Method for treating sewage and cleaning fluid sewage generated in retainer grinding process

Abstract

The invention discloses a method for treating sewage and cleaning fluid sewage generated in a holder grinding process, and belongs to the technical field of sewage treatment. The treatment method comprises the following steps: adding a magnetic rod and a pretreatment agent into sewage generated in a grinding process and cleaning fluid sewage for treatment, carrying out primary filter pressing, conveying the sewage into a sewage cylinder, mixing the sewage treatment agent with water, filling a liquid medicine cylinder, synchronously conveying the liquid medicine cylinder into a stirring cylinder for primary stirring, and carrying out secondary filter pressing on the liquid medicine cylinder; and adding an oxidizing agent, stirring for the second time, carrying out secondary filter pressing, conveying into a precipitation cylinder, and standing to obtain the treated water. According to the method, sewage generated by grinding and processing and sewage generated in the subsequent cleaning process are subjected to combined treatment, pretreatment is performed through a pretreatment agent and a magnetic rod, then a sewage treatment agent and an oxidizing agent are added to synergistically degrade and remove organic pollutants in the sewage, and the COD value in the sewage is reduced.

Description

Technical Field

[0001] This application relates to a method for treating wastewater and cleaning fluid generated during cage grinding processes, belonging to the field of wastewater treatment technology. Background Technology

[0002] The wastewater generated during cage grinding and subsequent cleaning processes is complex in composition and difficult to treat. The grinding process uses grinding fluid for precision grinding, which typically contains emulsifiers, wetting agents, rust inhibitors (such as inorganic salts and organic amines), extreme pressure additives (compounds containing sulfur, phosphorus, and chlorine), base oils, metal shavings, and abrasive particles. The cleaning process primarily uses cleaning agents to remove grinding fluid residue and oil from the workpiece surface. These cleaning agents typically contain alkaline substances such as sodium hydroxide and sodium silicate, composite surfactants, and defoamers. Therefore, the surfactants in the cage grinding process and the cleaning fluid cause oil and fine particles to form stable oil-in-water emulsions, making demulsification difficult; they also contain a large amount of non-biodegradable organic compounds, resulting in poor biodegradability; and the small particle size of the metal powder and abrasive powder makes sedimentation and filtration difficult.

[0003] In existing technologies, inorganic salt coagulants are typically used to demulsify wastewater containing large amounts of organic pollutants and metal ions. However, their effectiveness is not ideal, resulting in low oil and COD removal rates, often turbid water that fails to consistently meet standards, and large amounts of sludge are generated. Furthermore, the recalcitrant synthetic organic matter in wastewater inhibits or even toxicizes microorganisms, leading to low treatment efficiency. Additionally, existing technologies usually treat wastewater from grinding and washing processes separately, increasing the repetitiveness of treatment. Moreover, the high impurity content in the grinding wastewater makes treatment more difficult. By combining the wastewater from the grinding process with that from the subsequent washing process, only a single treatment step is needed, shortening treatment time and improving efficiency. Summary of the Invention

[0004] To address the aforementioned issues, a method for treating wastewater and cleaning fluid generated during cage grinding is provided. This method combines the wastewater from the grinding process with the wastewater from the subsequent cleaning process. Pretreatment agents and magnetic rods are used to adsorb and remove some metal ions and impurities from the wastewater. Then, wastewater treatment agents are added to treat the remaining impurities. After adding an oxidant, the wastewater treatment agents work synergistically to degrade and remove organic pollutants in the wastewater, thereby reducing the COD value of the wastewater.

