High-efficiency sludge dewatering agent and preparation method thereof
This highly efficient sludge dewatering agent, composed of modified polyacrylamide and modifiers, utilizes the flocculation effect of mesoporous SiO2 and chitosan, combined with the flocculation and sterilization functions of modified polyacrylamide, to solve the problems of sludge dewatering and sterilization, achieving highly efficient dewatering and sterilization effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KAIWEIER ENVIRONMENTAL PROTECTION MATERIALS CO LTD
- Filing Date
- 2025-09-10
- Publication Date
- 2026-05-22
Smart Images
Figure BDA0005589777460000091
Abstract
Description
Technical Field
[0001] This invention belongs to the field of polymer materials technology, specifically relating to a high-efficiency sludge dewatering agent and its preparation method. Background Technology
[0002] With the rapid development of my country's social economy, the discharge of domestic sewage and industrial wastewater has continued to increase, and a large amount of sludge is generated during the sewage treatment process. This sludge is a complex heterogeneous body composed of organic fragments, bacterial cells, inorganic particles, colloids, etc. It has a special morphology, with small particles that are mostly flocculent, low density, and high water content. It is a thick substance between liquid and solid and can be transported by pumps, but it is difficult to separate solids and liquids through sedimentation.
[0003] To improve sludge dewatering performance, sludge dewatering agents are often added during the dewatering process for flocculation and dewatering. Sludge dewatering agents work by changing the physical and chemical properties of sludge particles and destroying the colloidal structure of sludge, allowing more bound water and free water to separate from the sludge particles. However, although sludge dewatering agents have a certain dewatering ability, their performance is no longer sufficient as the actual application requirements increase. Therefore, the development of high-efficiency sludge dewatering agents with excellent performance has important practical significance and application value. Summary of the Invention
[0004] To address the aforementioned technical problems, this invention provides a highly efficient sludge dewatering agent and its preparation method.
[0005] The objective of this invention can be achieved through the following technical solutions:
[0006] A high-efficiency sludge dewatering agent and its preparation method, comprising the following raw materials in parts by weight: 10-30 parts modified polyacrylamide, 5-10 parts modifier, 15-25 parts polyaluminum chloride, 40-50 parts deionized water, 1-2 parts diatomaceous earth, 1-2 parts activated carbon, 1-3 parts calcium oxide, and 1-3 parts wood ash.
[0007] The modifier is prepared by the following method:
[0008] Step A1: At 35℃, hexadecyltrimethylammonium bromide was uniformly dispersed in ethanol and concentrated ammonia water, the pH was adjusted to 8-10, sodium dodecyl sulfate was added, tetraethyl orthosilicate was added dropwise while stirring at 1100 rpm, and after reacting for 3 hours, the mixture was centrifuged, washed, dried at 60℃, extracted with a Soxhlet extractor for 6 hours, washed, and dried to obtain mesoporous SiO2;
[0009] Furthermore, the ratio of hexadecyltrimethylammonium bromide, ethanol, concentrated ammonia, sodium dodecyl sulfate, and tetraethyl orthosilicate is 0.64 g: 60 mL: 60 mL: 0.005 g: 1 mL;
[0010] Mesoporous SiO2 was first synthesized by alkaline catalytic hydrolysis and condensation of tetraethyl orthosilicate.
[0011] Step A2: Chitosan and NaOH solution were stirred at room temperature for 3 hours, frozen at -10℃ for 24 hours, thawed, dried, and γ-glycidyl oxypropyltrimethoxysilane and ethanol were added. The mixture was heated to 60℃ and reacted for 6 hours. Then, ethanol-water mixed solution and mesoporous SiO2 were added, mixed at 35℃ for 10 minutes, and reacted at 60℃ for 1 hour to obtain the preproduct.
[0012] Furthermore, the ratio of chitosan, NaOH solution, γ-glycidyl etheroxypropyltrimethoxysilane, ethanol, ethanol-water mixed solution, and mesoporous SiO2 is 0.05-0.08 mol: 15 mL: 0.05-0.08 mol: 20 mL: 50-80 mL: 0.016-0.03 mol, the mass fraction of NaOH solution is 50%, and the volume ratio of ethanol to deionized water in the ethanol-water mixed solution is 4:1.
[0013] Secondly, the hydroxyl groups of chitosan and the epoxy groups of γ-glycidoxypropyltrimethoxysilane are reacted, and then the siloxy groups of γ-glycidoxypropyltrimethoxysilane are hydrolyzed to form silanol groups, which react with the hydroxyl groups on the surface of mesoporous SiO2 to obtain the preproduct.
