Microbial enhanced water treatment method based on carbon fiber filler

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a microbial enhanced water treatment method based on a carbon fiber filler. The invention provides a microbial enhanced water treatment method based on a carbon fiber filler, which is characterized in that an anode carbon fiber module and a cathode floating module are arranged in a hydrolysis acidification pool, and a 1-5V micro-current environment is constructed by utilizing an electrochemical workstation, so that extracellular electron transfer enhancement is realized. The high specific surface area and conductivity of the carbon fiber filler promote microbial attachment and electron transport, and in combination with the microelectrolysis effect, the degradation efficiency of high-toxicity and refractory organic matters is remarkably improved, and the biodegradability of wastewater is improved. The method integrates physical adsorption, biodegradation and electrochemical oxidation, solves the problems of low biofilm efficiency, toxic substance inhibition and the like in the traditional process, has the advantages of high efficiency, low consumption and strong stress resistance, and is suitable for industrial wastewater pretreatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and particularly relates to a method for strengthening water treatment by microorganisms based on carbon fiber fillers. 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 for biological treatment. Its core goal is to convert complex organic substances into small molecules through microorganisms, improve the biodegradability of wastewater and reduce toxicity. However, the traditional hydrolysis acidification process has significant defects: (1) Low biofilm attachment efficiency: The specific surface areas of commonly used fillers (such as plastic fibers and activated carbon) are limited, and the microbial load is insufficient, resulting in limited reaction rates. (2) Inhibition by toxic substances: High concentrations of antibiotics, aromatic compounds, etc. inhibit microorganisms, and it is difficult for traditional processes to break through the toxicity barrier. (3) Low electron transfer efficiency: In the microbial metabolism process, electron transfer depends on natural diffusion, and the degradation path of complex organic substances is blocked, especially the decomposition ability of macromolecular pollutants (such as antibiotics and polycyclic aromatic hydrocarbons) is insufficient.

[0003] In the prior art, although there have been attempts to improve the treatment effect by adding chemical agents or modifying the filler structure, the problem of efficient coupling between microorganisms and electron transfer media has not been solved, resulting in unsatisfactory treatment effects of the process on highly toxic and difficult-to-degrade wastewater. Summary of the Invention

[0004] The purpose of the present invention is to address the existing problems and provide a method for strengthening water treatment by microorganisms based on carbon fiber fillers.

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

[0006] A method for strengthening water treatment by microorganisms based on carbon fiber fillers includes the following steps:

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

[0008] S2. Turn on the bottom dot water distributor to evenly introduce the wastewater to be treated into the hydrolysis acidification tank;

[0009] S3. Start the electrochemical workstation, set the operating voltage, form a micro-current environment between the anode carbon fiber module and the cathode floating module, monitor the effluent result, and discharge it after reaching the standard.

[0010] Further, 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 packing is fixed in the fiberglass frame, and then each packing is connected in series with a graphite rope. The cathode floating module is located on the water surface of the hydrolysis acidification tank, presenting a natural floating state.

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

[0012] Further, the preparation of the carbon fiber braided rope packing includes the following steps:

[0013] (1) Oxidize 12k carbon fiber in an air atmosphere at 300 - 400 °C for 1 - 2 h. At the same time, place the polyetheretherketone fiber in an ultrasonic cleaner, take it out and dry it after ultrasonic washing for 20 - 40 min, and then use a fiber carding machine to card the carbon fiber and polyetheretherketone fiber for standby;

[0014] (2) Mix the treated carbon fiber and polyetheretherketone fiber according to a mass ratio of (6 - 7):(3 - 4), and alternately braid the mixed fiber bundle and fastening fiber through 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 liquid, soak it for 3 - 6 h, then take it out and dry it in a vacuum drying oven for 3 - 4 h. 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 - 2 h.

