Method for recycling wastewater generated by a cage grinding process
By using a combination of the first and second wastewater treatment agents, the problem of removing grease and metal ions from wastewater during cage grinding was solved, achieving efficient wastewater recycling and reuse, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG GOLDEN EMPIRE PRECISION MACHINERY TECH CO LTD
- Filing Date
- 2026-03-03
- Publication Date
- 2026-06-12
AI Technical Summary
Existing technologies are insufficient to effectively remove grease and metal ions from the complex wastewater generated during cage grinding, making it difficult to reuse the wastewater.
By employing the synergistic effect of the first and second wastewater treatment agents, and through a combination of polyacrylamide, polyaluminum chloride, cotton fiber, modified activated carbon, and diatomaceous earth, the pH value is adjusted and multiple stirring and sedimentation processes are carried out to remove impurities from the wastewater.
It significantly improved the clarity and usability of wastewater, reduced production costs, and achieved efficient recycling of wastewater.
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Abstract
Description
Technical Field
[0001] This application relates to a method for recycling wastewater generated during cage grinding processes, belonging to the field of industrial wastewater treatment technology. Background Technology
[0002] As a core structural component of rolling bearings, the manufacturing precision of the cage directly determines the bearing's rotational stability, fatigue life, and operating efficiency. With the development of technology, higher requirements have been placed on the precision of the cage. To achieve high precision, grinding the cage has become an important process. Grinding can optimize the surface roughness of the cage, calibrate its dimensional accuracy, improve its performance in subsequent use, and extend its service life.
[0003] However, when grinding cages, it is usually necessary to continuously rinse the cages with water to remove the grinding debris or impurities generated on the cages. This generates a large amount of wastewater, which is quite complex in composition, mainly containing abrasive particles, metal shavings (iron, aluminum, etc.), and fine dust. These particles are small in size and highly dispersed, making them difficult to remove by natural sedimentation. It also contains oily substances. In particular, when the cages are stretched, stretching oil is used for treatment. When rinsing with water during the grinding process, a large amount of oily substances are generated in the wastewater. These oily substances form a stable oil-water emulsion system in the wastewater, which is difficult to remove.
[0004] Chinese invention patent CN118598432B discloses a treatment process for mining sludge wastewater. The treatment system includes a water distribution tank, a reaction tank, and a sedimentation tank connected in sequence. The reaction tank is used to add flocculants for flocculation reaction. The flocculant is made from activated carbon as raw material, which generates metal oxides on its surface to form composite particles, and then modifies them with cashew phenol and aminothiophenol. In the above patent, complex components in wastewater are removed by using only a single flocculant. Although it can effectively remove fluoride, the wastewater generated by the grinding process does not only contain fluoride, but also many metal ions and oily substances. Using only the flocculant in the above patent cannot achieve wastewater reuse.
[0005] Therefore, there is a need for a wastewater recycling method that can effectively adsorb and remove impurities from a variety of complex components. Summary of the Invention
[0006] To address the aforementioned issues, a method for recycling wastewater generated during cage grinding is provided. This method effectively removes grease and metal ions from the wastewater. By using a first wastewater treatment agent and a second wastewater treatment agent in synergy, the impurity removal effect is optimized, allowing the treated water to be used in the cage grinding process, thereby improving water resource utilization and reducing production costs.
[0007] One aspect of this application provides a method for recycling wastewater generated during a cage grinding process, characterized by comprising the following steps: (1) The wastewater generated by the cage grinding process is first filtered to remove larger particles of impurities from the wastewater; (2) Transport the treated wastewater from step (1) into the wastewater tank, add pH adjuster to the wastewater tank, and adjust the pH of the wastewater to 7-8; (3) The first wastewater treatment agent is loaded into the first liquid tank, and then the first wastewater treatment agent and wastewater are simultaneously transported to the mixing tank and stirred for 45-60 minutes. (4) Put the second wastewater agent into the second liquid tank, and then add the second treatment agent to the water treated in step (3) and continue stirring for 20-30 minutes; (5) After the water treated in step (4) is filtered twice, it is sent to a sedimentation tank and left to stand in the sedimentation tank for 1-1.5 hours to obtain the treated water; The first wastewater treatment agent, by mass fraction, comprises: 3-6 parts polyacrylamide, 15-20 parts polyaluminum chloride, and 8-10 parts cotton fiber; The second wastewater treatment agent comprises, by mass fraction: 30-40 parts diatomaceous earth and 10-20 parts modified activated carbon; the modified activated carbon is obtained by modification with N-(2-aminoethyl)-3-aminopropyltriethoxysilane and trimethylmercaptophosphate.
