A process for treating wastewater from the production of nonwoven fabrics

Abstract

The application discloses a kind of spray weaving wastewater zero discharge treatment processes, belong to spray weaving wastewater treatment field.It specifically includes the following steps: S1: spray weaving wastewater is transported into adjusting pool, homogenization is carried out in adjusting pool, then pH is adjusted, coagulant is added to be fully coagulated, filtration;S2: wastewater after being treated in S1 is passed into filter pool including filter layer, and filtration is carried out, and the filter material in the filter layer includes modified gelatin biomembrane carrier and volcanic rock;S3: wastewater after being treated in S2 is mixed with ozone and enters oxidation tower filled with catalytic filler, and is treated by oxidation;S4: wastewater after being treated by oxidation in S3 removes metal ions by electrodialysis, and after treatment, it can flow back to spray water loom for reuse.The spray weaving wastewater zero discharge treatment process provided by the application has good effects of reducing COD and SS in wastewater, and wastewater and treated substances are all recycled, zero emission, which is beneficial to environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment for spun textiles, and specifically relates to a zero-discharge treatment process for spun textile wastewater. Background Technology

[0002] Water jet looms are among the most widely used weaving equipment in my country's textile industry, boasting advantages such as high output, good quality, and low weaving costs. However, they consume large quantities of high-quality tap water. Furthermore, to improve the smoothness and abrasion resistance of the warp yarns during weaving, suitable sizing agents are required, primarily chemical and starch-based agents. The use of these sizing agents results in high COD and SS levels in the effluent. If the wastewater from water jet looms is not effectively treated and recycled, it will lead to significant water pollution and resource waste.

[0003] Publication number CN104045178 Patent application A discloses a method for treating and reusing wastewater from water-jet looms. This application employs a method of "oil separation + coal slag adsorption + coagulation sedimentation + air flotation + mechanical filtration + reuse." The wastewater from the water-jet looms enters a bar screen, an oil separator, and a discharge-type coal slag oil suction device for oil separation pretreatment. It then flows by gravity into a homogenization tank, is pumped up, and sodium hydroxide, polyaluminum chloride, and polyacrylamide are added to three sets of pipeline mixers respectively. The wastewater is then sent to a coagulation sedimentation device and a high-efficiency air flotation device for physicochemical treatment. The effluent flows by gravity into an intermediate water tank, and is then pumped up to a multi-media filter, a microfilter, and a security filter for physical treatment. The effluent flows by gravity into a reuse clear water tank and is pumped back to the water-jet looms for recycling. The separated floating oil, particulate colloids, and impurities can be mixed into coal for boiler incineration. The physicochemically treated floating sludge, physicochemically treated sediment, and flushing water are collected and flow by gravity into a sludge thickening tank, and then pumped to a sludge dewatering machine for dewatering. The recycling rate of the water-jet loom wastewater treatment can reach over 95%. However, this wastewater treatment method has a complex process flow, and water quality indicators such as conductivity and hardness are not easy to control. The disposal of the generated physicochemical sludge and oily substances has not been considered. If not disposed of properly, it will cause secondary pollution to the environment. Summary of the Invention

[0004] The purpose of this invention is to provide a zero-discharge treatment process for spun-weaving wastewater to solve the problem of low recycling rate of spun-weaving wastewater.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A zero-discharge treatment process for wastewater from textile spraying, such as Figure 1 As shown, it includes the following steps:

[0007] S1: Spray weaving wastewater is transported into the equalization tank, where it is homogenized and equalized in volume. Then, the pH is adjusted, coagulant is added for thorough coagulation, and then the wastewater is filtered.

[0008] S2: The wastewater treated by S1 is passed into a filter tank including a filter media layer for filtration. The filter media phase in the filter media layer includes a modified gelatin biofilm carrier and volcanic rock.

[0009] S3: The wastewater treated by S2 is mixed with ozone and enters an oxidation tower filled with catalytic packing for oxidation treatment;

[0010] S4: Wastewater treated by S3 oxidation is treated by electrodialysis to remove metal ions, and then it can be returned to the water jet loom for reuse.

