Sewage treatment method and system based on MABR and carbon capture

Abstract

The present application relates to a sewage treatment method and system based on MABR and carbon capture, in the method and system, an MABR reactor can utilize an MABR technology to purify sewage, the purified sewage flows into an algae pool, and other waste gases such as carbon dioxide generated in the process are also introduced into the algae pool, such that the waste gases are discharged into the algae pool. The algae in the algae pool can absorb waste gas such as carbon dioxide to grow, meanwhile, sewage can be purified, the purified sewage can flow into the aquatic plant pool through the algae pool, and aquatic plants conduct secondary purification on the sewage through the self-purification function and discharge the sewage. After the sewage is treated by the treatment device, the carbon emission is reduced, the utilization rate of the treated sewage is improved, and the discharged sewage can reach the emission standard after being purified by a plurality of links, so that the sewage treatment of small and medium-sized sewage treatment plants is more environment-friendly.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment technology, and in particular to a sewage treatment method and system based on MABR and carbon capture. Background Art

[0002] At present, ecological, low-carbon and sustainable sewage treatment technology is a sewage treatment method that can reduce energy consumption, reduce carbon emissions and achieve efficient use of resources.

[0003] Among the related technologies, large-scale sewage treatment plants usually use carbon capture technology and energy recovery technology to treat sewage. Among them, carbon capture technology is to separate and capture carbon dioxide from industrial or energy production-related sources, and use it in geology, chemical or biological ways, or transport it to a suitable site for storage, so that carbon dioxide is isolated from the atmosphere for a long time. Energy recovery technology is based on the law of conservation of energy, and converts waste energy into useful energy by capturing and utilizing it.

[0004] Since carbon capture technology is suitable for sewage treatment plants with large carbon emissions, and energy recovery technology is suitable for sewage treatment plants with large scale and large energy flow, small and medium-sized sewage treatment plants with limited resources will face the problems of high investment cost, high maintenance cost and poor benefits when using the above two technologies to treat sewage. Therefore, small and medium-sized sewage treatment plants currently lack a sewage treatment method with ecological, low-carbon and sustainable effects. Summary of the invention

[0005] In order to make small and medium-sized sewage treatment plants more environmentally friendly when treating sewage, the present application provides a sewage treatment method and system based on MABR and carbon capture.

[0006] The sewage treatment system based on MABR and carbon capture provided in this application adopts the following technical solutions: In the first aspect, the present application provides a sewage treatment method based on MABR and carbon capture, which adopts the following technical solutions: A wastewater treatment method based on MABR and carbon capture, comprising: Connecting the sewage to be purified to the MABR reactor to output a first treated gas and a first treated water body; Inputting a first treated gas and a first treated water body into an algae pond to output a second exhaust gas and a second treated water body, wherein the second exhaust gas is used for exhaustion; The second treated water body is input into the aquatic plant pond to obtain the third discharged water body.

[0007] By adopting the above technical solution, the MABR reactor can use MABR technology to purify sewage. The purified sewage flows into the algae pool. The carbon dioxide and other waste gases generated in this process are also passed into the algae pool, so that the algae in the algae pool can absorb carbon dioxide and other waste gases for growth. At the same time, it can also purify the sewage. The purified sewage will also flow into the aquatic plant pool through the algae pool. The aquatic plants use their self-purification function to purify the sewage for a second time and discharge it. After being treated by the treatment device, carbon emissions are reduced, the utilization rate of treated sewage is improved, and the discharged sewage can meet the emission standards after purification in multiple links, so that small and medium-sized sewage treatment plants can be more green and environmentally friendly when treating sewage.

[0008] Optionally, also include: The first treated water body is input into a sedimentation tank to output a fourth output water body and a fourth discharge water body, wherein the fourth output water body is used to input into the algae pond and the fourth discharge water body is used for discharge.

[0009] Optionally, also include: After the first treated water body is input into the sedimentation tank, the sedimentation tank (2) also outputs fourth return sludge, and the fourth return sludge is used to be input into the MABR reactor.

[0010] Optionally, the MABR reactor is a closed structure, and activated sludge is inoculated in the MABR reactor. The concentration of the activated sludge is 6~10 mg / L, the hydraulic retention time is 8~10 h, the dissolved oxygen content in the pool is 0.6~1.2 mg / L, the air supply pressure at the air inlet of the MABR reactor is 0~60 KPa, and the speed of the agitator in the MABR reactor is 100~150 rpm.

[0011] Optionally, the working rate of the sedimentation tank is 0.2~0.3m / h.

[0012] In a second aspect, the present application provides a sewage treatment system based on MABR and carbon capture, including a MABR reactor, an algae pool and an aquatic plant pool; The MABR reactor is used to purify the introduced sewage using MABR technology; The algae pool is respectively connected to the exhaust port of the MABR reactor and the drain port of the MABR reactor, and is used to cultivate algae using exhaust gas and treated sewage, purify sewage, and release oxygen; The aquatic plant pool is connected to the drain outlet of the algae pool and is used for cultivating aquatic plants. The aquatic plants are used to absorb harmful substances in the sewage flowing out of the algae pool, and the treated sewage flows out through the drain outlet of the aquatic plant pool.

[0013] By adopting the above technical solution, the MABR reactor can use MABR technology to purify sewage. The purified sewage flows into the algae pool. The carbon dioxide and other waste gases generated in this process are also passed into the algae pool, so that the algae in the algae pool can absorb carbon dioxide and other waste gases for growth. At the same time, it can also purify the sewage. The purified sewage will also flow into the aquatic plant pool through the algae pool. The aquatic plants use their self-purification function to purify the sewage for a second time and discharge it. After being treated by the treatment device, carbon emissions are reduced, the utilization rate of treated sewage is improved, and the discharged sewage can meet the emission standards after purification in multiple links, so that small and medium-sized sewage treatment plants can be more green and environmentally friendly when treating sewage.

