Water treatment process after cleaning of deep groove ball retainer
The water treatment process after cleaning with a deep groove ball retainer utilizes wastewater treatment agents composed of polyacrylamide, polyaluminum chloride, etc., to remove heavy metal ions and grease from wastewater, solving the problem of high COD in wastewater and improving water resource utilization and treatment efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG GOLDEN EMPIRE PRECISION MACHINERY TECH CO LTD
- Filing Date
- 2026-01-28
- Publication Date
- 2026-05-12
AI Technical Summary
The wastewater generated by the existing deep groove ball retainer cleaning process contains heavy metal ions, dust and other impurities and grease, resulting in high COD concentrations that are difficult to meet discharge and reuse requirements.
A water treatment process using a deep groove ball retainer after cleaning includes primary filtration, pH adjustment, addition of wastewater treatment agent and stirring reaction, refiltration and sedimentation. The wastewater treatment agent is composed of polyacrylamide, polyaluminum chloride, modified cotton fiber, diatomaceous earth and activated carbon, which removes heavy metal ions and grease from the wastewater through flocculation, adsorption and sedimentation.
It effectively removes heavy metal ions and oils from wastewater, reduces COD levels, improves water clarity, enables wastewater recycling, and lowers production costs.
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Abstract
Description
Technical Field
[0001] This application relates to a water treatment process after cleaning a deep groove ball retainer, belonging to the field of wastewater treatment technology. Background Technology
[0002] During the cage manufacturing process, metal shavings and dust are easily present on the surface. In order to avoid scratches, tears and other defects on the cage surface, stretching oil is usually added to perform a stretching operation. Therefore, the surface of the cage will not only be covered with metal shavings and dust, but also some stretching oil will remain. In order to meet the cleanliness of the final product, it is necessary to remove metal particles, impurities and residual stretching oil from the surface of the cage through a cleaning process.
[0003] Currently, the cleaning process for deep groove ball cages mainly employs water washing, high-pressure spray cleaning, or a combination of methods integrating ultrasonic cleaning. This cleaning process generates a large amount of wastewater containing contaminants, and its composition is relatively complex. The main characteristic contaminants include: first, recalcitrant organic stretching oil, which forms a stable emulsion under the action of surfactants, making it difficult to separate by simple physical methods; and second, impurities such as metal debris and dust generated during cage manufacturing, which include both small heavy metal ions and large metal particles. Due to the complex composition of the wastewater generated by the cleaning process, the COD concentration in the wastewater is usually high, failing to meet discharge and reuse requirements. Therefore, the wastewater needs to be treated to meet discharge or reuse standards.
[0004] Chinese invention patent CN120058172B discloses a method for treating chemical wastewater. The method involves filtering and removing impurities from the chemical wastewater, adding polyacrylamide, zeolite powder, polyaluminum chloride, and activated carbon, and performing a first stirring treatment. Then, a wastewater treatment agent is added, and the mixture is stirred a second time under ultraviolet light, followed by filtration to obtain the treated wastewater. In the aforementioned patent, both stirring treatments target the adsorption or complexation of dust or heavy metal ions in the wastewater to remove heavy metals or some dust. However, wastewater often contains a large amount of grease, which affects the subsequent utilization of the wastewater and easily adsorbs other toxic and harmful substances, thus exacerbating the pollution level of the water body.
[0005] Therefore, there is an urgent need for a water treatment process that can remove both heavy metal ions, dust and other impurities from wastewater, as well as grease, after cleaning with a deep groove ball retainer. Summary of the Invention
[0006] To address the aforementioned issues, a water treatment process for cleaning deep groove ball retainers is provided. This process can remove heavy metal ions and stretching oil from wastewater, reduce the COD value and impurity content in the wastewater generated during the cleaning process, clarify the water, enable recycling, improve water resource utilization, and reduce production costs.
