Synchronous carbon sequestration and grey water purification device

Abstract

The invention discloses a synchronous carbon sequestration and grey water purification device, and belongs to the technical field of biological synergistic treatment of waste gas and grey water. The device comprises a purifier and a membrane wire assembly, the purifier comprises a barrel for inputting grey water, and an air inlet and an air outlet are formed in the upper end and the lower end of the barrel respectively; the membrane wire assembly comprises multiple strands of membrane wires and two fixing units, and the two ends of the multiple strands of membrane wires communicate with the air inlet and the air outlet through the fixing units correspondingly; the gas inlet can be used for inputting gas CO2 into the membrane filaments; microalgae for photosynthesis and bacteria for aerobic respiration are inoculated on the membrane filaments; the inoculum size of the microalgae is larger than that of the bacteria, and the microalgae can absorb gas CO2 which comes from an air inlet and is generated by breathing of the bacteria, fix the CO2 and generate oxygen. According to the invention, blowing oxygen supply for grey water is not needed, carbon dioxide is fixed, and emission of carbon dioxide gas is avoided.

Description

Technical Field

[0001] This invention relates to the field of biological co-treatment technology for waste gas and ash water, and particularly to a device for simultaneous carbon fixation and ash water purification. Background Technology

[0002] Currently, grey water accounts for 50%-80% of domestic sewage and typically contains organic matter, nitrogen, and high concentrations of surfactants from soaps, shampoos, toothpastes, and other skincare products. The main surfactant in grey water is linear alkylbenzene sulfonate (LAS), and direct discharge of high concentrations of LAS into the aquatic environment can adversely affect human health, wastewater biological treatment systems, and the ecological environment. Grey water treatment methods are mainly divided into physical, chemical, and biological methods. Physical and chemical methods, such as filtration, disinfection, and coagulation, usually incur high costs.

[0003] While traditional activated sludge processes can efficiently remove organic matter, nitrogen, and turbidity from greywater, traditional aerobic processes typically use blower aeration, which generates a large number of bubbles. This leads to the uncontrolled loss of a large number of microorganisms, thus affecting the system's treatment efficiency. Furthermore, the digestion and degradation of organic pollutants in greywater by aerobic bacteria produces a large amount of carbon dioxide, which cannot be effectively collected and fixed, thus conflicting with environmental protection principles. Summary of the Invention

[0004] In view of this, it is necessary to provide a device for simultaneous carbon fixation and greywater purification to solve the problem that existing greywater purification devices are prone to generating bubbles and emitting large amounts of carbon dioxide.

[0005] This invention provides a device for simultaneous carbon fixation and ash water purification, comprising: A purifier, comprising a cylinder for inputting grey water, wherein an air inlet and an air outlet are respectively provided at the upper and lower ends of the cylinder; The membrane filament assembly includes multiple membrane filaments and two fixing units. The two ends of the multiple membrane filaments are respectively connected to the air inlet and the air outlet through the fixing units. The air inlet can input CO2 gas into the membrane filaments. The membrane filaments are inoculated with microalgae for photosynthesis and bacteria for aerobic respiration. The inoculation amount of microalgae is greater than that of bacteria. The microalgae can absorb CO2 gas produced from the air inlet and bacterial respiration, fix CO2, and produce oxygen.

[0006] Furthermore, the microalgae is Synechocystis PCC 6803.

[0007] Furthermore, the microalgae and bacteria couple on the membrane filaments to form a symbiotic biofilm, which is uniformly attached to the surface of the membrane filaments.

[0008] Furthermore, the membrane filament is a hollow fiber membrane filament, with both ends of the membrane filament in an open state to allow gas to flow through, and the gas inside the membrane filament can diffuse outward through the hollow inner cavity.

[0009] Furthermore, the fixing unit includes a sleeve and a connecting tube. One end of the sleeve is clamped onto the multiple strands of the membrane filaments, and a sealing filler is filled between the sleeve and the membrane filaments. The other end of the sleeve is sealed to one end of the connecting tube, and the other end of the connecting tube is movably inserted into the air inlet or air outlet.

[0010] Furthermore, it also includes a liquid flow conveying assembly, which includes a water inlet located at the bottom of the cylinder, a water outlet located on the side wall of the cylinder, a water inlet pipe, and a water inlet pump. The two ends of the water inlet pipe are respectively connected to a water source for providing grey water and the water inlet. The water inlet pump is located on the water inlet pipe, and the water outlet is capable of outputting purified grey water.