[0005] One aspect of this application provides a method for treating wastewater and cleaning fluid generated during cage grinding processes, comprising the following steps: (1) Add a magnetic suction rod to the wastewater and cleaning liquid generated by the grinding process, then add the pretreatment agent, stir and react for 20-30 minutes, and perform the first pressure filtration to remove larger impurities in the wastewater. (2) The pretreated wastewater in step (1) is transported to the wastewater tank. The wastewater treatment agent is mixed with water to obtain the wastewater treatment solution, which is then loaded into the solution tank. The wastewater treatment solution and wastewater are then transported to the mixing tank simultaneously. The first stirring is carried out in the mixing tank for 0.5-1h. Then, an oxidant is added to the mixing tank for the second stirring for 20-30min. (3) After the water treated in step (2) is filtered for the second time, it is sent to the sedimentation tank and left to stand in the sedimentation tank for 45-60 minutes to obtain the treated water.

[0006] In this treatment method, the magnetic suction rod works synergistically with the pretreatment agent to adsorb or aggregate ferromagnetic metal powders or particles and oil droplets in the wastewater, reducing the content of dispersed impurities in the wastewater. Then, a first pressure filtration removes clumps and larger particles of impurities from the wastewater. By adding wastewater treatment agents to adsorb smaller metal ions and disrupt the emulsion system, the efficiency of wastewater treatment is improved. Subsequently, an oxidant is added; the oxidant and wastewater treatment agents synergistically enhance the degradation and removal of organic pollutants in the wastewater. After a second pressure filtration, the large particle clusters formed by the adsorption of the wastewater treatment agents are removed from the wastewater, thereby improving the removal effect of impurities in the wastewater.

[0007] Preferably, the pretreatment agent comprises, by weight, 5-10 parts of diethylenetriaminepentaacetic acid and 5-10 parts of polyoxyethylene polyoxypropylene ether.

[0008] Polyoxyethylene polyoxypropylene ether can react with Cu²⁺ in wastewater through multiple coordinating groups, such as -COOH and -NH⁻. + Ni² + Polyoxyethylene polyoxypropylene ether (POPE) forms stable chelates with heavy metal ions. By adjusting the HLB value, it reduces interfacial tension, promoting the aggregation and floating of oil droplets. Its polymer chains can adsorb chelated heavy metal ions, forming composite flocs that facilitate subsequent impurity removal. PPE forms hydrogen bonds with the amino and carboxyl groups in diethylenetriaminepentaacetic acid (DICA), increasing the apparent molecular weight of the chelate and enhancing flocculation and sedimentation speed. The synergistic effect of both not only chelates heavy metal ions in wastewater but also breaks up emulsions in the wastewater, causing oil droplets to aggregate and float for easier removal. This improves wastewater treatment efficiency, reduces impurities and oil content in wastewater, and ensures treated water meets discharge or recycling standards.

[0009] Preferably, the pretreatment agent is added in two steps: first, polyoxyethylene polyoxypropylene ether is added to the wastewater and stirred for 10-15 minutes, and then diethylenetriaminepentaacetic acid is added to the wastewater and stirred for 10-15 minutes.

[0010] By first adding polyoxyethylene polyoxypropylene ether (POPE) to demulsify the emulsion system in wastewater, causing oil droplets to float to the surface and releasing metal ions adsorbed at the oil-water interface, followed by the addition of diethylenetriaminepentaacetic acid (DTA), the metal ions in the wastewater are chelated, reducing the dispersibility of impurities. The aggregated impurities can then be removed through a first pressure filtration, reducing impurities and COD levels in the wastewater. However, if DTA is added first, it will preferentially chelate small amounts of free heavy metal ions, preventing the heavy metals released after demulsification by the subsequent addition of PTA from being fully chelated, thus reducing treatment efficiency. Although this reduces efficiency, adding DTA first followed by PTA still allows it to function as a pretreatment agent. Adding both DTA and PTA simultaneously also achieves the desired pretreatment effect. Therefore, adding the pretreatment agent in two stages, first PTA and then DTA, is a preferred approach.

[0011] Optionally, the amount of the pretreatment agent added is 10-15 g / m³. 3 .

