Dynamic membrane treatment device and method for simultaneous removal and resource utilization of carbon, nitrogen and phosphorus in sewage

Abstract

The present application relates to a kind of dynamic membrane processing device and method for simultaneous removal of carbon, nitrogen and phosphorus in sewage, and resource, device includes biochemical pool, effluent chamber, anode chamber etc., anode chamber and biochemical pool are communicated by first porous structure, anode chamber and effluent chamber are communicated by second porous structure, biological membrane attachment layer is arranged on the outside of first porous structure, cathode layer is arranged on the outside of biological membrane attachment layer, filamentous microalgae are attached on cathode layer, anode carbon felt is arranged on the outside of second porous structure, light source is arranged on the outside of cathode layer, cathode layer and anode carbon felt are connected by external circuit, and external load is arranged on external circuit, water inlet pipe is communicated on biochemical pool, and water outlet pipe is communicated on effluent chamber.The filamentous microalgae of the present application is high in activity, and nitrogen and phosphorus removal efficiency is high, excessive growth biological membrane can be removed by backwashing, to ensure the normal operation of system.

Description

TECHNICAL FIELD

[0001] The present application relates to a sewage biological treatment technology, in particular to a dynamic membrane treatment device and method for simultaneous removal and resource utilization of carbon, nitrogen and phosphorus in sewage. BACKGROUND

[0002] Under the background of today's social development, ecological protection has become a increasingly popular topic, and the prevention and treatment of water pollution and sewage treatment work are gradually emphasized as the mainstream direction. If a large amount of untreated sewage is directly discharged into natural water bodies, it will cause great damage to the ecological environment, seriously affect the local ecological balance, and ultimately endanger human health. In industrial wastewater and domestic sewage, organic carbon, ammonia nitrogen and phosphorus are the main factors causing water pollution. Relevant researchers need to provide effective treatment measures for such sewage to ensure that the treated sewage meets the relevant discharge standards, maintain the ecological environment of the water body, ultimately provide protection for human health and safety, and achieve sustainable development.

[0003] Microorganisms in nature have strong self-adaptability and a wide variety of characteristics. Reasonably introducing and applying microorganisms to sewage treatment work can fully play their role in quickly and accurately degrading various pollutants. In China's sewage treatment process, the A 2 / O process is the mainstream process and perfect direction of sewage treatment, which can achieve the effect of nitrogen and phosphorus removal, and this technology is close to maturity, but still has a series of problems such as poor simultaneous removal of nitrogen and phosphorus, high investment and operation cost, and low recovery rate. The presence of algae can provide an efficient solution to this problem. Algae can perform photosynthesis with light sources and air, carbon dioxide in water bodies to provide sufficient nutrients for their physiological activities, thereby better removing nitrogen and phosphorus. However, in the existing microalgae sewage treatment system, the activity of microalgae is low, the removal efficiency of nitrogen and phosphorus is low, and the membrane pollution is serious in the traditional membrane filtration technology used for algae-water separation, which affects the application and promotion of algae in sewage treatment. SUMMARY

[0004] The purpose of the present application is to provide a dynamic membrane treatment device and method for simultaneous removal and resource utilization of carbon, nitrogen and phosphorus in sewage, to solve the problems of low activity of microalgae, low removal efficiency of nitrogen and phosphorus, serious membrane pollution in the traditional membrane filtration technology used for algae-water separation, and high cost in the existing microalgae sewage treatment system.

[0005] The application is achieved by a dynamic membrane treatment device for synchronous removal and resource utilization of carbon, nitrogen and phosphorus in sewage, which comprises an effluent chamber arranged in a biochemical tank, an anode chamber arranged outside the anode chamber, a first porous structure arranged between the anode chamber and the biochemical tank, a biological membrane attachment layer arranged outside the first porous structure, a biological membrane formed by nitrosifying bacteria and aerobic heterotrophic bacteria attached to the biological membrane attachment layer, a cathode layer arranged outside the biological membrane attachment layer, filamentous microalgae attached to the cathode layer, an anode carbon felt arranged outside the second porous structure, a biological membrane formed by electrogenic bacteria and anaerobic ammonia oxidation bacteria attached to the anode carbon felt, a light source arranged outside the cathode layer, an external circuit connected between the cathode layer and the anode carbon felt, an external load arranged on the external circuit, a water inlet pipe connected to the biochemical tank, and a water outlet pipe connected to the effluent chamber.