[0011] Furthermore, the purifier also includes a reflux unit, which includes a reflux pump and a reflux pipe. The two ends of the reflux pipe are respectively connected to the lower part and the upper part of the cylinder. The reflux pump is installed on the cylinder and can drive the grey water deposited at the bottom of the cylinder to move to the upper layer of the cylinder.

[0012] Furthermore, the side wall of the cylinder is provided with a first return port and a second return port, and the two ends of the return pipe are respectively connected to the first return port and the second return port; the height of the first return port is higher than that of the second return port, and the height of the first return port is lower than that of the outlet.

[0013] Furthermore, it also includes an air intake assembly, which includes a gas source for providing CO2, an air intake pipe, a gas flow meter, and a pressure gauge. The two ends of the air intake pipe are respectively connected to the gas source and the air inlet to supply CO2 to the membrane fiber. The gas flow meter and the pressure gauge are disposed on the air intake pipe.

[0014] Furthermore, the top of the cylinder is provided with a cylinder cover, which is detachably connected to the cylinder; the cylinder cover is provided with a DO meter for measuring the oxygen content of the grey water and a pH meter for measuring the pH value of the grey water.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention discloses a simultaneous carbon fixation and greywater purification device, comprising a membrane fiber assembly. The assembly includes multiple membrane fibers and two fixing units. Both ends of the membrane fibers are connected to an air inlet and an air outlet via the fixing units, respectively. The air inlet allows CO2 gas to be introduced into the membrane fibers. CO2 enters from one end of the membrane fiber and exits from the other end through the air outlet. The membrane fibers can slowly supply CO2 to the greywater without generating bubbles that could cause microbial loss. Microalgae and bacteria are inoculated onto the membrane fibers, with the microalgae inoculation exceeding the bacterial inoculation. Bacterial respiration consumes organic pollutants and oxygen to produce CO2. The microalgae absorb carbon dioxide from the air inlet and bacterial respiration through photosynthesis, generating excess oxygen for bacterial respiration and fixing carbon elements to prevent CO2 emissions. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the purifier and the membrane fiber assembly in this invention; Figure 3 This is a schematic diagram of the air purifier in this invention; Figure 4 This is a schematic diagram of the membrane fiber assembly in this invention.

[0017] In the diagram, 100 is the air purifier; 110 is the cylinder; 111 is the air inlet; 112 is the air outlet; 120 is the reflux unit; 121 is the reflux pump; 122 is the reflux pipe; 123 is the first reflux port; 124 is the second reflux port; and 130 is the cylinder cover. 200. Membrane fiber assembly; 210. Membrane fiber; 220. Fixing unit; 221. Sleeve; 222. Connecting tube; 300. Liquid conveying assembly; 310. Inlet; 320. Outlet; 330. Inlet pipe; 340. Inlet pump; 400. Intake assembly; 410. Air source; 420. Intake pipe; 430. Gas flow meter; 440. Pressure gauge. Detailed Implementation

[0018] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0019] This embodiment presents a simultaneous carbon fixation and ash water purification device, relating to the field of biological co-treatment technology for waste gas and ash water. By installing membrane filaments 210 in the ash water purifier 100 and inoculating the filaments with bacteria and algae, the microalgae provide oxygen to the bacteria, allowing them to perform aerobic respiration and degrade organic matter. This eliminates the need for aeration of the ash water and avoids the generation of bubbles that could cause microbial loss. Simultaneously, carbon dioxide is supplied to the membrane filaments 210, enabling the microalgae to fix exogenous carbon dioxide and carbon dioxide produced by microbial respiration, thus preventing carbon dioxide emissions.

[0020] Please see Figures 1 to 4 This embodiment of a simultaneous carbon fixation and greywater purification device includes a purifier 100 and a membrane fiber assembly 200. The purifier 100 can serve as a container, providing a stable environment for greywater purification. The membrane fiber assembly 200 can provide attachment points for bacteria and algae, and can also provide gaseous carbon dioxide for the growth and reproduction of microalgae, thereby fixing carbon dioxide.

[0021] The purifier 100 includes a cylindrical body 110, with an air inlet 111 and an air outlet 112 at the upper and lower ends of the cylindrical body 110, respectively. The cylindrical body 110 is a container for holding the greywater treatment medium. A gas flow channel is formed between the air inlet 111 and the air outlet 112 to replenish the gas raw materials in the container.