[0008] In this application, the wastewater generated by the cage grinding process is subjected to a first-stage pressure filtration to initially remove larger metal particles and other impurities. Then, the pH of the wastewater is adjusted. By controlling the pH value, the dissolution of some metal ions is reduced, causing them to precipitate and reducing the heavy metal content in the wastewater. This initially optimizes the wastewater treatment effect and improves the wastewater treatment efficiency.
[0009] The polyacrylamide in the first wastewater treatment agent has a long molecular chain and a large number of amide groups. Through the bridging effect of the molecular chain, it connects the dispersed polyaluminum chloride flocs adsorbing impurities into large and dense flocs, significantly improving the settling speed and stability of the flocs and reducing suspended solids residue. After hydrolysis, polyaluminum chloride generates a large number of positively charged polynuclear hydroxy aluminum ions, which can quickly neutralize the negative charges of surfactants and oil colloids in wastewater and break the colloidal stability. The two work together to adsorb complex impurities in wastewater and improve the efficiency of impurity removal. Cotton fiber can effectively adsorb oil components. After the emulsion system in the wastewater is broken by polyacrylamide, the cotton fiber immediately adsorbs the oil, reducing its content in the wastewater. Through the synergy of the three, the components in the wastewater can be effectively removed.
[0010] The second wastewater treatment agent contains modified activated carbon and diatomaceous earth. The modified activated carbon contains functional groups such as amino and thiol groups, which can enhance the adsorption of emulsified oil or mineral oil, and can efficiently remove emulsified oil from wastewater. It also has a chelating effect on metal ions in wastewater, improving the adsorption effect of metal ions and oils. At the same time, the activated carbon itself has a porous structure, which can trap fine colloidal particles and remove suspended solids from wastewater.
[0011] The first and second wastewater treatment agents can work synergistically to remove harmful components from wastewater to the greatest extent possible, thereby improving the treatment effect and increasing the clarity of the treated water.
[0012] Optionally, the stirring speed in the mixing tank in step (3) is 40-50 r / min.
[0013] At this stirring speed, the first wastewater treatment agent can demulsify the grease emulsion system in the wastewater and quickly adsorb impurities such as grease and dust after demulsification. It can also timely complex metal ions to reduce the impurity content in the wastewater. If the stirring speed is too fast, the first wastewater treatment agent will have a short contact time with the wastewater and will be dispersed by the stirring device before it can adsorb or complex the impurities, thus reducing the impurity removal effect. If the treatment effect is too low, the first wastewater treatment agent will not be able to disperse quickly in the water, resulting in uneven wastewater treatment and affecting the final treatment effect of the wastewater.
[0014] Optionally, the stirring speed in the mixing tank in step (4) is 20-30 r / min.
[0015] At this stirring speed, the second wastewater treatment agent can adsorb smaller impurity particles in the wastewater. Diatomaceous earth and modified activated carbon themselves have a porous structure, which can further treat impurities that were not completely adsorbed or complexed by the first wastewater treatment agent. Since the particle size of the impurities is small at this time, if the stirring speed is too fast, the second wastewater treatment agent cannot adsorb the smaller impurities, resulting in an unsatisfactory wastewater treatment effect. If the stirring speed is too slow, it will not only affect the wastewater treatment effect, but also prolong the wastewater treatment time, making it impossible to apply the recovered water to the grinding process in a timely manner.
[0016] Optionally, the dosage of the first wastewater treatment agent is 50-60 g / m³. 3 .
[0017] At this dosage, the first wastewater treatment agent can adsorb and complex impurity particles in the wastewater, and the effect is good. If the dosage of the first wastewater treatment agent is too large, the removal of impurities will not be significantly improved, but will instead increase production costs and increase the manufacturing burden on enterprises. If the dosage of the first wastewater treatment agent is too small, its effect on removing impurities in wastewater will be unsatisfactory.
[0018] Optionally, the dosage of the second wastewater treatment agent is 30-40 g / m³. 3 .
[0019] At this dosage, the second wastewater treatment agent can efficiently remove impurities. Modified activated carbon and diatomaceous earth work together to remove impurities and can fully saturate and adsorb pollutants. If the dosage is too high, the removal of impurities will not be significantly improved, but will instead increase production costs and increase the manufacturing burden on enterprises. If the dosage is too low, its effect on removing impurities from wastewater will be unsatisfactory.