[0014] Step A3: Mix the preproduct and isopropanol evenly, heat to 50°C with stirring, react for 1 hour, then slowly add 3-chloro-2-hydroxypropylammonium chloride, heat to 70°C and react at a constant temperature for 7 hours, then refrigerate at -15°C for 24 hours, wash, centrifuge, and dry at 50°C for 24 hours to obtain the modifier.
[0015] Furthermore, the ratio of preproduct, isopropanol, and 3-chloro-2-hydroxypropylammonium chloride is 0.01-0.02 mol: 7 mL: 2-4 mL;
[0016] Finally, the modifier was prepared by reacting the amino group of the preproduct with the chlorine atom of 3-chloro-2-hydroxypropylammonium chloride.
[0017] The modified polyacrylamide is prepared by the following method:
[0018] Step B1: Mix acrylamide and deionized water evenly, adjust pH=5 at room temperature, heat to 80℃ and stir in a water bath for 15 minutes, then add graphene oxide powder, mix in an ultrasonic stirrer for 1 hour, centrifuge, wash, and dry at 60℃ to obtain the intermediate.
[0019] Furthermore, the ratio of acrylamide, deionized water, and graphene oxide powder is 0.01-0.02 mol: 50-100 mL: 0.01-0.02 mol;
[0020] An intermediate was prepared by first reacting the amino group of acrylamide with the carboxyl group of graphene oxide to form an amide bond.
[0021] Step B2: Mix the intermediate, acryloyloxyethyltrimethylammonium chloride and deionized water, add ammonium persulfate and sodium bisulfite under nitrogen protection, react at 50°C for 4 hours, and dry under vacuum to obtain modified polyacrylamide.
[0022] Furthermore, the ratio of the intermediate, acryloyloxyethyltrimethylammonium chloride, and deionized water is 0.01-0.02 mol: 0.01-0.02 mol: 5-10 mL, and the mass concentration of ammonium persulfate and sodium bisulfite is 0.04 wt%.
[0023] Finally, modified polyacrylamide was prepared by copolymerizing the intermediate with the carbon-carbon double bond of acryloyloxyethyltrimethylammonium chloride.
[0024] A method for preparing a high-efficiency sludge dewatering agent specifically includes the following steps:
[0025] S1. Mix the modified polyacrylamide, modifier, polyaluminum chloride and deionized water evenly, stir at 50-60℃ for 1-2 hours, then add diatomaceous earth and activated carbon, stir at 400-500 rpm for 2-4 hours to obtain the premixed material.
[0026] S2. Mix the premixed materials, wood ash and calcium oxide evenly, stir at 30-50℃ for 2-4 hours, cool down, and obtain a high-efficiency sludge dewatering agent.
[0027] The beneficial effects of this invention are:
[0028] The high-efficiency sludge dewatering agent of the present invention has a good dewatering effect, as well as an excellent bactericidal effect and extended service life.
[0029] In the modifier prepared in this invention, mesoporous SiO2 possesses a high specific surface area and a regular pore structure, providing a large number of active sites. It can adsorb water in sludge to accelerate dehydration and reduce drying time. Furthermore, it can alter the physical properties of the sludge, making it drier and more stable, reducing its volume and weight for easier transportation and disposal. Simultaneously, it fixes heavy metals in the sludge, reducing secondary pollution to the environment. Under ultraviolet light, mesoporous SiO2 exhibits strong oxidizing properties, generating H2O2 and reactive oxygen species, which destroy bacterial organic matter and inhibit growth and reproduction. Simultaneously, the released silicon ions disrupt the bacterial cell wall, causing the contents to leak out and inducing protein denaturation, thus achieving sterilization. Additionally, 3 -Chloro-2-hydroxypropylammonium chloride neutralizes the charge of negatively charged particles in sludge due to its cationic properties, promoting the aggregation of fine particles into large flocs. It works synergistically with chitosan to enhance flocculation and improve dewatering efficiency. This flocculation not only improves sedimentation and filtration performance, but also breaks down emulsified oil droplets in sludge, releasing water and reducing moisture content. Among these, quaternary ammonium salts can penetrate bacterial cell walls and react with cell membrane proteins, causing membrane rupture and protein leakage, accelerating bacterial death and enhancing antibacterial effects. In addition, it works synergistically with chitosan to firmly adsorb onto negatively charged bacterial cell walls, destroying their structure. It may also penetrate cell walls to cause rupture or form pores, inhibiting bacterial activity.