[0014] Optionally, a sedimentation tank is also included; The water inlet of the sedimentation tank is connected to the drain outlet of the MABR reactor, and the drain outlet of the sedimentation tank is connected to the water inlet of the algae pond. The sedimentation tank is used to separate sewage and sludge, and the treated sewage flows out through the drain outlet of the sedimentation tank.

[0015] By adopting the above technical solution, the sedimentation tank can separate the treated sewage from the sludge, avoid discharging the sludge together with the sewage, and reduce the amount of sludge discharged.

[0016] Optionally, the sedimentation tank is provided with a mud discharge port, and the mud discharge port of the sedimentation tank is connected to the mud inlet of the MABR reactor and is connected to the outside world.

[0017] By adopting the above technical solution, the sludge can be returned to the MABR reactor as much as possible, thereby reducing the amount of sludge discharged.

[0018] Optionally, the MABR reactor is a closed structure, and activated sludge is inoculated in the MABR reactor. The concentration of the activated sludge is 6~10 mg / L, the hydraulic retention time is 8~10 h, the dissolved oxygen content in the pool is 0.6~1.2 mg / L, the air supply pressure at the air inlet of the MABR reactor is 0~60 KPa, and the speed of the agitator in the MABR reactor is 100~150 rpm.

[0019] Optionally, the working rate of the sedimentation tank is 0.2~0.3m / h.

[0020] Optionally, the sedimentation tank is a vertical flow sedimentation tank, a horizontal flow sedimentation tank, or a co-pipe sedimentation tank.

[0021] Optionally, the algae pond includes a water storage tank and an air chamber; A plant growth lamp is arranged in the water storage tank, the water storage tank is used to store water for algae growth, and a filter is arranged at the drain outlet of the water storage tank; The air chamber is located above the water storage tank, the air inlet of the air chamber is connected to the exhaust port of the MABR reactor, and the exhaust port of the air chamber is connected to the outside.

[0022] Optionally, the system is further configured with a control module, and the control module is configured to: Acquiring real-time operating parameters, wherein the operating parameters are parameters that affect carbon emissions, mud emissions, and pollutant content in sewage in the sewage treatment system based on MABR and carbon capture; When one of the operating parameters does not meet the corresponding normal parameter range, Retrieving a parameter change model, wherein the parameter change model includes each operating parameter that changes when each controllable parameter is adjusted by different amounts, and the duration for the operating parameter to reach a stable state, wherein the controllable parameter is a parameter that has an influence on the operating parameter and is controllable; Based on the parameter change model, determining a plurality of adjustment schemes according to the operating parameters that do not conform to the normal parameter range; Determine the comprehensive cost of each of the adjustment options; Selecting the adjustment plan with the lowest comprehensive cost as the final plan; The controllable parameters involved are adjusted according to the final solution.

[0023] By adopting the above technical solution, when the real-time carbon emissions, mud emissions or pollutant content in the sewage treatment system based on MABR and carbon capture is about to exceed the emission standards, multiple adjustment plans can be obtained according to the parameter change model and the real-time operating parameters, and then the adjustment plan with the lowest comprehensive cost is selected to adjust the corresponding operating parameters, so that the sewage treatment system based on MABR and carbon capture can reach an operating state that meets the emission standards.

[0024] Optionally, the determining a plurality of adjustment schemes based on the parameter change model and according to the operating parameters that do not conform to the normal parameter range includes: Determine all controllable parameters in the parameter variation model that affect the operating parameters that do not conform to the normal parameter range, and record them as target controllable parameters; Determine, according to the parameter variation model, the target controllable parameter so that the first variable required when the operating parameter that does not meet the normal parameter range reaches the normal parameter range; Determine, according to the parameter change model, a second variable generated by the affected operating parameter after the target controllable parameter adjusts the first variable; Determine an operating parameter at which the second variable cannot maintain the corresponding operating parameter within a normal parameter range, and record the parameter as a target operating parameter; Based on the parameter change model, determining a newly added controllable parameter and a corresponding third variable according to the target operating parameter and the corresponding second variable; Determine an adjustment plan according to the target controllable parameter, the first variable, the newly added controllable parameter and the third variable; Each of the target controllable parameters is traversed to obtain multiple adjustment schemes.

[0025] Optionally, determining the comprehensive cost of each adjustment plan includes: Determining the number of controllable parameters that need to be adjusted according to the adjustment scheme, and the adjustment amount of each controllable parameter that needs to be adjusted; Determining the influence between the controllable parameters that need to be adjusted; Determining, according to the parameter change model, the time required to adjust the operating parameter that does not conform to the normal parameter range to the normal parameter range; The comprehensive cost is determined according to the number of controllable parameters that need to be adjusted, the adjustment amount of each controllable parameter that needs to be adjusted, the impact degree, and the time required to adjust the operating parameters that do not meet the normal parameter range to the normal parameter range.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: In this application, the MABR reactor can use MABR technology to purify sewage. The purified sewage flows into the algae pool. The carbon dioxide and other waste gases generated in this process are also passed into the algae pool, so that the algae in the algae pool can absorb carbon dioxide and other waste gases for growth. At the same time, it can also purify the sewage. The purified sewage will also flow into the aquatic plant pool through the algae pool. The aquatic plants purify the sewage for a second time through the self-purification function and discharge it. After being treated by the treatment device, carbon emissions are reduced, the utilization rate of treated sewage is improved, and the discharged sewage can meet the emission standards after purification in multiple links, so that small and medium-sized sewage treatment plants can be more green and environmentally friendly when treating sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a sewage treatment system based on MABR and carbon capture in an embodiment of the present application.