[0011] Furthermore, the ozone consumed in S3 is recovered from the top of the oxidation tower and fed into the S1 equalization tank, and then recovered from the S1 equalization tank and fed into the S2 filtration tank.

[0012] Furthermore, the wastewater has a COD of 300–400 mg / L and an SS of 100–150 mg / L; the ratio of polyaluminum sulfate, polyacrylamide, and wastewater is 50–100 mg: 10–20 mg: 1 L.

[0013] Furthermore, the coagulant is polyaluminum sulfate and polyacrylamide; the ratio of polyaluminum sulfate, polyacrylamide and wastewater is 50-100 mg: 10-20 mg: 1 L.

[0014] Furthermore, the mass ratio of the modified gelatin biofilm carrier to volcanic rock is 1:1.

[0015] Furthermore, the total amount of concentrated water and electrodialysis water produced by the electrodialysis method is mixed with sanitary water and then used in the sanitary water system.

[0016] Furthermore, the catalytic packing material includes a heterogeneous catalyst, which is one or a combination of several of the following: iron tetroxide, manganese dioxide, aluminum oxide, copper oxide, cobalt oxide, magnesium oxide, zinc oxide, and nickel oxide.

[0017] When wastewater passes through the filter media layer, it continuously comes into contact with the filter media, allowing microorganisms to multiply on the surface and form a biofilm. The biofilm is a biological community structure composed of various microorganisms and microorganisms. A thin layer of wastewater, called "attached water," is always adsorbed onto the surface of the biofilm, while the outer layer is free-flowing wastewater, called "moving water." When organic matter in the attached water is adsorbed and oxidized by the microorganisms in the biofilm, the concentration of organic matter in the attached water layer decreases, while the concentration in the moving water layer remains high, thus a mass transfer process occurs. Organic matter in the wastewater is continuously transferred in and decomposed by the microorganisms. The oxygen consumed by the microorganisms enters the biofilm along the air, the moving water layer, and the attached water layer; inorganic substances and CO2 produced by the decomposition of organic matter by the microorganisms are released in the opposite direction. The wastewater is purified in this process.

[0018] Furthermore, the modified gelatin biofilm carrier is prepared through the following steps:

[0019] Gelatin and an anhydride containing double bonds were dissolved in a slow-release PBS solution at pH 7.5 and reacted at 45–60 °C for 6–8 h. The mixture was then freeze-dried to obtain acylated modified gelatin. Acylated modified gelatin, chitosan, and a photoinitiator were added to deionized water and frozen at -20–-10 °C for 12–20 h. The mixture was then irradiated under ultraviolet light and finally freeze-dried for 1–2 days to obtain a modified gelatin biofilm carrier.

[0020] Furthermore, the ratio of gelatin, modifier, and PBS buffer solution is 1–1.1 g: 0.06–0.08 g: 25–30 mL; the ratio of acylated modified gelatin, chitosan, photoinitiator, and deionized water is 1–1.1 g: 0.2 g–0.4 g: 0.1–0.15 g: 35–40 mL.

[0021] Furthermore, the intensity of the ultraviolet light is 80–100 mW / cm². 2 The irradiation time is 15-20 minutes.

[0022] Furthermore, the modifier is one of methacrylic anhydride and angelic anhydride; the photoinitiator is one of 2-hydroxymethylphenylacetone and benzoin.

[0023] The beneficial effects of this invention are:

[0024] (1) The present invention employs a zero-discharge treatment process for textile wastewater, applying ozone purification technology to treat textile wastewater. Ozone is first introduced into an oxidation tower, where a heterogeneous catalyst reduces COD remaining untreated by biocatalysis, while also providing sterilization. The unreacted ozone is then introduced into an equalization tank, where it consumes some COD, reducing biodegradation pressure. Furthermore, the oxygen produced by ozone oxidation is introduced into a filtration tank, where the oxygen-rich environment promotes the growth of aerobic bacteria and improves degradation efficiency. Appropriate concentrations of calcium and magnesium ions can even promote microbial growth and reproduction. This invention achieves full utilization of ozone and minimizes energy consumption, resulting in zero emissions.

