A membrane bioreactor wastewater treatment process containing antifouling membrane

Abstract

The present invention provides a sewage treatment process using a membrane bioreactor containing an anti-fouling membrane, comprising the following steps: introducing sewage into an anoxic zone, aerating the bottom of the facultative anoxic zone through an aeration device, causing the sewage to undergo cyclic denitrification in the anoxic zone and the facultative anoxic zone, and filtering the sewage through a membrane bioreactor containing an anti-fouling membrane assembly and then flowing out. The anti-fouling membrane is a fiber fabric formed by cross-weaving modified composite fiber strips as warps and biological fibers as wefts. The composite fiber powder in the membrane can make the pore size denser and more uniform, and the membrane pore structure more reasonable. At the same time, the biological fibers have elastic properties and deform as wefts when impacted by water. However, due to the tension of the composite fiber strips, their pores are controlled, thereby achieving a high protein retention rate while enhancing water flux, and achieving better anti-fouling and antibacterial effects.

Description

Technical Field

[0001] The invention relates to the technical field of membrane bioreactor material sewage treatment process, in particular to a membrane bioreactor sewage treatment process containing an antifouling membrane. Background Art

[0002] Membrane technology is considered to be an efficient technology in the process of separation, purification and filtration. Due to its universal and coordinated performance, easy manufacturing and low cost-effectiveness, polymer membranes play an important role in membrane technology. However, the hydrophobic properties of polymer membranes often cause membrane fouling, which is a major obstacle for industrial production applications. Membrane fouling refers to the repeated contact between the membrane and the filtrate, and the pollutants in the filtrate are adsorbed and deposited on the membrane surface, causing pollutants such as proteins and colloids in the membrane pores to be adsorbed and deposited on the membrane surface or in the membrane pores, resulting in blockage of the membrane pores. It is not easy to clean, and the permeability of the membrane will gradually decline, affecting the practical life of the membrane.

[0003] Organic fouling refers to dissolved organic compounds in water, such as proteins, humus, and polysaccharides. Organic fouling is irreversible fouling in pressure-driven membranes. Natural organic matter is the primary organic contaminant in membrane treatment. Studies have shown that the hydrophobicity of natural organic matter is the primary cause of membrane flux decline, as it can adsorb on the membrane surface. The hydrophilicity of natural organic matter, however, has little effect on membrane fouling.

[0004] Colloidal contamination refers to the contamination of the membrane caused by colloids and particles with a size ranging from a few nanometers to a few microns, such as metal oxides, hydroxides, and organic colloids.

[0005] Biofouling refers to contamination caused by biologically active substances, such as microorganisms, fungi, viruses, and extracellular polymeric substances. Surface fouling of polymer membranes used in water treatment is common and often results in reduced treatment efficiency and increased costs. Because organisms can grow, proliferate, and migrate on the membrane surface, biofouling is more complex than other types of fouling. Membrane fouling is typically caused by the irreversible adhesion of one or more bacteria to the membrane surface. Over time, the initially attached bacteria form a biofilm. Summary of the Invention

[0006] In view of this, the present invention proposes a wastewater treatment process using a membrane bioreactor containing an anti-fouling membrane to solve the above problems.

[0007] The technical solution of the present invention is achieved as follows: a membrane bioreactor wastewater treatment process containing an antifouling membrane comprises the following steps: introducing wastewater into the anoxic zones of each level of reaction chamber, then aerating at the bottom of the facultative zone through an aeration device, so that the wastewater is circulated and denitrified in the anoxic zone and the facultative zone; after denitrification is completed, the wastewater is filtered through the membrane bioreactor containing the antifouling membrane assembly and then flows out.

[0008] Furthermore, the preparation of the antifouling film comprises the following steps:

[0009] S1. Modification of composite fiber strips: dissolving composite fiber powder in a calcium alginate solution having a concentration of 8-10 wt%, and then adding a spinning solvent in a volume ratio of the composite fiber solution to the spinning solvent of 3:0.1-0.3 to obtain a composite fiber liquid. After filtering, desulfurization, bleaching, acid washing and water washing, the modified composite fiber strips having a fiber fineness of 21.8-28.7 μm are obtained by extrusion through a spinneret, steam drawing, heat setting, and winding.