[0012] At this dosage, the emulsified system in the wastewater can be broken down, causing oil droplets to float to the surface. This fully releases metal ions adsorbed at the oil-water interface and chelates and adsorbs these ions to form flocs, facilitating subsequent removal. If the dosage of the pretreatment agent is too low, the pretreatment effect will be insufficient, reducing its effectiveness. This not only fails to improve treatment efficiency but also increases the workload of the treatment method. Conversely, if the dosage is too high, it will leave residues in the wastewater, affecting subsequent wastewater treatment and ultimately reducing the overall treatment effect.

[0013] Optionally, the dosage of the wastewater treatment agent is 32-40 g / m³. 3 .

[0014] The metal ion content in the water treated by the pretreatment agent will be relatively reduced, and the oil droplet content and emulsion system in the water will also be relatively unstable. At this dosage, the low-content metal ions can be chelated, and the residual oil droplets can be further adsorbed and removed. At the same time, when the impurity content in the wastewater is low, the wastewater treatment agent can further remove the impurities in the wastewater, further enhancing the wastewater treatment effect and making the wastewater meet the discharge standards or reuse requirements.

[0015] Optionally, the stirring speed for the first stirring in step (2) is 60-80 r / min.

[0016] At this stirring speed, the pretreatment agent can be fully mixed with the wastewater, maximizing the chelation and adsorption effects, improving treatment efficiency, providing a foundation for the subsequent wastewater treatment agents to function, and promoting the convenience of the entire treatment method.

[0017] Optionally, the stirring speed of the second stirring in step (2) is 40-50 r / min.

[0018] At this stirring speed, the wastewater treatment agent can be fully mixed with the wastewater, chelating the more dispersed metal ions in the wastewater and forming larger flocs, which are then easier to remove by subsequent pressure filtration.

[0019] Optionally, the amount of oxidant added is 2-4 g / m³. 3 .

[0020] At this dosage, the oxidant can degrade the organic pollutants in the wastewater, reducing their content in the wastewater. In particular, the wastewater generated from grinding and subsequent cleaning processes contains a large amount of organic pollutants, and the removal effect by pressure filtration or wastewater treatment agents is not ideal. Therefore, adding an oxidant can degrade the organic pollutants in the wastewater and effectively reduce the COD value of the treated water.

[0021] Optionally, the wastewater treatment agent comprises, by mass fraction: 10-20 parts polyacrylamide, 5-10 parts activated carbon, 10-15 parts modified chitosan, and 10-20 parts polyaluminum chloride; wherein the modified chitosan is prepared by an addition reaction between chitosan and tetrachloro-1,4-benzoquinone.

[0022] Optionally, the preparation method of the modified chitosan includes the following steps: S1: Dissolve chitosan in an aqueous acetic acid solution, adjust the pH of the chitosan aqueous solution to 5.0-5.5 with an alkaline solution, and stir until completely dissolved to obtain a chitosan solution; S2: Add tetrachloro-1,4-benzoquinone to anhydrous ethanol, stir and mix evenly, then add dropwise to chitosan solution and stir to react under light-protected conditions; S3: After centrifugation or filtration, the precipitate is collected, repeatedly washed with water until the supernatant is colorless, and then freeze-dried to obtain modified chitosan.

[0023] Optionally, in step S2, the reaction temperature is 30-50℃ and the reaction time is 8-12h.

[0024] Optionally, the molar ratio of chitosan to tetrachloro-1,4-benzoquinone is 1:(0.4-0.6).

[0025] At this molar ratio, reactive amino groups are grafted onto chitosan chains with quinone groups. This not only allows chitosan to contain more redox active sites, but also avoids drastic changes in chain rigidity and solubility caused by excessive grafting, thus effectively reducing impurities in wastewater.

[0026] Optionally, the alkaline solution is a 5% sodium hydroxide aqueous solution.

[0027] Optionally, the oxidant is peracetic acid.

[0028] Peracetic acid molecules contain peroxy bonds, which can decompose in water to produce hydroxyl radicals that can non-selectively attack functional groups such as double bonds, benzene rings, and ester bonds in organic molecules, causing them to break and subsequently degrade, thus reducing the content of organic pollutants in wastewater. The peroxy bonds of peracetic acid also have strong oxidizing properties, oxidizing the remaining tetrachloro-1,4-benzoquinone in water, further generating hydroxyl radicals, which adsorb impurities in wastewater and can cause the benzene ring to open and degrade, thus preventing an increase in the content of impurities in wastewater.