[0025] (2) The modified gelatin biofilm carrier used in this invention is mixed with volcanic rock as filter material. Both have a porous structure that can provide a good living environment for microorganisms and adsorb calcium and magnesium ions in wastewater. The modified gelatin biofilm carrier has the characteristics of non-biotoxicity and biodegradability. The biofilm carrier prepared with gelatin has a porous structure, and it and its degradation products can serve as carbon and nitrogen sources for the growth and reproduction of microorganisms. The added chitosan adsorbs calcium and magnesium ions and provides nutrients for microorganisms. However, due to its soft texture, it is easy to accumulate and deform in practical applications. Mixing it with volcanic rock can maintain the stability of the filter material. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the zero-discharge treatment process for wastewater from the spray weaving industry according to the present invention. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment provides a zero-discharge treatment process for wastewater from weaving, including the following steps:

[0031] First, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution (pH 7.5) and reacted at 45 °C for 8 h. The mixture was then freeze-dried to obtain acylated modified gelatin. 1 g of acylated modified gelatin, 0.2 g of chitosan, and 0.1 g of 2-hydroxymethylphenylacetone were added to 40 mL of deionized water and frozen at -20 to -10 °C for 20 h. Afterward, the mixture was irradiated under ultraviolet light at an intensity of 100 mW / cm². 2 The irradiation time was 15 min, and the product was freeze-dried for 2 days to obtain a modified gelatin biofilm carrier with a porous structure.

[0032] The second step involves transporting the sprayed textile wastewater into an equalization tank, where it undergoes homogenization, quantity equalization, and pH adjustment. Then, the equalization tank is pumped into an air flotation device containing 60 mg / L of polyaluminum sulfate and 10 mg / L of polyacrylamide for thorough coagulation, removing some oil and suspended solids.

[0033] The third step involves filtering the wastewater treated in the second step through the inlet into a filter tank containing a filter media layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1).

[0034] The fourth step involves mixing the wastewater treated in the third step with ozone and then feeding it into an oxidation tower filled with catalytic packing material (including a mixed catalyst of iron tetroxide and manganese dioxide). After the ozone is consumed, it is recovered from the top of the oxidation tower and fed into an equalization tank, and then recovered from the equalization tank and fed into a filtration tank.

[0035] Step 5: The wastewater treated in step 4 is treated by electrodialysis to remove metal ions. After treatment, it can be returned to the water jet loom for reuse. At the same time, the concentrated water and electrodialysis water produced by electrodialysis are mixed with sanitary water (volume ratio of at least 1:1) and used in the air conditioning water system or sanitary water system.

[0036] The above steps are as follows Figure 1 As shown: the wastewater from water jet looms is treated sequentially through an equalization tank, a filtration tank, an oxidation tower, and an electrodialysis step. After treatment by electrodialysis, the wastewater can be directly used on the water jet looms. The concentrated water and electrodialysis water produced by electrodialysis are mixed with sanitary water and used in the sanitary water system.

[0037] Ozone is introduced from the bottom of the oxidation tower, where it undergoes oxidation to reduce the COD value of the wastewater. Low-concentration ozone is recovered from the top of the oxidation tower and then introduced into the equalization tank. After further reducing the COD of the wastewater by a certain amount, the resulting oxygen-rich gas is introduced into the filtration tank. This oxygen-rich gas promotes the growth and reproduction of microorganisms, thereby improving the efficiency of microbial degradation.

[0038] Example 2

[0039] The difference between this embodiment and Embodiment 1 is that "0.2g chitosan" in the first step is changed to "0.4g chitosan".

[0040] The remaining raw materials and preparation process are the same as in Example 1.

[0041] Example 3

[0042] The difference between this embodiment and Example 1 is that in the second step, "60 mg / L of polyaluminum sulfate and 10 mg / L of polyacrylamide" is changed to "100 mg / L of polyaluminum sulfate and 20 mg / L of polyacrylamide".

[0043] The remaining raw materials and preparation process are the same as in Example 1.

[0044] Example 4

[0045] The difference between this embodiment and Embodiment 1 is that the direction of ozone introduction in steps two through four is changed. The specific implementation steps are as follows:

[0046] The second step involves transporting the sprayed textile wastewater into an equalization tank, where it undergoes homogenization, quantity equalization, and pH adjustment. Then, the equalization tank is pumped into an air flotation device containing 60 mg / L of polyaluminum sulfate and 10 mg / L of polyacrylamide for thorough coagulation, removing some oil and suspended solids.

