Zero-discharge treatment process for jet weaving wastewater

Abstract

The invention discloses a zero-discharge treatment process for jet weaving wastewater, and belongs to the field of jet weaving wastewater treatment. The method specifically comprises the following steps: S1, conveying the jet weaving wastewater into an adjusting tank, homogenizing the jet weaving wastewater in the adjusting tank, then adjusting the pH value, adding a coagulant for full coagulation, and filtering; s2, the wastewater treated in the step S1 is introduced into a filter tank comprising a filter material layer to be filtered, and a filter material phase in the filter material layer comprises a modified gelatin biofilm carrier and volcanic rock; s3, mixing the wastewater treated in the step S2 with ozone, feeding the mixture into an oxidation tower filled with catalytic filler, and performing oxidation treatment; and S4, removing metal ions from the wastewater subjected to oxidation treatment in S3 through an electrodialysis method, and enabling the treated wastewater to flow back to a water-jet loom for reuse. According to tests, the zero-discharge treatment process for the jet weaving wastewater, provided by the invention, has the advantages that the effect of reducing COD and SS in the wastewater is good, all the wastewater and substances generated by treatment are recycled, zero discharge is realized, and environmental protection is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of weaving-jet wastewater treatment, and in particular relates to a zero-discharge treatment process for weaving-jet wastewater. Background Art

[0002] As one of the most widely used weaving equipment in my country's current textile industry, water jet looms have the advantages of high output, good quality and low weaving costs, but they consume a lot of high-quality tap water. In the weaving process, in order to improve the smoothness and wear resistance of the warp, it is necessary to select suitable slurries, mainly chemical slurries and starch slurries. The use of slurries makes the COD and SS of the effluent high. If the wastewater from water jet looms cannot be effectively treated and recycled, it will lead to huge water environmental pollution and waste of resources.

[0003] Publication number: CN104045178 A's patent application discloses a method for treating and reusing wastewater from a water jet loom; the application adopts the method of "oil separation + coal slag adsorption + coagulation and sedimentation + flotation + mechanical filtration + reuse", where the wastewater from the water jet loom enters a grid well, an oil separation device, and a row-type coal slag oil absorption device for oil separation pretreatment, flows by gravity into a homogenization regulating tank, is lifted by a pump, and sodium hydroxide, polyaluminum chloride and polyacrylamide are added to three sets of pipeline mixers respectively, and is sent to a coagulation and sedimentation device and a high-efficiency flotation device for physical and chemical treatment. The effluent flows by gravity into an intermediate water tank, and is then lifted by a pump and sent 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 lifted by a pump and sent to a water jet loom for recycling and reuse; the separated floating oil, particulate colloid and debris can be mixed with coal and sent to a boiler for incineration; the physicochemical floating sludge, physicochemical sedimentation sludge and flushing water are collected and flowed by gravity into a sludge concentration tank, and are sent to a sludge dewatering machine for dehydration by a screw pump, and the recycling rate of the wastewater treated from the water jet loom can reach more than 95%. However, the wastewater treatment method has a complex process flow, and the water quality indicators such as conductivity and hardness are difficult to control. The disposal of the generated physical and chemical sludge and oil substances has not been considered. If improperly disposed of, it will cause secondary pollution to the environment. Summary of the invention

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

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A zero-discharge treatment process for spray-woven wastewater, such as Figure 1 As shown, the following steps are included:

[0007] S1: The spraying wastewater is transported into the regulating tank, homogenized and weighed, and then the pH is adjusted, coagulant is added for full coagulation, and then filtered;

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

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

[0010] S4: The wastewater after oxidation treatment in S3 is subjected to electrodialysis to remove metal ions and can be returned to the water jet loom for reuse after treatment.

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

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

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

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

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

[0016] Furthermore, the catalytic filler includes a heterogeneous catalyst, and the heterogeneous catalyst is one or a combination of ferroferric oxide, manganese dioxide, aluminum oxide, copper oxide, cobalt oxide, magnesium oxide, zinc oxide and nickel oxide.