[0006] The water outlet pipe is connected to an effluent branch, a backflow branch and an effluent bucket, a pressure gauge, an effluent valve and an effluent pump are arranged on the effluent branch, a loop valve and a backflow pump are arranged on the backflow branch, and an anode chamber drain pipe is connected to the anode chamber, and a backwashing drain valve is arranged on the anode chamber drain pipe.

[0007] The water inlet pipe is connected to a raw water container, a water inlet pump is arranged on the water inlet pipe, a biochemical sludge discharge pipe is connected to the biochemical tank, and a biochemical sludge discharge valve is arranged on the biochemical sludge discharge pipe.

[0008] The effluent chamber is cylindrical, and the anode chamber is annular and nested outside the effluent chamber.

[0009] The first porous structure and the second porous structure are both organic glass porous plates.

[0010] The cathode layer is a stainless steel mesh.

[0011] The biological membrane attachment layer is a non-woven fabric.

[0012] A dynamic membrane treatment method for synchronous removal and resource utilization of carbon, nitrogen and phosphorus in sewage, comprising the following steps.

[0013] a. setting a dynamic membrane treatment device for synchronous removal and resource utilization of carbon, nitrogen and phosphorus in sewage as described above.

[0014] b. sewage containing organic matter, ammonia nitrogen and phosphorus is discharged into the biochemical tank through the water inlet pipe by the water inlet pump, so that the liquid level in the biochemical tank is higher than that in the anode chamber and the effluent chamber.

[0015] c. providing light to the filamentous microalgae attached to the cathode layer by the light source.

[0016] d. Start the effluent pump to discharge the water in the effluent chamber, under the action of negative pressure, the sewage in the biochemical tank enters the anode chamber through the cathode layer and the biofilm attachment layer, and then enters the effluent chamber through the anode carbon felt.

[0017] e. The membrane pressure of the biofilm is monitored by the pressure gauge, when the membrane pressure reaches the backwashing index, the effluent valve and the effluent pump are closed, the backflow valve, the backflow pump and the backwashing drainage valve are opened, the collected treated water is introduced into the effluent chamber, the biofilm on the anode carbon felt is washed off and discharged to the outside of the biochemical tank through the anode chamber drainage pipe, after the excess growth of the biofilm on the anode carbon felt is washed off, the backwashing drainage valve is closed to start washing the biofilm on the biofilm attachment layer, the washed-off biofilm falls off to the biochemical tank and is discharged to the outside of the biochemical tank through the biochemical sludge discharge pipe.

[0018] f. Regularly clean the excess filamentous microalgae on the cathode layer.

[0019] The filamentous microalgae absorb light source and utilize the carbon dioxide produced by the microorganisms attached on the biofilm attachment layer to carry out photosynthesis, thereby providing oxygen and organic matter for the microorganisms on the biofilm attachment layer, and simultaneously purifying the organic matter, NH4 + and PO4 3- in the sewage, the nitrosobacteria on the biofilm attachment layer convert part of the ammonia nitrogen into nitrite nitrogen in a low-dissolved oxygen environment, the electric bacteria on the anode carbon felt degrade COD and generate electric energy, the generated microelectric field produces an electric stimulation effect on the filamentous microalgae to improve the activity of the filamentous microalgae, and the anammox bacteria convert ammonium ion and nitrite into N2 in an anoxic environment.

[0020] By adjusting the light intensity and light time, the physiological activities of the filamentous microalgae and the nitrosobacteria are adjusted, so that the ratio of NH4 + to NO2 - approaches 1:1.32.