[0028] Figure 2 It is a flow chart of a control method configured in a control module of a sewage treatment system based on MABR and carbon capture according to an embodiment of the present application.

[0029] Explanation of the accompanying drawings: 1. MABR reactor; 2. Sedimentation tank; 3. Algae pond; 31. Water storage tank; 32. Air chamber; 33. Plant growth lamp; 34. Filter; 4. Aquatic plant pond; 5. One-way valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-2 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] The embodiment of the present application discloses a sewage treatment system based on MABR and carbon capture.

[0032] Reference Figure 1 The sewage treatment system based on MABR and carbon capture includes a MABR reactor 1, a sedimentation tank 2, an algae pool 3, and an aquatic plant pool 4. The MABR reactor 1, the sedimentation tank 2, the algae pool 3, and the aquatic plant pool 4 are connected by pipelines to achieve sewage treatment and purification. The carbon dioxide generated in the process of sewage treatment can also be absorbed by the algae cultivated in the algae pool 3, thereby making the carbon emissions and sewage discharged by small and medium-sized sewage treatment plants meet the discharge requirements.

[0033] Specifically, the MABR reactor 1 is used to purify the introduced sewage using the MABR technology.

[0034] Among them, MABR technology is a new type of sewage treatment technology that combines gas membrane technology and biofilm technology for bubble-free oxygen supply, heterogeneous mass transfer and layered structure. MABR technology uses microporous membranes or air-permeable dense membranes for bubble-free oxygen supply. Oxygen and nutrients enter the biofilm from both sides of the biofilm attached to the membrane. In addition to the mass transfer resistance, there is a concentration gradient of oxygen and nutrients in the biofilm, showing a stratification of aerobic, anoxic and anaerobic zones. This allows the nitrification and denitrification process to be achieved simultaneously on the biofilm, thereby achieving one-stage denitrification and carbon removal. Taking nitrification and denitrification as an example, due to the very obvious concentration gradient of oxygen and substrate inside the microbial membrane, the dissolved oxygen concentration in the outermost layer is low, and the organic carbon source is sufficient, which is suitable for the denitrification reaction; while in the inner layer of the biofilm, the dissolved oxygen concentration is very high and the organic carbon concentration is low, which is suitable for the nitrification reaction. Therefore, MABR is very suitable for completing the function of simultaneous nitrification, denitrification and denitrification.

[0035] Specifically, the MABR reactor 1 is a relatively closed reaction tank, and the sewage to be treated is passed into the reaction tank. The reaction tank is equipped with a MABR membrane assembly, which is mainly composed of an aeration membrane and a microbial membrane attached to the aeration membrane. Among them, air / oxygen enters the aeration membrane assembly under a certain pressure, and oxygen penetrates the aeration membrane to the microbial membrane. Due to the concentration gradient, oxygen also diffuses through the microbial membrane into the sewage and is used by aerobic microorganisms in the microbial membrane and sewage, such as ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB). At the same time, wastewater pollutants penetrate into the interior of the biofilm, forming a counter-diffusion mechanism applicable to both aerobic bacteria and anaerobic bacteria, promoting nitrogen removal in a symbiotic and controllable environment. The anoxic zone at the biofilm-liquid interface is more suitable for the growth of denitrifying bacteria. Therefore, denitrification and carbon removal can be achieved by using a single biofilm system to simultaneously carry out nitrification and denitrification reactions.

[0036] Specifically, the MABR reactor 1 is a closed structure, and is provided with a water inlet, a drain outlet, an air inlet, an exhaust outlet and a mud inlet. The water inlet is used for sewage to flow in. The drain outlet is used for the treated sewage to flow out. The air inlet is used for compressed oxygen or air to flow into the MABR membrane assembly. The exhaust outlet is used for exhausting waste gases such as carbon dioxide generated when purifying sewage. The mud inlet is used to pass sludge.

[0037] Here, the MABR membrane assembly in the MABR reactor 1 can be a blind-end structure, or the MABR membrane assembly can be configured with an outlet. By controlling the outlet, the discharge of waste gas and wastewater generated by the reaction in the MABR membrane assembly can be controlled, which is beneficial to improving the oxygen supply concentration of the MABR membrane assembly.

[0038] A mixer is also provided inside the MABR reactor 1. Activated sludge is pre-planted inside the MABR reactor 1, and a MABR membrane is also placed. When sewage is pumped into the MABR reactor 1, and oxygen (or other oxygen-containing gases such as air) is delivered to the MABR reactor 1 using an oxygen generator or a blower, oxygen diffuses in the water body along the MABR membrane fibers to the membrane wall, and there is sufficient oxygen around the MABR membrane wall. Activated sludge gathers on the membrane wall to form a biofilm, and oxygen passes through the membrane wall into the biofilm. Due to the concentration gradient, oxygen diffuses through the entire biofilm layer into the wastewater and is used by aerobic microorganisms in the biofilm, such as ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB). At the same time, wastewater pollutants penetrate into the interior of the biofilm, forming a counter-diffusion mechanism applicable to both aerobic and anaerobic bacteria, and promoting nitrogen removal in a symbiotically controllable environment. The anoxic zone at the biofilm-liquid interface is more suitable for the growth of denitrifying bacteria. Therefore, denitrification and carbon removal can be achieved by using a single biofilm system to simultaneously carry out nitrification and denitrification reactions.

