A sludge drying treatment agent, a sludge drying treatment method and its application

Abstract

The invention discloses a sludge drying treatment agent, a sludge drying treatment method and an application thereof, which belong to the technical field of sludge treatment, and comprises a first component and a second component with a mass ratio of 1:0.1-5, wherein the first component is ordered mesoporous carbon particles, and the second component is at least one of columnar coal-based activated carbon, powdered coal-based activated carbon, columnar wood-based activated carbon, and powdered wood-based activated carbon; the preparation method of the ordered mesoporous carbon particles is as follows: adding a mesoporous molecular sieve to an aqueous dispersion of a propylene monomer, adding an initiator after obtaining a mixed solution, and performing a polymerization reaction at 60-90°C for 3-9 h under an inert gas environment, calcining the obtained solid product under an inert gas environment, and then washing and drying to obtain ordered mesoporous carbon particles. The sludge drying treatment agent can achieve a high dehydration rate of sludge, and can also adsorb and remove COD in the residual sludge, and reduce the agglomeration of the furnace wall of the sludge after drying treatment in the incineration / fuelization process.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and in particular to a sludge drying treatment agent, a sludge drying treatment method and applications thereof. Background Art

[0002] Municipal sludge is a semi-solid or solid substance produced during sewage treatment. It is generally enriched with most of the pollutants in sewage and has extremely complex composition. It contains not only a large amount of organic matter, but also some inorganic matter, microorganisms, pathogens and other harmful substances. As a by-product of sewage treatment, the proper treatment and resource utilization of municipal sludge is an indispensable part of the sustainable development and utilization of resources.

[0003] At present, common sludge disposal methods at home and abroad include landfill, land utilization, incineration, fuel and comprehensive utilization. Compared with other methods, incineration and sludge fuel have outstanding advantages such as small footprint, fast processing speed, high reduction degree and energy recovery. However, since the sludge produced after dehydration in sewage treatment plants has a water content of up to about 80%, directly feeding it into the furnace will cause unstable combustion in the incinerator, and it is generally necessary to dry the dehydrated sludge first.

[0004] The sludge drying treatment method disclosed in the prior art is to add a drying treatment agent to the sludge to increase flocculation, and then dehydrate. Commonly used sludge drying treatment agents include polyacrylamide, polyaluminium chloride, M1 dehydrating agent, diatomaceous earth, kaolin, bentonite, etc. For example, the Chinese patent document with publication number CN117486460A discloses a sludge drying treatment agent, in which the sludge drying treatment agent is a combination of polyacrylamide and an iron-containing polymer coagulant, wherein the iron-containing polymer coagulant is selected from one or more of polyferric sulfate, polyaluminium silicate iron, and a Fenton-like catalyst. The Chinese patent document with publication number CN110372175A discloses a sludge conditioning agent, which includes component A, component B and component C; the mass ratio of component A, component B and component C is 1:0.2~0.5:0.15~0.2; wherein component A is polyferric chloride or polyaluminium chloride, component B is polyacrylamide; component C is cement. The Chinese patent document with publication number CN114230134A discloses an inorganic conditioning agent for municipal sludge drying treatment, which is made of the following raw materials in parts by weight: 40-50 parts of quicklime, 20-30 parts of anhydrous ferric chloride, 10-16 parts of silicon dioxide, 1-3 parts of aluminum oxide, 4-8 parts of potassium chloride, 10-14 parts of activated carbon powder, 15-20 parts of aluminum sulfate, and 18-22 parts of aluminum chloride. However, the iron-containing coagulants and catalysts used in the above inventions have the risk of secondary pollution. In the process of sludge discharge, additional measures are needed to prevent the further spread of pollutants, and some of them also have the problem of poor effluent quality. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a sludge drying treatment agent, which has low cost, can achieve a high sludge dehydration rate, and can also adsorb and remove COD in the remaining sludge, thereby reducing the difficulty of subsequent treatment of the sludge filtrate after drying treatment.

[0006] The specific technical solutions adopted are as follows:

[0007] A sludge drying treatment agent comprises a first component and a second component, wherein the first component is ordered mesoporous carbon particles, and the second component is at least one of columnar coal-based activated carbon, powdered coal-based activated carbon, columnar wood-based activated carbon, and powdered wood-based activated carbon;

[0008] The mass ratio of the first component to the second component is 1:0.1-5, further 1:0.5-1;

[0009] The preparation method of the ordered mesoporous carbon particles is as follows: a mesoporous molecular sieve is added to an aqueous dispersion of a propylene monomer, an initiator is added to the obtained mixed solution, a polymerization reaction is carried out at 60-90°C under an inert gas environment for 3-9 hours, the obtained solid product is calcined under an inert gas environment, and then washed and dried to obtain the ordered mesoporous carbon particles.