[0010] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 1-5:2-8:1;

[0011] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0012] S4. Prepare the solid base material: heat the solid base material until it melts, and allow the carrier to penetrate into the melted solid base material, so that a layer of nutrient matrix film is penetrated inside and outside the carrier, which is the anti-fouling film.

[0013] Furthermore, the composite fiber powder includes the following raw materials in parts by weight: 10-30 parts of partridge leaf powder, 8-15 parts of peacock arrowroot powder, 12-28 parts of loofah fiber, 19-25 parts of nano-silver fiber powder, 12-22 parts of ultrafine magnetic fiber, 8-12 parts of acetate fiber powder, and 3-8 parts of nano-crystalline cellulose. The partridge leaf powder and peacock arrowroot powder are obtained by drying and crushing fresh partridge leaves and peacock arrowroot.

[0014] Furthermore, the mass volume ratio of the composite fiber powder to the calcium alginate solution is 1:0.3-0.6 g / mL.

[0015] Furthermore, the spinning solvent is acetone and dichloromethane in a volume ratio of 1:2-3.

[0016] Furthermore, the solid base material in S3 is silicone rubber.

[0017] Furthermore, the antifouling membrane prepared by the method for preparing an antifouling membrane for a membrane bioreactor is used to prepare an antifouling membrane component in a membrane bioreactor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention introduces sewage into the anoxic zone, and then aerates the bottom of the facultative anoxic zone through an aeration device, so that the sewage is circulated and denitrified in the anoxic zone and the facultative anoxic zone, and the sewage is filtered by a membrane bioreactor containing an antifouling membrane component and then flows out. The antifouling membrane can achieve better antifouling and antibacterial effects by optimizing the carrier. The fiber fabric is cross-woven with modified composite fiber strips as warps and biological fibers as wefts. The composite fiber powder in the fabric can make the pore size denser and more uniform, and the membrane pore structure more reasonable. At the same time, the elastic properties of the biological fibers can deform as wefts when impacted by water. However, due to the tension of the composite fiber strips, the pores are controlled, thereby achieving a high protein retention rate while enhancing water flux, and achieving better antifouling and antibacterial effects. DETAILED DESCRIPTION

[0020] In order to better understand the technical content of the present invention, specific examples are provided below to further illustrate the present invention.

[0021] Unless otherwise specified, the experimental methods used in the examples of the present invention are all conventional methods.

[0022] Unless otherwise specified, the materials, reagents, etc. used in the examples of the present invention can be obtained from commercial sources.

[0023] Example 1

[0024] A wastewater treatment process using a membrane bioreactor containing an antifouling membrane comprises the following steps: introducing wastewater into the anoxic zones of each level of reaction chambers, aerating the bottom of the facultative anoxic zone through an aeration device, so that the wastewater undergoes cyclic denitrification in the anoxic zone and the facultative anoxic zone, and after denitrification is completed, filtering the wastewater through the membrane bioreactor containing the antifouling membrane assembly and then flowing out;

[0025] The preparation of the antifouling film comprises the following steps:

[0026] S1. Modification of composite fiber strips: After adding composite fiber powder into a calcium alginate solution with a concentration of 8wt% to dissolve it, the mass volume ratio of the composite fiber powder to the calcium alginate solution is 1:0.3 g / mL, and then adding a spinning solvent, the spinning solvent is acetone and dichloromethane with a volume ratio of 1:2, and the volume ratio of the composite fiber dissolving solution to the spinning solvent is 3:0.1, to obtain a composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam drawn, heat-set, and rolled to obtain a modified composite fiber strip with a fiber fineness of 21.8-28.7μm; the composite fiber powder includes the following raw materials in parts by weight: 10 parts of partridge leaf powder, 85 parts of peacock arrowroot powder, 12 parts of loofah fiber, 19 parts of nano silver fiber powder, 12 parts of ultrafine magnetic fiber, 8 parts of cellulose acetate powder, and 3 parts of nanocrystalline cellulose;