[0047] The third step involves filtering the wastewater treated in the second step through the inlet into a filter tank containing a filter media layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1).

[0048] The fourth step involves mixing the wastewater treated in the third step with ozone and then feeding it into an oxidation tower filled with catalytic packing material (including a mixed catalyst of iron tetroxide and manganese dioxide). After the ozone is consumed, it is recovered from the top of the oxidation tower and fed into a filtration tank.

[0049] The remaining raw materials and preparation process are the same as in Example 1.

[0050] Example 5

[0051] First, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution (pH 7.5) and reacted at 45 °C for 8 h. The mixture was then freeze-dried to obtain acylated modified gelatin. 1 g of acylated modified gelatin, 0.2 g of chitosan, and 0.1 g of 2-hydroxymethylphenylacetone were added to 40 mL of deionized water and frozen at -20 to -10 °C for 20 h. Afterward, the mixture was irradiated under ultraviolet light at an intensity of 100 mW / cm². 2 The irradiation time was 15 min, and the product was freeze-dried for 2 days to obtain a modified gelatin biofilm carrier with a porous structure.

[0052] The second step involves transporting the sprayed textile wastewater into an equalization tank, where it undergoes homogenization, quantity equalization, and pH adjustment. Then, the equalization tank is pumped into an air flotation device containing 60 mg / L of polyaluminum sulfate and 10 mg / L of polyacrylamide for thorough coagulation, removing some oil and suspended solids.

[0053] The third step involves filtering the wastewater treated in the second step through the inlet into a filter tank containing a filter media layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1).

[0054] The fourth step involves mixing the wastewater treated in the third step with ozone and then introducing it into an oxidation tower filled with catalytic packing material (including a mixed catalyst of iron tetroxide and manganese dioxide).

[0055] Step 5: The wastewater treated in step 4 is treated by electrodialysis to remove metal ions. After treatment, it can be returned to the water jet loom for reuse. At the same time, the concentrated water and electrodialysis water produced by electrodialysis are mixed with sanitary water (volume ratio of at least 1:1) and used in the air conditioning water system or sanitary water system.

[0056] Comparative Example 1

[0057] The difference between this comparative example and Example 1 is that chitosan is not added in the first step. The specific implementation steps are as follows:

[0058] First, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution (pH 7.5) and reacted at 45 °C for 8 h. The mixture was then freeze-dried to obtain acylated modified gelatin. 1 g of the acylated modified gelatin and 0.1 g of 2-hydroxymethylphenylacetone were added to 40 mL of deionized water and frozen at -20 to -10 °C for 20 h. Afterward, the mixture was irradiated under ultraviolet light at an intensity of 100 mW / cm². 2 The irradiation time was 15 min, and the product was freeze-dried for 2 days to obtain a modified gelatin biofilm carrier with a porous structure.

[0059] The remaining raw materials and preparation process are the same as in Example 1.

[0060] Comparative Example 2

[0061] Compared with Example 1, the difference in this comparative example is that in the third step, "filter layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1)" is replaced with "filter layer (polypropylene: volcanic rock mass ratio of 1:1)".

[0062] The remaining raw materials and preparation process are the same as in Example 1.

[0063] Comparative Example 3

[0064] Compared with Example 1, the difference in this comparative example is that in the third step, "filter media layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1)" is replaced with "filter media layer (volcanic rock)".

[0065] The remaining raw materials and preparation process are the same as in Example 1.

[0066] Comparative Example 4

[0067] The first step is to transport the sprayed textile wastewater into the equalization tank, where it is homogenized, equalized in volume and pH adjusted. Then, the equalization tank lift pump pumps the wastewater into an air flotation device containing 60 mg / L polyaluminum sulfate and 10 mg / L polyacrylamide for thorough coagulation, removing some oil and suspended solids.