[0007] One aspect of this application provides a water treatment process after cleaning a deep groove ball retainer, comprising the following steps: (1) The wastewater generated after cleaning the deep groove ball retainer is filtered once to remove larger 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) Load the wastewater treatment agent into the liquid tank, and then simultaneously transport the wastewater treatment agent and wastewater into the mixing tank and stir and react in the mixing tank for 45-60 minutes; (4) After the water treated in step (3) is filtered twice, it is sent to a sedimentation tank, and 0.05-0.1wt‰ sodium hypochlorite is added. The water is left to stand in the sedimentation tank for 1-2 hours to obtain the treated water. The wastewater treatment agent, by weight fraction, includes: 1-2 parts polyacrylamide, 6-10 parts polyaluminum chloride, 5-8 parts modified cotton fiber, 20-30 parts diatomaceous earth, and 30-40 parts activated carbon. The modified cotton fiber was obtained by modification with fluorinated silane and diphenylmethane diisocyanate.
[0008] This application uses a deep groove ball retainer to filter the wastewater generated after cleaning, initially removing 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] By adding wastewater treatment agents, grease and metal ions in the wastewater are further adsorbed and removed. Both polyacrylamide and polyaluminum chloride in the wastewater treatment agents disrupt emulsion equilibrium, achieving a demulsification effect, causing surfactants, base oils, and other components in the stretching oil to coagulate into flocculent precipitates and separate. After hydrolysis, polyaluminum chloride generates a large number of positively charged polynuclear aluminum hydroxyl ions, which can quickly neutralize the negative charges of surfactants and oil colloids in the wastewater, breaking the colloidal stability. Simultaneously, the aluminum hydroxide colloids formed by the hydrolysis products have strong adsorption properties, adsorbing suspended impurities and tiny oil droplets, promoting their coagulation into fine flocs.
[0010] Polyacrylamide has long molecular chains and a large number of amide groups. Through the bridging effect of molecular chains, it connects dispersed polyaluminum chloride flocs that adsorb impurities into large and dense flocs, which significantly improves the settling speed and stability of the flocs, reduces suspended solids residue, and not only removes metal ions and oils, but also ensures the clarification effect of wastewater.
[0011] Diatomaceous earth has a honeycomb-like porous structure with uniform pore size distribution, which can directly trap suspended impurities in wastewater, remove suspended solids that cause turbidity, and reduce effluent turbidity. Simultaneously, diatomaceous earth can also trap oil droplets that precipitate after demulsification, improving oil removal efficiency. Activated carbon has an ultra-large specific surface area and abundant surface functional groups, enabling it to adsorb small-molecule organic matter in wastewater. Activated carbon also has decolorizing and deodorizing effects, effectively removing colloidal pigments from wastewater. The synergistic effect of diatomaceous earth and activated carbon enhances the removal of various impurities in wastewater, improving the clarity of the treated wastewater. Furthermore, the silanol groups on the surface of diatomaceous earth can adsorb colloidal particles in the water and act as nuclei to promote the formation of larger flocs of polyaluminum chloride, increasing settling velocity and further improving wastewater treatment.
[0012] By reacting the hydroxyl groups on cotton fibers with fluorinated silanes, a structure containing long-chain fluoroalkyl groups is introduced, reducing the water absorption of the modified wood fibers and thus improving their oil absorption. The remaining hydroxyl groups on the cotton fibers can also react with the isocyanate groups on the diphenylmethane diisocyanate molecule to form stable carbamate bonds. Simultaneously, phenyl groups are introduced, further enhancing the hydrophobicity of the modified cotton fibers, improving their oil absorption, and increasing their oil removal efficiency from wastewater.
[0013] Adding sodium hypochlorite to the sedimentation tank can not only sterilize and disinfect the water, but also effectively remove the odor of some organic components and improve the quality of wastewater treatment.
[0014] Optionally, the stirring speed in the mixing tank in step (1) is 40-50 r / min.
[0015] At this stirring speed, the complexation of wastewater treatment agents with metal ions, adsorption of dust and impurities, and flocculation effects in wastewater can be effectively improved, thus increasing wastewater treatment efficiency. If the stirring speed is too fast, the flocs formed by the wastewater treatment agent cannot settle due to continuous rapid stirring, resulting in a reduction in the treatment effect of the wastewater treatment agent; if the stirring speed is too slow, the wastewater treatment agent cannot quickly and extensively contact the wastewater, thus failing to function effectively and affecting wastewater treatment efficiency.
[0016] Optionally, the pH adjuster is at least one of calcium hydroxide, sodium hydroxide, nitric acid, and oxalic acid.