[0016] Further, the fastening fiber is polytetrafluoroethylene fiber. During the braiding process, control the tension of the fiber bundle between 5 - 8 N, the tension of the fastening fiber between 2 - 4 N, and the braiding speed at 10 - 15 r / min.

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

[0018] Further, during the chemical vapor deposition in step (3), control the reaction temperature at 400 - 500 °C, the reaction time at 40 - 50 min, and the gases introduced are a mixed gas of tetrabutyl titanate vapor and oxygen, and the gas flow rates are 10 - 20 sccm and 50 - 100 sccm respectively.

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

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

[0021] The present invention has the following advantages compared with the prior art:

[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 the hydrolysis acidification tank and using an electrochemical workstation to construct a micro-current environment of 1-5V, extracellular electron transfer is enhanced. The high specific surface area and conductivity of the carbon fiber fillers promote microbial attachment and electron transfer. Combining with the micro-electrolysis effect, the degradation efficiency of highly toxic and refractory organic compounds is significantly improved, and the biodegradability of wastewater is improved. The method of the present application integrates physical adsorption, biodegradation and electrochemical oxidation, solves the problems of low biofilm efficiency and inhibition by toxic substances in traditional processes, and has the advantages of high efficiency, low energy consumption and strong stress resistance, and is suitable for the pretreatment of industrial wastewater.

[0023] 2. The anode carbon fiber module of the present invention is immersed in the bottom of the hydrolysis acidification tank. When treating wastewater, the bottom dot water distributor is turned on, and the wastewater passes through the bottom sludge layer and the anode carbon fiber module from bottom to top and enters the hydrolysis acidification tank. In this process, the wastewater is in full contact with the bottom sludge and the carbon fiber biofilm, and mass exchange and reaction occur. The high specific surface area of the carbon fiber braided rope filler provides a large number of microbial attachment sites, and its surface negative charge characteristics preferentially adsorb negatively charged hydrolysis acidification bacteria groups to form a high-density biofilm. In the micro-current environment, the carbon fiber braided rope filler acts as an electron acceptor to accelerate the extracellular electron transfer of microorganisms, promote the breaking of chains and opening of rings of macromolecular organic compounds (such as antibiotics and benzene ring compounds), and at the same time destroy the molecular structure of toxic substances (such as the β-lactam ring of antibiotics) through electrolysis to reduce biological poison gas. After starting the electrochemical workstation, an electron extraction effect is generated on the surface biofilm of the anode carbon fiber filler, and 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. In this process, the microorganisms are affected by electron extraction and accelerate the decomposition of organic matter to supplement electrons, thereby increasing the degradation rate of organic matter in the wastewater. The carbon fiber braided rope filler of the present invention is fixed in a fiberglass frame. The fiberglass frame is corrosion-resistant, can bear the biofilm load, and is suitable for complex industrial wastewater environments.

[0024] 3. The carbon fiber of the present invention is obtained by alternately weaving a carbon fiber bundle doped with polyether ether ketone fiber and fastening fiber using a 24-spindle high-speed weaving machine, and then immersing it in a treatment liquid. As the solvent N-methylpyrrolidone volatilizes, polyaniline will gradually deposit on the fiber surface and form a continuous film. This film can establish a conductive connection between the fibers, enabling electrons to be transferred more smoothly between different fibers, thereby forming a conductive network, enhancing the conductive performance of the filler, and also playing a certain protective role. Then, a layer of nano-titanium dioxide coating is deposited on the surface of the carbon fiber braided rope by chemical vapor deposition. The nano-titanium dioxide coating has good photocatalytic performance and chemical stability, can decompose the 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 carried out to eliminate internal stress and improve the bonding strength between the fibers and the stability of the coating.