[0039] It is understandable that in the above-mentioned biochemical reaction process, the oxygen delivered by the oxygen generator or the blower enters the MABR biofilm under the drive of the pressure difference, and the oxygen pressure is always kept below the bubble point pressure of the MABR biofilm, which can ensure that the oxygen is transmitted while avoiding the generation of bubbles, resulting in the discharge of waste gas containing aerosols and volatile organic compounds to the outside world. At the same time, by controlling the operation of the agitator, the mud-water mixture in the MABR reactor 1 can be made to reach a completely mixed state, so that the biochemical reaction can be carried out more fully to achieve the effect of purifying sewage. Since the MABR technology does not require the use of compressed air for aeration, it can significantly reduce energy consumption. And because oxygen enters the MABR biofilm through a free diffusion mechanism, it can improve the oxygen mass transfer efficiency and further reduce energy consumption.

[0040] In order to achieve the above effects, in the embodiment of the present application, the MABR membrane can be selected as a permeable membrane such as a selective permeable membrane to prevent pollutants in the sewage from entering the MABR biofilm. Further, the concentration of the activated sludge is controlled to be maintained at 6~10mg / L, the hydraulic retention time is 8~10h, the air supply pressure is maintained at 0~60KPa, the dissolved oxygen content is controlled at 0.6~1.2mg / L, and the speed of the mixer is maintained at 100~150rpm.

[0041] The water inlet of the sedimentation tank 2 is connected to the outlet of the MABR reactor 1 through a pipeline, and the sedimentation tank 2 is used to separate sewage and activated sludge.

[0042] It is understandable that although the sewage discharged from the MABR reactor 1 is sewage after biochemical reaction, it will be mixed with a certain amount of activated sludge. If the sewage with activated sludge is discharged to the outside for a long time, it will also have a certain impact on the ecology. Therefore, it is necessary to separate the sewage from the activated sludge through the sedimentation tank 2.

[0043] In some specific embodiments, the sedimentation tank 2 can be a vertical flow sedimentation tank 2, a horizontal flow sedimentation tank 2 or a co-pipe sedimentation tank 2. The working speed of the sedimentation tank 2 needs to be controlled at 0.2-0.3 m / h. The sewage treated by the sedimentation tank 2 flows out from its drain port.

[0044] In some specific embodiments, the sedimentation tank 2 may also be provided with a mud discharge port. The pipe connected to the mud discharge port of the sedimentation tank 2 is not only connected to the outside world, but also connected to the mud inlet of the MABR reactor 1. In actual application scenarios, after the sewage treatment system based on MABR and carbon capture has been running for a period of time, the amount of activated sludge in the MABR reactor 1 will decrease, and the amount of activated sludge accumulated in the sedimentation tank 2 will increase. In order to minimize the discharge of sludge to the outside world, the sludge in the sedimentation tank 2 will first be returned to the MABR reactor 1 until the amount of sludge in the MABR reactor 1 reaches the corresponding threshold value, and then the sludge in the sedimentation tank 2 will be discharged to the outside world. This can reduce the amount of sludge discharged to the outside world. To this end, it is also necessary to respectively set a one-way valve 5 on the pipe connecting the mud discharge port to the outside world and on the pipe connecting to the mud inlet of the MABR reactor 1.

[0045] The algae pool 3 is connected to the exhaust port of the MABR reactor 1 and the drain port of the sedimentation tank 2 respectively, and is used to utilize waste gas such as carbon dioxide and treated sewage to cultivate algae, purify sewage, and release oxygen.

[0046] Specifically, the algae pond 3 includes two parts: a water reservoir 31 and an air chamber 32. The water inlet of the water reservoir 31 is connected to the drain outlet of the sedimentation tank 2 through a pipe. The water reservoir 31 is used to store water for algae growth. In order to provide a good living environment for algae, a plant growth lamp 33 is also provided in the water reservoir 31. In order to prevent algae from flowing out of the drain outlet of the water reservoir 31 along the direction of water flow, a filter 34 is also provided at the drain outlet of the water reservoir 31.

[0047] The air chamber 32 is located above the water storage tank 31, and the air inlet of the air chamber 32 is connected to the exhaust port of the MABR reactor 1 through a pipeline, and the exhaust port of the air chamber 32 is connected to the outside.

[0048] It can be understood that algae, as a type of single-cell microorganism with extremely high photosynthetic efficiency, can not only efficiently absorb carbon dioxide and release oxygen through photosynthesis, but also convert carbon dioxide into various biologically active substances such as protein, oil, polysaccharide, etc. In some specific embodiments, Spirulina can be selected as the main algae in the algae pond 3 for cultivation. In addition, algae can also use the self-purification function to perform secondary purification on the treated sewage.

[0049] Similarly, in order to facilitate the control of the direction of water flow, a one-way valve 5 needs to be installed on the pipe connecting the drain outlet of the sedimentation tank 2 and the water inlet of the algae pond 3.

[0050] In a specific embodiment, a plurality of algae ponds 3 may be provided. The air inlet of each algae pond 3 is connected to the exhaust port of the MABR reactor 1.