[0021] The dynamic membrane treatment device for synchronous removal and resourceization of carbon, nitrogen and phosphorus in sewage of the application can degrade organic matter, remove nitrogen and phosphorus through the biofilm attached on the biofilm attachment layer and the biofilm attached on the cathode layer and the biofilm attachment layer, and the biofilm attached on the anode carbon felt can perform secondary degradation on the organic matter and convert chemical energy into electric energy through the electric bacteria, so that the carbon, nitrogen and phosphorus are efficiently removed and the sewage is resourceized.

[0022] The wastewater carbon-nitrogen-phosphorus synchronous removal and resourceization dynamic membrane treatment method of the application, the wastewater entering the biochemical pool is purified and treated by two-layer biological membrane, then enters the effluent chamber, and is discharged by the effluent pump through the effluent pipe and collected, a pressure gauge is connected on the effluent branch to monitor the membrane pressure of the dynamic biological membrane, when the biological membrane grows excessively to cause the membrane pore blockage and lead to the effluent difficulty, the biological membrane backwashing system composed of the backflow pump, the backflow valve, the backflow branch, the anode chamber effluent pipe and the backwashing effluent valve will backwash the biological membrane on the carbon felt anode to the effluent chamber, when the membrane pressure of the carbon felt anode biological membrane is reduced to normal, the backwashing system backwashes the biological membrane on the biological membrane attachment layer, in order to prevent the biological membrane washed off from the carbon felt anode biological membrane from reattaching on the biological membrane attachment layer, the washed-off biological membrane is discharged in time through the anode chamber effluent pipe, so that the reactor can operate normally. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the structural diagram of the application.

[0024] In the figure: 1, biochemical pool; 2, effluent chamber; 3, anode chamber; 4, first porous structure; 5, second porous structure; 6, biological membrane attachment layer; 7, cathode layer; 8, anode carbon felt; 9, light source; 10, external circuit; 11, external load; 12, raw water container; 13, water inlet pump; 14, water inlet pipe; 15, effluent pipe; 16, effluent branch; 17, backflow branch; 18, effluent bucket; 19, pressure gauge; 20, effluent valve; 21, effluent pump; 22, backflow valve; 23, backflow pump; 24, biochemical sludge discharge pipe; 25, biochemical sludge discharge valve; 26, anode chamber drain pipe; 27, backwashing drain valve. DETAILED DESCRIPTION

[0025] The application relates to a wastewater carbon-nitrogen-phosphorus synchronous removal and resourceization dynamic membrane treatment technology. 2 / O process wastewater treatment effect.

[0026] As shown in Figure 1 , the wastewater carbon-nitrogen-phosphorus synchronous removal and resourceization dynamic membrane treatment device of the application mainly comprises a biochemical pool 1, an effluent chamber 2, an anode chamber 3 and a light source 9.

[0027] The biochemical tank 1 is provided with an effluent chamber 2, and an anode chamber 3 is arranged outside the effluent chamber 2. The anode chamber 3 and the biochemical tank 1 are communicated through a first porous structure 4, and the anode chamber 3 and the effluent chamber 2 are communicated through a second porous structure 5. A biofilm attachment layer 6 is arranged outside the first porous structure 4, and a biofilm formed by nitrosation bacteria and aerobic heterotrophic bacteria is attached to the biofilm attachment layer 6. A cathode layer 7 is arranged outside the biofilm attachment layer 6, and filamentous microalgae are attached to the cathode layer 7. An anode carbon felt 8 is arranged outside the second porous structure 5, and a biofilm formed by electrogenic bacteria and anaerobic ammonia oxidation bacteria is attached to the anode carbon felt 8. A light source 9 is arranged outside the cathode layer 7, and the cathode layer 7 and the anode carbon felt 8 are connected by an external circuit 10. An external load 11 is arranged on the external circuit 10. The biochemical tank 1 is communicated with a water inlet pipe 14, and the effluent chamber 2 is communicated with a water outlet pipe 15.