[0025] 4. The cathode module of the present invention floats on the water surface of the hydrolysis acidification tank, using air oxygen as the terminal electron acceptor, avoiding the inhibition of microorganisms caused by electron accumulation in the traditional process, and reducing energy consumption at the same time (only 1-5 low-voltage power supplies are required). The triple effects of physical adsorption (carbon fiber specific surface area) + biodegradation (high-density microbial population) + electrochemical oxidation (micro-electrolysis effect) are coupled to achieve the "adsorption - electron deprivation - structure destruction - biological mineralization" chain degradation of highly toxic organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0030] In order to further explain the present invention, the following specific embodiments are described below.

[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 includes the following steps:

[0034] S1. Install an anode carbon fiber module 2, a cathode floating module 1 and an electrochemical workstation 3 in the hydrolysis acidification tank. Connect the anode and the cathode to the electrochemical workstation 3 respectively with wires to form a complete micro-current 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, fix the carbon fiber braided rope filler in the fiberglass frame, and then connect each filler in series with a graphite rope. 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 central rope diameter of 3 mm, and a weight per meter greater than 30 g;

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

[0038] (1) Oxidize 12k carbon fiber in an air atmosphere at 300 °C for 1 h. At the same time, place the polyether ether ketone fiber in an ultrasonic cleaner, take it out and dry it after ultrasonic washing for 20 min, and then use a fiber carding machine to card the carbon fiber and the polyether ether ketone fiber for standby;

[0039] (2) Mix the treated carbon fiber and polyether ether ketone fiber according to a mass ratio of 6:3, and alternately braid the mixed fiber bundle and polytetrafluoroethylene fiber through a 24-spindle high-speed braiding machine to obtain a carbon fiber braided rope. During the braiding process, control the tension of the fiber bundle between 5 N, the tension of the polytetrafluoroethylene fiber between 2 N, and the braiding speed at 10 r / min;

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

[0041] During the chemical vapor deposition, control the reaction temperature at 400 °C, the reaction time at 40 min, and the gases introduced are a mixed gas of tetrabutyl titanate vapor and oxygen, and the gas flow rates are 10 sccm and 50 sccm respectively;

[0042] S2. Open the bottom dot water distributor to evenly introduce the wastewater to be treated into the hydrolysis acidification tank;

[0043] S3. Start the electrochemical workstation 3, set the operating voltage (1V), form a micro-current environment between the anode carbon fiber module 2 and the cathode floating module 1, monitor the effluent result, and discharge after reaching the standard; finally, regularly aerate through the backwashing system to remove the excessive biofilm and maintain the activity of the packing; the deodorization ventilation system provides oxygen for the cathode and replaces the air in the pool to ensure the electron transfer efficiency and the stable operation of the system.

[0044] Example 2

[0045] A microbial enhanced water treatment method based on carbon fiber packing, comprising the following steps:

[0046] S1. Install the anode carbon fiber module 2, the cathode floating module 1 and the electrochemical workstation 3 in the hydrolysis acidification tank, and connect the anode and the cathode to the electrochemical workstation 3 with wires respectively to form a complete micro-current 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, fix the carbon fiber braided rope packing in the fiberglass frame, and then connect each packing in series with the graphite rope. 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 packing has a diameter of 80 mm, a central rope diameter of 3 mm, and a weight per meter of more than 30 g;

[0049] The preparation of the carbon fiber braided rope packing includes the following steps:

[0050] (1) Oxidize 12k carbon fiber in an air atmosphere at 350 °C for 1.5 h. At the same time, place the polyether ether ketone fiber in an ultrasonic cleaner, take it out and dry it after ultrasonic washing for 30 min, and then use a fiber carding machine to card the carbon fiber and the polyether ether ketone fiber for standby;

[0051] (2) Mix the treated carbon fiber and polyether ether ketone fiber according to a mass ratio of 6.5:3.5, and alternately braid the mixed fiber bundle and polytetrafluoroethylene fiber through a 24-spindle high-speed braiding machine to obtain a carbon fiber braided rope. During the braiding process, control the tension of the fiber bundle between 6 N, the tension of the polytetrafluoroethylene fiber between 3 N, and the braiding speed at 12 r / min;