[0029] The beneficial effects of this application include, but are not limited to: 1. The wastewater and cleaning fluid wastewater treatment method for the cage grinding process according to this application combines the wastewater generated from the grinding process with the wastewater generated from the subsequent cleaning process for treatment, thereby improving wastewater treatment efficiency.

[0030] 2. The wastewater and cleaning solution wastewater treatment method of the cage grinding process of this application involves using pretreatment agents and magnetic suction rods to adsorb and remove some metal ions and impurities in the wastewater, then adding wastewater treatment agents to chelate and adsorb metal ions and impurities with low content and high dispersion in the wastewater, and then removing the impurities by a second pressure filtration.

[0031] 3. The wastewater and cleaning solution wastewater treatment method generated by the cage grinding process according to this application involves adding an oxidant to work synergistically with the wastewater treatment agent to degrade and remove organic pollutants in the wastewater. At the same time, peracetic acid can oxidize the tetrachloro-1,4-benzoquinone on the unchelated or unadsorbed chitosan, causing its benzene ring to open and degrade, thus avoiding an increase in the content of impurities in the wastewater and reducing the COD value of the wastewater. Detailed Implementation

[0032] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0033] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0034] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0035] The filter press model used in this application is not specifically limited, as long as it can achieve the filtration of wastewater. In the following embodiments and comparative examples of this application, the feed pressure of the filter press for both primary and secondary filtration is 8 kg / cm². 2 The pressing pressure is 12 kg / cm². 2 The blowing pressure is 12 kg / cm². 2 The air permeability of the filter cloth is 30 L / m. 2 / s, and the pressing time is 5 minutes.

[0036] In this embodiment, the mass fraction of the acetic acid aqueous solution is 1%. The number of magnetic rods is not specifically limited; it can be 1, 2, or 10. Those skilled in the art can choose according to their needs. In this embodiment and comparative example, there are 5 magnetic rods.

[0037] The polyacrylamide used in the embodiments and comparative examples of this application is cationic polyacrylamide with a molecular weight of 8 million and an ionic degree of 20%; the chitosan has a molecular weight of 150,000 and a degree of deacetylation of 85%; the activated carbon has a CAS number of 7440-44-0; the polyaluminum chloride has a CAS number of 101707-17-9; the polyoxyethylene polyoxypropylene ether has a CAS number of 9003-11-6; the diethylenetriaminepentaacetic acid has a CAS number of 67-43-6; and the tetrachloro-1,4-benzoquinone has a CAS number of 118-75-2.

[0038] Example 1 This embodiment relates to a method for treating wastewater and cleaning fluid generated during cage grinding processes, including the following steps: (1) Add a magnetic rod to the wastewater and cleaning solution generated during the grinding process, then add 10 parts of polyoxyethylene polyoxypropylene ether and stir at 60 r / min for 10 min. Then add 10 parts of diethylenetriaminepentaacetic acid and stir at 60 r / min for 15 min. Control the amount of pretreatment agent added to 10 g / m 3 The first pressure filtration is performed to remove larger particles of impurities from the wastewater. (2) The pretreated wastewater from step (1) is transported to a wastewater tank. The wastewater treatment agent is mixed with 10 times the amount of water to obtain a wastewater treatment solution, which is then loaded into a solution tank. The wastewater treatment solution and wastewater are then simultaneously transported to a mixing tank, and the amount of wastewater treatment agent added is controlled to be 32 g / m³. 3 The mixture was first stirred in a mixing tank at a speed of 80 rpm for 0.5 hours. Afterward, peracetic acid was added to the mixing tank at a concentration of 2 g / m³. 3Perform a second stirring at a speed of 40 r / min for 30 min. The wastewater treatment agent comprises, by mass fraction: 20 parts polyacrylamide, 10 parts activated carbon, 15 parts modified chitosan, and 10 parts polyaluminum chloride; the preparation method of the modified chitosan includes the following steps: S1: Add chitosan to 50 times the amount of 1% acetic acid aqueous solution, adjust the pH of the chitosan solution to 5.5 with 5% sodium hydroxide aqueous solution, and stir until completely dissolved to obtain a chitosan solution; S2: Add tetrachloro-1,4-benzoquinone to 2 times the volume of anhydrous ethanol, stir and mix well, then add dropwise to the chitosan solution, controlling the molar ratio of chitosan to tetrachloro-1,4-benzoquinone to be 1:0.4, and stir the reaction for 12 h under light-protected conditions and at a reaction temperature of 30°C. S3: After centrifugation, the precipitate was collected, washed repeatedly with 50% ethanol aqueous solution until the supernatant was colorless, and then freeze-dried to obtain modified chitosan. (3) After the water treated in step (2) is filtered for the second time, it is sent to the sedimentation tank and left to stand in the sedimentation tank for 60 minutes to obtain the treated water.

