzes the data feedback and adjusts the switching of the controlled equipment.

[0033] The inlet and outlet water circuit devices include an inlet centrifugal pump 13, a check valve 14, a MABR housing 27, a circulating water tank 16, a pressure solenoid valve 17, a liquid pressure gauge 26, an outlet water pipeline valve 22, a Y-type filter 23, an outlet water check valve 24, and a pressure regulating valve 25.

[0034] The liquid-solid separation filtration device, consisting of an outlet pipeline valve 22, a Y-type filter 23, an outlet check valve 24, and a pressure regulating valve 25, is designed with one unit in use and one unit on standby.

[0035] The circulating water monitoring device includes a MABR housing 28, a circulating water tank 16, a liquid pressure gauge 26, a liquid pressure relief valve 21, a circulating centrifugal pump 20, and a multi-water quality analyzer 19.

[0036] An air oxygen supply device using air as the gas source includes a manual pressure reducing valve 2, a gas safety valve 3, an inlet air passage valve 4, a MABR housing 27, a gas pressure gauge 5, a gas flow meter 6, an exhaust air passage valve 7, a gas dryer 8, and an oxygen / carbon dioxide sensor 9.

[0037] When pure oxygen is used as the gas source, the pure oxygen supply device includes a manual pressure reducing valve 2, a gas safety valve 3, an inlet gas valve 4, a MABR housing 27, a gas pressure gauge 5, and an exhaust gas valve 7.

[0038] A MABR integrated treatment method for aerospace wastewater includes the following steps:

[0039] The aerospace mixed wastewater to be treated is pressurized by the inlet centrifugal pump 13 and pumped into the MABR tank. At this time, the circulating centrifugal pump 20 stops running. The water injection frequency is once a day. The wastewater is mixed in the MABR tank. The outlet pipeline valve 22 opens after a 5-second delay. Affected by the outlet pressure, the treated wastewater is continuously discharged from the circulating water tank through the liquid-solid separation filter device to the outside of the device. The reactor is ready to start the degradation treatment of the next batch of wastewater.

[0040] When the liquid-solid separation filtration unit starts up, the treated wastewater is discharged outside the unit through the liquid-solid separation device consisting of outlet valve 22, Y-type filter 23, outlet check valve 24, and pressure regulating valve 25. Simultaneously, the PLC monitors the system pressure during liquid-solid separation via liquid pressure gauge 26. When the pressure exceeds the system's design safety value, it prompts the need to replace the Y-type filter 23 in the corresponding pipeline and switch to the standby liquid-solid separation unit. Furthermore, if the system pressure is higher than the design value when both separation units are in use, the PLC controls the pressure solenoid valve 17 to open in an emergency, discharging some wastewater outside the unit. To further maintain the stable operation of the MABR unit, the connecting components and pipelines should be inspected and repaired at this time.

[0041] After the water intake is completed, the inlet centrifugal pump 13 stops running, the inlet check valve 14 prevents backflow of liquid inside the device, and the drain valve 22 is closed. After a 10-second delay, the circulating centrifugal pump 20 is started, the circulation device starts, and the wastewater to be treated mixes with the residual water in the circulating water tank, which helps to reduce the organic load (F / M) of the MABR treated wastewater. The wastewater forms a circulating water path along the pipeline, and the sewage continuously passes over the biofilm surface on the membrane fibers, continuously reducing the pollutant concentration.

[0042] When the gas source is air, the corresponding inlet valve 4 and outlet valve 7 are opened, and the gas supply pressure is maintained within the range of 0.005 MPa to 0.02 MPa. The default oxygen content is approximately 21%. Under this condition, oxygen supply adopts a loop circulation mode: air enters the MABR chamber 28 through the manual pressure reducing valve 2 and the gas safety valve 3. The air is then supplied with oxygen to the microorganisms along the internal membrane filaments under pressure. Unused air is transported through the pipeline through the gas pressure gauge 5 and the gas flow meter 6 and then enters the dryer 8 for dehumidification. The oxygen / carbon dioxide sensor 9 monitors the corresponding data. When the oxygen content is >15%, the air continues to be recycled; when the oxygen content is ≤15%, the gas in the pipeline stops circulating, the gas in the pipeline is emptied, and fresh air is replenished to continue supplying oxygen to the device. At this time, the oxygen content is monitored to recover to >15%, and the oxygen supply device operates in loop mode again.