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

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

[0054] S2. Open the bottom dot water distributor to evenly introduce the wastewater to be treated into the hydrolysis acidification tank;

[0055] S3. Start the electrochemical workstation 3, set the operating voltage (3 V), form a microcurrent environment between the anode carbon fiber module 2 and the cathode floating module 1, monitor the effluent result, and discharge after reaching the standard; finally, regularly aerate through the backwashing system to remove excessive biofilm and maintain the activity of the packing; the deodorization ventilation system provides oxygen for the cathode and replaces the air in the tank to ensure the electron transfer efficiency and the stable operation of the system.

[0056] Example 3

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

[0058] S1. Install the anode carbon fiber module 2, the cathode floating module 1 and the electrochemical workstation 3 in the hydrolysis acidification tank, and connect the anode and the cathode to the electrochemical workstation 3 with wires respectively 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 packing is fixed in the fiberglass frame, and then each packing is connected in series with a graphite rope. 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 packing has a diameter of 80 mm, a central rope diameter of 3 mm, and a weight per meter of more than 30 g;

[0061] The preparation of the carbon fiber braided rope packing includes the following steps:

[0062] (1) Oxidize 12k carbon fiber in an air atmosphere at 400 °C for 2 h. At the same time, place the polyether ether ketone fiber in an ultrasonic cleaner, take it out and dry it after ultrasonic washing for 40 min, and then use a fiber carding machine to card the carbon fiber and the polyether ether ketone fiber for standby;

[0063] (2) Mix the treated carbon fiber and polyether ether ketone fiber according to a mass ratio of 7:4, and alternately braid the mixed fiber bundle and polytetrafluoroethylene fiber through a 24-spindle high-speed braiding machine to obtain a carbon fiber braided rope. During the braiding process, control the tension of the fiber bundle between 8 N and the tension of the polytetrafluoroethylene fiber between 4 N, and the braiding speed is 15 r / min;

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

[0065] During the chemical vapor deposition, control the reaction temperature at 500 °C, the reaction time at 50 min, and the gas introduced is a mixed gas of tetrabutyl titanate vapor and oxygen, and the gas flow rates are 20 sccm and 100 sccm respectively;

[0066] S2. Open the bottom dot water distributor to evenly introduce the wastewater to be treated into the hydrolysis acidification tank;

[0067] S3. Start the electrochemical workstation 3, set the operating voltage (5 V), form a micro-current environment between the anode carbon fiber module 2 and the cathode floating module 1, monitor the effluent result, and discharge after reaching the standard; finally, regularly aerate through the backwashing system to remove the excessive biofilm and maintain the activity of the packing; the deodorization ventilation system provides oxygen for the cathode and replaces the air in the tank to ensure the electron transfer efficiency and the stable operation of the system.

[0068] Comparative Example 1

[0069] The difference between this Comparative Example 1 and Example 2 is that in step (1), the 12k carbon fiber is not oxidized, 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 Example 2 is that in step (3), the soaking treatment with the treatment solution is not carried out, and the rest of the technical solutions are the same as those in Example 2.

[0072] Comparative Example 3

[0073] The difference between this Comparative Example 3 and Example 2 is that in step (3), the chemical deposition treatment is not carried out, 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 in step (3), the heat treatment is not carried out, and the rest of the technical solutions are the same as those in Example 2.

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

[0077] The above-mentioned methods of Examples 1 to 3 and Comparative Examples 1 to 4 were respectively used to treat the wastewater correspondingly. 3 inlet / outlet water samples were collected every day (at an interval of 8 hours), 3 parallel samples were taken for each detection, the average value was calculated, and it was continuously measured for 15 days. Finally, the average data of 15 days was taken 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 (%) Aureomycin 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 obtained from Table 1 above that the method of the present invention has a COD removal rate as high as 89% and a degradation rate of antibiotics such as aureomycin as high as 94%, breaking the bottleneck of "low biodegradability - low degradation efficiency". The B / C is increased from 0.15 to 0.45, converting the "difficult-to-biodegrade wastewater" into "easy-to-biodegrade wastewater", saving a large amount of energy consumption for the entire process. The biofilm thickness reaches 200μm, providing sufficient active sites for microorganisms, helping to achieve efficient electron transfer, and thus improving the treatment efficiency.

