A microbial enhanced water treatment method based on carbon fiber filler

Abstract

The present invention belongs to the technical field of wastewater treatment, and specifically relates to a microbial enhanced water treatment method based on carbon fiber fillers. The present invention provides a microbial enhanced water treatment method based on carbon fiber fillers, which realizes the enhancement of extracellular electron transfer by arranging an anode carbon fiber module and a cathode floating module in a hydrolysis acidification tank and constructing a 1~5V microcurrent environment using an electrochemical workstation. The high specific surface area and conductivity of carbon fiber fillers promote microbial attachment and electron transfer. Combined with the micro-electrolysis effect, it significantly improves the degradation efficiency of highly toxic and difficult-to-degrade organic matter and improves the biodegradability of wastewater. The method of the present application integrates physical adsorption, biodegradation and electrochemical oxidation, which solves the problems of low biofilm efficiency and toxic substance inhibition in traditional processes. It has the advantages of high efficiency, low consumption and strong stress resistance, and is suitable for industrial wastewater pretreatment.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a microbial enhanced water treatment method based on carbon fiber filler. Background Art

[0002] Industrial park wastewater involves a wide range of industries and has the characteristics of high pollutant concentration and complex composition. Most of the organic pollutants in the wastewater are highly toxic and difficult to biodegrade. In the field of industrial wastewater treatment, the hydrolysis acidification process is a key pretreatment link in biological treatment. Its core goal is to convert complex organic matter into small molecular substances through microorganisms, improve the biodegradability of wastewater and reduce toxicity. However, the traditional hydrolysis acidification process has significant defects: (1) Low biofilm attachment efficiency: Common fillers (such as plastic fibers and activated carbon) have limited specific surface area and insufficient microbial load, resulting in limited reaction rate. (2) Inhibition by toxic substances: High concentrations of antibiotics, aromatic compounds, etc. inhibit microorganisms, and traditional processes are difficult to break through the toxic barrier. (3) Low electron transfer efficiency: Electron transfer in microbial metabolism relies on natural diffusion, which hinders the degradation path of complex organic matter, especially the decomposition ability of large molecular pollutants (such as antibiotics and polycyclic aromatic hydrocarbons).

[0003] In the existing technology, although there have been attempts to improve the treatment effect by adding chemical agents or improving the filler structure, none of them have solved the problem of efficient coupling between microorganisms and electron transfer media, resulting in the process's treatment effect on highly toxic and difficult-to-degrade wastewater still being unsatisfactory. Summary of the Invention

[0004] The purpose of the present invention is to provide a microbial enhanced water treatment method based on carbon fiber fillers in response to existing problems.

[0005] The present invention is achieved through the following technical solutions:

[0006] A microbial enhanced water treatment method based on carbon fiber filler comprises the following steps:

[0007] S1. Install the anode carbon fiber module, cathode floating module and electrochemical workstation in the hydrolysis acidification tank, and connect the anode and cathode to the electrochemical workstation with wires to form a complete microcurrent reaction system;

[0008] S2. Open the bottom point water distributor to allow the wastewater to be treated to enter the hydrolysis and acidification tank evenly;

[0009] S3. Start the electrochemical workstation, set the operating voltage, form a microcurrent environment between the anode carbon fiber module and the cathode floating module, monitor the effluent results, and discharge them after meeting the standards.

[0010] Furthermore, the anode carbon fiber module described in step S1 is immersed in the bottom of the hydrolysis acidification tank. During the construction of the anode carbon fiber module, the carbon fiber braided rope filler is fixed in the fiberglass frame, and then the fillers are connected in series with graphite ropes. The cathode floating module is located on the water surface of the hydrolysis acidification tank and is in a natural floating state.

[0011] Furthermore, the carbon fiber braided rope filler has a diameter of 80 mm, a center rope diameter of 3 mm, and a weight per meter greater than 30 g.