[0051] The aquatic plant pool 4 is connected to the drain outlet of the algae pool 3 and is used to cultivate aquatic plants, and utilize the aquatic plants to absorb harmful substances in the sewage flowing out of the algae pool 3. Similarly, a plant growth lamp 33 is also provided in the aquatic plant pool 4. Since the aquatic plants cultivated in the aquatic plant pool 4 also have a self-purification function, the sewage flowing into the aquatic plant pool 4 from the algae pool 3 can be purified under the self-purification effect of the aquatic plants, and then the sewage discharged from the drain outlet of the aquatic plant pool 4 can meet the discharge standard.

[0052] Of course, in some specific embodiments, it is also possible to choose not to set up the sedimentation tank 2, and directly connect the water inlet of the algae pool 3 to the outlet of the MABR reactor 1. Compared with the above-mentioned solution, this solution may result in an increase in the amount of discharged sludge.

[0053] In order to facilitate the control of the sewage treatment system based on MABR and carbon capture, the system is also equipped with a control module, and a control method is configured in the control module. The control method is applied to the control module equipped with the sewage treatment system based on MABR and carbon capture disclosed in the above embodiment, and can adjust various operating parameters of the sewage treatment system based on MABR and carbon capture in real time, so that the carbon emissions, mud emissions and pollutant content in the sewage treatment system based on MABR and carbon capture can be maintained within the emission standards for a long time.

[0054] Reference Figure 2 The control method is mainly aimed at the situation that one of the operating parameters in the sewage treatment system based on MABR and carbon capture does not meet the corresponding normal parameter range. The control method configured in the control module specifically includes the following steps: Step S100: Acquire real-time operating parameters.

[0055] The operating parameters are parameters that affect carbon emissions, sludge emissions, and pollutant content in sewage in the sewage treatment system based on MABR and carbon capture. The operating parameters can be obtained through various sensor devices set in the sewage treatment system based on MABR and carbon capture.

[0056] Step S200: Retrieve parameter change model.

[0057] The parameter variation model includes each operating parameter that changes when each controllable parameter is adjusted by different amounts, and the duration for the operating parameter to reach a stable state. A controllable parameter is a parameter that has an impact on the operating parameter and is controllable.

[0058] It is understandable that when adjusting a controllable parameter, the amount of change in the controllable parameter may affect different numbers of operating parameters, and may also affect the amount of change in each operating parameter. Therefore, it is necessary to obtain corresponding data through multiple tests to establish an accurate parameter change model. When adjusting a controllable parameter, it is possible to determine whether the operating parameter has reached a stable state based on the fluctuation range of the same operating parameter over a period of time, that is, to pre-set an allowable fluctuation range threshold corresponding to the stable state. When the fluctuation range of the same operating parameter over a period of time is within the allowable fluctuation range threshold, it can be considered that the operating parameter has reached a stable state.

[0059] After the parameter change model is established, the parameter change model can be pre-stored in a device with a storage function such as a memory. When the operating parameters of the sewage treatment system based on MABR and carbon capture need to be adjusted, the parameter change model can be retrieved.

[0060] Step S300: Based on the parameter change model, multiple adjustment schemes are determined according to the operating parameters that do not conform to the normal parameter range.

[0061] Optionally, step S300 includes the following steps: (step S310 to step S370) Step S310: Determine all controllable parameters in the parameter variation model that have an impact on the operating parameters that do not conform to the normal parameter range, and record them as target controllable parameters.

[0062] It is understandable that when a controllable parameter is adjusted, as the change amount of the controllable parameter increases, the affected operating parameters will also increase. Therefore, if an operating parameter is to be adjusted, it can be achieved by adjusting different controllable parameters. Since the parameter change model records the operating parameters affected when each controllable parameter is adjusted, all controllable parameters that affect the operating parameters that do not meet the normal parameter range can be determined according to the parameter change model, and these controllable parameters are recorded as target controllable parameters.

[0063] Since different target controllable parameters can be selected as the main controllable parameters to adjust the operating parameters that do not conform to the normal parameter range, multiple adjustment schemes can be obtained.

[0064] The following specifically describes the method of determining the adjustment plan by selecting a target controllable parameter as the controllable parameter to be mainly adjusted.

[0065] Step S320: determining the target controllable parameter according to the parameter change model to obtain a first variable required when the operating parameter that does not meet the normal parameter range reaches the normal parameter range.

[0066] It should be noted that when determining the change required for an operating parameter that does not meet the normal parameter range to reach the normal parameter range, the middle value of the normal parameter range corresponding to the operating parameter can be used as the standard value, so as to ensure that the various emissions of the adjusted MABR and carbon capture-based sewage treatment system can continuously meet the emission standards.

[0067] Further, when it is determined that the change amount required for the operating parameter that does not conform to the normal parameter range to reach the corresponding standard value, the first variable of each target controllable parameter can be determined according to the parameter change model.

[0068] Step S330: determining, according to the parameter change model, a second variable generated by the affected operating parameter after the target controllable parameter adjusts the first variable.

[0069] It can be understood that although the operating parameters that do not meet the normal parameter range can be brought into the normal parameter range after adjusting the target controllable parameter by the first variable, it will also affect other operating parameters and may even cause individual operating parameters that are within the normal parameter range to exceed the normal parameter range. Therefore, it is necessary to calculate the second variable generated by all affected operating parameters after adjusting the target controllable parameter by the first variable based on the parameter change model.

[0070] Step S340: Determine an operating parameter at which the second variable cannot maintain the corresponding operating parameter within a normal parameter range, and record it as a target operating parameter.

[0071] Specifically, the current value of the operating parameter is superimposed with the corresponding second variable, and the superimposed result is compared with the normal parameter range corresponding to the operating parameter, so as to determine the operating parameter whose superimposed result exceeds the corresponding normal parameter range and record it as the target operating parameter. Further adjustments are required so that the target operating parameter can be maintained within the normal parameter range.