[0010] The present invention uses a combination of ordered mesoporous carbon particles prepared by a specific method and at least one of columnar coal-based activated carbon, powdered coal-based activated carbon, columnar wood-based activated carbon, and powdered wood-based activated carbon as a sludge drying treatment agent. The treatment agent has a large specific surface area and an ordered pore structure, so that it has a strong ability to intercept suspended matter. After adsorbing the suspended matter in the remaining sludge, it forms a large floc precipitate, which can achieve a high sludge dehydration rate. In addition, it can complete the initial purification of the effluent water quality during the sludge drying process without the risk of secondary pollution.

[0011] The propenyl monomer includes acrylic acid, the mass ratio of the propenyl monomer to the mesoporous molecular sieve is 1:0.1-0.6, the mass ratio of the initiator to the propenyl monomer is 0.002-0.05:1, and the ordered mesoporous carbon particles with controllable morphology and structure are finally prepared by completely filling the mesoporous molecular sieve template.

[0012] The types of mesoporous molecular sieves include but are not limited to SBA-1, SBA-15, MCM-48 or FDU-5.

[0013] Optionally, the inert gas environment is a nitrogen environment, and the calcination conditions are constant temperature calcination at 600-1000° C. for 5-10 hours.

[0014] Optionally, during washing, 5-45% hydrofluoric acid is used for pickling or 5-25% sodium hydroxide is used for alkaline washing, the pickling or alkaline washing time is 12-20 hours, and then deionized water is used for washing.

[0015] Preferably, during washing, 5-20% hydrofluoric acid is used for pickling or 5-15% sodium hydroxide is used for alkaline washing, and the pickling or alkaline washing time is 15-16 hours.

[0016] The present invention also provides a sludge drying treatment method, comprising the following steps:

[0017] (1) transferring the excess sludge to an excess sludge conditioning tank, adding the sludge drying agent, mixing, and allowing to stand;

[0018] (2) passing the sludge treated in step (1) into a filtration device for preliminary drying and separating the filtrate;

[0019] (3) further drying the sludge after preliminary drying in step (2) to obtain a filter cake;

[0020] The filtrate can enter the water treatment system of the power plant for further treatment or application, and the filter cake can be used as fuel to couple coal-fired power generation.

[0021] Specifically, excess sludge generally refers to the activated sludge discharged from the secondary sedimentation tank (or sedimentation area) in the activated sludge system. Excess sludge includes but is not limited to water supply sludge, domestic sewage sludge, industrial wastewater sludge, etc.

[0022] Based on the absolute dry sludge mass of the residual sludge, the amount of sludge drying agent added is 2.0-15% of the absolute dry sludge mass.

[0023] Preferably, the standing time is 60-120 min.

[0024] The filtering device can be a vacuum filter, a plate and frame filter press, a belt filter or a centrifugal dehydrator, etc. The filtering time of the filtering device is 30-60 minutes.

[0025] Preferably, the chemical oxygen demand (COD) in the filtrate separated after preliminary drying is 200-450 mg / L.

[0026] The drying device used in the drying process is a rotary dryer, a vertical double-axis rotary vane dryer, a horizontal double-axis rotary vane dryer, a horizontal triple-axis rotary vane dryer or a vacuum dryer. The temperature range of the drying process is 200-400°C and the drying time is 60-120 minutes.

[0027] Preferably, the moisture content of the obtained filter cake is 20-50%.

[0028] The present invention also provides the use of the sludge drying treatment agent or the sludge drying treatment method in the treatment of residual sludge fuel.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The sludge drying agent provided by the present invention has an adsorption effect on suspended particles in sludge slurry. The linear polymer in the sludge drying agent forms larger flocs and precipitates after adsorbing the suspended matter, which is beneficial to improving the water removal efficiency of the filtering device. The use of the sludge drying agent can make the COD in the filtrate obtained by filtration separation lower (the initial purification of the effluent water quality can be completed during the sludge drying process), and the cost of the filtrate entering the power plant's greywater treatment system for subsequent treatment is low. A filter cake with a moisture content ranging from 20-50% can also be prepared and used as fuel for power plants. The sludge drying agent is low in cost, green and environmentally friendly, and has no risk of causing secondary pollution.

[0031] (2) The sludge drying treatment agent of the present invention can improve the sludge drying efficiency, further reduce the time cost, and facilitate the rapid sludge drying.

[0032] (3) The filter cake fuel prepared by using the sludge drying treatment agent of the present invention has better stability, longer combustion time and more complete combustion.

[0033] (4) The surface of the sludge drying agent used in the present invention is rich in pores, so that the filter cake fuel crystallizes without melting during the high-temperature combustion process, and the combustion products are not easy to adhere to the furnace wall to form nodules. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is the SEM image of the ordered mesoporous carbon particles prepared in Example 1.