[0012] Furthermore, the preparation of the carbon fiber braided rope filler comprises the following steps:

[0013] (1) Oxidize the 12k carbon fiber in an air atmosphere at 300-400°C for 1-2 hours, and place the polyetheretherketone fiber in an ultrasonic cleaning machine. After ultrasonic cleaning for 20-40 minutes, take it out and dry it. Then use a fiber carding machine to comb the carbon fiber and polyetheretherketone fiber for later use.

[0014] (2) The treated carbon fiber and polyetheretherketone fiber are mixed in a mass ratio of (6-7): (3-4), and the mixed fiber bundles and the fastening fibers are alternately braided using a 24-spindle high-speed braiding machine to obtain a carbon fiber braided rope;

[0015] (3) Immerse the carbon fiber braided rope in the treatment solution for 3 to 6 hours, then take it out and place it in a vacuum drying oven to dry for 3 to 4 hours. Then, use the chemical vapor deposition method to deposit a layer of nano-titanium dioxide coating on the surface of the carbon fiber braided rope, and then place it in a high-temperature furnace for heat treatment for 1 to 2 hours.

[0016] Furthermore, the fastening fiber is polytetrafluoroethylene fiber. During the weaving process, the tension of the fiber bundle is controlled between 5 and 8 N, the tension of the fastening fiber is between 2 and 4 N, and the weaving speed is 10 to 15 r / min.

[0017] Furthermore, the preparation method of the treatment liquid in step (3) is: dissolving polyaniline in N-methylpyrrolidone to prepare a solution with a mass fraction of 2-5%.

[0018] Furthermore, during the chemical vapor deposition in step (3), the reaction temperature is controlled to be 400-500° C., the reaction time is 40-50 min, and the gas introduced is a mixture of tetrabutyl titanate vapor and oxygen, with gas flow rates of 10-20 sccm and 50-100 sccm, respectively.

[0019] Furthermore, the temperature of the heat treatment in step (3) is 200-300°C.

[0020] Furthermore, the operating voltage in step S3 is 1-5V.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention provides a microbial enhanced water treatment method based on carbon fiber fillers. By setting an anode carbon fiber module and a cathode floating module in a hydrolysis and acidification tank, and using an electrochemical workstation to construct a 1~5V microcurrent environment, the extracellular electron transfer is enhanced. The high specific surface area and conductivity of the carbon fiber filler promote microbial attachment and electron transfer. Combined with the micro-electrolysis effect, it significantly improves the degradation efficiency of highly toxic and difficult-to-degrade organic matter and improves the biodegradability of wastewater. The method of the present application integrates physical adsorption, biodegradation and electrochemical oxidation, solving the problems of low biofilm efficiency and toxic substance inhibition in traditional processes. It has the advantages of high efficiency, low consumption and strong stress resistance, and is suitable for industrial wastewater pretreatment.

[0023] 2. The anode carbon fiber module of the present invention is immersed in the bottom of the hydrolysis and acidification tank. When the wastewater is treated, the bottom point water distributor is opened, and the wastewater passes through the bottom sludge layer and the anode carbon fiber module from bottom to top and enters the hydrolysis and acidification tank. In this process, the wastewater is fully in contact with the bottom sludge and carbon fiber biofilm, and substance exchange and reaction occur. The high specific surface area of the carbon fiber braided rope filler provides a large number of microbial attachment sites. Its surface negative charge characteristics preferentially adsorb negatively charged hydrolysis and acidification bacteria to form a high-density biofilm. In a microcurrent environment, the carbon fiber braided rope filler acts as an electron acceptor to accelerate the extracellular electron transfer of microorganisms, promote the chain scission and ring opening of macromolecular organic matter (such as antibiotics and benzene ring compounds), and at the same time destroy the molecular structure of toxic substances (such as antibiotic β-lactam ring) through electrolysis, reducing biological toxicity. After starting the electrochemical workstation, the biofilm on the surface of the anode carbon fiber filler produces an electron withdrawal effect. The generated electrons are conducted to the cathode floating module through the graphite rope conductive network and combined with oxygen in the air to complete the electron transfer cycle. During this process, microorganisms are affected by the electron withdrawal and accelerate the decomposition of organic matter to replenish electrons, thereby increasing the degradation rate of organic matter in the wastewater. This invention fixes the carbon fiber braided rope filler within a fiberglass reinforced plastic frame. The glass frame is corrosion-resistant, can withstand biofilm loads, and is adaptable to complex industrial wastewater environments.