[0017] When the wastewater passes through the filter layer, it constantly contacts the filter material of the filter layer, so that the microorganisms multiply on the surface of the filter material and form a biofilm. The biofilm is a biological community structure composed of a variety of microorganisms and micro-animals. The surface of the biofilm always adsorbs a thin layer of wastewater, which is called "attached water", and its outer layer is wastewater that can flow freely, called "moving water". When the organic matter in the attached water is adsorbed and oxidized and decomposed 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 is high, so a mass transfer process occurs. The organic matter in the wastewater is continuously transferred in and decomposed by microorganisms. The oxygen consumed by the microorganisms enters the biofilm along the air, the moving water layer, and the attached water layer; the inorganic matter and CO produced by the decomposition of organic matter by the microorganisms 2 The wastewater is purified in this process.

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

[0019] The gelatin and the acid anhydride containing double bonds are dissolved in a PBS buffer solution with a pH of 7.5, and reacted at 45 to 60°C for 6 to 8 hours; freeze-dried to obtain acylated modified gelatin; the acylated modified gelatin, chitosan and a photoinitiator are added to deionized water, and frozen at -20 to -10°C for 12 to 20 hours; then irradiated under ultraviolet light, and finally freeze-dried for 1 to 2 days to obtain a modified gelatin biofilm carrier.

[0020] Furthermore, the usage ratio of the gelatin, the modifier and the PBS buffer solution is 1-1.1 g: 0.06-0.08 g: 25-30 mL; the usage ratio of the acylated modified gelatin, chitosan, the 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 illumination intensity of the ultraviolet light is 80-100 mW / cm 2 The irradiation time is 15 to 20 minutes.

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

[0023] Beneficial effects of the present invention:

[0024] (1) The invention adopts a zero-discharge treatment process for textile wastewater, which applies ozone purification technology to the treatment of textile wastewater, wherein ozone is first introduced into an oxidation tower, and under the action of a heterogeneous catalyst, COD that is not completely treated by biocatalysis is reduced, and at the same time, it also plays a role in sterilization and disinfection; at this time, the unreacted ozone is introduced into a regulating tank, which consumes a part of COD to reduce the biodegradation pressure on the one hand, and on the other hand, the ozone is oxidized and reacted into oxygen and introduced into a filtration tank, and the oxygen-rich environment promotes the growth of aerobic bacteria and improves the degradation efficiency. Appropriate concentrations of calcium and magnesium ions will promote the growth and reproduction of microorganisms; the invention realizes the full utilization of ozone and minimizes energy consumption, achieving zero discharge.

[0025] (2) The modified gelatin biofilm carrier used in the present invention is mixed with volcanic rock as filter material. The porous structure of both can provide a good living environment for microorganisms and absorb calcium and magnesium ions in wastewater at the same time. The modified gelatin biofilm carrier has the characteristics of non-biotoxicity and biodegradability, and the biofilm carrier prepared with gelatin has a porous structure. It itself and its degradation products can serve as carbon and nitrogen sources for the growth and reproduction of microorganisms. The added chitosan can absorb calcium and magnesium ions and also provide nutrients for microorganisms. However, due to its soft texture, it is easy to accumulate and deform in actual applications. After mixing with volcanic rock, the stability of the filter material can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the process flow of zero-discharge treatment of spray-woven wastewater according to the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

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

[0031] In the first step, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution with a pH of 7.5, and reacted at 45°C for 8 h; freeze-dried to obtain acylated modified gelatin, 1 g of acylated modified gelatin, 0.2 g of chitosan and 0.1 g of 2-hydroxymethylpropiophenone were added to 40 mL of deionized water, and frozen at -20 to -10°C for 20 h; then irradiated under ultraviolet light with an intensity of 100 mW / cm 2 , irradiation time was 15 min, and finally freeze-dried for 2 d to obtain a modified gelatin biofilm carrier with a porous structure;

[0032] In the second step, the spraying wastewater is transported into the regulating tank, where it is homogenized, equalized and pH adjusted. It is then pumped into the flotation device with 60 mg / L polyaluminium sulfate and 10 mg / L polyacrylamide by the regulating tank lifting pump for full coagulation to remove some oil and suspended matter.

[0033] In the third step, the wastewater treated in the second step reaches a filter tank including a filter material layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1) through a water inlet and is filtered;

[0034] In the fourth step, the wastewater treated in the third step is mixed with ozone and enters an oxidation tower filled with catalytic filler (including a mixed catalyst of ferrosoferric oxide and manganese dioxide). After the ozone is consumed, it is recovered from the top of the oxidation tower and passed into a regulating tank, and then recovered from the regulating tank and passed into a filtration tank;

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

[0036] The above steps are as follows Figure 1 As shown: the water jet loom wastewater is treated in sequence through a regulating tank, a filtration tank, an oxidation tower and an electrodialysis step. After the wastewater is treated by electrodialysis, it can be directly used in the water jet loom; the total amount of concentrated water and polar water produced by the electrodialysis method is mixed with sanitary water and used in the sanitary water system.