[0028] The biochemical tank 1 is made of organic glass, and the light emitted by the light source 9 outside the biochemical tank 1 can pass through the wall of the biochemical tank 1 and irradiate the filamentous microalgae attached to the cathode layer 7.

[0029] The effluent chamber 2 is in a cylindrical shape, and the anode chamber 3 is in a circular ring shape and is nested outside the effluent chamber 2. The second porous structure 5 is formed by opening holes in the side wall of one circle of the effluent chamber 2, and the first porous structure 4 is formed by opening holes in the side wall of one circle of the anode chamber 3. The sewage in the biochemical tank 1 can enter the effluent chamber 2 through the first porous structure 4 and the second porous structure 5.

[0030] The biofilm attachment layer 6 is arranged outside the side wall of the anode chamber 3, that is, outside the first porous structure 4. The cathode layer 7 is arranged outside the biofilm attachment layer 6, and the anode carbon felt 8 is arranged outside the second porous structure 5. In this way, the sewage in the biochemical tank 1 needs to pass through the cathode layer 7, the biofilm attachment layer 6, and the anode carbon felt 8 in sequence to enter the effluent chamber 2.

[0031] The biofilm attachment layer 6 is a non-woven fabric, and the biofilm formed by the nitrosation bacteria and the aerobic heterotrophic bacteria is attached to the non-woven fabric. The cathode layer 7 is a stainless steel mesh, and the filamentous microalgae are attached to the stainless steel mesh. The anode carbon felt 8 is a carbon felt with a thickness of 1 cm, and the biofilm formed by the electrogenic bacteria and the anaerobic ammonia oxidation bacteria is attached to the anode carbon felt 8.

[0032] The stainless steel mesh and the carbon felt both have conductivity, and they can be connected through the external circuit 10. A micro-electric field is formed between the anode carbon felt 8 and the cathode layer 7 under the action of the electrogenic bacteria on the anode carbon felt 8, which can stimulate the filamentous microalgae, effectively improve the activity of the filamentous microalgae, and improve the pollutant removal efficiency.

[0033] The filamentous microalgae need to absorb the light source 9 and utilize the carbon dioxide generated by the microorganisms attached on the non-woven fabric to carry out photosynthesis, generate oxygen to provide dissolved oxygen required by the metabolism of the microorganisms on the non-woven fabric, and can also carry out sewage purification. The light source 9 is generally arranged outside the biochemical tank 1, and can be a natural light source 9 or an artificial light source 9.

[0034] In operation, the effluent chamber 2 and the anode chamber 3 need to be always below the liquid level of the biochemical tank 1. The sewage in the biochemical tank 1 is provided by the raw water container 12. The sewage to be treated is stored in the raw water container 12. The raw water container 12 is communicated with the biochemical tank 1 through the water inlet pump 13 and the water inlet pipe 14. The water inlet pump 13 pumps the sewage to the biochemical tank 1 to maintain the liquid level height in the biochemical tank 1.

[0035] The treated water is located in the effluent chamber 2. The water in the effluent chamber 2 is transported to the effluent chamber 2 through the effluent pipe 15 and the effluent branch 16. In the operation process, due to the excessive growth of the biofilm, the membrane pores can be blocked to cause the difficulty of effluent. Therefore, the pressure gauge 19 is arranged on the effluent branch 16 to monitor the membrane pressure of the biofilm. When the membrane pressure is abnormal, the effluent valve 20 and the effluent pump 21 are closed, the backflow valve 22 and the backflow pump 23 on the backflow branch 17 are opened, and the backflushing drainage valve 27 on the anode chamber drainage pipe 26 is opened. The clean effluent in the effluent bucket 18 is backflowed to the effluent chamber 2 to backflush the carbon felt anode biofilm. The backflushed liquid and the shed biofilm are discharged to the outside of the biochemical tank through the anode chamber 3 drainage pipe. When the membrane pressure of the carbon felt anode biofilm is normal, the backflushing drainage valve 27 is closed. The backflushing system backflushes the biofilm on the biofilm attachment layer 6 and the cathode layer 7. The biofilm washed off from the biofilm attachment layer 6 and the cathode layer 7 is discharged to the outside of the biochemical tank through the biochemical sludge discharge pipe 24, so as to ensure the normal operation of the present application.