[0022] The membrane fiber assembly 200 includes multiple membrane fibers 210 and two fixing units 220. The two ends of the multiple membrane fibers 210 are connected to an air inlet 111 and an air outlet 112 via the fixing units 220, respectively. The air inlet 111 allows CO2 gas to be introduced into the membrane fibers 210. The CO2 gas enters from one end of the membrane fiber 210 and exits from the other end through the air outlet 112. The membrane fibers 210 can slowly supply CO2 gas to the grey water without generating bubbles that would cause microbial loss. Microalgae and bacteria are inoculated on the membrane fibers 210, with the inoculation amount of microalgae exceeding that of bacteria. Bacterial respiration consumes organic pollutants and oxygen to produce CO2. The microalgae absorb carbon dioxide from the air inlet 111 and bacterial respiration through photosynthesis, producing excess oxygen for bacterial respiration and fixing carbon elements to prevent CO2 emissions.

[0023] During operation, after the greywater enters the cylinder 110, carbon dioxide gas is introduced into the internal cavity of the membrane filaments 210 through the air inlet 111, and diffuses outward into the liquid environment through the membrane wall. Microalgae attached to the surface of the membrane filaments 210 utilize the permeated carbon dioxide for photosynthesis, fixing carbon and releasing oxygen. The oxygen dissolves in the water, providing metabolic conditions for aerobic bacteria. When bacteria decompose organic matter in the greywater, they produce carbon dioxide, which is then absorbed and utilized by neighboring microalgae, forming a nutrient cycle, fixing carbon dioxide, and preventing CO2 emissions. Simultaneously, the gas flow promotes the distribution of dissolved oxygen, reducing the scouring effect of bubbles generated by traditional aeration on the biofilm.

[0024] In some embodiments, the microalgae is Synechocystis PCC 6803, which is more tolerant to sodium linear alkylbenzene sulfonate. Its cell wall structure can reduce the interference of surfactants on metabolic activities, and its carbon fixation rate is about 1.5 times higher than that of conventional Chlorella. Under the same treatment conditions, it can reduce the amount of carbon dioxide escape.

[0025] Synechocystis sp. PCC 6803 is a widely studied model cyanobacterium (blue-green algae) due to its known genome and ease of gene manipulation, often used in research on photosynthesis, carbon metabolism, bioenergy, and environmental remediation. PCC 6803 is a Gram-negative photosynthetic prokaryote (cyanobacterial), unicellular, but can form irregular aggregates. PCC 6803 cells are spherical to elliptical, approximately 1.5–2.5 μm in diameter, without flagella, although some strains possess ciliated structures. PCC 6803 has a well-developed thylakoid membrane, enabling photosynthetic oxygen release and CO2 fixation (Calvin cycle).

[0026] During greywater treatment, carbon dioxide-containing gas is introduced into the membrane filaments 210. Algal cells convert carbon dioxide into organic matter and release oxygen through photosynthesis. The oxygen is then used by bacteria to degrade organic pollutants in the greywater. The high photosynthetic efficiency of Synechocystis 6803 enables it to maintain stable carbon fixation capacity even under low light intensity or intermittent light conditions, thus ensuring continuous carbon dioxide fixation during greywater purification.

[0027] In some embodiments, microalgae and bacteria couple on the membrane filaments 210 to form a symbiotic biofilm, which is uniformly attached to the surface of the membrane filaments 210. By constructing the symbiotic biofilm, microorganisms are fixed to the surface of the membrane filaments 210, forming a stable attached community. This not only reduces the loss of microorganisms but also achieves carbon fixation through the synergistic effect of microalgae and bacteria, avoiding direct carbon dioxide emissions.

[0028] By adjusting the inoculation ratio and culture conditions of microalgae and bacteria, a stable composite structure is formed through metabolic complementarity between the two organisms. Microalgae produce oxygen through photosynthesis to supply the bacteria, while bacteria release carbon dioxide by decomposing organic matter to supply the microalgae, thus establishing a nutrient cycle. During the formation of a symbiotic biofilm on the surface of membrane filament 210, microalgae preferentially colonize the surface of membrane filament 210 to form a basal layer. Subsequently, bacteria embed and grow within the extracellular polymers secreted by the microalgae, forming a stable three-dimensional network structure.