[0020] Optionally, the mass ratio of polyacrylamide to polyaluminum chloride is 1 (3-4).
[0021] At this ratio, polyaluminum chloride dissolves in water and hydrolyzes to form polynuclear aluminum hydroxy complexes, which disrupt the stability of colloidal particles in wastewater and cause them to form micro-floc nuclei. The amide groups on the polyacrylamide molecular chain can be adsorbed onto the surface of the micro-floc nuclei through hydrogen bonds and van der Waals forces. By utilizing the effect of long molecular chains, the dispersed micro-floc nuclei can form larger flocs, which are easier to remove in subsequent processes.
[0022] Optionally, the mass ratio of diatomaceous earth to modified activated carbon is 1:(2-3).
[0023] At this ratio, diatomaceous earth and modified activated carbon synergistically enhance the adsorption performance of heavy metal ions, anions, and organic matter. Diatomaceous earth has a honeycomb structure with multiple channels, large specific surface area, and high porosity. Its surface is rich in silanol groups, which can physically intercept suspended solids and colloidal particles in wastewater. The active groups such as diamine groups, mercapto groups, and phosphate esters contained on the activated carbon molecules bind to anionic pollutants and polar organic matter in wastewater through coordination bonds, hydrogen bonds, and electrostatic attraction. At the same time, the mercapto-phosphate dual site enhances the chelation ability of heavy metals and improves the impurity removal effect.
[0024] Optionally, the second wastewater treatment agent further includes chitosan quaternary ammonium salt.
[0025] Preferably, the amount of chitosan quaternary ammonium salt added is 6-10 parts.
[0026] Chitosan quaternary ammonium salts possess excellent adsorption properties, effectively adsorbing pollutants in water and improving adsorption efficiency. They synergistically work with modified activated carbon and diatomaceous earth to enhance the impurity removal effect of secondary wastewater treatment agents. Furthermore, chitosan quaternary ammonium salts exhibit antibacterial properties, inhibiting bacterial growth in water, reducing bacterial interference in the wastewater treatment process, and improving the quality of treated water.
[0027] Optionally, the modified activated carbon is prepared as follows: A1: Add activated carbon to an acidic solution, soak, filter and dry to obtain activated carbon; A2: Disperse the activated carbon in a solvent, then add N-(2-aminoethyl)-3-aminopropyltriethoxysilane, and stir at 60-70℃ for 2-3 hours to obtain activated carbon A; A3: Activated carbon A is dispersed in a solvent, then trimethyl mercaptophosphate is added and mixed evenly, and finally dried to obtain modified activated carbon.
[0028] Under the oxidation of acidic solution, activated carbon generates active groups such as hydroxyl and carboxyl groups on its surface. These active groups react with N-(2-aminoethyl)-3-aminopropyltriethoxysilane to introduce amino groups. The amino groups can complex with pollutants such as heavy metal ions in water, thereby removing them from wastewater. At the same time, the modification of activated carbon by N-(2-aminoethyl)-3-aminopropyltriethoxysilane improves the surface stability of activated carbon, reduces the loss of activated carbon during water treatment, and allows the modified activated carbon to maintain high adsorption performance during use. In addition, the introduction of siloxane groups on the surface of activated carbon improves its hydrophobicity and oleophilicity, enabling it to better remove impurities from wastewater.
[0029] In addition, modified activated carbon contains thiol groups, which have a strong affinity for heavy metal ions and can form stable sulfide chelates. Even if the concentration of metal ions in wastewater is low, it can still achieve the complexation of metal ions with impurities, further reducing the content of heavy metal ions in wastewater. Activated carbon also has the function of decolorization, which can clarify the treated wastewater, make it easier to recycle and reuse, and improve the utilization rate of water resources.
[0030] Optionally, the mass ratio of the activated carbon to N-(2-aminoethyl)-3-aminopropyltriethoxysilane is 1:(0.5-0.7).
[0031] At this ratio, N-(2-aminoethyl)-3-aminopropyltriethoxysilane can react with the hydroxyl groups on activated carbon, introducing amino groups onto the activated carbon. This allows the amino groups to be evenly dispersed in the wastewater along with the activated carbon, thus achieving uniform dispersion of the amino groups in the wastewater. This enables the activated carbon to not only have an adsorption function but also to remove heavy metal ions that are difficult to remove from the wastewater by forming complexes with the introduced amino groups.