[0030] The modified polyacrylamide prepared in this invention, by introducing graphene oxide, significantly enhances its flocculation capacity. Through interaction with suspended particles in sludge, it forms larger flocs, accelerating the separation of sludge and water, and improving dewatering efficiency. Simultaneously, it improves the rheological properties of the sludge, enhancing its flowability, which facilitates sludge processing during dewatering, reduces equipment wear and energy consumption, and facilitates sludge transportation and subsequent treatment in pipelines. The modified polyacrylamide also has a thickening effect, increasing sludge viscosity, preventing excessively rapid sedimentation of solids in the sludge, and promoting the separation of water and sludge. Furthermore, it can transform hydrophilic colloids in sludge into hydrophobic colloids, making water removal easier, significantly reducing the water content of sludge, and improving dewatering efficiency. In addition, the charged molecular chains of modified polyacrylamide can combine with suspended particles in sludge through charge neutralization or physical entanglement to form large flocs, which are easy to settle under gravity, further accelerating the removal of suspended solids in sludge, improving the dewatering performance of sludge, and through the bridging and adsorption of polymer chains, causing solid particles in sludge to aggregate into large clumps, reducing sludge volume and water content, and lowering treatment costs. Detailed Implementation
[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0032] Example 1: A method for preparing a high-efficiency sludge dewatering agent, specifically including the following steps:
[0033] S1. Weigh the raw materials according to the following weight parts: 10 parts modified polyacrylamide (prepared in this embodiment), 5 parts modifier (prepared in this embodiment), 15 parts polyaluminum chloride, 40 parts deionized water, 1 part diatomaceous earth, 1 part activated carbon, 1 part calcium oxide, and 1 part wood ash; mix the modified polyacrylamide, modifier, polyaluminum chloride, and deionized water evenly, stir at 50°C for 1 hour, then add diatomaceous earth and activated carbon, stir at 400 rpm for 2 hours to obtain a premixed material;
[0034] S2. Mix the premixed materials, wood ash and calcium oxide evenly, stir at 30℃ for 2 hours, cool down, and obtain a high-efficiency sludge dewatering agent.
[0035] The modifier is prepared by the following method:
[0036] Step A1: At 35℃, 0.64g of cetyltrimethylammonium bromide was uniformly dispersed in 60mL of ethanol and 60mL of concentrated ammonia water. The pH was adjusted to 8, 0.005g of sodium dodecyl sulfate was added, and 1mL of tetraethyl orthosilicate was added dropwise while stirring at 1100rpm. After reacting for 3h, the mixture was centrifuged, washed, and dried at 60℃. The mixture was then extracted using a Soxhlet extractor for 6h, washed, and dried to obtain mesoporous SiO2.
[0037] Step A2: 0.05 mol chitosan and 15 mL NaOH solution were stirred at room temperature for 3 h, frozen at -10℃ for 24 h, thawed, dried, and 0.05 mol γ-glycidyl etheroxypropyltrimethoxysilane and 20 mL ethanol were added. The mixture was heated to 60℃ and reacted for 6 h. Then, 50 mL of ethanol-water mixed solution and 0.016 mol mesoporous SiO2 were added, mixed at 35℃ for 10 min, and reacted at 60℃ for 1 h to obtain the preproduct. The mass fraction of NaOH solution was 50%, and the volume ratio of ethanol to deionized water in the ethanol-water mixed solution was 4:1.
[0038] Step A3: Mix 0.01 mol of preproduct and 7 mL of isopropanol evenly, heat to 50°C with stirring, react for 1 h, then slowly add 2 mL of 3-chloro-2-hydroxypropylammonium chloride, heat to 70°C and react at a constant temperature for 7 h, then refrigerate at -15°C for 24 h, wash, centrifuge, dry at 50°C for 24 h to obtain the modifier.
[0039] The modified polyacrylamide is prepared by the following method:
[0040] Step B1: Mix 0.01 mol acrylamide and 50 mL deionized water evenly, adjust pH to 5 at room temperature, heat to 80℃ and stir in a water bath for 15 min, then add 0.01 mol graphene oxide powder, mix in an ultrasonic stirrer for 1 h, centrifuge, wash, and dry at 60℃ to obtain the intermediate.