[0029] As greywater flows through membrane filaments 210, the symbiotic biofilm fixes carbon dioxide through the photosynthesis of microalgae, while bacteria decompose organic matter and surfactants in the greywater. The carbon dioxide produced by metabolism is further absorbed by the microalgae. Due to the uniform attachment of the biofilm and the even distribution of active sites on the surface of membrane filaments 210, pollutants in the greywater can be efficiently degraded, and the biofilm structure is more stable, preventing the loss of microorganisms due to water flow.

[0030] In some embodiments, the membrane filament 210 is a hollow fiber membrane filament 210 with both ends open, allowing CO2 gas to enter and flow freely within it. Gas within the membrane filament 210 can diffuse outwards through the hollow interior. The membrane filament 210 enables stable gas transport without mechanical aeration, reducing the loss of microorganisms due to bubble disturbance. The directional flow and diffusion of gas within the hollow fiber membrane filament 210 synergistically enhance carbon fixation efficiency and maintain the stability of the symbiotic biofilm.

[0031] Hollow fiber membrane filament 210 is made of polypropylene, polyvinylidene fluoride or polyethersulfone. Its internal cavity forms a gas transmission channel. Gas permeates from the internal cavity of membrane filament 210 to the external environment through the micropores of the membrane wall. This can be achieved by adjusting the wall thickness, pore size and hydrophobicity of membrane filament 210. The permeation process can be completed without external mechanical aeration.

[0032] When gas flows through the hollow fiber membrane 210, both ends of the 210 remain open, allowing gas to enter the internal cavity of the 210 through the inlet 111 and flow axially. Some gas molecules diffuse outward through the micropores of the membrane wall to the surface of the 210, contacting the microalgae and bacteria attached to it. The microalgae absorb the carbon dioxide diffused to the surface of the 210 through photosynthesis, while the bacteria utilize oxygen for aerobic respiration to metabolize organic matter in the grey water. This gas diffusion process is driven by a concentration gradient, avoiding the violent bubble disturbances produced by traditional blower aeration.

[0033] In some embodiments, please refer to Figure 4 The fixing unit 220 includes a sleeve 221 and a connecting pipe 222. One end of the sleeve 221 is clamped onto the multi-strand membrane fibers 210. A sealing filler is filled between the sleeve 221 and the membrane fibers 210. The combination of the sleeve 221 and the sealing filler ensures that CO2 gas is stably input into the membrane fibers 210. The sealing filler effectively isolates the gas leakage path and improves gas utilization. The other end of the sleeve 221 is sealed to one end of the connecting pipe 222. The other end of the connecting pipe 222 is movably inserted into the air inlet 111 or the air outlet 112. The movable insertion structure reduces maintenance difficulty and extends the service life of the membrane fiber assembly 200.

[0034] In practical implementation, the sleeve 221 is made of metal or polymer material, and it provides physical constraint by clamping the membrane fiber 210, preventing displacement of the membrane fiber 210 during gas delivery. The sealing filler is made of silicone or epoxy resin, and it fills the gap between the sleeve 221 and the membrane fiber 210, preventing gas leakage and ensuring that CO2 gas flows only through the interior of the membrane fiber 210. The other end of the sleeve 221 is integrally cast or injection molded with one end of the connecting pipe 222, achieving a sealed connection. The connecting pipe 222 is detachably connected to the inlet 111 or outlet 112, specifically using a flange or snap-fit ​​structure, allowing for quick disassembly and replacement of the membrane fiber assembly 200.

[0035] During operation, the sleeve 221 forms a stable connection by clamping the membrane fiber 210 bundle. A sealing layer is formed between the inner wall of the sleeve 221 and the membrane fiber 210, blocking the gas leakage path. One end of the connecting pipe 222 is sealed to the sleeve 221, and the other end is connected to the inlet 111 or outlet 112 via a movable plug-in connection. Gas enters the hollow channel inside the membrane fiber 210 through the connecting pipe 222. When maintenance is required, the connecting pipe 222 can be pulled out from the inlet 111 or outlet 112 for easy cleaning or replacement of the membrane fiber assembly 200.