[0032] Optionally, the mass ratio of the functionalized activated carbon to trimethyl mercaptophosphate is 1:(0.3-0.4).
[0033] At this ratio, functionalized activated carbon and trimethylmercaptophosphate can work synergistically. The functionalized activated carbon adsorbs colloidal impurities and oily substances, while the thiol groups in trimethylmercaptophosphate complex metal ions. Together, they improve the wastewater treatment effect.
[0034] The beneficial effects of this application include, but are not limited to: 1. The wastewater recycling method generated by the cage grinding process according to this application can effectively remove oily impurities and metal ions from the wastewater. The first wastewater treatment agent and the second wastewater treatment agent work together to optimize the impurity removal effect, so that the treated water can be used in the cage grinding process, thereby improving the utilization rate of water resources and reducing production costs.
[0035] 2. According to the wastewater recycling method of the cage grinding process of this application, the first wastewater treatment agent first demulsifies and adsorbs the grease in the wastewater and adsorbs and complexes the metal ions, and the second wastewater treatment agent further adsorbs and removes the residual metal ions and grease in the water after treatment by the first wastewater treatment agent, thereby improving the final treatment effect of the wastewater and enabling the treated wastewater to be directly used in the grinding process.
[0036] 3. According to the wastewater recycling method generated by the cage grinding process of this application, the polyacrylamide in the first wastewater treatment agent not only acts as a coagulant aid, enabling the colloid to flocculate rapidly, but also adsorbs the negative charge of diatomaceous earth in the second wastewater treatment agent through its positively charged groups, forming a tightly structured filter aid system, which is beneficial to the sedimentation of macromolecular substances.
[0037] 4. The wastewater recycling method generated by the cage grinding process according to this application contains a siloxane structure in the modified activated carbon, which can improve the hydrophobicity and oleophilicity of the modified activated carbon, thereby achieving the removal of oil components in the wastewater. At the same time, the modified activated carbon also contains mercapto groups, which can form complexation with heavy metal ions in the wastewater, further removing metal ions from the wastewater. Detailed Implementation
[0038] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.
[0039] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.
[0040] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.
[0041] The preparation methods of the first and second wastewater treatment agents in this application are both obtained by stirring and mixing the raw materials. The specific stirring and mixing method can be ball milling, grinding, etc. The mixing method does not limit the scheme of this application, and those skilled in the art can choose according to their needs or actual conditions.
[0042] 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 was 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.
[0043] In this application, the cotton fiber used is a commercially available product; the polyacrylamide is a cationic polyacrylamide with a molecular weight of 8 million and an ionicity of 20%; the activated carbon has a CAS number of 7440-44-0; the diatomaceous earth has a CAS number of 61790-53-2; the N-(2-aminoethyl)-3-aminopropyltriethoxysilane has a CAS number of 5089-72-5; the trimethyl mercaptophosphate has a CAS number of 152-18-1; the polyaluminum chloride has a CAS number of 101707-17-9; and the chitosan quaternary ammonium salt has a molecular weight of 2 × 10⁻⁶. 5 -3×10 5 The substitution rate is 80%.