[0027] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 1:2:1;

[0028] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0029] S4. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0030] Example 2

[0031] A wastewater treatment process using a membrane bioreactor containing an antifouling membrane comprises the following steps: introducing wastewater into the anoxic zones of each level of reaction chambers, aerating the bottom of the facultative anoxic zone through an aeration device, so that the wastewater undergoes cyclic denitrification in the anoxic zone and the facultative anoxic zone, and after denitrification is completed, filtering the wastewater through the membrane bioreactor containing the antifouling membrane assembly and then flowing out;

[0032] The preparation of the antifouling film comprises the following steps:

[0033] S1. Modification of composite fiber strips: after dissolving composite fiber powder in a 10wt% calcium alginate solution, the mass volume ratio of composite fiber powder to calcium alginate solution is 1:0.6 g / mL, and then a spinning solvent is added, the spinning solvent is acetone and dichloromethane in a volume ratio of 1:3, and the volume ratio of composite fiber dissolving solution to spinning solvent is 3:0.3, to obtain a composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam drawn, heat-set, and rolled to obtain a modified composite fiber strip with a fiber fineness of 21.8 to 28.7 μm; the composite fiber powder includes the following raw materials in parts by weight: 30 parts of partridge leaf powder, 15 parts of peacock arrowroot powder, 28 parts of loofah fiber, 25 parts of nano silver fiber powder, 22 parts of ultrafine magnetic fiber, 12 parts of cellulose acetate powder, and 8 parts of nanocrystalline cellulose;

[0034] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 5:8:1;

[0035] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0036] S4. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0037] Example 3

[0038] A wastewater treatment process using a membrane bioreactor containing an antifouling membrane comprises the following steps: introducing wastewater into the anoxic zones of each level of reaction chambers, aerating the bottom of the facultative anoxic zone through an aeration device, so that the wastewater undergoes cyclic denitrification in the anoxic zone and the facultative anoxic zone, and after denitrification is completed, filtering the wastewater through the membrane bioreactor containing the antifouling membrane assembly and then flowing out;

[0039] The preparation of the antifouling film comprises the following steps:

[0040] S1. Modification of composite fiber strips: after dissolving composite fiber powder in a 9wt% calcium alginate solution, the mass volume ratio of composite fiber powder to calcium alginate solution is 1:0.5 g / mL, and then a spinning solvent is added, the spinning solvent is acetone and dichloromethane in a volume ratio of 1:2.5, and the volume ratio of composite fiber dissolving solution to spinning solvent is 3:0.2, to obtain a composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam drawn, heat-set, and rolled to obtain a modified composite fiber strip with a fiber fineness of 21.8-28.7μm; the composite fiber powder includes the following raw materials in parts by weight: 20 parts of partridge leaf powder, 12 parts of peacock arrowroot powder, 20 parts of loofah fiber, 22 parts of nano silver fiber powder, 17 parts of ultrafine magnetic fiber, 10 parts of cellulose acetate powder, and 5 parts of nanocrystalline cellulose;

[0041] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 3:5:1;

[0042] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0043] S4. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0044] Example 4

[0045] The difference between this embodiment and embodiment 3 is that the composite fiber powder includes the following raw materials in parts by weight: 20 parts of partridge leaf powder, 5 parts of peacock arrowroot powder, 10 parts of loofah fiber, 15 parts of nano silver fiber powder, 30 parts of ultrafine magnetic fiber, 5 parts of acetate fiber powder, and 15 parts of nanocrystalline cellulose.