[0024] 3. The carbon fiber of the present invention is alternately woven with carbon fiber bundles doped with polyetheretherketone fibers and fastening fibers using a 24-spindle high-speed braiding machine, and then immersed in a treatment solution. As the solvent N-methylpyrrolidone evaporates, polyaniline gradually deposits on the fiber surface and forms a continuous film. This film can establish a conductive connection between the fibers, allowing electrons to be transferred more smoothly between different fibers, thereby forming a conductive network, enhancing the conductive properties of the filler, and also playing a certain protective role. A layer of nano-titanium dioxide coating is then deposited on the surface of the carbon fiber braided rope using a chemical vapor deposition method. The nano-titanium dioxide coating has good photocatalytic properties and chemical stability, can decompose organic matter adsorbed on the filler surface, prevent microbial attachment and corrosion, and also enhance the mechanical properties of the filler. Finally, heat treatment is performed to eliminate internal stress, improve the bonding strength between the fibers and the stability of the coating.

[0025] 4. The cathode module of this invention floats on the surface of the hydrolysis and acidification tank, utilizing atmospheric oxygen as the terminal electron acceptor. This avoids the microbial inhibition caused by electron accumulation in traditional processes while also reducing energy consumption (requiring only 1-5 low-voltage power supplies). The triple coupling of physical adsorption (carbon fiber specific surface area), biodegradation (high-density bacterial population), and electrochemical oxidation (micro-electrolysis effect) achieves a chain-like degradation of highly toxic organic matter: adsorption, electron deprivation, structural destruction, and biomineralization. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the fiberglass support frame and carbon fiber braided rope filler of the present invention;

[0027] Figure 2 This is a schematic diagram of the interconnection between the carbon fiber braided rope filler and the graphite rope of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection between the anode carbon fiber filler, cathode floating module and electrochemical workstation of the present invention;

[0029] In the figure: 1. Cathode floating module; 2. Anode carbon fiber module; 3. Electrochemical workstation. DETAILED DESCRIPTION

[0030] In order to further explain the present invention, it is described below with reference to the following specific embodiments.

[0031] Unless otherwise specified, the raw materials used in the present invention are all conventional products purchased from the market.

[0032] Example 1

[0033] A microbial enhanced water treatment method based on carbon fiber filler comprises the following steps:

[0034] S1. Install the anode carbon fiber module 2, cathode floating module 1 and electrochemical workstation 3 in the hydrolysis acidification tank, and connect the anode and cathode to the electrochemical workstation 3 with wires to form a complete microcurrent reaction system;

[0035] The anode carbon fiber module 2 is immersed in the bottom of the hydrolysis acidification tank. During the construction of the anode carbon fiber module 2, the carbon fiber braided rope filler is fixed in the fiberglass frame, and then the fillers are connected in series with graphite ropes. The cathode floating module 1 is located on the water surface of the hydrolysis acidification tank and presents a natural floating state.

[0036] The carbon fiber braided rope filler has a diameter of 80 mm, a center rope diameter of 3 mm, and a weight of more than 30 g per meter;

[0037] The preparation of the carbon fiber braided rope filler comprises the following steps:

[0038] (1) The 12k carbon fiber was oxidized in an air atmosphere at 300°C for 1 hour, and the polyetheretherketone fiber was placed in an ultrasonic cleaning machine. After ultrasonic cleaning for 20 minutes, the fibers were taken out and dried. Then, a fiber carding machine was used to card the carbon fiber and polyetheretherketone fibers for later use.