[0044] Example 1 This embodiment relates to a method for recycling wastewater generated during a cage grinding process, comprising the following steps: (1) The wastewater generated by the cage grinding process is first filtered by a filter press to remove larger particles of impurities from the wastewater; (2) The treated wastewater in step (1) is transported to the wastewater tank. The pH of the wastewater is measured to be 9.2. Then, dilute hydrochloric acid is added to the wastewater tank to adjust the pH of the wastewater to 8. (3) Add 10 times the amount of water to the first wastewater treatment agent to form the first wastewater treatment solution, and pour it into the first solution tank. Then, simultaneously transport the first wastewater treatment solution and wastewater to the mixing tank, controlling the addition amount of the first wastewater treatment agent to be 50g / m³. 3 The mixture is stirred in a mixing tank at a stirring speed of 40 r / min for 45 min; the first wastewater treatment agent, by mass fraction, includes: 6 parts polyacrylamide, 20 parts polyaluminum chloride, and 10 parts cotton fiber. (4) Add the second wastewater treatment agent to 15 times the amount of water to form the second wastewater treatment solution, and then put it into the second solution tank. After that, add the second wastewater treatment solution to the water treated in step (3), and control the addition amount of the first wastewater treatment agent to 30g / m³. 3The stirring speed was 30 r / min, and stirring continued for 20 min. The second wastewater treatment agent, by mass fraction, included: 30 parts diatomaceous earth, 10 parts modified activated carbon, and 6 parts chitosan quaternary ammonium salt. The preparation method of the modified activated carbon is as follows: A1: Add activated carbon to 5 times the amount of 60wt% nitric acid solution, soak for 3 hours, filter and dry to obtain activated carbon; A2: Disperse the activated carbon in 3 times the amount of anhydrous ethanol, then add N-(2-aminoethyl)-3-aminopropyltriethoxysilane. The mass ratio of activated carbon to N-(2-aminoethyl)-3-aminopropyltriethoxysilane is 1:0.5. Stir at 60°C for 3 hours to obtain activated carbon A. A3: Activated carbon A is dispersed in anhydrous ethanol, then trimethyl mercaptophosphate is added and mixed evenly. The mass ratio of activated carbon A to trimethyl mercaptophosphate is 1:0.3. Finally, modified activated carbon is obtained by drying. (5) After the water treated in step (4) is filtered twice by a filter press, it is sent to a sedimentation tank and left to stand in the sedimentation tank for 1 hour to obtain the treated water.
[0045] Example 2 This embodiment relates to a method for recycling wastewater generated during a cage grinding process, comprising the following steps: (1) The wastewater generated by the cage grinding process is first filtered by a filter press to remove larger particles of impurities from the wastewater; (2) The treated wastewater in step (1) is transported to the wastewater tank. The pH of the wastewater is measured to be 9.4. Then, dilute hydrochloric acid is added to the wastewater tank to adjust the pH of the wastewater to 7. (3) Add 10 times the amount of water to the first wastewater treatment agent to form the first wastewater treatment solution, and pour it into the first solution tank. Then, simultaneously transport the first wastewater treatment solution and wastewater to the mixing tank, controlling the addition amount of the first wastewater treatment agent to be 60g / m³. 3 The mixture is stirred in a mixing tank at a stirring speed of 50 r / min for 60 min; the first wastewater treatment agent, by mass fraction, includes: 3 parts polyacrylamide, 10 parts polyaluminum chloride, and 8 parts cotton fiber. (4) Add the second wastewater treatment agent to 15 times the amount of water to form the second wastewater treatment solution, and then put it into the second solution tank. After that, add the second wastewater treatment solution to the water treated in step (3), and control the addition amount of the first wastewater treatment agent to 40g / m³. 3 The stirring speed was 20 r / min, and stirring continued for 30 min. The second wastewater treatment agent, by mass fraction, comprised: 40 parts diatomaceous earth, 20 parts modified activated carbon, and 10 parts chitosan quaternary ammonium salt. The preparation method of the modified activated carbon is as follows: A1: Add activated carbon to 5 times the amount of 60wt% nitric acid solution, soak for 3 hours, filter and dry to obtain activated carbon; A2: Disperse the activated carbon in 3 times the amount of anhydrous ethanol, then add N-(2-aminoethyl)-3-aminopropyltriethoxysilane. The mass ratio of activated carbon to N-(2-aminoethyl)-3-aminopropyltriethoxysilane is 1:0.7. Stir at 70°C for 2 hours to obtain activated carbon A. A3: Activated carbon A is dispersed in anhydrous ethanol, then trimethyl mercaptophosphate is added and mixed evenly. The mass ratio of activated carbon A to trimethyl mercaptophosphate is 1:0.4. Finally, the modified activated carbon is obtained by drying. (5) After the water treated in step (4) is filtered twice by a filter press, it is sent to a sedimentation tank and left to stand in the sedimentation tank for 1.5 hours to obtain the treated water.