[0068] The second step involves mixing the wastewater treated in the first step with ozone and then feeding it into an oxidation tower filled with catalytic packing material (including a mixed catalyst of iron tetroxide and manganese dioxide). After the ozone is consumed, it is recovered from the top of the oxidation tower and fed into an equalization tank.

[0069] Step 3: The wastewater treated in step 2 is then treated by electrodialysis to remove metal ions.

[0070] Comparative Example 5

[0071] First, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution (pH 7.5) and reacted at 45 °C for 8 h. The mixture was then freeze-dried to obtain acylated modified gelatin. 1 g of acylated modified gelatin, 0.2 g of chitosan, and 0.1 g of 2-hydroxymethylphenylacetone were added to 40 mL of deionized water and frozen at -20 to -10 °C for 20 h. Afterward, the mixture was irradiated under ultraviolet light at an intensity of 100 mW / cm². 2 The irradiation time was 15 min, and the product was freeze-dried for 2 days to obtain a modified gelatin biofilm carrier with a porous structure.

[0072] The second step involves transporting the sprayed textile wastewater into an equalization tank, where it undergoes homogenization, quantity equalization, and pH adjustment. Then, the equalization tank is pumped into an air flotation device containing 60 mg / L of polyaluminum sulfate and 10 mg / L of polyacrylamide for thorough coagulation, removing some oil and suspended solids.

[0073] The third step involves filtering the wastewater treated in the second step through the inlet into a filter tank containing a filter media layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1).

[0074] Step 4: The wastewater treated in step 3 is then treated by electrodialysis to remove metal ions.

[0075] Comparative Example 6

[0076] This comparative test measures the amount of polyaluminum sulfate and polyacrylamide required to achieve the acceptable SS content without filtration in a filter bed.

[0077] The remaining raw materials and preparation process are the same as in Example 1.

[0078] Performance tests were conducted on Examples 1-5 and Comparative Examples 1-6, and the wastewater COD was 326 mg / L, SS was 121 mg / L, and conductivity was 603 μs / cm.

[0079] According to the "Methods for Monitoring and Analysis of Water and Wastewater" issued by the State Environmental Protection Administration of China, the water quality of each embodiment and comparative example of this application was monitored:

[0080] The results are shown in Table 1:

[0081] Table 1

[0082]

[0083] The required amounts of polyaluminum sulfate and polyacrylamide to achieve the acceptable SS content without filtration are shown in Table 2.

[0084] Table 2

[0085]

[0086] As can be seen from Table 1, the only difference between Examples 2 and 3 and Example 1 is the change in the amount of raw materials added within a reasonable implementation range, which has little impact on the final result. Compared with Example 1, Example 4 changed the circulation path of ozone. Directly introducing air containing a portion of ozone into the filter tank will reduce the activity of microorganisms and reduce the effect of microorganisms in removing organic matter from water. Compared with Example 1, in Example 5, ozone is not recovered after oxidation treatment, which reduces the COD treatment efficiency and the utilization rate of ozone is also reduced.

[0087] Compared to Example 1, Comparative Example 1 mainly showed an increase in conductivity. This is because chitosan can not only serve as a nutrient for microbial growth and reproduction but also effectively adsorb calcium and magnesium ions in water. Compared to Example 1, while polypropylene is also a good biofilm carrier, it is a non-degradable organic material that is difficult to decompose and can cause plastic pollution. The modified gelatin biofilm carrier prepared in this invention enables microbial attachment and provides nutrients, and the material is environmentally friendly and does not cause secondary pollution. In Comparative Example 3, relying solely on volcanic rock as a biofilm carrier, the conductivity of C in wastewater... The removal effect of OD is not ideal; in Comparative Example 4, the wastewater was not filtered, resulting in a worse purification effect on the textile wastewater; the difference between Comparative Example 5 and the Example is that ozone was not introduced. Ozone plays a crucial role in the entire system. On the one hand, it reduces the COD that was not completely treated by biocatalysis under the action of heterogeneous catalyst, and on the other hand, it also plays a role in sterilization and disinfection. In this case, the unreacted ozone is introduced into the equalization tank. On the one hand, it consumes some COD and reduces the biodegradation pressure. On the other hand, the ozone is oxidized and reacted into oxygen, which is introduced into the filter tank. The oxygen-rich environment promotes the growth of aerobic bacteria and improves the degradation efficiency.