[0039] (2) The treated carbon fiber and polyetheretherketone fiber were mixed in a mass ratio of 6:3, and the mixed fiber bundles and polytetrafluoroethylene fibers were alternately woven into a carbon fiber braided rope using a 24-spindle high-speed braiding machine. During the braiding process, the tension of the fiber bundle was controlled between 5N and the tension of the polytetrafluoroethylene fiber was controlled between 2N, and the braiding speed was 10 r / min;

[0040] (3) Dissolve polyaniline in N-methylpyrrolidone to prepare a solution with a mass fraction of 2% as the treatment solution, immerse the carbon fiber braided rope in the treatment solution, soak for 3 hours, take it out and place it in a vacuum drying oven to dry for 3 hours, then use chemical vapor deposition to deposit a layer of nano-titanium dioxide coating on the surface of the carbon fiber braided rope, and then place it in a high-temperature furnace for heat treatment at 200°C for 1 hour;

[0041] During the chemical vapor deposition, the reaction temperature was controlled to be 400° C., the reaction time was 40 min, and the gas introduced was a mixture of tetrabutyl titanate vapor and oxygen, with gas flow rates of 10 sccm and 50 sccm, respectively.

[0042] S2. Open the bottom point water distributor to allow the wastewater to be treated to enter the hydrolysis and acidification tank evenly;

[0043] S3. Start the electrochemical workstation 3, set the operating voltage (1V), form a microcurrent environment between the anode carbon fiber module 2 and the cathode floating module 1, monitor the effluent results, and discharge them after meeting the standards; finally, regularly aerate and remove excess biofilm through the backwash system to maintain the activity of the filler; the deodorization ventilation system provides oxygen to the cathode and replaces the air in the pool to ensure the efficiency of electron transfer and stable operation of the system.

[0044] Example 2

[0045] A microbial enhanced water treatment method based on carbon fiber filler comprises the following steps:

[0046] S1. Install the anode carbon fiber module 2, cathode floating module 1 and electrochemical workstation 3 in the hydrolysis acidification tank, and connect the anode and cathode to the electrochemical workstation 3 with wires to form a complete microcurrent reaction system;

[0047] The anode carbon fiber module 2 is immersed in the bottom of the hydrolysis acidification tank. During the construction of the anode carbon fiber module 2, the carbon fiber braided rope filler is fixed in the fiberglass frame, and then the fillers are connected in series with graphite ropes. The cathode floating module 1 is located on the water surface of the hydrolysis acidification tank and presents a natural floating state.

[0048] The carbon fiber braided rope filler has a diameter of 80 mm, a center rope diameter of 3 mm, and a weight of more than 30 g per meter;

[0049] The preparation of the carbon fiber braided rope filler comprises the following steps:

[0050] (1) The 12k carbon fiber was oxidized in an air atmosphere at 350°C for 1.5 h, and the polyetheretherketone fiber was placed in an ultrasonic cleaning machine. After ultrasonic cleaning for 30 min, the fibers were taken out and dried. Then, a fiber carding machine was used to card the carbon fiber and polyetheretherketone fibers for later use.

[0051] (2) The treated carbon fiber and polyetheretherketone fiber were mixed in a mass ratio of 6.5:3.5, and the mixed fiber bundles and polytetrafluoroethylene fibers were alternately woven into a carbon fiber braided rope using a 24-spindle high-speed braiding machine. During the braiding process, the tension of the fiber bundle was controlled between 6N and the tension of the polytetrafluoroethylene fiber was controlled between 3N, and the braiding speed was 12 r / min;

[0052] (3) Dissolve polyaniline in N-methylpyrrolidone to prepare a solution with a mass fraction of 3.5% as the treatment solution. Immerse the carbon fiber braided rope in the treatment solution for 4.5 hours, then take it out and dry it in a vacuum drying oven for 3.5 hours. Then, use chemical vapor deposition to deposit a layer of nano-titanium dioxide coating on the surface of the carbon fiber braided rope, and then place it in a high-temperature furnace for heat treatment at 250°C for 1.5 hours.