[0041] Step B2: Mix 0.01 mol of intermediate, 0.01 mol of acryloyloxyethyltrimethylammonium chloride and 5 mL of deionized water, add ammonium persulfate and sodium bisulfite under nitrogen protection, react at 50 °C for 4 h, and dry under vacuum to obtain modified polyacrylamide. The mass concentration of ammonium persulfate and sodium bisulfite is 0.04 wt%.
[0042] Example 2: A method for preparing a high-efficiency sludge dewatering agent, specifically including the following steps:
[0043] S1. Weigh the raw materials according to the following weight parts: 20 parts modified polyacrylamide (prepared in this example), 7.5 parts modifier (prepared in this example), 20 parts polyaluminum chloride, 45 parts deionized water, 1.5 parts diatomaceous earth, 1.5 parts activated carbon, 2 parts calcium oxide, and 2 parts wood ash; mix the modified polyacrylamide, modifier, polyaluminum chloride, and deionized water evenly, stir at 55°C for 1.5 hours, then add diatomaceous earth and activated carbon, and stir at 450 rpm for 3 hours to obtain a premixed material;
[0044] S2. Mix the premixed materials, wood ash and calcium oxide evenly, stir at 40℃ for 3 hours, cool down, and obtain a high-efficiency sludge dewatering agent.
[0045] The modifier is prepared by the following method:
[0046] Step A1: At 35℃, 0.64g of cetyltrimethylammonium bromide was uniformly dispersed in 60mL of ethanol and 60mL of concentrated ammonia water. The pH was adjusted to 9. 0.005g of sodium dodecyl sulfate was added, and 1mL of tetraethyl orthosilicate was added dropwise while stirring at 1100rpm. After reacting for 3h, the mixture was centrifuged, washed, and dried at 60℃. The mixture was then extracted using a Soxhlet extractor for 6h, washed, and dried to obtain mesoporous SiO2.
[0047] Step A2: 0.065 mol chitosan and 15 mL NaOH solution were stirred at room temperature for 3 h, frozen at -10℃ for 24 h, thawed, dried, and 0.065 mol γ-glycidyl etheroxypropyltrimethoxysilane and 20 mL ethanol were added. The mixture was heated to 60℃ and reacted for 6 h. Then, 65 mL of ethanol-water mixed solution and 0.023 mol mesoporous SiO2 were added, mixed at 35℃ for 10 min, and reacted at 60℃ for 1 h to obtain the preproduct. The mass fraction of NaOH solution was 50%, and the volume ratio of ethanol to deionized water in the ethanol-water mixed solution was 4:1.
[0048] Step A3: Mix 0.015 mol of preproduct and 7 mL of isopropanol evenly, heat to 50 °C with stirring, react for 1 h, then slowly add 2-4 mL of 3-chloro-2-hydroxypropylammonium chloride, heat to 70 °C and react at a constant temperature for 7 h, then refrigerate at -15 °C for 24 h, wash, centrifuge, and dry at 50 °C for 24 h to obtain the modifier;
[0049] The modified polyacrylamide is prepared by the following method:
[0050] Step B1: Mix 0.015 mol acrylamide and 75 mL deionized water evenly, adjust pH to 5 at room temperature, heat to 80℃ and stir in a water bath for 15 min, then add 0.015 mol graphene oxide powder, mix in an ultrasonic stirrer for 1 h, centrifuge, wash, and dry at 60℃ to obtain the intermediate.
[0051] Step B2: Mix 0.015 mol of intermediate, 0.015 mol of acryloyloxyethyltrimethylammonium chloride and 7.5 mL of deionized water, add ammonium persulfate and sodium bisulfite under nitrogen protection, react at 50 °C for 4 h, and dry under vacuum to obtain modified polyacrylamide. The mass concentration of ammonium persulfate and sodium bisulfite is 0.04 wt%.
[0052] Example 3: A method for preparing a high-efficiency sludge dewatering agent, specifically including the following steps:
[0053] S1. Weigh the raw materials according to the following weight parts: 30 parts of modified polyacrylamide (prepared in this embodiment), 10 parts of modifier (prepared in this embodiment), 25 parts of polyaluminum chloride, 50 parts of deionized water, 2 parts of diatomaceous earth, 2 parts of activated carbon, 3 parts of calcium oxide, and 3 parts of wood ash; mix the modified polyacrylamide, modifier, polyaluminum chloride, and deionized water evenly, stir at 60°C for 2 hours, then add diatomaceous earth and activated carbon, stir at 500 rpm for 4 hours to obtain a premixed material;
[0054] S2. Mix the premixed materials, wood ash and calcium oxide evenly, stir at 50℃ for 4 hours, cool down, and obtain a high-efficiency sludge dewatering agent.