[0036] In some embodiments, please refer to Figure 2 A simultaneous carbon fixation and ash water purification device further includes a liquid flow conveying assembly 300. The liquid flow conveying assembly 300 includes an inlet 310 located at the bottom of a cylindrical body 110, an outlet 320 located on the side wall of the cylindrical body 110, an inlet pipe 330, and an inlet pump 340. The two ends of the inlet pipe 330 are respectively connected to a water source for providing ash water and the inlet 310. The inlet pump 340 is mounted on the inlet pipe 330. The processing load can be flexibly controlled by adjusting the parameters of the inlet pump 340 to adapt to the treatment needs of ash water of different concentrations. The closed-loop pipeline design of the liquid flow conveying assembly 300 also reduces the risk of secondary pollution and ensures a stable and reliable purification process.

[0037] In practical implementation, the inlet 310 is a channel located at the bottom of the cylinder 110 for introducing grey water. It can be implemented using an interface with a filter screen, which intercepts large particles to prevent clogging of the membrane fiber assembly 200. The outlet 320 is a channel located on the side wall of the cylinder 110 for discharging purified grey water. It can be implemented using a pipe with a regulating valve, which controls the water flow rate to match the treatment efficiency. The inlet pipe 330 is the conveying pipe connecting the water source and the inlet 310. It can be implemented using corrosion-resistant polyethylene pipe to ensure no leakage or contamination during grey water transportation. The inlet pump 340 is the power device that drives the grey water from the water source to the inlet 310. It can be implemented using a centrifugal pump or a peristaltic pump, and the grey water input rate is controlled by adjusting the pump speed.

[0038] During operation, greywater is pumped from a water source via inlet pump 340 and inlet pipe 330 to inlet 310 at the bottom of cylinder 110, where it is evenly introduced into the cylinder 110. As the greywater flows upward within the cylinder 110, it comes into contact with the symbiotic biofilm attached to the surface of the membrane fiber assembly 200, where organic matter and pollutants are degraded by microorganisms. The purified greywater is discharged through outlet 320 on the side wall, forming a continuous water circulation. Liquid flow delivery assembly 300 controls the inlet rate and outlet flow rate to maintain the residence time of the greywater within the cylinder 110, ensuring sufficient degradation of pollutants. Compared to existing technologies, traditional greywater treatment relies on aeration devices to drive water circulation, leading to microbial loss and increased energy consumption.

[0039] In some embodiments, the purifier 100 further includes a reflux unit 120, which includes a reflux pump 121 and a reflux pipe 122. The two ends of the reflux pipe 122 are respectively connected to the lower part and the upper part of the cylinder 110. The reflux pump 121 is disposed on the cylinder 110. By establishing an internal circulation system, the material located in the lower layer of the ash water is transported to the upper layer of the ash water, so that the pollutants that are not completely treated participate in the biodegradation process again. This reduces energy consumption and improves the stability of system operation, avoiding the defects of microbial loss and greenhouse gas emissions in traditional aeration processes.

[0040] In practical implementation, the reflux pump 121 is a mechanical device that provides fluid power, and can be implemented using a corrosion-resistant submersible pump. Its function is to provide lifting power for the grey water deposited at the bottom layer. The reflux pipe 122 refers to the guide channel connecting cavities at different heights, and can be implemented using UPVC pipes with flange joints. It is used to transport the grey water at the bottom layer to the upper area of ​​the device to participate in the purification process again.

[0041] When the greywater forms a sediment layer at the bottom of the cylinder 110 due to gravity, the return pump 121 is activated and extracts the sedimented greywater, lifting it to the upper part of the cylinder 110 through the return pipe 122. During the circulation process, the greywater continuously contacts the symbiotic biofilm on the surface of the membrane fibers 210, allowing incompletely degraded organic matter and suspended solids to participate in the microbial metabolic process again. This circulation mechanism effectively avoids the problem of decreased treatment efficiency caused by sediment accumulation in traditional treatment processes, while also reducing the loss of microorganisms caused by frequent sludge discharge.

[0042] In some embodiments, please refer to Figure 1 A simultaneous carbon fixation and greywater purification device further includes an air intake assembly 400. The air intake assembly 400 includes a gas source 410 for providing CO2, an air intake pipe 420, a gas flow meter 430, and a pressure gauge 440. The two ends of the air intake pipe 420 are connected to the gas source 410 and the air inlet 111, respectively. The CO2 collected in the gas source 410 can be utilized by microalgae and thus fixed, preventing direct carbon dioxide emissions. The gas flow meter 430 and pressure gauge 440 are installed on the air intake pipe 420. The gas flow meter 430 and pressure gauge 440 can dynamically monitor and regulate the carbon dioxide transport process in a closed loop, avoiding resource waste caused by excessive gas input while ensuring the gas requirements of the microalgae and bacteria symbiotic system within the membrane filaments 210.