[0017] Optionally, the dosage of the wastewater treatment agent is 40-50 g / m³. 3.
[0018] At this dosage, the wastewater treatment effect can be maximized, the wastewater treatment agent can be avoided, and the residual amount of wastewater treatment agent in the treated water can be reduced, thereby affecting the quality of the treated water.
[0019] Optionally, the weight ratio of polyacrylamide to modified cotton fiber is 1:(3-4).
[0020] At this weight ratio, polyacrylamide disrupts the emulsification balance of surfactants, causing oil phase and colloidal particles to precipitate. Modified cotton fibers can adsorb floating oil precipitated by polyacrylamide and oil droplets after demulsification in wastewater. The two work together to improve the removal of stretching oil in wastewater and reduce the oil content in the treated water.
[0021] Optionally, the weight ratio of polyaluminum chloride to activated carbon is 1:(4-5).
[0022] At this ratio, polyaluminum chloride hydrolyzes to generate positively charged polynuclear hydroxyaluminum ions, forming flocculent nuclei that can quickly neutralize the negative charges of surfactants and oil phases in wastewater, forming micro-flocs and improving the stability of the flocculent nuclei. The porous structure of activated carbon can adsorb micro-particles and metal ions in the flocs, enhancing the flocculation effect. The synergistic effect of both can improve the removal rate and effect of metal ions and oil impurities in wastewater, further improving the quality of the treated wastewater.
[0023] Optionally, the modified cotton fiber is prepared as follows: A1: After soaking cotton fibers in a solvent, a cotton fiber suspension is obtained; A2: Add hydrogen peroxide to the cotton fiber suspension, then filter and dry to obtain pretreated cotton fibers; A3: Dissolve the pretreated cotton fibers in a solvent, then add fluorinated silane and acid-binding agent, react at 50-70℃ for 1-2 hours, and obtain cotton fiber A after cooling and drying; A4: Add cotton fiber A to a solvent, then add diphenylmethane diisocyanate and dibutyltin dilaurate. Under an inert gas atmosphere, heat to 60-70℃, stir and mix for 1-2 hours, and then cool and dry to obtain modified cotton fiber.
[0024] Hydrogen peroxide treatment introduces active groups such as hydroxyl and carboxyl groups onto the surface of cotton fibers. Then, fluorinated silanes are added to introduce long-chain fluoroalkyl structures onto the cotton fiber surface, effectively improving the hydrophobicity and oleophilicity of the modified cotton fibers, thereby increasing the adsorption rate of oils in wastewater. Subsequently, the residual hydroxyl groups on the cotton fiber surface react with diphenylmethane diisocyanate to form urethane bonds and introduce phenyl groups, further enhancing the hydrophobic and degreasing effects of the modified cotton fibers.
[0025] Optionally, the concentration of the cotton fiber suspension is 1-1.5%.
[0026] Optionally, the weight ratio of the pretreated cotton fibers to the fluorinated silane is 1:(0.2-0.4).
[0027] At this ratio, some hydroxyl groups in the pretreated cotton fiber react with fluorinated silanes, thereby introducing a long-chain fluoroalkane structure, which improves the hydrophobic and oil-absorbing effect of cotton fiber A. At the same time, some hydroxyl groups will remain in cotton fiber A for subsequent reaction with diphenylmethane diisocyanate.
[0028] Optionally, the fluorinated silane includes one of perfluorododecyltrichlorosilane, perfluorooctyltrichlorosilane, and perfluorodecyltrichlorosilane.
[0029] Fluorinated silanes contain long-chain alkyl groups and fluorine, which can improve the hydrophobic and oleophilic properties of cotton fibers, thereby improving the removal of grease from wastewater, enhancing the quality of treated wastewater, and enabling better recycling.
[0030] Preferably, the fluorinated silane is perfluorododecyltrichlorosilane.
[0031] Optionally, the weight ratio of cotton fiber A to diphenylmethane diisocyanate is 1:(2-3).
[0032] At this ratio, cotton fiber A can react with diphenylmethane diisocyanate under the action of dibutyltin dilaurate, causing the isocyanate to react with hydroxyl groups to form urethane bonds. This not only improves the hydrophobicity and oleophilicity of the modified cotton fiber, but also improves its corrosion resistance, thereby enhancing its treatment effect in sewage. Even in sewage treated with highly corrosive aluminum castings, it can still exert a good decontamination effect.
