Sewage treatment system based on MABR and carbon capture

Abstract

The utility model relates to a sewage treatment system based on MABR and carbon capture. The sewage treatment system comprises an MABR reactor, an algae pool and an aquatic plant pool, the MABR reactor is used for purifying introduced sewage by utilizing an MABR technology; the algae pool is respectively communicated with an exhaust port of the MABR and a water outlet of the MABR and is used for culturing algae by utilizing waste gas and treated sewage, purifying the sewage and releasing oxygen; the aquatic plant pond is communicated with the water outlet of the algae pond and is used for culturing aquatic plants, harmful substances in sewage flowing out of the algae pond are adsorbed by the aquatic plants, and the treated sewage flows out through the water outlet of the aquatic plant pond. According to the sewage treatment system, the carbon emission of the treated sewage is reduced, the utilization rate of the treated sewage is improved, and the discharged sewage can reach the emission standard after being purified in multiple 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 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, lower carbon emissions and achieve efficient use of resources.

[0003] Large-scale wastewater treatment plants typically use carbon capture and energy recovery technologies to treat wastewater. Carbon capture involves separating and capturing carbon dioxide from industrial or energy production sources for geological, chemical, or biological utilization, or transporting it to suitable storage sites to isolate it from the atmosphere for the long term. Energy recovery, based on the law of conservation of energy, captures and utilizes waste energy, converting it into useful energy.

[0004] Because carbon capture technology is suitable for wastewater treatment plants with high carbon emissions, and energy recovery technology is suitable for larger plants with high energy flows, resource-constrained small and medium-sized wastewater treatment plants face high investment and maintenance costs and poor returns when using these two technologies to treat wastewater. Consequently, small and medium-sized wastewater treatment plants currently lack an ecologically sustainable, low-carbon wastewater treatment method. Utility Model Content

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

[0006] The wastewater treatment system based on MABR and carbon capture provided in this application adopts the following technical solutions:

[0007] A wastewater treatment system based on MABR and carbon capture, comprising a MABR reactor, an algae pond and an aquatic plant pond;

[0008] The MABR reactor is used to purify the introduced sewage using MABR technology;

[0009] The algae pond is connected to the exhaust port of the MABR reactor and the drain port of the MABR reactor respectively, and is used to utilize the exhaust gas and the treated sewage to cultivate algae, purify the sewage, and release oxygen;

[0010] 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.

[0011] 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 introduced into the algae pool, allowing the algae in the algae pool to 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 through the algae pool into the aquatic plant pool. The aquatic plants use their self-purification function to purify the sewage for a second time and discharge it. After treatment by this 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, making small and medium-sized sewage treatment plants more green and environmentally friendly when treating sewage.

[0012] Optionally, a sedimentation tank is also included;

[0013] 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.

[0014] 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.

[0015] Optionally, an intermediate pool is also included;

[0016] The water inlet of the intermediate pool is connected to the drain outlet of the sedimentation pool, and the drain outlet of the intermediate pool is connected to the water inlet of the algae pool. The intermediate pool is used to temporarily store the supernatant of the sedimentation pool.

[0017] Optionally, the MABR reactor includes a biofilm culture component and a mixer, the mixer is arranged at the bottom of the MABR reactor, activated sludge is planted in the MABR reactor, and the biofilm culture component is arranged along the side wall of the MABR reactor to make the membrane filaments react with the introduced oxygen to generate an aerobic biofilm.

[0018] By adopting this technical solution, the biofilm cultivation module allows oxygen to feed the membrane fibers, thereby forming an aerobic biofilm that absorbs impurities in the sewage. When sewage is pumped into the MABR reactor, the activated sludge in the agitator is fully absorbed by the impurities, achieving water purification.

[0019] Optionally, the biofilm culture assembly includes an air inlet pipe, an air outlet pipe, a fixed rod and membrane filaments, the fixed rod is fixedly arranged along the side wall of the MABR reactor, the membrane filaments are wound around the fixed rod, one end of the membrane filaments is connected to the air inlet pipe, and the other end is connected to the air outlet pipe, and the air outlet pipe passes through the top cover of the MABR reactor to serve as the air outlet of the MABR reactor.