[0053] During the chemical vapor deposition, the reaction temperature was controlled to be 450° C., the reaction time was 45 min, and the gas introduced was a mixture of tetrabutyl titanate vapor and oxygen, with gas flow rates of 15 sccm and 75 sccm, respectively.

[0054] S2. Open the bottom point water distributor to allow the wastewater to be treated to enter the hydrolysis and acidification tank evenly;

[0055] S3. Start the electrochemical workstation 3, set the operating voltage (3V), form a microcurrent environment between the anode carbon fiber module 2 and the cathode floating module 1, monitor the effluent results, and discharge them after meeting the standards; finally, regularly aerate and remove excess biofilm through the backwash system to maintain the activity of the filler; the deodorization ventilation system provides oxygen to the cathode and replaces the air in the pool to ensure the efficiency of electron transfer and stable operation of the system.

[0056] Example 3

[0057] A microbial enhanced water treatment method based on carbon fiber filler comprises the following steps:

[0058] S1. Install the anode carbon fiber module 2, cathode floating module 1 and electrochemical workstation 3 in the hydrolysis acidification tank, and connect the anode and cathode to the electrochemical workstation 3 with wires to form a complete microcurrent reaction system;

[0059] The anode carbon fiber module 2 is immersed in the bottom of the hydrolysis acidification tank. During the construction of the anode carbon fiber module 2, the carbon fiber braided rope filler is fixed in the fiberglass frame, and then the fillers are connected in series with graphite ropes. The cathode floating module 2 is located on the water surface of the hydrolysis acidification tank and presents a natural floating state.

[0060] The carbon fiber braided rope filler has a diameter of 80 mm, a center rope diameter of 3 mm, and a weight of more than 30 g per meter;

[0061] The preparation of the carbon fiber braided rope filler comprises the following steps:

[0062] (1) The 12k carbon fiber was oxidized in an air atmosphere at 400°C for 2 h, and the polyetheretherketone fiber was placed in an ultrasonic cleaning machine. After ultrasonic cleaning for 40 min, the fibers were taken out and dried. Then, a fiber carding machine was used to card the carbon fiber and polyetheretherketone fibers for later use.

[0063] (2) The treated carbon fiber and polyetheretherketone fiber were mixed in a mass ratio of 7:4, and the mixed fiber bundles and polytetrafluoroethylene fibers were alternately woven into a carbon fiber braided rope using a 24-spindle high-speed braiding machine. During the braiding process, the tension of the fiber bundle was controlled between 8N and the tension of the polytetrafluoroethylene fiber was controlled between 4N, and the braiding speed was 15 r / min.

[0064] (3) Dissolve polyaniline in N-methylpyrrolidone to prepare a solution with a mass fraction of 5% as the treatment solution. Immerse the carbon fiber braided rope in the treatment solution for 6 hours, then take it out and dry it in a vacuum drying oven for 4 hours. Then, use chemical vapor deposition to deposit a layer of nano-titanium dioxide coating on the surface of the carbon fiber braided rope, and then place it in a high-temperature furnace for heat treatment at 300°C for 2 hours.

[0065] During the chemical vapor deposition, the reaction temperature was controlled to be 500° C., the reaction time was 50 min, and the gas introduced was a mixture of tetrabutyl titanate vapor and oxygen, with gas flow rates of 20 sccm and 100 sccm, respectively.

[0066] S2. Open the bottom point water distributor to allow the wastewater to be treated to enter the hydrolysis and acidification tank evenly;

[0067] S3. Start the electrochemical workstation 3, set the operating voltage (5V), form a microcurrent environment between the anode carbon fiber module 2 and the cathode floating module 1, monitor the effluent results, and discharge them after meeting the standards; finally, regularly aerate and remove excess biofilm through the backwash system to maintain the activity of the filler; the deodorization ventilation system provides oxygen to the cathode and replaces the air in the pool to ensure the efficiency of electron transfer and stable operation of the system.