[0043] In a specific embodiment, the gas source 410 is a device for storing or generating carbon dioxide, which can be implemented using a high-pressure gas cylinder or a carbon dioxide generator, to continuously supply the gas required for the reaction in the system. The gas flow meter 430 is a device for monitoring and regulating the gas delivery rate, which can be implemented using a rotor flow meter or a mass flow controller, controlling the carbon dioxide input rate through real-time feedback data. The pressure gauge 440 is a device for detecting the gas delivery pressure, which can be implemented using a mechanical pressure gauge or an electronic sensor, ensuring the stability of gas delivery by monitoring pressure changes within the pipeline.

[0044] During operation, the gas source 410 is connected to the air inlet 111 of the purifier 100 via the air inlet pipe 420. A gas flow meter 430 and a pressure gauge 440 are integrated into the air inlet pipe 420. After carbon dioxide gas is output from the gas source 410, it flows through the gas flow meter 430 to quantify its volumetric flow rate, while the pressure gauge 440 detects the pressure within the pipe. The data from the gas flow meter 430 can be used to adjust the opening of the gas source 410's output valve; for example, it can automatically increase the valve opening when the flow rate is below a set threshold. The pressure gauge 440 is used to prevent damage to the membrane fiber 210 structure due to excessive pressure or a decrease in gas diffusion efficiency due to insufficient pressure during gas delivery.

[0045] In some embodiments, please refer to Figure 3The top of the cylinder 110 is equipped with a cylinder cover 130, which is detachably connected to the cylinder 110, ensuring airtightness while facilitating opening for equipment maintenance. The cylinder cover 130 is equipped with a DO meter for measuring the oxygen content of the greywater and a pH meter for measuring the pH value of the greywater. Using the DO meter and pH meter, dissolved oxygen and pH values ​​can be monitored online, allowing for timely adjustment of operating conditions to maintain microbial activity, thereby improving greywater purification efficiency and ensuring the stability of the CO2 fixation process.

[0046] In practical implementation, the cylinder cover 130 can adopt a flange connection or a snap-fit ​​structure. The cylinder cover 130 covers the top of the cylinder 110 to seal the cylinder 110 and facilitate disassembly and maintenance. The DO meter is a dissolved oxygen detection instrument, which can be implemented using an electrochemical sensor or a fluorescence sensor, to monitor the dissolved oxygen concentration in the greywater in real time to assess microbial metabolic activity. The pH meter is an acidity / alkalinity detection instrument, which can be implemented using a glass electrode or a solid-state electrode sensor, to monitor changes in the acidity / alkalinity of the greywater in real time to determine the stability of the reaction environment.

[0047] During operation, the cylinder cover 130 is connected to the cylinder body 110 via a detachable structure, ensuring airtightness while facilitating easy opening for equipment maintenance. The DO meter and pH meter integrated on the cylinder cover 130 are directly immersed in the greywater, acquiring real-time dissolved oxygen concentration and pH data via sensors. Dissolved oxygen data can be used to determine the oxygen production efficiency of microalgae photosynthesis and the aerobic respiration status of bacteria, while pH data reflects the progress of CO2 fixation and organic matter degradation in the greywater. By continuously monitoring these two parameters, the CO2 intake rate or greywater circulation rate can be dynamically adjusted, thereby optimizing carbon fixation and purification efficiency.