[0036] The first porous structure 4 and the second porous structure 5 are both organic glass porous plates.

[0037] The biochemical sludge discharge pipe 24 is arranged at the bottom of the biochemical tank 1. The biochemical sludge discharge valve 25 is arranged on the biochemical sludge discharge pipe 24. The biochemical sludge discharge pipe 24 is used to discharge the shed biofilm in the biochemical tank 1.

[0038] The dynamic membrane treatment device for synchronous removal and resourceization of carbon, nitrogen and phosphorus in sewage of the present application can degrade organic matter, remove nitrogen and phosphorus by the biofilm attached on the biofilm attachment layer 6 and the cathode layer 7 attached with filamentous microalgae. The biofilm on the carbon felt anode can carry out secondary degradation of organic matter and convert chemical energy into electrical energy by using electrogenic bacteria. Finally, the present application can realize efficient removal of carbon, nitrogen and phosphorus and resourceization of sewage. The microelectric field generated between the stainless steel mesh cathode and the carbon felt anode can produce electric stimulation on the filamentous microalgae, effectively improve the activity of the filamentous microalgae, and finally improve the pollutant removal efficiency.

[0039] The application also discloses a dynamic membrane treatment method for synchronous removal and resource utilization of carbon, nitrogen and phosphorus in sewage.

[0040] a. Set up the dynamic membrane treatment device for synchronous removal and resource utilization of carbon, nitrogen and phosphorus in sewage as described above.

[0041] Assemble the dynamic membrane treatment device for synchronous removal and resource utilization of carbon, nitrogen and phosphorus in sewage according to the structure described above, inoculate the biofilm formed by electrogenic bacteria and anaerobic ammonia oxidation bacteria on the anode carbon felt 8, inoculate the biofilm formed by nitrosation bacteria and aerobic heterotrophic bacteria on the biofilm attachment layer 6, and inoculate filamentous microalgae on the cathode layer 7.

[0042] b. The sewage containing organic matter, ammonia nitrogen and phosphorus is discharged into the biochemical tank 1 through the water inlet pipe 14 by the water inlet pump 13, so that the liquid level in the biochemical tank 1 is higher than the anode chamber 3 and the water outlet chamber 2.

[0043] The height of the liquid level in the biochemical tank 1 is maintained by the water inlet pump 13, so that it is always higher than the height of the anode chamber 3 and the water outlet chamber 2, thereby ensuring the normal operation of the device.

[0044] c. The filamentous microalgae attached to the cathode layer 7 are provided with light by the light source 9.

[0045] The light source 9 is arranged around the device to ensure that all the filamentous microalgae attached to the stainless steel net are illuminated, and the physiological activities of the filamentous microalgae and the nitrosation bacteria are adjusted by controlling the light intensity and the illumination time, so that the NH4 + : NO2 - Approaches 1:1.32.

[0046] d. The water in the water outlet chamber 2 is discharged by starting the water outlet pump 21, and under the action of negative pressure, the sewage in the biochemical tank 1 enters the anode chamber 3 through the cathode layer 7 and the biofilm attachment layer 6, and then enters the water outlet chamber 2 through the anode carbon felt 8.

[0047] The treated water is discharged and collected by the water outlet pump 21, and after the water in the water outlet chamber 2 is discharged, negative pressure is formed, so that the sewage in the biochemical tank 1 enters the water outlet chamber 2 through the anode chamber 3, and the sewage is treated by the biofilm during the process of passing through the anode chamber 3.