[0055] The modifier is prepared by the following method:
[0056] Step A1: At 35℃, 0.64g of cetyltrimethylammonium bromide was uniformly dispersed in 60mL of ethanol and 60mL of concentrated ammonia water. The pH was adjusted to 10, 0.005g of sodium dodecyl sulfate was added, and 1mL of tetraethyl orthosilicate was added dropwise while stirring at 1100rpm. After reacting for 3h, the mixture was centrifuged, washed, and dried at 60℃. The mixture was then extracted using a Soxhlet extractor for 6h, washed, and dried to obtain mesoporous SiO2.
[0057] Step A2: 0.08 mol chitosan and 15 mL NaOH solution were stirred at room temperature for 3 h, frozen at -10℃ for 24 h, thawed, dried, and 0.08 mol γ-glycidyl etheroxypropyltrimethoxysilane and 20 mL ethanol were added. The mixture was heated to 60℃ and reacted for 6 h. Then 80 mL ethanol-water mixed solution and 0.03 mol mesoporous SiO2 were added, mixed at 35℃ for 10 min, and reacted at 60℃ for 1 h to obtain the preproduct. The mass fraction of NaOH solution was 50%, and the volume ratio of ethanol to deionized water in the ethanol-water mixed solution was 4:1.
[0058] Step A3: Mix 0.02 mol of preproduct and 7 mL of isopropanol evenly, heat to 50°C with stirring, react for 1 h, then slowly add 4 mL of 3-chloro-2-hydroxypropylammonium chloride, heat to 70°C and react at a constant temperature for 7 h, then refrigerate at -15°C for 24 h, wash, centrifuge, and dry at 50°C for 24 h to obtain the modifier.
[0059] The modified polyacrylamide is prepared by the following method:
[0060] Step B1: Mix 0.02 mol acrylamide and 100 mL deionized water evenly, adjust pH to 5 at room temperature, heat to 80℃ and stir in a water bath for 15 min, then add 0.02 mol graphene oxide powder, mix in an ultrasonic stirrer for 1 h, centrifuge, wash, and dry at 60℃ to obtain the intermediate.
[0061] Step B2: Mix 0.02 mol of intermediate, 0.02 mol of acryloyloxyethyltrimethylammonium chloride and 10 mL of deionized water, add ammonium persulfate and sodium bisulfite under nitrogen protection, react at 50 °C for 4 h, and dry under vacuum to obtain modified polyacrylamide. The mass concentration of ammonium persulfate and sodium bisulfite is 0.04 wt%.
[0062] Comparative Example 1: This comparative example is a highly efficient sludge dewatering agent. The difference between this example and Example 3 is that an equal amount of aluminum sulfate is used instead of the modifier prepared in Example 3. All other aspects are the same.
[0063] Comparative Example 2: This comparative example is a highly efficient sludge dewatering agent. The difference between this example and Example 3 is that an equal amount of polyacrylamide is used instead of the modified polyacrylamide prepared in Example 3. All other aspects are the same.
[0064] Performance Testing: The high-efficiency sludge dewatering agents prepared in Examples 1-3 and Comparative Examples 1-2 were added to the paper industry sludge to be treated with a moisture content of 95%. The addition amount of the composite sludge dewatering agent in Examples 1-3 was 100 g / kg, and the addition amount of the dewatering agent in Comparative Examples 1-2 was converted to the corresponding solid content. After stirring evenly and conditioning, the mixture was pumped into a diaphragm filter press for dewatering. The pressure was maintained at 2 MPa for 45 min. After depressurization, the sludge cake was discharged, and the moisture content and turbidity were tested. The cake was diluted with sterile physiological saline and incubated in a constant temperature incubator at 37℃ for 12 h. The sterilization rate was measured after incubation. The test results are shown in Table 1 below.
[0065] Table 1
[0066]
[0067] As can be seen from the test data in Table 1, the high-efficiency sludge dewatering agent prepared by the present invention has a good dewatering effect. Table 1 also shows that the high-efficiency sludge dewatering agent prepared by the present invention has a good bactericidal effect and extends its service life.
[0068] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.