[0020] Optionally, the membrane filaments are provided in N groups, each group of the membrane filaments includes multiple membrane filaments, and the biofilm culture component also includes two gas separators, N air inlet branches and N exhaust branches. One end of an air separator is connected to the air inlet pipe, and the other end is respectively connected to the N air inlet branches. Each of the air inlet branches is connected to a group of membrane filaments, and the other end of each group of membrane filaments is connected to one of the exhaust branches. One end of another air separator is connected to the air outlet pipe, and the other end is respectively connected to the N exhaust branches.

[0021] By adopting the above technical solution, the membrane filaments are divided into N groups, each group having multiple membrane filaments, which can achieve a better effect in treating sewage.

[0022] Optionally, a pipe clamp is provided on the portion of the gas outlet pipe located outside the MABR reactor.

[0023] By adopting the above technical solution, the opening of the air outlet pipe can be adjusted according to the demand for dissolved oxygen.

[0024] Optionally, the algae pond includes a water storage tank and an air chamber;

[0025] A plant growth lamp is provided in the water reservoir, the water reservoir is used to store water for algae growth, and a filter is provided at the drain outlet of the water reservoir;

[0026] 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 world.

[0027] 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.

[0028] 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.

[0029] Optionally, the sedimentation tank is a vertical flow sedimentation tank, a horizontal flow sedimentation tank, or an inclined tube sedimentation tank.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 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 introduced into the algae pool, allowing the algae in the algae pool to 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 this 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, making small and medium-sized sewage treatment plants more green and environmentally friendly when treating sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 2 1 is a top view of the MABR reactor of an embodiment of the present application.

[0034] Figure 3 2 is a front view of the MABR reactor according to an embodiment of the present application.

[0035] Figure 4 This is a schematic diagram of the installation of the MABR membrane fibers according to an embodiment of the present application.

[0036] Explanation of the accompanying symbols: 1. MABR reactor; 11. Biofilm culture component; 111. Air inlet pipe; 112. Air outlet pipe; 113. Fixing rod; 114. Membrane filament; 115. Air separator; 116. Air inlet branch pipe; 117. Air outlet branch pipe; 12. Mixer; 2. Sedimentation tank; 3. Intermediate tank; 4. Algae tank; 41. Water storage tank; 42. Air chamber; 43. Plant growth lamp; 5. Aquatic plant tank. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-4 It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0038] The embodiments of the present application disclose a sewage treatment system based on MABR and carbon capture.

[0039] Reference Figure 1The MABR and carbon capture-based wastewater treatment system includes a MABR reactor 1, a sedimentation tank 2, an intermediate tank 3, an algae tank 4, and an aquatic plant tank 5. The MABR reactor 1, sedimentation tank 2, intermediate tank 3, algae tank 4, and aquatic plant tank 5 are connected by pipes to achieve wastewater treatment and purification. The carbon dioxide generated during wastewater treatment can also be absorbed by the algae cultivated in the algae tank 4, thereby ensuring that the carbon emissions and wastewater discharged by small and medium-sized wastewater treatment plants meet emission requirements.

[0040] Specifically, the MABR reactor 1 is used to purify the introduced sewage using the MABR technology.

[0041] MABR technology is a novel wastewater treatment technology that combines bubble-free oxygen supply, heterogeneous mass transfer, and a layered structure. MABR technology utilizes a microporous membrane or a breathable dense membrane for bubble-free oxygen supply. Oxygen and nutrients enter the biofilm from either side of the attached biofilm. Combined with mass transfer resistance, oxygen and nutrient concentration gradients develop within the biofilm, resulting in a stratified pattern of aerobic, anoxic, and anaerobic zones. This allows for simultaneous nitrification and denitrification within the biofilm, achieving single-stage denitrification and carbon removal. Taking nitrification and denitrification as an example, due to the distinct oxygen and substrate concentration gradients within the biofilm, the outermost layer has a low dissolved oxygen concentration and abundant organic carbon sources, making it ideal for denitrification. Conversely, the inner layer of the biofilm has a high dissolved oxygen concentration and a low organic carbon concentration, making it ideal for nitrification. Therefore, MABR is well-suited for simultaneous nitrification, denitrification, and nitrogen removal.