[0072] It is worth noting that considering that the carbon emissions, mud emissions, and pollutant content of sewage treated by the sewage treatment system based on MABR and carbon capture must be continuously maintained within the emission standards, it is necessary to set the threshold of the parameter range. When the superimposed result exceeds the corresponding parameter range threshold, the corresponding operating parameter is recorded as the target operating parameter.

[0073] Step S350: Based on the parameter change model, determine a newly added controllable parameter and a corresponding third variable according to the target operating parameter and the corresponding second variable.

[0074] Among them, the newly added controllable parameters are controllable parameters that can adjust the target operating parameters and will not affect the operating parameters affected by the aforementioned target controllable parameters.

[0075] After the first variable is determined, the operating parameters that do not meet the normal parameter range can reach the normal parameter range, and the target operating parameters will exceed the corresponding normal parameter range. Similarly, the middle value of the normal parameter range can be used as the standard value, and the change amount required to adjust the target operating parameter can be determined based on the current value of the target operating parameter and the second variable.

[0076] Furthermore, it is necessary to first determine the newly added controllable parameters according to the parameter change model, that is, to find the controllable parameters that can adjust the target operating parameters and will not affect the operating parameters affected by the aforementioned target controllable parameters from the parameter change model. If there are no controllable parameters that meet the aforementioned conditions, the controllable parameters that have the least impact on the operating parameters affected by the aforementioned target controllable parameters can be selected.

[0077] Then, the change amount of the newly added controllable parameter is determined according to the change amount of the target operating parameter that needs to be adjusted, that is, the change amount of the newly added controllable parameter required to make the target operating parameter reach the normal parameter range, that is, the third variable.

[0078] Step S360: determining an adjustment plan according to the target controllable parameter, the first variable, the newly added controllable parameter and the third variable.

[0079] After the target controllable parameters, the first variables of the target controllable parameters, the newly added controllable parameters and the third variables of the newly added controllable parameters are determined, an adjustment plan can be formed by the determined target controllable parameters, the first variables of the target controllable parameters, the newly added controllable parameters and the third variables of the newly added controllable parameters.

[0080] It is understandable that if multiple different newly added controllable parameters can be determined in the parameter change model, different adjustment schemes can be obtained according to different newly added controllable parameters. In other words, when a certain target controllable parameter is used as the main controllable parameter to be adjusted, one or more adjustment schemes can be obtained.

[0081] In some specific embodiments, if after determining the target controllable parameters, the first variables of the target controllable parameters, the newly added controllable parameters and the third variables of the newly added controllable parameters, there are still operating parameters that exceed the normal parameter range, then the controllable parameters that need to be adjusted and the required adjustment amount can continue to be determined according to the above method.

[0082] Step S370: traverse each of the target controllable parameters to obtain multiple adjustment schemes.

[0083] By traversing each target controllable parameter according to the above method, one or more adjustment schemes can be obtained. After the traversal is completed, multiple adjustment schemes can be obtained.

[0084] Step S400: Determine the comprehensive cost of each of the adjustment plans.

[0085] It is understandable that each adjustment plan is different and requires different comprehensive costs. When selecting an adjustment plan as the final plan, it should be as efficient, low-carbon and energy-saving as possible.

[0086] Among them, the comprehensive cost mainly considers the number of controllable parameters to be adjusted, the corresponding adjustment amount, the degree of correlation between the controllable parameters, and the time required to adjust the operating parameters that do not meet the normal parameter range to the normal parameter range.

[0087] Specifically, firstly, the number of controllable parameters that need to be adjusted for each adjustment scheme and the adjustment amount of each controllable parameter that needs to be adjusted are determined.

[0088] Then, the influence degree between the controllable parameters that need to be adjusted is determined. The greater the influence degree between the controllable parameters, the greater the difficulty of adjusting the operating parameters that do not meet the normal parameter range to the normal parameter range, and the more complicated the steps.

[0089] In a specific embodiment, the influence between controllable parameters can be measured by the overlap between the operating parameters affected by one controllable parameter and the operating parameters affected by another controllable parameter. That is, the higher the overlap, the higher the influence. Of course, two interrelated operating parameters can be regarded as overlapping operating parameters. In a specific example, if controllable parameter A1 affects operating parameter B1 and operating parameter B2, and controllable parameter A2 affects operating parameter C1, operating parameter C2 and operating parameter C3, wherein operating parameter B2 and operating parameter C1 have a certain proportional relationship or inverse relationship, then operating parameter B2 and operating parameter C1 can be considered to be overlapping operating parameters. Specifically, the influence can be calculated in the following manner, that is, influence = number of overlapping operating parameters / sum of the number of operating parameters. Among them, the sum of the number of operating parameters is the number of different operating parameters. Taking the above example, the influence = 1 / 4.

[0090] Of course, if an adjustment scheme involves multiple controllable parameters, the influence between any two controllable parameters can be determined first, and then the maximum influence is selected as the final influence.

[0091] When determining the time required to adjust an operating parameter that does not conform to the normal parameter range to within the normal parameter range, since the adjustment plan involves adjustment of multiple controllable parameters, the time required to adjust each controllable parameter should be considered, that is, the time required to adjust an operating parameter that does not conform to the normal parameter range to within the normal parameter range should be the maximum value of the time required to adjust different controllable parameters.

[0092] Furthermore, the comprehensive cost is determined based on the number of controllable parameters that need to be adjusted, the adjustment amount of each controllable parameter that needs to be adjusted, the impact degree, and the time required to adjust the operating parameters that do not meet the normal parameter range to the normal parameter range.