[0037] Ozone is introduced from the bottom of the oxidation tower, and is oxidized in the oxidation tower to reduce the COD value in the wastewater. Low-concentration ozone is recovered from the top of the oxidation tower and then introduced into the regulating tank to reduce a certain amount of COD in the wastewater. Ozone is then obtained as oxygen-rich gas, which is then introduced into the filtration tank. The oxygen-rich gas will promote the growth and reproduction of microorganisms and improve the efficiency of degrading microorganisms.

[0038] Example 2

[0039] The present embodiment is different from the embodiment 1 in that "0.2 g chitosan" in the first step is changed to "0.4 g chitosan".

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

[0041] Example 3

[0042] The present embodiment is different from the embodiment 1 in that the “60 mg / L polyaluminium sulfate and 10 mg / L polyacrylamide” in the second step is changed to “100 mg / L polyaluminium sulfate and 20 mg / L polyacrylamide”.

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

[0044] Example 4

[0045] Compared with Example 1, this embodiment differs in that the direction of ozone introduction in the second to fourth steps is changed, and the specific implementation steps are as follows:

[0046] In the second step, the spraying wastewater is transported into the regulating tank, where it is homogenized, equalized and pH adjusted. It is then pumped into the flotation device with 60 mg / L polyaluminium sulfate and 10 mg / L polyacrylamide by the regulating tank lifting pump for full coagulation to remove some oil and suspended matter.

[0047] In the third step, the wastewater treated in the second step reaches a filter tank including a filter material layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1) through a water inlet and is filtered;

[0048] In the fourth step, the wastewater treated in the third step is mixed with ozone and enters an oxidation tower filled with catalytic filler (including a mixed catalyst of ferroferric oxide and manganese dioxide). After the ozone is consumed, it is recovered from the top of the oxidation tower and passed into a filter tank;

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

[0050] Example 5

[0051] In the first step, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution with a pH of 7.5, and reacted at 45°C for 8 h; freeze-dried to obtain acylated modified gelatin, 1 g of acylated modified gelatin, 0.2 g of chitosan and 0.1 g of 2-hydroxymethylpropiophenone were added to 40 mL of deionized water, and frozen at -20 to -10°C for 20 h; then irradiated under ultraviolet light with an intensity of 100 mW / cm 2 , irradiation time was 15 min, and finally freeze-dried for 2 d to obtain a modified gelatin biofilm carrier with a porous structure;

[0052] In the second step, the spraying wastewater is transported into the regulating tank, where it is homogenized, equalized and pH adjusted. It is then pumped into the flotation device with 60 mg / L polyaluminium sulfate and 10 mg / L polyacrylamide by the regulating tank lifting pump for full coagulation to remove some oil and suspended matter.

[0053] In the third step, the wastewater treated in the second step reaches a filter tank including a filter material layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1) through a water inlet and is filtered;

[0054] In the fourth step, the wastewater treated in the third step is mixed with ozone and enters an oxidation tower filled with catalytic filler (including a mixed catalyst of ferrosoferric oxide and manganese dioxide);

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

[0056] Comparative Example 1

[0057] Compared with Example 1, this comparative example differs in that chitosan is not added in the first step, and the specific implementation steps are as follows:

[0058] In the first step, 1 g of gelatin and 0.06 g of methacrylic anhydride are dissolved in 25 mL of PBS buffer solution with a pH of 7.5, and reacted at 45°C for 8 hours; freeze-dried to obtain acylated modified gelatin, 1 g of acylated modified gelatin and 0.1 g of 2-hydroxymethylpropiophenone are added to 40 mL of deionized water, and frozen at -20 to -10°C for 20 hours; then irradiated under ultraviolet light with an intensity of 100 mW / cm 2 , irradiation time was 15 min, and finally freeze-dried for 2 d to obtain a modified gelatin biofilm carrier with a porous structure;

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

[0060] Comparative Example 2

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

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

[0063] Comparative Example 3

[0064] The difference between this comparative example and Example 1 is that in the third step, the "filter material layer (modified gelatin biofilm carrier: volcanic rock mass ratio is 1:1)" is replaced by "filter material layer (volcanic rock)".