[0046] Specifically, a membrane bioreactor wastewater treatment process containing an antifouling membrane, wherein the preparation of the antifouling membrane comprises the following steps:

[0047] S1. Modification of composite fiber strips: after adding composite fiber powder into calcium alginate solution with a concentration of 9wt% to dissolve it, the mass volume ratio of composite fiber powder to calcium alginate solution is 1:0.5 g / mL, and then adding spinning solvent, the spinning solvent is acetone and dichloromethane with a volume ratio of 1:2.5, and the volume ratio of composite fiber dissolving solution to spinning solvent is 3:0.2, to obtain composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam drawn, heat-set, and rolled to obtain modified composite fiber strips with a fiber fineness of 21.8-28.7μm; the composite fiber powder includes the following raw materials in parts by weight: 20 parts of partridge leaf powder, 5 parts of peacock arrowroot powder, 10 parts of loofah fiber, 15 parts of nano silver fiber powder, 30 parts of ultrafine magnetic fiber, 5 parts of cellulose acetate powder, and 15 parts of nanocrystalline cellulose;

[0048] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 3:5:1;

[0049] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0050] S4. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0051] Example 5

[0052] The difference between this embodiment and embodiment 3 is that the biological fiber of S1 is a mixture of sea silk fiber, milk protein fiber and spider silk fiber in a mass ratio of 1:1:1.

[0053] Specifically, a membrane bioreactor wastewater treatment process containing an antifouling membrane, wherein the preparation of the antifouling membrane comprises the following steps:

[0054] S1. Modification of composite fiber strips: after dissolving composite fiber powder in a 9wt% calcium alginate solution, the mass volume ratio of composite fiber powder to calcium alginate solution is 1:0.5 g / mL, and then a spinning solvent is added, the spinning solvent is acetone and dichloromethane in a volume ratio of 1:2.5, and the volume ratio of composite fiber dissolving solution to spinning solvent is 3:0.2, to obtain a composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam drawn, heat-set, and rolled to obtain a modified composite fiber strip with a fiber fineness of 21.8-28.7μm; the composite fiber powder includes the following raw materials in parts by weight: 20 parts of partridge leaf powder, 12 parts of peacock arrowroot powder, 20 parts of loofah fiber, 22 parts of nano silver fiber powder, 17 parts of ultrafine magnetic fiber, 10 parts of cellulose acetate powder, and 5 parts of nanocrystalline cellulose;

[0055] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 1:1:1;

[0056] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0057] S4. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0058] 1. Membrane permeability test:

[0059] (1) Water flux test:

[0060] The antifouling membranes prepared in Examples 1-5 were cut and placed in a paper ultrafiltration cup. The effective area of the membrane during filtration was 15.25 cm 2 , inject deionized water into the upper part of the ultrafiltration cup, introduce nitrogen, the pressure is 0.3MPa, and perform water flux test for 10min at a water temperature of 25℃. The volume of pure water passing through the membrane is calculated as follows:

[0061]

[0062] Where W is the measured membrane pure water flux (L / (m 2 h));

[0063] V--the volume of pure water measured (L);

[0064] S--effective area ((m 2 );

[0065] △t--time used for filtration (h).

[0066] (2) Protein retention test:

[0067] Determination of membrane retention rate: Prepare a BSA solution with a mass concentration of 1000 mg / L, ultrafilter at 0.1 MPa, take samples at regular intervals, measure the absorbance of the original solution and filtrate at 280 nm, obtain the corresponding concentration based on the standard curve, and calculate the retention rate R.

[0068] R = (ρ0 - ρ1) / ρ0 × 100%.

[0069] Where ρ0 is the mass concentration of the original solution; ρ1 is the mass concentration of the ultrafiltrate.

[0070] 2. Test of membrane antifouling effect:

[0071] (1) The antifouling membranes prepared in Examples 1 to 5 above were used in the membrane units of a membrane bioreactor, and were divided into five experimental groups, each with three test samples. The test samples were cut into rectangular parallelepipeds with a size of 80 mm × 20 mm × 5 mm.