[0088] As shown in Table 2, in Comparative Example 6, achieving the qualified SS content without filtration requires 250 mg / L polyaluminum sulfate and 60 mg / L polyacrylamide. This not only increases the cost of the reagents but also increases the conductivity of the wastewater, thus increasing the pressure on electrodialysis to remove metal ions.

[0089] In summary, the zero-discharge treatment process for textile wastewater provided by this invention effectively reduces COD and SS in the wastewater, lowers the conductivity of the wastewater, and allows for the complete recycling of wastewater and treated materials, resulting in zero discharge and thus benefiting environmental protection.

[0090] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0091] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A zero-discharge treatment process for wastewater from jet weaving, characterized in that, Includes the following steps: S1: Spray weaving wastewater is transported into the equalization tank, where it is homogenized and equalized in volume. Then, the pH is adjusted, coagulant is added for thorough coagulation, and then the wastewater is filtered. S2: The wastewater treated by S1 is passed into a filter tank including a filter media layer for filtration. The filter media phase in the filter media layer includes a modified gelatin biofilm carrier and volcanic rock. S3: The wastewater treated by S2 is mixed with ozone and enters an oxidation tower filled with catalytic packing for oxidation treatment; S4: Wastewater treated by S3 oxidation is treated by electrodialysis to remove metal ions, and then it can be returned to the water jet loom for reuse. After the ozone in S3 is consumed, it is recovered from the top of the oxidation tower and fed into the S1 conditioning tank, and then recovered from the S1 conditioning tank and fed into the S2 filtration tank; the catalytic packing includes a heterogeneous catalyst, which is one or a combination of several of the following: iron tetroxide, manganese dioxide, aluminum oxide, copper oxide, cobalt oxide, magnesium oxide, zinc oxide and nickel oxide.

2. The zero-discharge treatment process for wastewater from jet weaving according to claim 1, characterized in that, The wastewater has a COD of 300–400 mg / L and an SS of 100–150 mg / L.

3. The zero-discharge treatment process for wastewater from jet weaving according to claim 1, characterized in that, The coagulant is polyaluminum sulfate and polyacrylamide; the ratio of polyaluminum sulfate, polyacrylamide and wastewater is 50-100 mg: 10-20 mg: 1 L.

4. The zero-discharge treatment process for wastewater from weaving as described in claim 1, characterized in that, The mass ratio of the modified gelatin biofilm carrier to the volcanic rock is 1:1; The total amount of concentrated water and electrodialysis water produced by the electrodialysis method is mixed with sanitary water and then used in the sanitary water system.

5. The zero-discharge treatment process for wastewater from jet weaving according to claim 1, characterized in that, The modified gelatin biofilm carrier is prepared through the following steps: Gelatin and anhydride containing double bonds were dissolved in PBS buffer at pH 7.5 and reacted at 45–60 °C for 6–8 h. After freeze-drying, acylated modified gelatin was obtained. Acylated modified gelatin, chitosan and photoinitiator were added to deionized water and frozen at -20–-10 °C for 12–20 h. After that, it was irradiated under ultraviolet light and finally freeze-dried for 1–2 days to obtain modified gelatin biofilm carrier.

6. The zero-discharge treatment process for wastewater from weaving according to claim 5, characterized in that, The ratio of gelatin, double-bonded acid anhydride, and PBS buffer is 1–1.1 g: 0.06–0.08 g: 25–30 mL; the ratio of acylated modified gelatin, chitosan, photoinitiator, and deionized water is 1–1.1 g: 0.2 g–0.4 g: 0.1–0.15 g: 35–40 mL.

7. The zero-discharge treatment process for wastewater from jet weaving according to claim 5, characterized in that, The intensity of the ultraviolet light is 80–100 mW / cm². 2 The irradiation time is 15-20 minutes.

8. The zero-discharge treatment process for wastewater from jet weaving according to claim 5, characterized in that, The acid anhydride containing double bonds is one of methacrylic anhydride and angelic anhydride; the photoinitiator is one of 2-hydroxymethylphenylacetone and benzoin.

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