[0042] Generally, the MABR reactor 1 is a relatively closed reactor. The sewage to be treated is passed into the reaction tank, and the treated sewage and waste gas are output to the subsequent stage. The reaction tank is equipped with a MABR membrane assembly, which mainly consists 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 utilized 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 and anaerobic bacteria, promoting the removal of nitrogen 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.

[0043] In this application, the MABR reactor 1 is a closed structure with a water inlet, a drain outlet, an air inlet, an exhaust outlet, and a mud inlet. The water inlet is used to allow sewage to flow in. The drain outlet is used to allow treated sewage to flow out. The air inlet is used to allow oxygen or air to flow in. The exhaust outlet is used to discharge waste gases such as carbon dioxide generated during sewage purification. The mud inlet is used to allow sludge to enter.

[0044] 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.

[0045] refer to Figure 2 The MABR reactor 1 includes a biofilm culture assembly 11 and a mixer 12. The mixer 12 is located at the bottom of the MABR reactor 1. Because activated sludge is grown inside the MABR reactor 1, when sewage is pumped in through the water inlet, the sewage and activated sludge are fully mixed by the mixer 12, allowing the activated sludge to fully absorb impurities in the sewage, thereby achieving a water purification effect.

[0046] refer to Figure 2 、 Figure 3 and Figure 4 The biofilm culture component 11 is arranged along the side wall of the MABR reactor 1, and is used to make the membrane filaments 114 react with the oxygen introduced to generate an aerobic biofilm. The biofilm culture component 11 includes an air inlet pipe 111, an air outlet pipe 112, a fixing rod 113 and a membrane filament 114. Specifically, the fixing rod 113 is fixedly arranged on the side wall of the MABR reactor 1 in a direction perpendicular to the side wall of the MABR reactor 1. A plurality of fixing rods 113 are arranged on each side wall of the MABR reactor 1. The fixing rod 113 can be a strip-shaped fixing rod. The fixing rod 113 can be made of acrylic material. The membrane filament 114 is wound around the fixing rod 113. When the fixing rods 113 are arranged on the side walls of the MABR reactor 1, the membrane filaments 114 are also evenly distributed in the MABR reactor 1. One end of the membrane filament 114 is connected to the air inlet pipe 111, and the other end is connected to the air outlet pipe 112. The air inlet pipe 111 passes through the MABR reactor 1 and serves as the air inlet of the MABR reactor 1. The air outlet pipe 112 passes through the top cover of the MABR reactor 1 and serves as the air outlet of the MABR reactor 1.

[0047] It can be understood that the length of the membrane filaments 114 depends on the amount of oxygen required for the MABR reactor 1 to treat sewage. The method for calculating the length of the membrane filaments 114 is: first, you need to know the current sewage indicators and the sewage discharge indicators. The indicators can be the oxygen concentration and ammonia nitrogen content required for the chemical oxidation of organic matter in the wastewater. Then, it is necessary to determine the amount of oxygen required for sewage treatment based on the current sewage indicators and sewage discharge indicators. Finally, the total area of ​​the membrane filaments 114 required is determined based on the required oxygen amount and oxygen transfer rate. Among them, under standard conditions of 20°C, the amount of oxygen required to treat sewage is 0.7*Q*BOD 去 +0.16*X*V+4.57*Q*ammonia nitrogen removal. In the above formula, 0.7 is the amount of oxygen required to remove organic matter from 1kg of sewage, Q is the total amount of water treated per day, and BOD 去 is the total amount of organic matter in the sewage, 0.16 is the amount of oxygen required for 1kg of activated sludge to respire, X is the activated sludge concentration of MABR reactor 1, V is the volume of MABR reactor 1, and 4.57 is the oxygen required to remove 1kg of ammonia nitrogen. For example, the oxygen concentration required for the chemical oxidation of organic matter in the current sewage is 350mg / L, the ammonia nitrogen content in the current sewage is 43mg / L, and the sewage discharge index requires the oxygen concentration required for the chemical oxidation of organic matter in the sewage is 50mg / L, and the ammonia nitrogen content is 8mg / L. According to the above formula, the required amount of oxygen is 0.09kg / d. It is known that the oxygen transmission rate of membrane filament 114 is 0.4g / (㎡h)=9.6g / (㎡d), and the outer diameter of membrane filament 114 is 1.5mm, so the total area of ​​membrane filament 114 required is 90g / d÷9.6g / (㎡d)=9.4m 2 The length of membrane filament 114 is 9.4m 2 ÷(3.14*0.015)=200m. It should be noted that in actual use, the length of the membrane filament 114 should not be too long.