[0039] Example 2 This embodiment relates to a method for treating wastewater and cleaning fluid generated during cage grinding processes, including the following steps: (1) Add a magnetic rod to the wastewater and cleaning solution generated during the grinding process, then add 5 parts of polyoxyethylene polyoxypropylene ether and stir for 10 min at 60 r / min. Then add 5 parts of diethylenetriaminepentaacetic acid and stir for 15 min at 60 r / min. Control the amount of pretreatment agent added to 10 g / m 3 The first pressure filtration is performed to remove larger particles of impurities from the wastewater. (2) The pretreated wastewater from step (1) is transported to a wastewater tank. The wastewater treatment agent is mixed with 10 times the amount of water to obtain a wastewater treatment solution, which is then loaded into a solution tank. The wastewater treatment solution and wastewater are then simultaneously transported to a mixing tank, and the amount of wastewater treatment agent added is controlled to be 40 g / m³. 3 The mixture was first stirred in a mixing tank at a speed of 60 rpm for 1 hour. Afterward, peracetic acid was added to the mixing tank at a controlled dosage of 4 g / m³. 3 Perform a second stirring at a speed of 50 r / min for 20 min. The wastewater treatment agent comprises, by mass fraction: 10 parts polyacrylamide, 5 parts activated carbon, 10 parts modified chitosan, and 20 parts polyaluminum chloride; the preparation method of the modified chitosan includes the following steps: S1: Add chitosan to 50 times the amount of 1% acetic acid aqueous solution, adjust the pH of the chitosan solution to 5.0 with 5% sodium hydroxide aqueous solution, and stir until completely dissolved to obtain a chitosan solution; S2: Add tetrachloro-1,4-benzoquinone to 2 times the volume of anhydrous ethanol, stir and mix well, then add dropwise to the chitosan solution, controlling the molar ratio of chitosan to tetrachloro-1,4-benzoquinone to be 1:0.6, and stir the reaction for 8 hours under light-protected conditions and at a reaction temperature of 50°C. S3: After filtration, the precipitate is collected, washed repeatedly with 50% ethanol aqueous solution until the supernatant is colorless, and then freeze-dried to obtain modified chitosan. (3) After the water treated in step (2) is filtered for the second time, it is sent to the sedimentation tank and left to stand in the sedimentation tank for 45 minutes to obtain the treated water.