[0033] Optionally, the amount of dibutyltin dilaurate added is 0.1-0.3% of the total weight of cotton fiber A and diphenylmethane diisocyanate.
[0034] Optionally, the wastewater treatment agent is prepared as follows: S1: Mix diatomaceous earth, activated carbon and polyaluminum chloride at 25-35℃ for 20-30 minutes to obtain mixture A; S2: Mix modified cotton fiber and polyacrylamide at 25-35℃ for 10-20 minutes to obtain mixture B; S3: Mix mixture A and mixture B for 5-10 minutes, then granulate and dry to obtain the wastewater treatment agent.
[0035] The beneficial effects of this application include, but are not limited to: 1. The water treatment process after cleaning the deep groove ball retainer according to this application can remove heavy metal ions from the wastewater and also remove stretching oil, reduce the COD value and impurity content in the wastewater generated by the cleaning process, clarify the water, enable recycling, improve water resource utilization, and reduce production costs.
[0036] 2. According to the water treatment process after cleaning the deep groove ball retainer of this application, by adding a sewage treatment agent, the grease and metal ions in the sewage can be adsorbed and removed. The polyacrylamide and polyaluminum chloride in the sewage treatment agent have the technical effect of disrupting the emulsion balance and achieving demulsification, so that the surfactants, base oils and other components in the stretching oil are condensed into flocculent precipitates and separated.
[0037] 3. According to the water treatment process after cleaning the deep groove ball retainer of this application, the sewage treatment agent also contains modified cotton fiber, which contains long-chain fluoroalkyl structure, phenyl structure and urethane bond. The three synergistically improve the hydrophobicity of the modified wood fiber, enhance the oil absorption effect, and thus improve the impurity removal effect of sewage. 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. The filtration methods in this application are common filtration methods in the art, and those skilled in the art can choose them according to their needs. They can also use a filter press for filtration. The filtration method does not limit the solution of this application.
[0041] The polyacrylamide used in the embodiments of this application is cationic polyacrylamide with a molecular weight of 8 million and an ionic degree of 20%; polyaluminum chloride CAS number: 101707-17-9; diphenylmethane diisocyanate CAS number: 101-68-8; perfluorododecyltrichlorosilane CAS number: 78560-44-8; perfluorooctyltrichlorosilane CAS number: 78560-45-9; perfluorodecyltrichlorosilane CAS number: 78560-44-8.
[0042] Example 1 This embodiment relates to a water treatment process after cleaning a deep groove ball retainer, including the following steps: (1) The wastewater generated after cleaning the deep groove ball retainer is filtered once in a filter press to remove larger 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 6.1. Then sodium hydroxide is added to the wastewater tank to adjust the pH of the wastewater to 7. (3) Add the wastewater treatment agent to 20 times the amount of water to form a solution, pour it into the solution tank, and then simultaneously transfer the solution and wastewater to the mixing tank, controlling the addition amount of wastewater treatment agent to 40g / m³. 3 The mixture was stirred in a mixing tank for 45 minutes at a stirring speed of 50 r / min. (4) After the water treated in step (3) is filtered twice by a filter press, it is sent to a sedimentation tank. The filter cake after filtration is sent to a designated institution for recycling. 0.05wt‰ sodium hypochlorite is added to the sedimentation tank and left to stand for 2 hours to obtain the treated water. The wastewater treatment agent, by weight fraction, comprises: 2 parts polyacrylamide (molecular weight of 8 million), 6 parts polyaluminum chloride, 8 parts modified cotton fiber, 20 parts diatomaceous earth, and 30 parts activated carbon. The preparation method of the wastewater treatment agent is as follows: S1: Mix 20 parts of diatomaceous earth, 30 parts of activated carbon and 6 parts of polyaluminum chloride at 25°C for 30 minutes to obtain mixture A; S2: Mix 8 parts of modified cotton fiber and 2 parts of polyacrylamide at 25°C for 10-20 minutes to obtain mixture B; the preparation method of the modified cotton fiber is as follows: A1: After soaking cotton fibers in water, a cotton fiber suspension with a concentration of 1% is obtained; A2: Add 15wt% hydrogen peroxide to the cotton fiber suspension, then filter and dry to obtain pretreated cotton fibers; A3: Dissolve the pretreated cotton fibers in 10 times the amount of water, then add perfluorooctyltrichlorosilane and sodium bicarbonate and react at 50°C for 2 hours. The weight ratio of the pretreated cotton fibers, perfluorooctyltrichlorosilane and sodium bicarbonate is 1:0.2:0.3. After cooling and drying, cotton fiber A is obtained. A4: Add 5 times the amount of acetone to cotton fiber A, then add diphenylmethane diisocyanate and dibutyltin dilaurate. The weight ratio of cotton fiber A to diphenylmethane diisocyanate is 1:2. The amount of dibutyltin dilaurate added is 0.1% of the total weight of cotton fiber A and diphenylmethane diisocyanate. Under a nitrogen atmosphere, heat to 70°C, stir and mix for 2 hours, cool and dry to obtain modified cotton fiber. S3: Mix mixture A and mixture B for 10 minutes, then granulate and dry to obtain the wastewater treatment agent.