[0035] Figure 2 Flow chart of the sludge drying treatment method. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the examples and accompanying drawings. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The operating methods of the following examples that do not specify specific conditions are usually performed under normal conditions or under conditions recommended by the manufacturer. The content that is not described in detail in this specification sheet belongs to the prior art known to professionals in the field. The experimental materials used in the following examples, if not otherwise specified, can be purchased by conventional biochemical reagent companies.

[0037] The powdered coal-based activated carbon and powdered wood-based activated carbon used in the examples have a mesh size of 300 mesh and an iodine value of 800-1200 mg / g; the columnar coal-based activated carbon and columnar wood-based activated carbon have a particle size of 1.5-3.0 mm and an iodine value of 400-600 mg / h; all of which can be purchased commercially.

[0038] Example 1

[0039] 180 parts by weight of distilled water were added to 90 parts by weight of acrylic acid and stirred for 15 min to obtain an acrylic acid-water mixture. 9 parts by weight of mesoporous molecular sieve SBA-15 was added to the acrylic acid-water mixture and stirred for 30 min. 0.2 parts by weight of azobisisobutyronitrile was added to the obtained mixed solution to construct a reaction system. Under the protection of inert gas nitrogen, the reaction was carried out at a constant temperature of 80°C for 6 h. The obtained solid product was calcined in a constant temperature tube furnace at 900°C for 8 h under a nitrogen environment. Finally, it was soaked in a 5% by weight HF solution for 15 h for acid washing, and then washed with deionized water and dried to obtain ordered mesoporous carbon particles.

[0040] The SEM image of the ordered mesoporous carbon particles prepared in this example is as follows: Figure 1 As shown, its ordered mesoporous structure can be seen, and the performance parameters are as follows: particle size is 1-3 mm; average pore size is 3.5 nm; specific surface area is 500 m 2 / g, and the total pore volume is 0.4-0.55cm 3 / g.

[0041] Example 2

[0042] 270 parts by weight of distilled water were added to 90 parts by weight of acrylic acid and stirred for 25 min to obtain an acrylic acid-water mixture. 12 parts by weight of mesoporous molecular sieve SBA-15 was added to the acrylic acid-water mixture and stirred for 30 min. 0.3 parts by weight of azobisisobutyronitrile was added to the obtained mixed solution to construct a reaction system. Under the protection of inert gas nitrogen, the reaction was carried out at a constant temperature of 90°C for 6 h. The obtained solid product was calcined in a constant temperature tubular furnace at 900°C for 8 h under a nitrogen environment. Finally, it was soaked in a 15% by mass NaOH solution for 15 h for alkaline washing, and then washed with deionized water and dried to obtain ordered mesoporous carbon particles.

[0043] Example 3

[0044] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0045] Take the residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang, and the flow chart of the sludge drying treatment method is as follows: Figure 2As shown, the excess sludge is transferred to the excess sludge conditioning tank, and the amount of sludge drying agent added is 15% of the absolute dry sludge mass of the excess sludge. The sludge is stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process are separated. The filter cake of the filter press process (the sludge after preliminary drying) is further dried at a drying temperature of 200 °C for 90 min to obtain a dried filter cake.

[0046] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0047] Example 4

[0048] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:1 to prepare a sludge drying treatment agent;

[0049] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0050] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0051] Example 5

[0052] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:5 to prepare a sludge drying treatment agent;

[0053] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0054] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0055] Example 6

[0056] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:0.1 to prepare a sludge drying treatment agent;

[0057] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly and allowed to stand for 60 min. The sludge was passed through a filtration device and filtered for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0058] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0059] Example 7

[0060] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0061] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 10% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly and allowed to stand for 60 min. The sludge was passed through a filtration device and filtered for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0062] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0063] Example 8

[0064] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0065] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 5% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly and allowed to stand for 60 min. The sludge was passed through a filtration device and filtered for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0066] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0067] Example 9

[0068] The ordered mesoporous carbon particles prepared in Example 1 and the powdered wood activated carbon were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0069] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 2% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly and allowed to stand for 60 min. The sludge was passed through a filtration device and filtered for 30 min for preliminary drying. The filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0070] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0071] Example 10

[0072] The ordered mesoporous carbon particles and columnar wood activated carbon prepared in Example 1 were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0073] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0074] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0075] Embodiment 11

[0076] The ordered mesoporous carbon particles prepared in Example 1 and the columnar coal-based activated carbon were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0077] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0078] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0079] Example 12

[0080] The ordered mesoporous carbon particles prepared in Example 1 and the powdered coal-based activated carbon were used in a mass ratio of 1:0.5 to prepare a sludge drying treatment agent;

[0081] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0082] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0083] Comparative Example 1

[0084] Using the ordered mesoporous carbon particles prepared in Example 1 as a sludge drying treatment agent;

[0085] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly, allowed to stand for 60 min, and passed through a filtration device for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 200 °C for 90 min to obtain a dried filter cake.