[0093] In a specific embodiment, the number of controllable parameters that need to be adjusted in each adjustment scheme, as well as the adjustment amount, impact, and time required to adjust the operating parameters that do not meet the normal parameter range to the normal parameter range of each controllable parameter that needs to be adjusted can be quantified to obtain corresponding scores, and then the average value of each adjustment scheme is calculated to obtain the comprehensive cost.

[0094] For the number of controllable parameters that need to be adjusted, you can first determine the minimum number of controllable parameters that need to be adjusted in all adjustment schemes, and quantify the number of controllable parameters that need to be adjusted in this adjustment scheme as 100%. The number of controllable parameters that need to be adjusted in the remaining adjustment schemes can be quantified according to the following formula: score = 100% - difference in the number of controllable parameters * coefficient. The coefficient can be set according to the actual situation.

[0095] For the adjustment amount of the controllable parameter to be adjusted, the total adjustment amount required in each adjustment scheme can be counted first, that is, the sum of the adjustment amount of each controllable parameter. Then, the adjustment amount of the controllable parameter to be adjusted in each adjustment scheme can be quantified according to the quantification method of the number of controllable parameters.

[0096] Similarly, the time required to adjust the operating parameters that do not conform to the normal parameter range to the normal parameter range can also be quantified in the above manner.

[0097] Step S500: selecting an adjustment plan with the lowest comprehensive cost as the final plan.

[0098] Step S600: adjusting the controllable parameters involved according to the final solution.

[0099] In the second aspect, the present application provides a sewage treatment method based on MABR and carbon capture, comprising: Connecting the sewage to be purified to the MABR reactor (1) to output a first treated gas and a first treated water body; Inputting a first treated gas and a first treated water body into an algae pond (3) to output a second exhaust gas and a second treated water body, wherein the second exhaust gas is used for discharge; The second treated water body is input into the aquatic plant pond (4) to obtain the third discharged water body.

[0100] By adopting the above technical solution, the MABR reactor can use MABR technology to purify sewage. The purified sewage flows into the algae pool. The carbon dioxide and other waste gases generated in this process are also passed into the algae pool, so that the algae in the algae pool can absorb carbon dioxide and other waste gases for growth. At the same time, it can also purify the sewage. The purified sewage will also flow into the aquatic plant pool through the algae pool. The aquatic plants use their self-purification function to purify the sewage for a second time and discharge it. After being treated by the treatment device, carbon emissions are reduced, the utilization rate of treated sewage is improved, and the discharged sewage can meet the emission standards after purification in multiple links, so that small and medium-sized sewage treatment plants can be more green and environmentally friendly when treating sewage.

[0101] Optionally, also include: The first treated water body is input into the sedimentation tank (2) to output a fourth output water body and a fourth discharge water body, wherein the fourth output water body is used to input into the algae pond (3) and the fourth discharge water body is used for discharge.

[0102] Optionally, also include: After the first treated water body is input into the sedimentation tank (2), the sedimentation tank (2) also outputs fourth return sludge, and the fourth return sludge is used to be input into the MABR reactor (1).

[0103] Optionally, the MABR reactor (1) is a closed structure, and activated sludge is inoculated in the MABR reactor (1), the concentration of the activated sludge is 6~10 mg / L, the hydraulic retention time is 8~10 h, the dissolved oxygen content in the pool is 0.6~1.2 mg / L, the air supply pressure at the air inlet of the MABR reactor (1) is 0~60 KPa, and the speed of the agitator in the MABR reactor (1) is 100~150 rpm.

[0104] Optionally, the working speed of the sedimentation tank (2) is 0.2-0.3 m / h.

[0105] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described method can refer to the corresponding process in the aforementioned system embodiment, and will not be repeated here.

[0106] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. A wastewater treatment method based on MABR and carbon capture, characterized in that: include: Connecting the sewage to be purified to the MABR reactor (1) to output a first treated gas and a first treated water body; Inputting a first treated gas and a first treated water body into an algae pond (3) to output a second exhaust gas and a second treated water body, wherein the second exhaust gas is used for discharge; The second treated water body is input into the aquatic plant pond (4) to obtain the third discharged water body.

2. A sewage treatment method based on MABR and carbon capture according to claim 1, characterized in that: Also includes: The first treated water body is input into the sedimentation tank (2) to output a fourth output water body and a fourth discharge water body, wherein the fourth output water body is used to input into the algae pond (3) and the fourth discharge water body is used for discharge.

3. A sewage treatment method based on MABR and carbon capture according to claim 2, characterized in that: Also includes: After the first treated water body is input into the sedimentation tank (2), the sedimentation tank (2) also outputs fourth return sludge, and the fourth return sludge is used to be input into the MABR reactor (1).

4. A sewage treatment method based on MABR and carbon capture according to claim 3, characterized in that: The MABR reactor (1) is a closed structure. The MABR reactor (1) is inoculated with activated sludge. The concentration of the activated sludge is 6-10 mg / L, the hydraulic retention time is 8-10 h, the dissolved oxygen content in the pool is 0.6-1.2 mg / L, the air supply pressure at the air inlet of the MABR reactor (1) is 0-60 KPa, and the speed of the stirrer in the MABR reactor (1) is 100-150 rpm.

5. A sewage treatment method based on MABR and carbon capture according to claim 4, characterized in that: The working speed of the sedimentation tank (2) is 0.2-0.3 m / h.