[0043] Example 2 This embodiment relates to a water treatment process after cleaning a deep groove ball retainer, including the following steps: (1) The wastewater generated after cleaning the deep groove ball retainer is filtered once in a filter press to remove larger 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 6.1. Then sodium hydroxide is added to the wastewater tank to adjust the pH of the wastewater to 8. (3) Add the wastewater treatment agent to 20 times the amount of water to form a solution, pour it into the solution tank, and then simultaneously transfer the solution and wastewater to the mixing tank, controlling the addition amount of wastewater treatment agent to 50g / m³. 3 The mixture was stirred in a mixing tank for 60 minutes at a stirring speed of 40 r / min. (4) After the water treated in step (3) is filtered twice by a filter press, it is sent to a sedimentation tank. The filter cake after filtration is sent to a designated institution for recycling. 0.1 wt‰ sodium hypochlorite is added to the sedimentation tank and left to stand in the sedimentation tank for 1 hour to obtain the treated water. The wastewater treatment agent, by weight fraction, comprises: 1 part polyacrylamide (molecular weight 12 million), 10 parts polyaluminum chloride, 3 parts modified cotton fiber, 30 parts diatomaceous earth, and 40 parts activated carbon. The preparation method of the wastewater treatment agent is as follows: S1: Mix 30 parts of diatomaceous earth, 40 parts of activated carbon and 10 parts of polyaluminum chloride at 35°C for 20 minutes to obtain mixture A; S2: Mix 3 parts modified cotton fiber and 1 part polyacrylamide at 35°C for 10 minutes to obtain mixture B; the preparation method of the modified cotton fiber is as follows: A1: After soaking cotton fibers in water, a cotton fiber suspension with a concentration of 1.5% is obtained; A2: Add 15wt% hydrogen peroxide to the cotton fiber suspension, then filter and dry to obtain pretreated cotton fibers; A3: Dissolve the pretreated cotton fibers in 10 times the amount of water, then add perfluorodecyltrichlorosilane and sodium bicarbonate and react at 70°C for 1 hour. The weight ratio of the pretreated cotton fibers, perfluorodecyltrichlorosilane and sodium bicarbonate is 1:0.4:0.5. After cooling and drying, cotton fiber A is obtained. A4: Add 5 times the amount of acetone to cotton fiber A, then add diphenylmethane diisocyanate and dibutyltin dilaurate. The weight ratio of cotton fiber A to diphenylmethane diisocyanate is 1:3. The amount of dibutyltin dilaurate added is 0.3% of the total weight of cotton fiber A and diphenylmethane diisocyanate. Under a nitrogen atmosphere, heat to 60°C, stir and mix for 1 hour, cool and dry to obtain modified cotton fiber. S3: Mix mixture A and mixture B for 5 minutes, then granulate and dry to obtain the wastewater treatment agent.