[0048] e. The membrane pressure of the biofilm is monitored by the pressure gauge 19, when the membrane pressure reaches the backwashing index, the water outlet valve 20 and the water outlet pump 21 are closed, the backflow valve 22, the backflow pump 23 and the backwashing drainage valve 27 are opened, the collected treated water is introduced into the water outlet chamber 2, the biofilm on the anode carbon felt 8 is eluted and discharged to the outside of the biochemical tank 1 through the anode chamber 3 drainage pipe, the backwashing drainage valve 27 is closed, the biofilm on the biofilm attachment layer 6 and the cathode layer 7 is backwashed by the backwashing system, the biofilm eluted from the biofilm attachment layer 6 and the cathode layer 7 is discharged to the outside of the biochemical tank through the biochemical sludge discharge pipe 24,

[0049] f. The excess filamentous microalgae on the cathode layer 7 are collected regularly.

[0050] The filamentous microalgae have high oil content and are representatives of algae with high oil content, and appear in many oil production fields such as diesel oil and aviation oil. The excess filamentous microalgae can be collected and used for preparing green and environmentally-friendly diesel oil and aviation oil.

[0051] The filamentous microalgae absorb the light source 9 and perform photosynthesis by using carbon dioxide produced by microorganisms attached to the biofilm attachment layer 6, thereby providing oxygen and organic matter for the microorganisms on the biofilm attachment layer 6, and purifying organic matter, NH4 + and PO4 3- in the sewage, and converting ammonia nitrogen into nitrite nitrogen by nitrosifying bacteria; degrading COD and generating electric energy by electrogenic bacteria, and improving the activity of the filamentous microalgae by the electric stimulation of the generated microelectric field, and converting ammonium ions and nitrite into N2 by anaerobic ammonia oxidation bacteria in the anoxic environment.

[0052] The wastewater carbon-nitrogen-phosphorus synchronous removal and resourceization dynamic membrane treatment method of the application, the wastewater entering the biochemical tank 1 is purified and treated by the two-layer biofilm, then enters the water outlet chamber 2, and is discharged by the water outlet pump 21 through the water outlet pipe 15 and collected, the pressure gauge 19 is connected on the water outlet branch 16 to monitor the membrane pressure of the dynamic biofilm, when the biofilm grows excessively and causes the membrane pore to be blocked, resulting in water outlet difficulty, the biofilm backwashing system composed of the backflow pump 23, the backflow valve 22, the backflow branch 17, the anode chamber 3 water outlet pipe 15 and the backwashing water outlet valve 20 will backflow the collected clean water to the water outlet chamber 2 to backwash the biofilm on the carbon felt anode, when the membrane pressure of the carbon felt anode biofilm is reduced to normal, the backwashing drainage valve 27 is closed, the biofilm on the biofilm attachment layer 6 and the cathode layer 7 is backwashed by the backwashing system, the biofilm eluted from the biofilm attachment layer 6 and the cathode layer 7 is discharged to the outside of the biochemical tank through the biochemical sludge discharge pipe 24, and the reactor is normally operated.

Claims

1. A dynamic membrane treatment device for simultaneous removal and resource utilization of carbon, nitrogen and phosphorus in wastewater, characterized in that: A water outlet chamber is provided in the biochemical pool, and an anode chamber is provided on the outside of the water outlet chamber. The water outlet chamber is cylindrical, and the anode chamber is annular and nested on the outside of the water outlet chamber. The anode chamber and the biochemical pool are connected through a first porous structure, and the anode chamber and the water outlet chamber are connected through a second porous structure. A biofilm attachment layer is provided on the outside of the first porous structure, and a biofilm formed by nitrite bacteria and aerobic heterotrophic bacteria is attached to the biofilm attachment layer. A cathode layer is provided on the outside of the biofilm attachment layer, and filamentous microalgae are attached to the cathode layer. An anode carbon felt is provided on the outside of the second porous structure, and electrogenic bacteria and anaerobic ammonia bacteria are attached to the anode carbon felt. The biofilm formed by oxidizing bacteria is provided with a light source on the outside of the cathode layer, the cathode layer and the anode carbon felt are connected by an external circuit, and an external load is provided on the external circuit, the biochemical pool is connected with a water inlet pipe, and the outlet chamber is connected with a water outlet pipe, the sewage in the biochemical pool enters the anode chamber through the cathode layer and the biofilm attachment layer, and then enters the outlet chamber through the anode carbon felt; the outlet pipe is connected to the outlet bucket through the outlet branch and the reflux branch, a pressure gauge, an outlet valve and an outlet pump are provided on the outlet branch, a loop valve and a reflux pump are provided on the reflux branch, the anode chamber is connected with an anode chamber drain pipe, and a backwash drain valve is provided on the anode chamber drain pipe.