[0043] When the gas supply source is pure oxygen, the corresponding inlet valve 4 is open, and the exhaust valve 7 is normally closed. The gas supply pressure range is 0.005 MPa to 0.1 MPa. The default oxygen content is higher than 99%. When supplying pure oxygen to the MABR unit, a single-end oxygen supply mode is adopted; that is, pure oxygen enters the MABR chamber through the manual pressure reducing valve 2 and the gas safety valve 3, and air then supplies oxygen to the microorganisms along the internal membrane fibers. When the gas supply pressure is lower than 0.005 MPa, the gas source will supplement with pure oxygen, and supplementation will stop when the gas supply pressure is within the required range.

[0044] In addition, a liquid pressure gauge 26 is installed in the MABR water tank to detect the stability of the device operation; an emptying valve / sampling valve is installed at the bottom of the MABR water tank to meet the relevant experimental research of microorganisms under microgravity conditions.

[0045] Example 3: As Figure 1 , Figure 2 As shown, an integrated MABR treatment method for aerospace wastewater includes the following steps: The MABR integrated system is controlled by a PLC system to switch on and off each component. The aerospace mixed wastewater to be treated is pressurized by a pump and mixed in the MABR tank. At the same time, under the action of system pressure, the previously treated wastewater is discharged outside the device through a liquid-solid separation filter. During this period, the PLC system monitors the system safety. After the water intake is completed, the system starts to mix the wastewater to be treated with the residual water in the circulating water tank. The wastewater continuously passes over the surface of the biofilm, reducing the concentration of pollutants. When the gas source is air, the corresponding air intake path is opened. When the gas source is pure oxygen, the corresponding gas path is opened, adopting a single-end oxygen supply mode. The gas supply pressure is maintained within a predetermined range. When the oxygen content is lower than its predetermined value, the PLC system controls the gas path system to supplement the supply of fresh oxygen.

[0046] It includes a PLC control system, inlet and outlet water systems, circulating water (monitoring) system, air supply system, pure oxygen supply system, and liquid-solid separation system. This integrated system can meet the needs of scientific management and real-time monitoring of MABR operation, and provide timely feedback on wastewater treatment status.

[0047] The inlet and outlet water system includes an inlet centrifugal pump, a check valve, a MABR tank, a circulating water tank, a pressure solenoid valve, a liquid pressure gauge, an outlet pipeline valve, a Y-type filter, an outlet check valve, and a pressure regulating valve. When the inlet and outlet water system is running, the aerospace mixed wastewater to be treated is pressurized by the inlet centrifugal pump and pumped into the MABR tank. The wastewater mixes in the MABR tank, and the outlet pipeline valve opens with a delay. Due to the influence of the outlet pressure, the treated wastewater is continuously discharged from the circulating water tank through the liquid-solid separation filtration device to the outside of the reactor, preparing the reactor to begin the degradation treatment of the next batch of wastewater.

[0048] The circulating water system (monitoring) includes a MABR enclosure, a circulating water tank, a liquid pressure gauge, a liquid pressure relief valve, a circulating centrifugal pump, and multiple water quality analyzers. When the circulating water system (monitoring) is running, the drain valve is closed, the circulating centrifugal pump starts after a delay, and the circulation device mixes the wastewater to be treated with the residual water in the circulating water tank. The wastewater continuously passes over the biofilm surface on the membrane fibers, causing the pollutant concentration to continuously decrease. Simultaneously, the water quality monitoring instruments periodically measure water quality indicators and feed them back to the PLC system.

[0049] The air supply system includes a manual pressure reducing valve 2, a gas safety valve 3, an inlet gas path valve 4, a MABR housing 27, a gas pressure gauge 5, a gas flow meter 6, an exhaust gas path valve 7, a gas dryer 8, and an oxygen / carbon dioxide sensor 9. When the air supply system is running, the corresponding inlet and exhaust gas path valves open, maintaining the supply pressure within a predetermined range. During oxygen supply in this state: air enters the MABR housing through the manual pressure reducing valve and the gas safety valve. Under pressure, the air supplies oxygen to the microorganisms along the internal membrane filaments. Simultaneously, the gas pressure and flow meter are monitored. The air is then dried by the dryer, and the oxygen / carbon dioxide sensor monitors its concentration. When the concentration falls below a predetermined value, gas circulation in the pipeline stops, the pipeline gas is vented, and fresh air is replenished to continue supplying oxygen to the device.

[0050] The pure oxygen supply system includes a manual pressure reducing valve, a gas safety valve, an inlet gas path valve, a MABR housing, a gas pressure gauge, and an exhaust gas path valve. When the air supply system is running, the corresponding gas path valve is open, and the exhaust gas path valve is normally closed, ensuring the supply pressure remains within a predetermined range. Pure oxygen enters the MABR housing via the manual pressure reducing valve and the gas safety valve. If the supply pressure falls below the set value, the gas source will promptly replenish the pure oxygen.