[0044] Example 3 This embodiment relates to a water treatment process after cleaning a deep groove ball retainer, including the following steps: (1) The wastewater generated after cleaning the deep groove ball retainer is filtered once in a filter press to remove larger impurities from the wastewater; (2) The treated wastewater in step (1) is transported to the wastewater tank and the pH of the wastewater is detected to be 6.1. Then sodium hydroxide is added to the wastewater tank to adjust the pH of the wastewater to 7.5. (3) Add the wastewater treatment agent to 20 times the amount of water to form a solution, pour it into the solution tank, and then simultaneously transfer the solution and wastewater to the mixing tank, controlling the addition amount of wastewater treatment agent to 50g / m³. 3 The mixture was stirred in a mixing tank for 45 minutes at a stirring speed of 45 r / min. (4) The water treated in step (3) is filtered twice by a filter press and then sent to a sedimentation tank. The filter cake after filtration is sent to a designated institution for recycling. 0.08wt‰ sodium hypochlorite is added to the sedimentation tank and left to stand in the sedimentation tank for 1.5h to obtain the treated water. The wastewater treatment agent, by weight fraction, comprises: 1.5 parts polyacrylamide (molecular weight of 10 million), 8 parts polyaluminum chloride, 5 parts modified cotton fiber, 25 parts diatomaceous earth, and 35 parts activated carbon. The preparation method of the wastewater treatment agent is as follows: S1: Mix diatomaceous earth, activated carbon and polyaluminum chloride at 30°C for 25 minutes to obtain mixture A; S2: Modified cotton fiber and polyacrylamide are stirred and mixed at 30°C for 15 minutes to obtain mixture B; the preparation method of the modified cotton fiber is as follows: A1: After soaking cotton fibers in water, a cotton fiber suspension with a concentration of 1.2% is obtained; A2: Add 15wt% hydrogen peroxide to the cotton fiber suspension, then filter and dry to obtain pretreated cotton fibers; A3: Dissolve the pretreated cotton fibers in 10 times the amount of water, then add perfluorododecyltrichlorosilane and sodium bicarbonate and react at 60°C for 1.5 h. The weight ratio of the pretreated cotton fibers, perfluorododecyltrichlorosilane and sodium bicarbonate is 1:0.3:0.4. After cooling and drying, cotton fiber A is obtained. A4: Add 5 times the amount of acetone to cotton fiber A, then add diphenylmethane diisocyanate and dibutyltin dilaurate. The weight ratio of cotton fiber A to diphenylmethane diisocyanate is 1:2.5. The amount of dibutyltin dilaurate added is 0.2% of the total weight of cotton fiber A and diphenylmethane diisocyanate. Under a nitrogen atmosphere, heat to 65°C, stir and mix for 1.5 hours, cool and dry to obtain modified cotton fiber. S3: Mix mixture A and mixture B for 8 minutes, then granulate and dry to obtain the wastewater treatment agent.
[0045] Example 4 The difference between this embodiment and Embodiment 3 is that the amount of polyacrylamide added is 0.5 parts, while the rest is the same as in Embodiment 3.
[0046] Example 5 The difference between this embodiment and embodiment 3 is that the amount of polyaluminum chloride added is 15 parts, while the rest is the same as in embodiment 3.
[0047] Example 6 The difference between this embodiment and Example 3 is that the modified cotton fiber is prepared by directly mixing cotton fiber with perfluorododecyltrichlorosilane and diphenylmethane diisocyanate, while the rest is the same as in Example 3.
[0048] Example 7 The difference between this embodiment and Embodiment 3 is that perfluorododecyltrichlorosilane in step A3 is replaced with trifluoropropyltrichlorosilane, while the rest is the same as in Embodiment 3.
[0049] Comparative Example 1 The difference between this comparative example and Example 3 is that the modified cotton fiber in the wastewater treatment agent is replaced with cotton fiber, while the rest is the same as in Example 3.
[0050] Comparative Example 2 The difference between this comparative example and Example 3 is that the amount of modified cotton fiber added to the wastewater treatment agent is 1 part, while the rest is the same as in Example 3.
[0051] Comparative Example 3 The difference between this comparative example and Example 3 is that the stirring reaction time in step (3) is 20 min, while the rest is the same as in Example 3.
[0052] Comparative Example 4 The difference between this comparative example and Example 3 is that the stirring reaction time in step (3) is 4 hours, while the rest is the same as in Example 3.
[0053] 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.