[0086] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0087] Comparative Example 2

[0088] Using powdered wood activated carbon as a sludge drying agent;

[0089] The residual sludge produced in the sedimentation tank of a sewage treatment plant in Hangzhou, Zhejiang was taken and transferred to the residual sludge conditioning tank. The amount of sludge drying agent added was 15% of the absolute dry sludge mass of the residual sludge. The sludge was stirred evenly and allowed to stand for 60 min. The sludge was passed through a filtration device and filtered for 30 min for preliminary drying, and the filter cake and filtrate of the filter press process were separated. The filter cake of the filter press process (the sludge after preliminary drying) was further dried at a temperature of 300 °C for 90 min to obtain a dried filter cake.

[0090] The moisture content of the filter cake in the filter press process and the dried filter cake, as well as the COD value of the filtrate in the filter press process were tested, as shown in Table 1.

[0091] Sample analysis

[0092] The moisture content of the filter cake during the filter press and the dried filter cake as well as the COD value of the filtrate during the filter press detected in the sludge drying process involved in Examples 3-12 of the present invention and Comparative Examples 1-2 are shown in the following table.

[0093] Table 1 Test data of sludge drying process

[0094]

[0095] From the data in the above table, it can be seen that the combination of ordered mesoporous carbon particles and activated carbon (at least one of columnar coal-based activated carbon, powdered coal-based activated carbon, columnar wood-based activated carbon, and powdered wood-based activated carbon) has a significant improvement in the adsorption of COD in the filtrate and the sludge drying effect. Among them, the ordered mesoporous carbon particles and powdered wood-based activated carbon prepared in Example 1 are made into a sludge drying treatment agent in a mass ratio of 1:0.5 and the effect of adding 15% of the absolute dry sludge mass to the treatment is the best.

[0096] The embodiments described above provide a detailed description of the technical solutions of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements or similar substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge drying treatment agent, characterized in that: The method comprises a first component and a second component, wherein the first component is ordered mesoporous carbon particles, and the second component is at least one of columnar coal-based activated carbon, powdered coal-based activated carbon, columnar wood-based activated carbon, and powdered wood-based activated carbon; The mass ratio of the first component to the second component is 1:0.1-5; The method for preparing the ordered mesoporous carbon particles is as follows: adding a mesoporous molecular sieve to an aqueous dispersion of a propylene monomer, adding an initiator to obtain a mixed solution, performing a polymerization reaction at 60-90°C for 3-9 hours under an inert gas environment, calcining the obtained solid product under an inert gas environment, the calcination condition being constant temperature calcination at 600-1000°C for 5-10 hours, and then washing and drying to obtain the ordered mesoporous carbon particles; The propylene monomer is acrylic acid, and the mass ratio of the propylene monomer to the mesoporous molecular sieve is 1:0.1-0.6; When washing, first use 5-45% by mass hydrofluoric acid for pickling or 5-25% by mass sodium hydroxide for alkaline washing for 12-20 hours, and then wash with deionized water.

2. The sludge drying treatment agent according to claim 1, characterized in that: The mass ratio of the initiator to the propylene monomer is 0.002-0.05:

1.

3. The sludge drying treatment agent according to claim 1, characterized in that: The type of the mesoporous molecular sieve is selected from SBA-1, SBA-15, MCM-48 or FDU-5.

4. The sludge drying treatment agent according to claim 1, characterized in that: The inert gas environment is a nitrogen environment.

5. A sludge drying method, characterized in that: The steps include: (1) transferring the excess sludge to an excess sludge conditioning tank, adding the sludge drying treatment agent according to any one of claims 1 to 4, mixing, and allowing to stand; (2) passing the sludge treated in step (1) into a filtration device for preliminary drying and separating the filtrate; (3) Further drying the sludge after preliminary drying in step (2) to obtain a filter cake, and the filter cake is used as a fuel to couple coal-fired power generation.

6. The sludge drying method according to claim 5, characterized in that: Based on the absolute dry sludge mass of the residual sludge, the amount of sludge drying agent added is 2.0-15% of the absolute dry sludge mass.

7. The sludge drying method according to claim 5, characterized in that: The filtration time of the filtration device is 30-60 min; in the filtrate separated after preliminary drying, the chemical oxygen demand COD is 200-450 mg / L.

8. The sludge drying method according to claim 5, characterized in that: The temperature range of the drying process is 200-400°C, and the drying time is 60-120 minutes; the moisture content of the obtained filter cake is 20-50%.

9. Use of the sludge drying agent according to any one of claims 1 to 4 or the sludge drying method according to any one of claims 5 to 8 in the treatment of excess sludge as fuel.

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