[0046] Example 3 This embodiment relates to a method for recycling wastewater generated during a cage grinding process, comprising the following steps: (1) The wastewater generated by the cage grinding process is first filtered by a filter press to remove larger particles of impurities from the wastewater; (2) The treated wastewater in step (1) is transported to the wastewater tank. The pH of the wastewater is measured to be 8.6. Then sodium hydroxide is added to the wastewater tank to adjust the pH of the wastewater to 7.5. (3) Add 10 times the amount of water to the first wastewater treatment agent to form the first wastewater treatment solution, and pour it into the first solution tank. Then, simultaneously transport the first wastewater treatment solution and wastewater into the mixing tank, controlling the addition amount of the first wastewater treatment agent to be 55 g / m³. 3 The mixture is stirred in a mixing tank at a stirring speed of 45 r / min for 50 min; the first wastewater treatment agent, by mass fraction, includes: 4 parts polyacrylamide, 15 parts polyaluminum chloride, and 9 parts cotton fiber. (4) Add the second wastewater treatment agent to 15 times the amount of water to form the second wastewater treatment solution, and then put it into the second solution tank. After that, add the second wastewater treatment solution to the water treated in step (3), and control the addition amount of the first wastewater treatment agent to 35g / m³. 3 The stirring speed was 25 r / min, and stirring continued for 25 min. The second wastewater treatment agent, by mass fraction, comprised: 35 parts diatomaceous earth, 15 parts modified activated carbon, and 8 parts chitosan quaternary ammonium salt. The preparation method of the modified activated carbon is as follows: A1: Add activated carbon to 5 times the amount of 60wt% nitric acid solution, soak for 3 hours, filter and dry to obtain activated carbon; A2: Disperse the activated carbon in 3 times the amount of anhydrous ethanol, then add N-(2-aminoethyl)-3-aminopropyltriethoxysilane. The mass ratio of activated carbon to N-(2-aminoethyl)-3-aminopropyltriethoxysilane is 1:0.6. Stir at 65°C for 2.5 h to obtain activated carbon A. A3: Activated carbon A is dispersed in anhydrous ethanol, and then trimethyl mercaptophosphate is added and mixed evenly. The mass ratio of activated carbon A to trimethyl mercaptophosphate is 1:0.35. Finally, the modified activated carbon is obtained by drying. (5) After the water treated in step (4) is filtered twice by a filter press, it is sent to a sedimentation tank and left to stand in the sedimentation tank for 1.5 hours to obtain the treated water.
[0047] Example 4 The difference between this embodiment and embodiment 3 is that the stirring speed in the stirring tank in step (3) is 10 r / min, and the rest is the same as in embodiment 3.
[0048] Example 5 The difference between this embodiment and embodiment 3 is that the stirring speed in the stirring tank in step (4) is 60 r / min, and the rest is the same as in embodiment 3.
[0049] Example 6 The difference between this embodiment and embodiment 3 is that the amount of the first wastewater treatment agent added in step (3) is 100g / m³. 3 The rest is the same as in Example 3.
[0050] Example 7 The difference between this embodiment and embodiment 3 is that the amount of the second wastewater treatment agent added in step (4) is 10g / m³. 3 The rest is the same as in Example 3.
[0051] Example 8 The difference between this embodiment and embodiment 3 is that the amount of polymeric alumina added in step (3) is 18 parts, and the rest is the same as in embodiment 3.
[0052] Example 9 The difference between this embodiment and embodiment 3 is that the amount of modified activated carbon added to the second wastewater treatment agent in step (4) is 5 parts, and the rest is the same as in embodiment 3.
[0053] Example 10 The difference between this embodiment and Example 3 is that the modified activated carbon is prepared by directly mixing activated carbon, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, trimethyl mercaptophosphate and chitosan quaternary ammonium salt to obtain the modified activated carbon of the second wastewater treatment agent. The amount of modified activated carbon added is 10 parts, and the rest is the same as in Example 3.
[0054] Example 11 The difference between this embodiment and embodiment 3 is that chitosan quaternary ammonium salt is replaced with chitosan, while the rest is the same as in embodiment 3.
[0055] Comparative Example 1 The difference between this comparative example and Example 3 is that the first wastewater treatment agent is replaced with polyacrylamide, while the rest is the same as in Example 3.
[0056] Comparative Example 2 The difference between this comparative example and Example 3 is that the first wastewater treatment agent is replaced with polyaluminum chloride, while the rest is the same as in Example 3.
[0057] Comparative Example 3 The difference between this comparative example and Example 3 is that the modified activated carbon in the second wastewater treatment agent is replaced with activated carbon, while the rest is the same as in Example 3.
[0058] Comparative Example 4 The difference between this comparative example and Example 3 is that the amount of diatomaceous earth added in the second wastewater treatment agent is 10 parts, while the rest is the same as in Example 3.
[0059] Comparative Example 5 The difference between this comparative example and Example 3 is that the modified activated carbon in the second wastewater treatment agent is replaced with activated carbon A in step A2, and step A3 is not performed. The rest is the same as in Example 3.