[0054] Table 1
[0055] Test Example 2 1) Turbidity testing: A turbidimeter is used for testing; 2) Test of oil content in wastewater: gravimetric method; petroleum ether was used as the extraction solvent. Wastewater before treatment and water after treatment in Examples 1-7 and Comparative Examples 1-4 were extracted using a Soxhlet extractor. After evaporating and drying the solvent, the samples were weighed. The specific test results are shown in Table 2.
[0056] Table 2
[0057] 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 water treatment process after cleaning a deep groove ball retainer, characterized in that, The processing technology includes the following steps: (1) The wastewater generated after cleaning the deep groove ball retainer is filtered once to remove larger 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) Load the wastewater treatment agent into the liquid tank, and then simultaneously transport the wastewater treatment agent and wastewater into the mixing tank and stir and react in the mixing tank for 45-60 minutes; (4) After the water treated in step (3) is filtered twice, it is sent to a sedimentation tank, and 0.05-0.1wt‰ sodium hypochlorite is added. The water is left to stand in the sedimentation tank for 1-2 hours to obtain the treated water. The wastewater treatment agent, by weight fraction, includes: 1-2 parts polyacrylamide, 6-10 parts polyaluminum chloride, 3-8 parts modified cotton fiber, 20-30 parts diatomaceous earth, and 30-40 parts activated carbon. The modified cotton fiber was obtained by modification with fluorinated silane and diphenylmethane diisocyanate.
2. The water treatment process after cleaning the deep groove ball retainer according to claim 1, characterized in that, In step (3), the stirring speed in the mixing tank is 40-50 r / min; and / or The pH adjuster is at least one of calcium hydroxide, sodium hydroxide, nitric acid, and oxalic acid.
3. The water treatment process after cleaning the deep groove ball retainer according to claim 1, characterized in that, The dosage of the wastewater treatment agent is 40-50 g / m³. 3 .
4. The water treatment process after cleaning the deep groove ball retainer according to claim 1, characterized in that, The weight ratio of polyacrylamide to modified cotton fiber is 1:(3-4).
5. The water treatment process after cleaning the deep groove ball retainer according to claim 1, characterized in that, The weight ratio of polyaluminum chloride to activated carbon is 1:(4-5).
6. The water treatment process after cleaning the deep groove ball retainer according to claim 1, characterized in that, The method for preparing the modified cotton fiber is as follows: A1: After soaking cotton fibers in a solvent, a cotton fiber suspension is obtained; A2: Add hydrogen peroxide to the cotton fiber suspension, then filter and dry to obtain pretreated cotton fibers; A3: Dissolve the pretreated cotton fibers in a solvent, then add fluorinated silane and acid-binding agent, react at 50-70℃ for 1-2 hours, and obtain cotton fiber A after cooling and drying; A4: Add cotton fiber A to a solvent, then add diphenylmethane diisocyanate and dibutyltin dilaurate. Under an inert gas atmosphere, heat to 60-70℃, stir and mix for 1-2 hours, and then cool and dry to obtain modified cotton fiber.
7. The water treatment process after cleaning the deep groove ball retainer according to claim 6, characterized in that, The concentration of the cotton fiber suspension is 1-1.5%; and / or The weight ratio of the pretreated cotton fibers to the fluorinated silane is 1:(0.2-0.4).
8. The water treatment process after cleaning the deep groove ball retainer according to claim 6, characterized in that, The fluorinated silane includes one of perfluorododecyltrichlorosilane, perfluorooctyltrichlorosilane, and perfluorodecyltrichlorosilane.
9. The water treatment process after cleaning the deep groove ball retainer according to claim 6, characterized in that, The weight ratio of cotton fiber A to diphenylmethane diisocyanate is 1:(2-3).
10. The water treatment process after cleaning the deep groove ball retainer according to any one of claims 1-9, characterized in that, The wastewater treatment agent is prepared as follows: S1: Mix diatomaceous earth, activated carbon and polyaluminum chloride at 25-35℃ for 20-30 minutes to obtain mixture A; S2: Mix modified cotton fiber and polyacrylamide at 25-35℃ for 10-20 minutes to obtain mixture B; S3: Mix mixture A and mixture B for 5-10 minutes, then granulate and dry to obtain the wastewater treatment agent.