[0048] The following is a specific experimental example of this application: The greywater used was simulated wastewater containing a high proportion of surfactants, with a flow rate of 2.3 L / d. The influent TCOD was 511 ± 13 mg / L, LAS was 335 ± 13 mg COD / L, TN was 13.5 ± 0.6 mg / L, and pH was 7.02 ± 0.03. This example used CO2-containing waste gas with a CO2 to N2 volume ratio of 1:1, and the purification system's gas supply pressure was 0.56 ± 0.08 psi. Under this pressure, a stable algal biofilm (MLSS = 2.2 g / L) could form in approximately 20 days. During the acclimatization period, aerobic activated sludge from a municipal wastewater treatment plant was inoculated at a rate of approximately 1.5 mL / L (MLSS = 2.5 g / L). The microalgae inoculation rate was 20 mL (MLSS = 1.6 g / L). After sludge and microalgae were inoculated into the reactor, the wastewater containing the inoculated sludge and microalgae was circulated in the reactor for 2 days using magnetic stirring to form a preliminary biofilm on the surface of the membrane filaments 210. Then, the magnetic stirrer was discontinued, and the reactor entered a continuous flow operation phase, maintaining a hydraulic retention time of 7.5 h. During 60 days of continuous operation, the system pH value remained stable at 7.2 ± 0.3, and the removal rates of COD, LAS, and TN in the greywater were 92.4%, 99.6%, and 90.8%, respectively, meeting the Class I discharge standard for domestic sewage.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of the present invention.

Claims

1. A device for simultaneous carbon capture and grey water purification, characterized in that, The application relates to a grey water purifier. The purifier comprises a cylinder for inputting grey water, and an air inlet and an air outlet arranged at the upper and lower ends of the cylinder respectively. The membrane filament assembly comprises a plurality of membrane filaments and two fixing units, and the two ends of the plurality of membrane filaments are communicated with the air inlet and the air outlet through the fixing units respectively.

2. A device for simultaneous carbon capture and grey water purification according to claim 1, characterized in that, The air inlet can input gas CO2 into the membrane filaments.

3. The apparatus of claim 1, wherein, The membrane filaments are inoculated with microalgae for photosynthesis and bacteria for aerobic respiration.

4. The apparatus of claim 1, wherein, The inoculation amount of the microalgae is greater than that of the bacteria.

5. The apparatus of claim 1, wherein, The microalgae can absorb gas CO2 from the air inlet and the bacteria respiration, fix CO2 and generate oxygen.

6. The apparatus of claim 1, wherein, The microalgae is Synechococcus sp. PCC 6803.

7. A device for simultaneous carbon capture and grey water purification according to claim 6, wherein, The microalgae and the bacteria are coupled to form a symbiotic biofilm on the membrane filaments, and the symbiotic biofilm is uniformly attached to the surface of the membrane filaments.

8. A device for simultaneous carbon capture and grey water purification according to claim 7, characterized in that, The membrane filaments are hollow fiber membrane filaments, and the two ends of the membrane filaments are in an open state for gas flow.

9. The apparatus of claim 1, wherein, The gas in the membrane filaments can diffuse outward through the hollow cavity.

10. The apparatus of claim 1, wherein, The fixing unit comprises a sleeve and a connecting pipe. One end of the sleeve is clamped on the plurality of membrane filaments, and a sealing filler is filled between the sleeve and the membrane filaments. The other end of the sleeve is sealingly connected with one end of the connecting pipe, and the other end of the connecting pipe is movably inserted into the air inlet or the air outlet. The liquid flow conveying assembly comprises a water inlet arranged at the bottom of the cylinder, a water outlet arranged on the side wall of the cylinder, a water inlet pipe and a water inlet pump. The two ends of the water inlet pipe are respectively communicated with a water source for providing grey water and the water inlet. The water inlet pump is arranged on the water inlet pipe. The water outlet can output the purified grey water. The purifier further comprises a backflow unit. The backflow unit comprises a backflow pump and a backflow pipe. The two ends of the backflow pipe are respectively communicated with the lower part and the upper part of the cylinder. The backflow pump is arranged on the cylinder. The backflow pump can drive the grey water deposited in the bottom layer of the cylinder to move to the upper layer of the cylinder. The side wall of the cylinder is provided with a first backflow opening and a second backflow opening. The two ends of the backflow pipe are respectively communicated with the first backflow opening and the second backflow opening. The height of the first backflow opening is higher than that of the second backflow opening. The height of the first backflow opening is lower than that of the water outlet. The air inlet assembly comprises a gas source for providing CO2, an air inlet pipe, a gas flow meter and a pressure gauge. The two ends of the air inlet pipe are respectively communicated with the gas source and the air inlet for supplying CO2 into the membrane filaments. The gas flow meter and the pressure gauge are arranged on the air inlet pipe. The top of the cylinder is provided with a cylinder cover. The cylinder cover is detachably connected with the cylinder. The cylinder cover is provided with a DO instrument for measuring the oxygen content of the grey water and a pH meter for measuring the pH value of the grey water.

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