[0040] Example 3 This embodiment relates to a method for treating wastewater and cleaning fluid generated during cage grinding processes, including the following steps: (1) Add a magnetic rod to the wastewater and cleaning solution generated during the grinding process, then add 8 parts of polyoxyethylene polyoxypropylene ether and stir for 10 minutes at 60 r / min. Then add 8 parts of diethylenetriaminepentaacetic acid and stir for 15 minutes at 60 r / min. Control the amount of pretreatment agent added to 12 g / m 3 The first pressure filtration is performed to remove larger particles of impurities from the wastewater. (2) The pretreated wastewater from step (1) is transported to a wastewater tank. The wastewater treatment agent is mixed with 10 times the amount of water to obtain a wastewater treatment solution, which is then loaded into a solution tank. The wastewater treatment solution and wastewater are then simultaneously transported to a mixing tank, and the amount of wastewater treatment agent added is controlled to be 36 g / m³. 3 The mixture was first stirred in a mixing tank at a speed of 70 rpm for 0.8 hours. Afterward, peracetic acid was added to the mixing tank at a controlled dosage of 3 g / m³. 3 Perform a second stirring at a speed of 45 r / min for 25 min. The wastewater treatment agent comprises, by mass fraction: 15 parts polyacrylamide, 8 parts activated carbon, 12 parts modified chitosan, and 15 parts polyaluminum chloride; the preparation method of the modified chitosan includes the following steps: S1: Add chitosan to 50 times the amount of 1% acetic acid aqueous solution, adjust the pH of the chitosan solution to 5.5 with 5% sodium hydroxide aqueous solution, and stir until completely dissolved to obtain a chitosan solution; S2: Add tetrachloro-1,4-benzoquinone to 2 times the volume of anhydrous ethanol, stir and mix well, then add dropwise to the chitosan solution, controlling the molar ratio of chitosan to tetrachloro-1,4-benzoquinone to be 1:0.5, and stir the reaction for 10 h under light-protected conditions and at a reaction temperature of 40℃. S3: After centrifugation, the precipitate was collected, washed repeatedly with 50% ethanol aqueous solution until the supernatant was colorless, and then freeze-dried to obtain modified chitosan. (3) After the water treated in step (2) is filtered for the second time, it is sent to the sedimentation tank and left to stand in the sedimentation tank for 45 minutes to obtain the treated water.

[0041] Example 4 The difference between this embodiment and embodiment 3 is that the amount of pretreatment agent added in step (1) is 5 g / m 3 The rest is the same as in Example 3.

[0042] Example 5 The difference between this embodiment and embodiment 3 is that the amount of wastewater treatment agent added in step (2) is 60g / m³. 3 The rest is the same as in Example 3.

[0043] Example 6 The difference between this embodiment and embodiment 3 is that the amount of oxidant added in step (2) is 10g / m 3 The rest is the same as in Example 3.

[0044] Example 7 The difference between this embodiment and embodiment 3 is that the wastewater treatment agent in step (2) includes, by mass fraction: 12 parts polyacrylamide, 8 parts activated carbon, 12 parts chitosan, 15 parts polyaluminum chloride, and the rest is the same as in embodiment 3.

[0045] Example 8 The difference between this embodiment and Example 3 is that the molar ratio of chitosan to tetrachloro-1,4-benzoquinone in step S2 is 1:0.1, while the rest is the same as in Example 3.

[0046] Example 9 The difference between this embodiment and embodiment 3 is that peracetic acid is replaced with sodium hypochlorite in step (2), and the rest is the same as in embodiment 3.

[0047] Comparative Example 1 The difference between this comparative example and Example 3 is that no pretreatment agent is added in step (1), while the rest is the same as Example 3.

[0048] Comparative Example 2 The difference between this comparative example and Example 3 is that no oxidant is added in step (2), while the rest is the same as in Example 3.