2. The dynamic membrane treatment device for simultaneous removal of carbon, nitrogen and phosphorus from wastewater and recycling of resources according to claim 1 is characterized in that: The water inlet pipe is connected to the raw water container, a water inlet pump is arranged on the water inlet pipe, the bottom of the biochemical pool is connected to a biochemical mud discharge pipe, and a biochemical mud discharge valve is arranged on the biochemical mud discharge pipe.

3. The dynamic membrane treatment device for simultaneous removal of carbon, nitrogen and phosphorus from wastewater and recycling of resources according to claim 1 is characterized in that: The first porous structure and the second porous structure are both organic glass porous plates.

4. The dynamic membrane treatment device for simultaneous removal of carbon, nitrogen and phosphorus from wastewater and recycling of resources according to claim 1 is characterized in that: The cathode layer is a stainless steel mesh.

5. The dynamic membrane treatment device for simultaneous removal of carbon, nitrogen and phosphorus from wastewater and recycling of resources according to claim 1 is characterized in that: The biofilm attachment layer is non-woven fabric.

6. A dynamic membrane treatment method for simultaneous removal and resource utilization of carbon, nitrogen and phosphorus in wastewater, characterized in that: The following steps are involved: a. Using a dynamic membrane treatment device for simultaneous removal and resource utilization of carbon, nitrogen and phosphorus in wastewater according to any one of claims 1 to 5; b. The water inlet pump discharges the wastewater containing organic matter, ammonia nitrogen and phosphorus into the biochemical pool through the water inlet pipe, so that the liquid level in the biochemical pool is higher than the anode chamber and the water outlet chamber; c. providing light to the filamentous microalgae attached to the cathode layer through a light source; d. Start the outlet pump to discharge the water in the outlet chamber. Under the action of negative pressure, the sewage in the biochemical pool enters the anode chamber through the cathode layer and the biofilm attachment layer, and then enters the outlet chamber through the anode carbon felt; e. Monitor the membrane pressure of the biofilm using a pressure gauge. When the membrane pressure reaches the backwash index, close the outlet valve and outlet pump, open the reflux valve, reflux pump, and backwash drain valve, and direct the collected treated water into the outlet chamber. The biofilm on the anode carbon felt and the biofilm attachment layer is washed away and then discharged out of the biochemical pool through the anode chamber drain pipe; f. Regularly clean and collect excess filamentous microalgae on the cathode layer; The filamentous microalgae absorb light and use the carbon dioxide produced by themselves and the microorganisms attached to the biofilm to carry out photosynthesis, providing oxygen for the microorganisms on the biofilm, while purifying organic matter and NH4 in the sewage. + and PO4 3- The nitrite-oxidizing bacteria on the biofilm layer convert part of the ammonia nitrogen into nitrite nitrogen under low dissolved oxygen conditions; the electrogenic bacteria on the anode carbon felt degrade COD and generate electricity. The generated micro-electric field stimulates the filamentous microalgae and increases their activity. The anaerobic ammonia-oxidizing bacteria on the anode convert ammonium ions and nitrite into N2 through their own physiological activities in an oxygen-deficient environment. By controlling the light intensity and illumination time, the physiological activities of filamentous microalgae and nitrosating bacteria can be regulated.

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