[0048] In a specific embodiment, in order to improve the purification effect, the membrane filaments 114 are arranged into N groups, and each group of membrane filaments 114 is composed of a plurality of membrane filaments 114. The biofilm culture component 11 also includes two gas separators 115, N air inlet branches 116 and N exhaust branches 117. When the MABR reactor 1 is a rectangular parallelepiped structure, four groups of membrane filaments 114 can be set. Correspondingly, the number of air inlet branches 116 is 4, and the number of exhaust branches 117 is also 4. Specifically, one end of an air separator 115 is connected to the air inlet pipe 111, and the other end is connected to four air inlet branches 116 respectively. Each air inlet branch 116 is connected to a group of membrane filaments 114, and the other end of each group of membrane filaments 114 is connected to an exhaust branch 117. One end of another air separator 115 is connected to the air outlet pipe 112, and the other end is connected to four exhaust branches 117 respectively. Each set of membrane filaments 114 is wound around a fixed rod 113 on a side wall of the MABR reactor 1. When sewage is pumped into the MABR reactor 1 and oxygen is delivered to the MABR reactor 1 using an oxygen generator or blower, the oxygen diffuses along the MABR membrane filaments 114 in the water, forming an aerobic biofilm on the surface of the MABR membrane. Oxygen and pollutants in the sewage are located on either side of the MABR biofilm and are transferred into and consumed by the MABR biofilm. During this process, the MABR biofilm absorbs pollutants from the sewage and converts them into energy and waste through metabolism. This process involves nitrification and denitrification, namely, the oxidation of ammonia nitrogen and the reduction of nitrogen gas. Furthermore, since activated sludge is composed of a microbial community and the organic and inorganic matter it adheres to, the microbial community is also aerobic. Therefore, under conditions of sufficient oxygen in the water, the microbial community can rapidly reproduce. The mucus secreted by the microbial community and the solid particles and colloids absorbed and accumulated by the microbial community can also absorb and oxidize organic matter in the sewage.

[0049] It is understandable that in the above-mentioned biochemical reaction process, the oxygen delivered by the oxygen generator or blower enters the MABR biofilm under the drive of the pressure difference, and the oxygen pressure is always maintained below the bubble point pressure of the MABR biofilm, which can ensure that the oxygen transmission is avoided while generating bubbles causing the waste gas containing aerosols and volatile organic compounds to be discharged to the outside world. At the same time, by controlling the operation of the stirrer 12, 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, and the effect of purifying sewage can be achieved. Since the MABR technology does not need to use compressed air for aeration, it can significantly reduce energy consumption. And because oxygen enters the MABR biofilm through a free diffusion mechanism, it is possible to improve the oxygen mass transfer efficiency and further reduce energy consumption.

[0050] To achieve the above effects, in the present embodiment, the MABR membrane is selected to be a permeable membrane, such as a selective permeable membrane, to prevent pollutants in the sewage from entering the MABR biofilm. Furthermore, the activated sludge concentration is controlled to be maintained at 6-10 mg / L, the hydraulic retention time is 8-10 hours, the air supply pressure is maintained at 0-60 kPa, the dissolved oxygen content is controlled at 0.6-1.2 mg / L, and the speed of the agitator 12 is maintained at 100-150 rpm.

[0051] In some specific embodiments, a pipe clamp is further provided on the portion of the gas outlet pipe 112 located outside the MABR reactor 1, and the opening of the pipe can be adjusted by controlling the pipe clamp.