[0051] As described above, the embodiments of the present invention have been explained in detail. However, many modifications are possible without substantially departing from the inventive point and effects of the present invention, which will be obvious to those skilled in the art. Therefore, all such modifications are also included within the protection scope of the present invention.

Claims

1. A MABR integrated treatment method for aerospace wastewater, comprising an integrated MABR device for treating aerospace wastewater, including a PLC control unit; an air source connected to one end of a manual pressure reducing valve of one air intake device, the other end of which is connected to a gas safety valve, the other end of which is connected to an air intake valve, and the other end of which is connected to the MABR reactor body; a pure oxygen source connected to one end of a manual pressure reducing valve of another air intake device, the other end of which is connected to a gas safety valve, the other end of which is connected to an air intake valve, and the other end of which is connected to the MABR reactor body; the MABR reactor body is connected to one end of a multi-water quality analyzer, a liquid pressure gauge, a gas pressure gauge, an inlet check valve, a sampling / venting valve, and a circulating water tank; and the inlet is connected to one end of an inlet centrifugal pump. The other end of the centrifugal pump is connected to the inlet check valve; the other end of the gas pressure gauge is connected to the gas flow meter; the other end of the gas flow meter is connected to the exhaust gas valve; the other end of the exhaust gas valve is connected to the dryer; the other end of the dryer is connected to the oxygen / carbon dioxide sensor; the other end of the oxygen / carbon dioxide sensor is connected to the gas outlet; the outlet of the circulating water tank is connected to the liquid pressure relief valve; the other end of the liquid pressure relief valve is connected to the circulating centrifugal pump; the other end of the circulating centrifugal pump is connected to the other end of the multi-water quality analyzer; the other end of the circulating water tank is connected to the pressure solenoid valve; the other end of the pressure solenoid valve and one end of the pressure regulating valve are connected to the outlet; the PLC control device is connected to the above components respectively; the outlet pipeline valve, Y-type filter, outlet check valve, and pressure regulating valve are sequentially connected to form a liquid-solid separation filtration device; the two liquid-solid separation filtration devices are respectively connected to the circulating water tank and the outlet. Its features It includes the following steps: Step 1: The MABR integrated system uses a PLC system to control the switching of each component. The aerospace mixed wastewater to be treated is pressurized by a pump after entering the inlet and mixed in the MABR tank. Under the pressure at the outlet, the treated wastewater is discharged outside the device through a liquid-solid separation filter. The PLC simultaneously monitors the system pressure during liquid-solid separation. When the pressure exceeds the system's design safety value, the PLC issues a corresponding warning. Step 2: After the water intake is completed, the circulating centrifugal pump starts after a delay. The wastewater to be treated mixes with the residual water in the circulating water tank. The wastewater continuously passes over the surface of the biofilm, reducing the concentration of pollutants. Step 3: When the gas source is air, the corresponding air intake path opens, air circulates, and the supply pressure is maintained within the set range; when the oxygen content is lower than the predetermined value, the gas circulation in the pipeline stops, and the PLC system controls the switch to replenish fresh air for oxygen supply. Step 4: When the gas source is pure oxygen, the corresponding gas circuit is opened, adopting a single-end oxygen supply mode. The gas supply pressure is maintained within a predetermined range. When the gas supply pressure is lower than the set value, the PLC system controls the gas source switch to supplement the pure oxygen supply. Step 5: The PLC control system monitors the pressure, flow rate, and water quality of gases / liquids in various parts of the system in real time. The monitoring equipment data is transmitted to the PLC control device. The PLC device analyzes the data feedback and adjusts the switching of the controlled equipment. When the air supply system is running, the corresponding inlet and outlet valves are open, maintaining the supply pressure within a predetermined range. Under these conditions, when supplying oxygen: air enters the MABR chamber via a manual pressure reducing valve and a gas safety valve. The air then supplies oxygen to the microorganisms along the internal membrane filaments under pressure, while the gas pressure and flow rate are monitored. Subsequently, the air is dried by a dryer, and oxygen / carbon dioxide sensors monitor their concentration. When the concentration falls below a predetermined value, gas circulation in the pipeline stops, the pipeline gas is vented, and fresh air is replenished to continue supplying oxygen to the device. When the pure oxygen supply system is running, the corresponding gas circuit valve is open, the exhaust gas circuit valve is normally closed, the supply pressure is within the predetermined range, and pure oxygen enters the MABR chamber through the manual pressure reducing valve and the gas safety valve. When the supply pressure is lower than the set value, the gas source will replenish pure oxygen in time.

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