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

[0066] Comparative Example 4

[0067] In the first step, the spraying wastewater is transported into the regulating tank, where it is homogenized, equalized and pH adjusted. Then, the regulating tank lifting pump pumps the wastewater into the flotation device with 60 mg / L polyaluminium sulfate and 10 mg / L polyacrylamide for full coagulation to remove some oil and suspended matter.

[0068] In the second step, the wastewater treated in the first step is mixed with ozone and enters an oxidation tower filled with catalytic filler (including a mixed catalyst of ferrosoferric oxide and manganese dioxide). After the ozone is consumed, it is recovered from the top of the oxidation tower and passed into a regulating tank;

[0069] Step 3: The wastewater treated in the second step is subjected to electrodialysis to remove metal ions.

[0070] Comparative Example 5

[0071] In the first step, 1 g of gelatin and 0.06 g of methacrylic anhydride were dissolved in 25 mL of PBS buffer solution with a pH of 7.5, and reacted at 45°C for 8 h; freeze-dried to obtain acylated modified gelatin, 1 g of acylated modified gelatin, 0.2 g of chitosan and 0.1 g of 2-hydroxymethylpropiophenone were added to 40 mL of deionized water, and frozen at -20 to -10°C for 20 h; then irradiated under ultraviolet light with an intensity of 100 mW / cm 2 , irradiation time was 15 min, and finally freeze-dried for 2 d to obtain a modified gelatin biofilm carrier with a porous structure;

[0072] In the second step, the spraying wastewater is transported into the regulating tank, where it is homogenized, equalized and pH adjusted. It is then pumped into the flotation device with 60 mg / L polyaluminium sulfate and 10 mg / L polyacrylamide by the regulating tank lifting pump for full coagulation to remove some oil and suspended matter.

[0073] In the third step, the wastewater treated in the second step reaches a filter tank including a filter material layer (modified gelatin biofilm carrier: volcanic rock mass ratio of 1:1) through a water inlet and is filtered;

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

[0075] Comparative Example 6

[0076] This comparative test is to achieve the amount of polyaluminium sulfate and polyacrylamide required to achieve the qualified SS content without filtering in the filter tank.

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

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

[0079] According to the "Water and Wastewater Monitoring and Analysis Method" of the State Environmental Protection Administration, the water quality of each embodiment and comparative example of the present application was monitored:

[0080] The results are shown in Table 1:

[0081] Table 1

[0082]

[0083] The amount of polyaluminium sulfate and polyacrylamide required to achieve the qualified SS content without filtration in the filter pool was tested, and the results are shown in Table 2:

[0084] Table 2

[0085]

[0086] It can be seen from Table 1 that, compared with Example 1, the difference between Examples 2 to 3 is only the change in the amount of raw material added within a reasonable implementation range, which has little effect on the final result; compared with Example 1, Example 4 changes the circulation direction of ozone, and the air containing a part of ozone is directly passed into the filter tank, which will reduce the activity of microorganisms and reduce the effect of microorganisms in removing organic matter in water; compared with Example 1, Example 5 does not recycle ozone after oxidation treatment, which reduces the COD treatment efficiency and the utilization rate of ozone.

[0087] Compared with Example 1, the results of Comparative Example 1 mainly show an increase in conductivity, because chitosan can not only serve as a nutrient for the growth and reproduction of microorganisms, but also effectively adsorb calcium and magnesium ions in water; Compared with Example 1, although polypropylene is also a good biofilm carrier, it is a non-degradable organic material that is difficult to decompose and will cause plastic pollution problems, and the modified gelatin biofilm carrier prepared by the present invention realizes the attachment of microorganisms and provides nutrients, and the materials are environmentally friendly and will not cause secondary pollution; In Comparative Example 3, when only volcanic rock is used as a biofilm carrier, the C in wastewater is not effectively adsorbed. The removal effect of OD is not ideal; in Comparative Example 4, the wastewater is not filtered through the filter tank, and the purification effect of the spray-woven wastewater is even worse; Compared with the embodiment, the difference between Comparative Example 5 and the embodiment is that ozone is not introduced, and ozone plays an extremely critical role in the whole system. On the one hand, it reduces the COD that is not completely treated by biocatalysis under the action of heterogeneous catalysts, and also plays a role in sterilization and disinfection; at this time, the unreacted ozone is introduced into the regulating tank, on the one hand, it consumes part of the COD to reduce the biodegradation pressure, and on the other hand, the ozone is oxidized and reacts to form oxygen and is introduced into the filter tank. The oxygen-rich environment will promote the growth of aerobic bacteria and improve the degradation efficiency.