[0068] Comparative Example 1

[0069] The difference between Comparative Example 1 and Example 2 is that the 12k carbon fiber is not subjected to oxidation treatment in step (1), and the rest of the technical solutions are the same as those in Example 2.

[0070] Comparative Example 2

[0071] The difference between this comparative example 2 and embodiment 2 is that the soaking treatment with the treatment liquid is not performed in step (3), and the rest of the technical solutions are the same as those in embodiment 2.

[0072] Comparative Example 3

[0073] The difference between this comparative example 3 and Example 2 is that no chemical deposition treatment is performed in step (3), and the rest of the technical solutions are the same as those in Example 2.

[0074] Comparative Example 4

[0075] The difference between this comparative example 4 and Example 2 is that no heat treatment is performed in step (3), and the rest of the technical solutions are the same as those in Example 2.

[0076] Taking the pharmaceutical wastewater from Suzhou, Anhui as the treatment object, the COD of the wastewater was detected to be 8000±200mg / L, the gold toxin concentration was 50±5mg / L, B / C was 0.15±0.02, and the conductivity was 8000±500μS / cm. During the experiment, the filler in the anode carbon fiber module was 20% (volume share), and the spacing between the carbon fiber braided ropes was 10cm.

[0077] Wastewater was treated using the methods of Examples 1-3 and Comparative Examples 1-4, respectively. Influent and effluent samples were collected three times daily (8 hours apart). Three replicates were taken for each test, and the average value was calculated. The test was continued for 15 consecutive days, and the 15-day average data was used as the comparison result. The test results are shown in Table 1 below.

[0078] Table 1 Wastewater treatment conditions of Examples 1 to 3 and Comparative Examples 1 to 4

[0079] COD removal rate (%) Gold toxin degradation rate (%) B / C Biofilm density (μm) Example 1 87 93 0.45 190 Example 2 89 94 0.45 200 Example 3 88 92 0.44 200 Comparative Example 1 82 89 0.41 180 Comparative Example 2 79 83 0.38 160 Comparative Example 3 76 84 0.35 170 Comparative Example 4 85 91 0.45 180

[0080] It can be concluded from Table 1 above that the method of the present invention has a COD removal rate of up to 89%, and a degradation rate of antibiotics such as gold toxins of up to 94%, breaking the bottleneck of "biological toxicity-low degradation efficiency". The B / C ratio is increased from 0.15 to 0.45, and "difficult-to-biodegrade wastewater" is converted into "easy-to-biodegrade wastewater", saving a lot of energy consumption for the entire process. The biofilm thickness reaches 200 μm, providing sufficient active sites for microorganisms, helping to achieve efficient electron transfer, and thus improving treatment efficiency.

[0081] To further compare the effects of the present invention, a long-term stability test was conducted on the microbial enhanced water treatment method based on carbon fiber fillers provided in Example 2. The method was operated continuously for 6 months, and the COD, B / C, conductivity, and gold toxin degradation rate were tested daily. The biofilm status (thickness and color) was observed weekly, and the filler resistivity was measured (four-probe method).

[0082] The test results are shown in Table 2 below.