[0052] Reference Figure 1 The water inlet of the sedimentation tank 2 is connected to the outlet of the MABR reactor 1 through a pipeline. The sedimentation tank 2 is used to separate sewage and activated sludge.

[0053] It is understood that although the wastewater discharged from the MABR reactor 1 is wastewater that has undergone biochemical reactions, it will contain a certain amount of activated sludge. If wastewater containing activated sludge is discharged to the outside world for a long time, it will also have a certain impact on the ecology. Therefore, it is necessary to separate the wastewater from the activated sludge in the sedimentation tank 2.

[0054] In some specific embodiments, the sedimentation tank 2 can be a vertical flow sedimentation tank, a horizontal flow sedimentation tank, or an inclined tube sedimentation tank. The operating speed of the sedimentation tank 2 needs to be controlled at 0.2 to 0.3 m / h. The sewage treated by the sedimentation tank 2 flows out from its drain port.

[0055] 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 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 set a one-way valve 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.

[0056] Intermediate tank 3 temporarily stores the supernatant from sedimentation tank 2. It has two drains and one inlet. The inlet connects to the drain of sedimentation tank 2, one drain connects to the inlet of algae pond 4, and the other drain connects to the outside world. A peristaltic pump is installed at the drain connecting to algae pond 4 to pump the supernatant into the pond.

[0057] The algae pool 4 is connected to the exhaust port of the MABR reactor 1 and is used to utilize waste gas such as carbon dioxide and treated sewage to cultivate algae, purify sewage, and release oxygen.

[0058] Specifically, the algae pond 4 consists of a water reservoir 41 and an air chamber 42. The water inlet of the water reservoir 41 is connected to the drain outlet of the intermediate pond 3 via a pipe. The water reservoir 41 stores water for algae growth. To provide a favorable living environment for the algae, a plant growth light 43 is installed within the water reservoir 41. To prevent algae from flowing out of the drain outlet of the water reservoir 41 along the direction of the water flow, a filter is also installed at the drain outlet of the water reservoir 41.

[0059] The air chamber 42 is located above the water storage tank 41, and the air inlet of the air chamber 42 is connected to the exhaust port of the MABR reactor 1 through a pipeline, and the exhaust port of the air chamber 42 is connected to the outside world.

[0060] As can be appreciated, algae, as a type of single-celled microorganism with extremely high photosynthetic efficiency, not only efficiently absorb carbon dioxide and release oxygen through photosynthesis, but also convert carbon dioxide into various bioactive components such as proteins, oils, and polysaccharides. In some specific embodiments, Spirulina can be selected as the primary algae for cultivation in algae pond 4. Furthermore, algae can utilize their self-purification capabilities to secondary purify treated wastewater.

[0061] In a specific embodiment, a plurality of algae ponds 4 may be provided. The air inlet of each algae pond 4 is connected to the exhaust port of the MABR reactor 1.

[0062] Aquatic plant pool 5 is connected to the drain outlet of algae pool 4 and is used to cultivate aquatic plants, which absorb harmful substances from the sewage flowing out of algae pool 4. Similarly, aquatic plant pool 5 is also equipped with plant growth lights 43. Because the aquatic plants cultivated in aquatic plant pool 5 also have self-purification functions, the sewage flowing into aquatic plant pool 5 from algae pool 4 is purified by the self-purification function of the aquatic plants, and the sewage discharged from the drain outlet of aquatic plant pool 5 can meet the discharge standards.

[0063] Of course, in some specific embodiments, it is also possible to choose not to set up the sedimentation tank 2 and the intermediate tank 3, and directly connect the water inlet of the algae pool 4 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.

[0064] The implementation principle of the sewage treatment system based on MABR and carbon capture in the embodiment of the present application is as follows: MABR reactor 1 can purify sewage using MABR technology, and the purified sewage flows into algae pool 4. Other waste gases such as carbon dioxide generated in this process are also introduced into algae pool 4, so that algae in algae pool 4 can absorb carbon dioxide and other waste gases for growth, and at the same time, it can also purify sewage. The purified sewage will also flow into aquatic plant pool 5 through algae pool 4. Aquatic plants perform secondary purification of sewage through self-purification function and discharge it. After being treated by this 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.