[0088] It can be seen from Table 2 that in Comparative Example 6, 250 mg / L polyaluminum sulfate and 60 mg / L polyacrylamide are required to achieve the qualified SS content without filtering in the filter tank, which not only increases the cost of the reagents but also increases the conductivity of the wastewater and the pressure of electrodialysis to remove metal ions.

[0089] In summary, the invention provides a zero-discharge treatment process for spray weaving wastewater, which has a good effect of reducing COD and SS in the wastewater, reduces the conductivity of the wastewater, and the wastewater and treatment products are all recycled, with zero discharge, which is beneficial to environmental protection.

[0090] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A zero-discharge treatment process for spray-woven wastewater, characterized in that: The steps include: S1: The spraying wastewater is transported into the regulating tank, homogenized and weighed, and then the pH is adjusted, coagulant is added for full coagulation, and then filtered; S2: the wastewater treated by S1 is passed into a filter tank including a filter material layer for filtration, wherein the filter material phase in the filter material 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 fillers for oxidation treatment; S4: The wastewater after oxidation treatment in S3 is subjected to electrodialysis to remove metal ions and can be returned to the water jet loom for reuse after treatment.

2. A zero-discharge treatment process for spray-woven wastewater according to claim 1, characterized in that: After the ozone in S3 is consumed, it is recovered from the top of the oxidation tower and passed into the S1 regulating tank, and then recovered from the S1 regulating tank and passed into the S2 filtration tank.

3. A zero-discharge treatment process for spray-woven wastewater according to claim 1, characterized in that: The wastewater has a COD of 300-400 mg / L and a SS of 100-150 mg / L.

4. A zero-discharge treatment process for spray-woven wastewater according to claim 1, characterized in that: The coagulants are polyaluminium sulfate and polyacrylamide; the dosage ratio of the polyaluminium sulfate, polyacrylamide and wastewater is 50-100mg:10-20mg:1L.

5. A zero-discharge treatment process for spray-woven wastewater according to claim 1, characterized in that: The mass ratio of the modified gelatin biofilm carrier to the volcanic rock is 1:1; The concentrated water and the total amount of polar water produced by the electrodialysis method are mixed with sanitary water and then used in the sanitary water system.

6. A zero-discharge treatment process for spray-woven wastewater according to claim 1, characterized in that: The catalytic filler comprises a heterogeneous catalyst, and the heterogeneous catalyst is one or a combination of ferroferric oxide, manganese dioxide, aluminum oxide, copper oxide, cobalt oxide, magnesium oxide, zinc oxide and nickel oxide.

7. A zero-discharge treatment process for spray-woven wastewater according to claim 1, characterized in that: The modified gelatin biofilm carrier is prepared by the following steps: The gelatin and the acid anhydride containing double bonds are dissolved in a PBS buffer solution with a pH of 7.5, and reacted at 45 to 60°C for 6 to 8 hours; freeze-dried to obtain acylated modified gelatin; the acylated modified gelatin, chitosan and a photoinitiator are added to deionized water, and frozen at -20 to -10°C for 12 to 20 hours; then irradiated under ultraviolet light, and finally freeze-dried for 1 to 2 days to obtain a modified gelatin biofilm carrier.

8. A zero-discharge treatment process for spray-woven wastewater according to claim 7, characterized in that: The usage ratio of the gelatin, the modifier and the PBS buffer solution is 1-1.1 g: 0.06-0.08 g: 25-30 mL; the usage ratio of the acylated modified gelatin, chitosan, the photoinitiator and deionized water is 1-1.1 g: 0.2 g-0.4 g: 0.1-0.15 g: 35-40 mL.

9. A zero-discharge treatment process for spray-woven wastewater according to claim 7, characterized in that: The illumination intensity of the ultraviolet light is 80-100 mW / cm 2 The irradiation time is 15 to 20 minutes.

10. A zero-discharge treatment process for spray-woven wastewater according to claim 7, characterized in that: The acid anhydride containing double bonds is one of methacrylic anhydride and angelica anhydride; the photoinitiator is one of 2-hydroxymethylpropiophenone and benzoin.

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