[0072] (2) Take polluted river water and pour it into the water tank of the water circulation system. The water flow rate of the system is set at 1.0-1.5m / s and circulates continuously. After 3 days, take out the test samples for observation and analysis, and perform OD 600 The absorbance value was measured to quantitatively compare and analyze the antifouling effect of each test sample. 600 The value is linearly related to the concentration of bacterial cells in the solution. The more bacterial cells there are in the solution and the higher the concentration, the greater the optical density of the bacterial cells absorbing light of a specific wavelength, and the greater the OD value, and vice versa.

[0073] 3. Test results:

[0074]

[0075] Note: The above data are average values

[0076] As can be seen from the results in the above table, the present invention optimizes the carrier and uses modified composite fiber strips as warp and biological fiber as weft to cross-weave the fiber fabric, which enhances water flux while achieving a high protein retention rate and can efficiently adsorb bacteria in the solution;

[0077] The water flux of Examples 1-3 after treatment is significantly increased compared with that of Example 4, indicating that the hydrophilic groups account for a large proportion of the surface area of the carrier, and are subject to greater attraction from water, while the hydrophobic part is subject to less resistance. When the hydrophilic groups carry water to the surface, they can migrate to the surface faster, which also allows the hydrophilic groups to migrate to the surface as much as possible, and the porosity OD of the antifouling membrane is 600 The value is significantly reduced, and selecting specific composite fiber powder in proportion can achieve better antifouling and antibacterial effects.

[0078] In Examples 1-3 and Example 5, the ratios of the biological fibers are adjusted, and a specific ratio is selected to synergistically play an anti-fouling role. From the test results, by adjusting the ratios of the composite fiber powders and biological fibers and optimizing the preparation process parameters of the composite fiber strips, Example 3 has the best anti-fouling and antibacterial effect.

[0079] A comparative experiment was conducted on the processing method of the above-mentioned preferred embodiment 3, as follows:

[0080] Comparative Example 1

[0081] The difference between this comparative example and Example 3 is that the composite fiber strips are not modified. Specifically, this comparative example is a wastewater treatment process using a membrane bioreactor containing an antifouling membrane. The preparation of the antifouling membrane includes the following steps:

[0082] S1. Modification of composite fiber strips: adding composite fiber powder to a spinning solvent, wherein the spinning solvent is acetone and dichloromethane in a volume ratio of 1:2.5, and the volume ratio of the composite fiber dissolving solution to the spinning solvent is 3:0.2, to obtain a composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam-drawn, heat-set, and rolled to obtain a composite fiber strip with a fiber fineness of 21.8 to 28.7 μm; the composite fiber powder comprises the following raw materials in parts by weight: 20 parts of partridge leaf powder, 12 parts of peacock arrowroot powder, 20 parts of loofah fiber, 22 parts of nano silver fiber powder, 17 parts of ultrafine magnetic fiber, 10 parts of cellulose acetate powder, and 5 parts of nanocrystalline cellulose;

[0083] S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 3:5:1;

[0084] S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist;

[0085] S4. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0086] Comparative Example 2

[0087] The difference between this comparative example and Example 3 is that both the warp and weft are modified composite fiber strips. Specifically, this is a membrane bioreactor wastewater treatment process containing an antifouling membrane. The preparation of the antifouling membrane includes the following steps:

[0088] S1. Modification of composite fiber strips: after dissolving composite fiber powder in a 9wt% calcium alginate solution, the mass volume ratio of composite fiber powder to calcium alginate solution is 1:0.5 g / mL, and then a spinning solvent is added, the spinning solvent is acetone and dichloromethane in a volume ratio of 1:2.5, and the volume ratio of composite fiber dissolving solution to spinning solvent is 3:0.2, to obtain a composite fiber liquid, which is filtered, desulfurized, bleached, pickled and washed, and then extruded through a spinneret, steam drawn, heat-set, and rolled to obtain a modified composite fiber strip with a fiber fineness of 21.8-28.7μm; the composite fiber powder includes the following raw materials in parts by weight: 20 parts of partridge leaf powder, 12 parts of peacock arrowroot powder, 20 parts of loofah fiber, 22 parts of nano silver fiber powder, 17 parts of ultrafine magnetic fiber, 10 parts of cellulose acetate powder, and 5 parts of nanocrystalline cellulose;

[0089] S2. Carrier preparation: The modified composite fiber strips are used as warp and weft respectively, and the fiber fabric is cross-woven, wherein the warp and weft are arranged alternately with forward twist and reverse twist;

[0090] S3. Prepare the solid base material: Heat the silicone rubber until it melts, and allow the carrier to penetrate into the melted silicone rubber, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, which is the anti-fouling film.