[0049] Comparative Example 3 This comparative example relates to a method for treating wastewater and cleaning fluid generated during cage grinding processes, including the following steps: (1) Add a magnetic rod to the wastewater and cleaning solution generated during the grinding process, then add 8 parts of polyoxyethylene polyoxypropylene ether and stir for 10 minutes at 60 r / min. Then add 8 parts of diethylenetriaminepentaacetic acid and stir for 15 minutes at 60 r / min. Control the amount of pretreatment agent added to 12 g / m 3 The first pressure filtration is performed to remove larger particles of impurities from the wastewater. (2) The pretreated wastewater from step (1) is transported to the wastewater tank, and the wastewater treatment agent is added directly to the wastewater tank, controlling the amount of wastewater treatment agent added to be 36g / m³. 3 The wastewater tank was first stirred at a speed of 70 rpm for 0.8 hours. Afterwards, peracetic acid was added to the wastewater tank at a controlled dosage of 3 g / m³. 3 Perform a second stirring at a speed of 45 r / min for 25 min. (3) After the water treated in step (2) is filtered for the second time, it is sent to the sedimentation tank and left to stand in the sedimentation tank for 45 minutes to obtain the treated water. The wastewater treatment agent used in this comparative example is the same as that in Example 3.

[0050] Test Example 1 1) COD removal rate: The COD removal rate in wastewater was tested according to the testing method in GB / T15456-2019; 2) Suspended solids content test: The removal rate of suspended solids in water was tested according to the test method in GB 11901-1989; the specific test results are shown in Table 1.

[0051] Table 1

[0052] Test Example 2 1) Turbidity test: The test is conducted using a turbidimeter; 2) Total hardness test: The total hardness was determined by the disodium ethylenediaminetetraacetate titration method; the specific test results are shown in Table 2.

[0053] Table 2

[0054] The above description is merely an embodiment of this application, and the scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for treating wastewater and cleaning fluid generated during cage grinding processes, characterized in that, Includes the following steps: (1) Add a magnetic suction rod to the wastewater and cleaning liquid generated by the grinding process, then add the pretreatment agent, stir and react for 20-30 minutes, and perform the first pressure filtration to remove larger impurities in the wastewater. (2) The pretreated wastewater in step (1) is transported to the wastewater tank. The wastewater treatment agent is mixed with water to obtain the wastewater treatment solution, which is then loaded into the solution tank. The wastewater treatment solution and wastewater are then transported to the mixing tank simultaneously. The first stirring is carried out in the mixing tank for 0.5-1h. Then, an oxidant is added to the mixing tank for the second stirring for 20-30min. (3) After the water treated in step (2) is filtered for the second time, it is sent to the sedimentation tank and left to stand in the sedimentation tank for 45-60 minutes to obtain the treated water.

2. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 1, characterized in that, The amount of the pretreatment agent added is 10-15 g / m³. 3 .

3. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 1, characterized in that, The dosage of the wastewater treatment agent is 32-40 g / m³. 3 .

4. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 1, characterized in that, Step (2) The stirring speed for the first stirring is 60-80 r / min; and / or Step (2) The stirring speed for the second stirring is 40-50 r / min.

5. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 1, wherein the amount of oxidant added is 2-4 g / m³. 3 .

6. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 1, characterized in that, The wastewater treatment agent comprises, by mass fraction: 10-20 parts polyacrylamide, 5-10 parts activated carbon, 10-15 parts modified chitosan, and 10-20 parts polyaluminum chloride. The modified chitosan was prepared by an addition reaction between chitosan and tetrachloro-1,4-benzoquinone.

7. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 1, characterized in that, The preparation method of the modified chitosan includes the following steps: S1: Add chitosan to an aqueous acetic acid solution, adjust the pH of the chitosan aqueous solution to 5.0-5.5 with an alkaline solution, and stir until completely dissolved to obtain a chitosan solution; S2: Add tetrachloro-1,4-benzoquinone to anhydrous ethanol, stir and mix evenly, then add dropwise to chitosan solution and stir to react under light-protected conditions; S3: After centrifugation or filtration, the precipitate is collected, repeatedly washed with water until the supernatant is colorless, and then freeze-dried to obtain modified chitosan.

8. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 7, characterized in that, In step S2, the reaction temperature is 30-50℃; the reaction time is 8-12h.

9. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 7, characterized in that, The molar ratio of chitosan to tetrachloro-1,4-benzoquinone is 1:(0.4-0.6).

10. The method for treating wastewater and cleaning fluid generated during the cage grinding process according to claim 7, characterized in that, The oxidant is peracetic acid.

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