Claims
1. A method for preparing a high-efficiency sludge dewatering agent, characterized in that, Specifically, the following steps are included: S1. Weigh the raw materials according to the weight parts, mix 10-30 parts of modified polyacrylamide, 5-10 parts of modifier, 15-25 parts of polyaluminum chloride and 40-50 parts of deionized water evenly, stir at 50-60℃ for 1-2 hours, then add 1-2 parts of diatomaceous earth and 1-2 parts of activated carbon, stir at 400-500 rpm for 2-4 hours to obtain the premixed material; S2. Mix the premixed materials, 1-3 parts of wood ash and 1-3 parts of calcium oxide evenly, stir at 30-50℃ for 2-4 hours, cool down, and obtain a high-efficiency sludge dewatering agent. The modifier is prepared by the following method: Step A1: At 35℃, hexadecyltrimethylammonium bromide was uniformly dispersed in ethanol and concentrated ammonia water, the pH was adjusted to 8-10, sodium dodecyl sulfate was added, tetraethyl orthosilicate was added dropwise and stirred at 1100 rpm, and after reacting for 3 hours, the mixture was centrifuged, washed, dried at 60℃, extracted with a Soxhlet extractor for 6 hours, washed and dried to obtain mesoporous SiO2. Step A2: Mix chitosan and NaOH solution, stir at room temperature for 3 hours, freeze at -10℃ for 24 hours, thaw, dry, add γ-glycidyl oxypropyltrimethoxysilane and ethanol, heat to 60℃, react for 6 hours, then add ethanol-water mixed solution and mesoporous SiO2, mix at 35℃ for 10 minutes, react at 60℃ for 1 hour to obtain the preproduct; Step A3: Mix the preproduct and isopropanol evenly, heat to 50°C with stirring, react for 1 hour, then slowly add 3-chloro-2-hydroxypropylammonium chloride, heat to 70°C and react at a constant temperature for 7 hours, then refrigerate at -15°C for 24 hours, wash, centrifuge, and dry at 50°C for 24 hours to obtain the modifier. The modified polyacrylamide is prepared by the following method: Step B1: Mix acrylamide and deionized water evenly, adjust pH=5 at room temperature, heat to 80℃ and stir in a water bath for 15 minutes, then add graphene oxide powder, mix in an ultrasonic stirrer for 1 hour, centrifuge, wash, and dry at 60℃ to obtain the intermediate. Step B2: Mix the intermediate, acryloyloxyethyltrimethylammonium chloride and deionized water, add ammonium persulfate and sodium bisulfite under nitrogen protection, react at 50°C for 4 hours, and dry under vacuum to obtain modified polyacrylamide.
2. The method for preparing a high-efficiency sludge dewatering agent according to claim 1, characterized in that, In step A1, the ratio of hexadecyltrimethylammonium bromide, ethanol, concentrated ammonia, sodium dodecyl sulfate, and tetraethyl orthosilicate is 0.64 g: 60 mL: 60 mL: 0.005 g: 1 mL.
3. The method for preparing a high-efficiency sludge dewatering agent according to claim 1, characterized in that, In step A2, the ratio of chitosan, NaOH solution, γ-glycidyl etheroxypropyltrimethoxysilane, ethanol, ethanol-water mixed solution, and mesoporous SiO2 is 0.05-0.08 mol: 15 mL: 0.05-0.08 mol: 20 mL: 50-80 mL: 0.016-0.03 mol. The mass fraction of NaOH solution is 50%, and the volume ratio of ethanol to deionized water in the ethanol-water mixed solution is 4:
1.
4. The preparation method of a high-efficiency sludge dewatering agent according to claim 1, characterized in that, In step A3, the ratio of the preproduct, isopropanol, and 3-chloro-2-hydroxypropylammonium chloride is 0.01-0.02 mol: 7 mL: 2-4 mL.
5. The method for preparing a high-efficiency sludge dewatering agent according to claim 1, characterized in that, In step B1, the ratio of acrylamide, deionized water, and graphene oxide powder is 0.01-0.02 mol: 50-100 mL: 0.01-0.02 mol.
6. The method for preparing a high-efficiency sludge dewatering agent according to claim 1, characterized in that, In step B2, the ratio of the intermediate, acryloyloxyethyltrimethylammonium chloride, and deionized water is 0.01-0.02 mol: 0.01-0.02 mol: 5-10 mL, and the mass concentration of ammonium persulfate and sodium bisulfite is 0.04 wt%.
7. A high-efficiency sludge dewatering agent, characterized in that, Prepared by the preparation method according to any one of claims 1-6.