[0060] Test Example 1 1) COD value test: The test method refers to HJ / T399-2007; 2) Suspended solids content test: The test method is in accordance with GB / T11901-1989; the specific test results are shown in Table 1.
[0061] Table 1
[0062] Test Example 2 1) Turbidity test: Take the water treated in Examples 1-11 and Comparative Examples 1-5 and test it with a turbidity meter; 2) Test of oil content in wastewater: Gravimetric method; using petroleum ether as the extraction solvent, the wastewater before treatment and the water after treatment in Examples 1-7 and Comparative Examples 1-4 were extracted by Soxhlet extractor, and the solvent was evaporated and dried before weighing. 3) pH test: Take the water treated in Examples 1-11 and Comparative Examples 1-5 and test the pH using a pH meter; the specific test results are shown in Table 2.
[0063] Table 2
[0064] 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 recycling wastewater generated during a cage grinding process, characterized in that, Includes the following steps: (1) The wastewater generated by the cage grinding process is first filtered to remove larger particles of impurities from the wastewater; (2) Transport the treated wastewater from step (1) into the wastewater tank, add pH adjuster to the wastewater tank, and adjust the pH of the wastewater to 7-8; (3) The first wastewater treatment agent is loaded into the first liquid tank, and then the first wastewater treatment agent and wastewater are simultaneously transported to the mixing tank and stirred for 45-60 minutes. (4) Put the second wastewater agent into the second liquid tank, and then add the second treatment agent to the water treated in step (3) and continue stirring for 20-30 minutes; (5) After the water treated in step (4) is filtered twice, it is sent to a sedimentation tank and left to stand in the sedimentation tank for 1-1.5 hours to obtain the treated water; The first wastewater treatment agent, by mass fraction, comprises: 3-6 parts polyacrylamide, 10-20 parts polyaluminum chloride, and 8-10 parts cotton fiber; The second wastewater treatment agent comprises, by mass fraction: 30-40 parts diatomaceous earth and 10-20 parts modified activated carbon; the modified activated carbon is obtained by modification with N-(2-aminoethyl)-3-aminopropyltriethoxysilane and trimethylmercaptophosphate.
2. The method for recycling wastewater generated during the cage grinding process according to claim 1, characterized in that, In step (3), the stirring speed in the mixing tank is 40-50 r / min; and / or In step (4), the stirring speed in the mixing tank is 20-30 r / min.
3. The method for recycling wastewater generated during the cage grinding process according to claim 1, characterized in that, The dosage of the first wastewater treatment agent is 50-60 g / m³. 3 .
4. The method for recycling wastewater generated during the cage grinding process according to claim 1, characterized in that, The dosage of the second wastewater treatment agent is 30-40 g / m³. 3 .
5. The method for recycling wastewater generated during the cage grinding process according to claim 1, characterized in that, The mass ratio of polyacrylamide to polyaluminum chloride is 1 (3-4).
6. The method for recycling wastewater generated during the cage grinding process according to claim 1, characterized in that, The mass ratio of modified activated carbon to diatomaceous earth is 1:(2-3).
7. The method for recycling wastewater generated during the cage grinding process according to claim 1, characterized in that, The second wastewater treatment agent also includes chitosan quaternary ammonium salt, wherein the amount of chitosan quaternary ammonium salt added is 6-10 parts.
8. The method for recycling wastewater generated during the cage grinding process according to claim 7, characterized in that, The modified activated carbon is prepared as follows: A1: Add activated carbon to an acidic solution, soak, filter and dry to obtain activated carbon; A2: Disperse the activated carbon in a solvent, then add N-(2-aminoethyl)-3-aminopropyltriethoxysilane, and stir at 60-70℃ for 2-3 hours to obtain activated carbon A; A3: Activated carbon A is dispersed in a solvent, then trimethyl mercaptophosphate is added and mixed evenly, and finally dried to obtain modified activated carbon.
9. The method for recycling wastewater generated during the cage grinding process according to claim 8, characterized in that, The mass ratio of activated carbon to N-(2-aminoethyl)-3-aminopropyltriethoxysilane is 1:(0.5-0.7).
10. The method for recycling wastewater generated during the cage grinding process according to claim 8, characterized in that, The mass ratio of activated carbon A to trimethyl mercaptophosphate is 1:(0.3-0.4).