[0065] The above are all preferred embodiments of the present application and are not intended to limit the scope of protection of this application. Unless otherwise stated, any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is merely an example of a series of equivalent or similar features.

Claims

1. A wastewater treatment system based on MABR and carbon capture, characterized by: It includes a MABR reactor (1), an algae pond (4) and an aquatic plant pond (5); The MABR reactor (1) is used to purify the introduced sewage using MABR technology; The algae pond (4) 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 utilize the exhaust gas and the treated sewage to cultivate algae, purify the sewage, and release oxygen; The aquatic plant pool (5) is connected to the drain outlet of the algae pool (4) 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 (4), and the treated sewage flows out through the drain outlet of the aquatic plant pool (5).

2. The sewage treatment system based on MABR and carbon capture according to claim 1, 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 (4). 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).

3. The sewage treatment system based on MABR and carbon capture according to claim 2, characterized in that: Also included is an intermediate pool (3); The water inlet of the intermediate pool (3) is connected to the drain outlet of the sedimentation pool (2), and the drain outlet of the intermediate pool (3) is connected to the water inlet of the algae pool (4). The intermediate pool (3) is used to temporarily store the supernatant of the sedimentation pool (2).

4. The sewage treatment system based on MABR and carbon capture according to claim 3, characterized in that: The MABR reactor (1) includes a biofilm culture component (11) and a stirrer (12), wherein the stirrer (12) is arranged at the bottom of the MABR reactor (1), activated sludge is planted in the MABR reactor (1), and the biofilm culture component (11) is arranged along the side wall of the MABR reactor (1) to enable the membrane filaments (114) to react with the introduced oxygen to generate an aerobic biofilm.

5. The sewage treatment system based on MABR and carbon capture according to claim 4, characterized in that: The biofilm culture component (11) includes an air inlet pipe (111), an air outlet pipe (112), a fixing rod (113) and a membrane filament (114). The fixing rod (113) is fixedly arranged along the side wall of the MABR reactor (1). The membrane filament (114) is wound around the fixing rod (113). One end of the membrane filament (114) is connected to the air inlet pipe (111), and the other end is connected to the air outlet pipe (112). The air outlet pipe (112) passes through the top cover of the MABR reactor (1) and serves as the air outlet of the MABR reactor (1).

6. The wastewater treatment system based on MABR and carbon capture according to claim 5, characterized in that: The membrane filaments (114) are provided in N groups, and each group of the membrane filaments (114) includes multiple membrane filaments (114). The biofilm culture component (11) also includes two gas separators (115), N air inlet branches (116) and N air outlet branches (117). One end of an air separator (115) is connected to the air inlet pipe (111), and the other end is respectively connected to the N air inlet branches (116). Each of the air inlet branches (116) is connected to a group of membrane filaments (114). The other end of each group of membrane filaments (114) is connected to one of the air outlet branches (117). One end of another air separator (115) is connected to the air outlet pipe (112), and the other end is respectively connected to the N air outlet branches (117).

7. The sewage treatment system based on MABR and carbon capture according to claim 5, characterized in that: A pipe clamp is provided on the portion of the gas outlet pipe (112) located outside the MABR reactor (1).

8. The sewage treatment system based on MABR and carbon capture according to claim 3, characterized in that: The algae pond (4) comprises a water storage tank (41) and an air chamber (42); A plant growth lamp (43) is provided in the water reservoir (41), the water reservoir (41) is used to store water for algae growth, and a filter is provided at the drain outlet of the water reservoir (41); The air chamber (42) is located above the water storage tank (41), the air inlet of the air chamber (42) is connected to the exhaust port of the MABR reactor (1), and the exhaust port of the air chamber (42) is connected to the outside world.

9. The sewage treatment system based on MABR and carbon capture according to claim 3, 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 world.

10. The sewage treatment system based on MABR and carbon capture according to claim 3, characterized in that: The sedimentation tank (2) is a vertical flow sedimentation tank, a horizontal flow sedimentation tank, or an inclined tube sedimentation tank.

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