6. A wastewater treatment system based on MABR and carbon capture, characterized by: It includes a MABR reactor (1), an algae pool (3) and an aquatic plant pool (4); The MABR reactor (1) is used to purify the introduced sewage using the MABR technology; The algae pool (3) is connected to the exhaust port of the MABR reactor (1) and the drain port of the MABR reactor (1) respectively, and is used to cultivate algae using exhaust gas and treated sewage, purify sewage, and release oxygen; The aquatic plant pool (4) is connected to the drain outlet of the algae pool (3) and is used to cultivate aquatic plants. The aquatic plants are used to absorb harmful substances in the sewage flowing out of the algae pool (3), and the treated sewage flows out through the drain outlet of the aquatic plant pool (4).

7. A sewage treatment system based on MABR and carbon capture according to claim 6, characterized in that: Also included is a sedimentation tank (2); The water inlet of the sedimentation tank (2) is connected to the drain outlet of the MABR reactor (1), and the drain outlet of the sedimentation tank (2) is connected to the water inlet of the algae pond (3). The sedimentation tank (2) is used to separate sewage and sludge, and the treated sewage flows out through the drain outlet of the sedimentation tank (2).

8. A sewage treatment system based on MABR and carbon capture according to claim 7, characterized in that: The sedimentation tank (2) is provided with a mud discharge port, and the mud discharge port of the sedimentation tank (2) is connected to the mud inlet of the MABR reactor (1) and is connected to the outside.

9. A sewage treatment system based on MABR and carbon capture according to claim 7, characterized in that: The MABR reactor (1) is a closed structure. The MABR reactor (1) is inoculated with activated sludge. The concentration of the activated sludge is 6-10 mg / L, the hydraulic retention time is 8-10 h, the dissolved oxygen content in the pool is 0.6-1.2 mg / L, the air supply pressure at the air inlet of the MABR reactor (1) is 0-60 KPa, and the speed of the stirrer in the MABR reactor (1) is 100-150 rpm.

10. A sewage treatment system based on MABR and carbon capture according to claim 7, characterized in that: The working speed of the sedimentation tank (2) is 0.2-0.3 m / h.

11. A sewage treatment system based on MABR and carbon capture according to claim 10, characterized in that: The sedimentation tank (2) is a vertical flow sedimentation tank (2) or a horizontal flow sedimentation tank (2) or a co-pipe sedimentation tank (2).

12. A sewage treatment system based on MABR and carbon capture according to claim 6, characterized in that: The algae pond (3) comprises a water storage tank (31) and an air chamber (32); A plant growth lamp (33) is arranged in the water storage tank (31), the water storage tank (31) is used to store water for algae growth, and a filter screen (34) is arranged at the drainage outlet of the water storage tank (31); The air chamber (32) is located above the water storage tank (31), the air inlet of the air chamber (32) is connected to the exhaust port of the MABR reactor (1), and the exhaust port of the air chamber (32) is connected to the outside.

13. A sewage treatment system based on MABR and carbon capture according to any one of claims 6 to 12, characterized in that: The system is also equipped with a control module, which is configured to: Acquiring real-time operating parameters, wherein the operating parameters are parameters that affect carbon emissions, mud emissions, and pollutant content in sewage in the sewage treatment system based on MABR and carbon capture; When one of the operating parameters does not meet the corresponding normal parameter range, Retrieving a parameter change model, wherein the parameter change model includes each operating parameter that changes when each controllable parameter is adjusted by different amounts, and the duration for the operating parameter to reach a stable state, wherein the controllable parameter is a parameter that has an influence on the operating parameter and is controllable; Based on the parameter change model, determining a plurality of adjustment schemes according to the operating parameters that do not conform to the normal parameter range; Determine the comprehensive cost of each of the said adjustment options; Selecting the adjustment plan with the lowest comprehensive cost as the final plan; The controllable parameters involved are adjusted according to the final solution.

14. A sewage treatment system based on MABR and carbon capture according to claim 13, characterized in that: Determining a plurality of adjustment schemes based on the parameter change model and according to the operating parameters that do not conform to the normal parameter range includes: Determine all controllable parameters in the parameter variation model that affect the operating parameters that do not conform to the normal parameter range, and record them as target controllable parameters; Determine, according to the parameter variation model, the target controllable parameter so that the first variable required when the operating parameter that does not meet the normal parameter range reaches the normal parameter range; Determine, according to the parameter change model, a second variable generated by the affected operating parameter after the target controllable parameter adjusts the first variable; Determine an operating parameter at which the second variable cannot maintain the corresponding operating parameter within a normal parameter range, and record the parameter as a target operating parameter; Based on the parameter change model, determining a newly added controllable parameter and a corresponding third variable according to the target operating parameter and the corresponding second variable; Determine an adjustment plan according to the target controllable parameter, the first variable, the newly added controllable parameter and the third variable; Each of the target controllable parameters is traversed to obtain multiple adjustment schemes.

15. A sewage treatment system based on MABR and carbon capture according to claim 14, characterized in that: The comprehensive cost of each adjustment plan is determined to include: Determining the number of controllable parameters that need to be adjusted according to the adjustment scheme, and the adjustment amount of each controllable parameter that needs to be adjusted; Determining the influence between the controllable parameters that need to be adjusted; Determining, according to the parameter change model, the time required to adjust the operating parameter that does not conform to the normal parameter range to the normal parameter range; The comprehensive cost is determined according to the number of controllable parameters that need to be adjusted, the adjustment amount of each controllable parameter that needs to be adjusted, the impact degree, and the time required to adjust the operating parameters that do not meet the normal parameter range to the normal parameter range.

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