[0091] Comparative Example 3

[0092] The difference between this comparative example and Example 3 is that the biological fibers are milk protein fibers and spider silk fibers in a 1:1 ratio.

[0093] The treated antifouling membranes of Comparative Examples 1-3 were tested according to the above membrane performance test method, and the test results are as follows:

[0094]

[0095] From the comparative test results, it can be seen that the modified composite fiber strips have better antifouling performance than the unmodified composite fiber strips due to the adjustment of the warp and weft fibers of the carrier. The composite fiber powder can make the pore size denser and more uniform, and the membrane pore structure more reasonable. However, the elastic properties of the biological fiber will deform as the weft when subjected to water impact. However, due to the tension of the composite fiber strips, its pores are controlled, thereby enhancing the water flux and retention rate, effectively targeting protein retention, OD 600 The value is significantly lower than that of the control example, and the product has strong antifouling and antibacterial ability.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wastewater treatment process using a membrane bioreactor containing an antifouling membrane, characterized in that: The following steps are involved: Sewage is introduced into the anoxic zone of each level of reaction chamber, and then aerated at the bottom of the facultative zone through the aeration device, so that the sewage is circulated and denitrified in the anoxic zone and the facultative zone. After the denitrification is completed, the sewage is filtered through the membrane bioreactor containing the anti-fouling membrane component and then flows out; The preparation of the antifouling film comprises the following steps: S1. Modification of composite fiber strips: dissolving composite fiber powder in a calcium alginate solution having a concentration of 8-10 wt%, and then adding a spinning solvent in a volume ratio of the composite fiber solution to the spinning solvent of 3:0.1-0.3 to obtain a composite fiber liquid. After filtering, desulfurization, bleaching, acid washing and water washing, the modified composite fiber strips having a fiber fineness of 21.8-28.7 μm are obtained by extrusion through a spinneret, steam drawing, heat setting, and winding. S2, biofiber: prepared from a mixture of sea silk fiber, milk protein fiber, and spider silk fiber in a mass ratio of 1-5:2-8:1; S3. Carrier preparation: a fiber fabric is prepared by cross-weaving the modified composite fiber strips as warp and the biological fiber as weft, wherein both the warp and weft are arranged alternately with forward twist and reverse twist; S4, preparing a solid base material: heating the solid base material until it melts, allowing the carrier to penetrate the melted solid base material, so that a layer of nutrient matrix film is infiltrated inside and outside the carrier, that is, the antifouling film; The composite fiber powder comprises the following raw materials in parts by weight: 10-30 parts of partridge leaf powder, 8-15 parts of peacock arrowroot powder, 12-28 parts of loofah fiber, 19-25 parts of nano silver fiber powder, 12-22 parts of ultrafine magnetic fiber, 8-12 parts of acetate fiber powder, and 3-8 parts of nano crystalline cellulose.

2. The wastewater treatment process using a membrane bioreactor comprising an antifouling membrane according to claim 1, wherein: The mass volume ratio of the composite fiber powder and the calcium alginate solution in S1 is 1:0.3-0.6 g / mL.

3. The wastewater treatment process using a membrane bioreactor comprising an antifouling membrane according to claim 1, wherein: The spinning solvent in S1 is acetone and dichloromethane in a volume ratio of 1:2-3.

4. The wastewater treatment process using a membrane bioreactor comprising an antifouling membrane according to claim 1, wherein: The solid base material in S4 is silicone rubber.

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