[0081] In order to further compare the effects of the present invention, a long-term stability test was carried out on the microbial enhanced water treatment method based on carbon fiber filler provided in Example 2. It was continuously operated for 6 months, and the COD, B / C, conductivity, and aureomycin degradation rate were detected every day. The biofilm state (thickness, color) was observed every week, and the resistivity of the filler 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 filler of the present invention

[0084] Monitoring index Test result COD removal rate Between 85 - 89% during the detection period B / C Increased from 0.15 and stabilized at 0.43 - 0.45 Aureomycin degradation rate Stabilized at 89 - 94% Packing resistivity Rose from 0.09 Ω·cm to 0.10 Ω·cm, with an increase of 11% Biofilm thickness The thickness was stabilized at 160 - 200 μm Packing integrity The anode and cathode modules had no damage or deformation within 6 months, the connection was firm, and the carbon fiber ropes had no loose breakage

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

[0086] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A microbial enhanced water treatment method based on carbon fiber fillers, characterized in that, It includes the following steps: S1. Install an anode carbon fiber module, a cathode floating module and an electrochemical workstation in the hydrolysis acidification tank, and connect the anode and the cathode to the electrochemical workstation with wires respectively to form a complete micro-current 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 packing is fixed in the fiberglass frame, and then each packing is connected in series with a graphite rope. The cathode floating module is located on the water surface of the hydrolysis acidification tank and presents a natural floating state; S2. Open the bottom point water distributor to evenly introduce the wastewater to be treated into the hydrolysis acidification tank; S3. Start the electrochemical workstation, set the operating voltage, form a micro-current environment between the anode carbon fiber module and the cathode floating module, monitor the effluent result, and discharge it after reaching the standard.

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

3. The microbial enhanced water treatment method based on carbon fiber filler according to claim 2, characterized in that, The preparation of the carbon fiber braided rope packing includes the following steps: (1) Oxidize 12k carbon fiber in an air atmosphere at 300-400°C for 1-2 h. At the same time, place the polyether ether ketone fiber in an ultrasonic cleaner, take it out and dry it after ultrasonic washing for 20-40 min, and then use a fiber carding machine to card the carbon fiber and the polyether ether ketone fiber for standby; (2) Mix the treated carbon fiber and polyether ether ketone fiber according to the mass ratio of (6-7):(3-4), and alternately braid the mixed fiber bundle and the fastening fiber through a 24-spindle high-speed braiding machine to obtain a carbon fiber braided rope; (3) Immerse the carbon fiber braided rope in the treatment liquid, soak it for 3-6 h, take it out and dry it in a vacuum drying oven for 3-4 h, then deposit a layer of nano-titanium dioxide coating on the surface of the carbon fiber braided rope by chemical vapor deposition method, and then place it in a high-temperature furnace for heat treatment for 1-2 h.

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

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

6. The microbial enhanced water treatment method based on carbon fiber filler according to claim 3, wherein During the chemical vapor deposition in step (3), control the reaction temperature at 400-500°C, the reaction time at 40-50 min, and the gas introduced is a mixed gas of tetrabutyl titanate vapor and oxygen, and the gas flow rates are 10-20 sccm and 50-100 sccm respectively.

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

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

9. The microbial enhanced water treatment method based on carbon fiber filler according to claim 1, characterized in that, Regularly aerate through the backwashing system to remove excessive biofilm and maintain the activity of the packing; the deodorization ventilation system provides oxygen for the cathode and replaces the air in the tank to ensure the electron transfer efficiency and the stable operation of the system.

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