[0083] Table 2 Long-term stability test results of the microbial enhanced water treatment method based on carbon fiber fillers of the present invention

[0084] Monitoring indicators Test results COD removal rate Between 85% and 89% during the test period B / C Improved from 0.15 and stabilized at 0.43~0.45 Gold toxin degradation rate Stable at 89~94% Filler resistivity From 0.09Ω·cm to 0.10Ω·cm, an increase of 11% Biofilm thickness Thickness is stable at 160~200μm Packing integrity The anode and cathode modules have no damage or deformation within 6 months, the connection is firm, and the carbon fiber rope has no looseness or breakage

[0085] As can be seen from Table 2 above, the microbial enhanced water treatment method based on carbon fiber filler provided by the present invention has a stable COD removal rate of 85-89% after 60 days of continuous operation, with a fluctuation of <5%, and the B / C is maintained at 0.43-0.45 without a significant decrease. The filler resistivity increases by 11% within 60 days, proving that the conductive performance is stable. The above results show that the present invention can continuously and efficiently remove pollutants, and the conductive performance and physical structure of the anode carbon fiber filler are stable, the biofilm activity is good, and the system energy consumption is low, which can provide reliable technical support for the long-term stable treatment of industrial wastewater.

[0086] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A microbial enhanced water treatment method based on carbon fiber filler, characterized in that: The steps include: S1. Install the anode carbon fiber module, cathode floating module and electrochemical workstation in the hydrolysis acidification tank, and connect the anode and cathode to the electrochemical workstation with wires to form a complete microcurrent reaction system; The anode carbon fiber module is immersed in the bottom of the hydrolysis acidification tank. During the construction of the anode carbon fiber module, the carbon fiber braided rope filler is fixed in the fiberglass frame, and then the fillers are connected in series with graphite ropes. The cathode floating module is located on the water surface of the hydrolysis acidification tank and presents a natural floating state. The preparation of the carbon fiber braided rope filler comprises the following steps: (1) Oxidize the 12k carbon fiber in an air atmosphere at 300-400°C for 1-2 hours, and place the polyetheretherketone fiber in an ultrasonic cleaning machine. After ultrasonic cleaning for 20-40 minutes, take it out and dry it. Then use a fiber carding machine to comb the carbon fiber and polyetheretherketone fiber for later use. (2) The treated carbon fiber and polyetheretherketone fiber are mixed in a mass ratio of (6-7): (3-4), and the mixed fiber bundles and the fastening fibers are alternately braided using a 24-spindle high-speed braiding machine to obtain a carbon fiber braided rope; (3) Immerse the carbon fiber braided rope in the treatment solution for 3 to 6 hours, then take it out and place it in a vacuum drying oven to dry for 3 to 4 hours. Then, use the chemical vapor deposition method to deposit a layer of nano-titanium dioxide coating on the surface of the carbon fiber braided rope, and then place it in a high-temperature furnace for heat treatment for 1 to 2 hours. S2. Open the bottom point water distributor to allow the wastewater to be treated to enter the hydrolysis and acidification tank evenly; S3. Start the electrochemical workstation, set the operating voltage, form a microcurrent environment between the anode carbon fiber module and the cathode floating module, monitor the effluent results, and discharge them after meeting the standards.

2. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: The carbon fiber braided rope filler has a diameter of 80 mm, a center rope diameter of 3 mm, and a weight of more than 30 g per meter.

3. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: The fastening fiber is polytetrafluoroethylene fiber. During the weaving process, the tension of the fiber bundle is controlled between 5 and 8 N, the tension of the fastening fiber is between 2 and 4 N, and the weaving speed is 10 to 15 r / min.

4. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: The preparation method of the treatment liquid described in step (3) is: dissolving polyaniline in N-methylpyrrolidone to prepare a solution with a mass fraction of 2-5%.

5. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: During the chemical vapor deposition in step (3), the reaction temperature is controlled to be 400-500°C, the reaction time is 40-50 min, and the gas introduced is a mixture of tetrabutyl titanate vapor and oxygen, with gas flow rates of 10-20 sccm and 50-100 sccm, respectively.

6. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: The temperature of the heat treatment in step (3) is 200-300°C.

7. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: The operating voltage in step S3 is 1-5V.

8. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that: The backwash system is used to regularly aerate and remove excess biofilm to maintain filler activity; the deodorization ventilation system provides oxygen to the cathode and replaces the air in the pool to ensure electron transfer efficiency and stable system operation.

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