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CN107459249B - Method for solidifying river sludge - Google Patents

Method for solidifying river sludge Download PDF

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Publication number
CN107459249B
CN107459249B CN201710747968.4A CN201710747968A CN107459249B CN 107459249 B CN107459249 B CN 107459249B CN 201710747968 A CN201710747968 A CN 201710747968A CN 107459249 B CN107459249 B CN 107459249B
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sludge
monomer
stirring
acrylate
river
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CN107459249A (en
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苏洁
程文
吕甜
李沛芝
岳子林
贾齐星
王敏
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Xian University of Technology
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Xian University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/008—Sludge treatment by fixation or solidification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

本发明公开的一种河流淤泥的固化方法，步骤1，按照质量比分别称取如下原料：水泥20％～45％，粉煤灰20％～50％，生石灰10％～40％，快速固化树脂0.01％～1％，淤泥强化树脂0.1％～8％；步骤2，对河流淤泥进行预处理；步骤3，向河流淤泥中分步加入上述称取的河流淤泥固化剂的各个原料，使其混合均匀得到块状固化淤泥；步骤4，将块状固化淤泥进行模具压制，最终得到固化淤泥模块；本发明的河流淤泥的固化方法大大缩短淤泥固化时间，提高固化后淤泥材料抗压强度，抗拉强度以及抗开裂性，封闭淤泥中重金属离子使其不游离出来，彻底解决淤泥污染环境的问题。In a method for solidifying river silt disclosed by the invention, in step 1, the following raw materials are respectively weighed according to the mass ratio: cement 20%-45%, fly ash 20%-50%, quicklime 10%-40%, fast-curing resin 0.01% to 1%, and 0.1% to 8% of the silt-reinforced resin; step 2, pretreating the river silt; step 3, adding each raw material of the above-weighed river silt curing agent to the river silt step by step, and mixing them Evenly obtain block solidified sludge; step 4, the block solidified sludge is pressed by a mold, and finally a solidified sludge module is obtained; the solidification method of the river sludge of the present invention greatly shortens the solidification time of the sludge, and improves the compressive strength and tensile strength of the solidified sludge material. Strength and resistance to cracking, seal heavy metal ions in the sludge so that they do not dissociate, and completely solve the problem of sludge pollution.

Description

Method for solidifying river sludge
Technical Field
The invention belongs to the technical field of sludge solidification methods, and particularly relates to a river sludge solidification method.
Background
A large amount of dredged sludge is generated in the construction and maintenance of ports and channels and the water environment treatment process of rivers, lakes and the like every year in China. According to statistics, the annual sludge dredging amount of the bead triangular zone reaches 8 multiplied by 107m3The water environment comprehensive treatment and dredging engineering quantity of the Taihu lake basin is about 3500 ten thousand meters3The maintenance of the deepwater channel at the Yangtze river mouth generates 2000 km of dredged mud every year3. Due to the force of the sludgeThe chemical property is poor, and the engineering can not be directly utilized, so that the land can be only filled nearby, and a large amount of land resources are occupied; at present, river pollution is serious, sludge contains a large amount of water and also contains various heavy metals, organic pollutants, pathogenic microorganisms, parasitic ova and other harmful substances, and secondary pollution is easily caused to the environment by landfill. Therefore, the efficient, economic and green resource treatment of the sludge is vital to energy conservation, emission reduction and ecological environment improvement.
Chemical curing treatment is carried out on the sludge to convert the sludge into engineering materials, so that resource development and utilization of the sludge are achieved; the chemical curing materials that have been studied are mainly: (1) inorganic curing agent: the curing agent mainly comprises cement, quicklime, fly ash, gypsum and the like, and can react with water in the sludge in a series of physical and chemical reactions to generate Ca (OH)2，CaCO3Calcium silicate hydrate and other mixtures are added, so that soil body coupling is increased, and the sludge strength is improved, but the doping amount is large, the treatment efficiency is low, the initial strength time of a curing material is long, and the curing cost is high; (2) organic curing agent: the curing agent is divided into a liquid state and a solid state, and mainly comprises asphalt, a cementing agent, fiber, epoxy resin and the like, the water absorption effect caused by the pores and surface tension of soil is reduced through the effects of ion exchange, chemical polymerization reaction and the like, then the vibration tamping is carried out, the compactness of silt soil is improved, a new silt soil texture structure is formed, although the using amount of the organic curing agent is less, the construction is convenient, the strength of the cured material is relatively lower, the curing time is longer, and the curing agent has certain dependence on the environment.
Disclosure of Invention
The invention aims to provide a method for curing river sludge, which can effectively shorten the curing time and improve the curing strength of the sludge.
The invention adopts the technical scheme that a method for solidifying river sludge comprises the following specific steps:
step 1, weighing the following raw materials in percentage by mass:
20-45% of cement, 20-45% of fly ash, 20-45% of quicklime, 0.1-8% of fast curing resin and 0.01-1% of sludge strengthening resin, wherein the sum of the mass percentages of the raw materials is 100%;
step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities to obtain pretreated sludge;
step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the raw materials to obtain blocky solidified sludge, and specifically performing the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding the cement, the fly ash, the quicklime and the sludge strengthening resin weighed in the step 1 into the pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
and 4, pressing the massive solidified sludge obtained in the step 3.3 into a mould, demoulding, standing and solidifying after pressing to obtain a solidified sludge module.
In step 1, the fast curing resin is specifically prepared according to the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 6-8: 1;
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
and step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65-70 ℃, reacting for 2-3 h, and finally obtaining the fast curing resin.
In the step 1.2, the crosslinking agent accounts for 0.09-1% of the total mass of the comonomer, the inorganic oxide accounts for 0.2-1% of the total mass of the comonomer, and the coupling agent accounts for 0.15-0.4% of the total mass of the comonomer.
In step 1.2, the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 0.5-10% of the content of the main monomer.
The main monomer is acrylic acid, and the auxiliary monomer is one or more of methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, ethylene glycol diacrylate, pentaerythritol triacrylate, cyanoacrylate, trimethylolpropane triacrylate, isooctyl acrylate, phthalic acid diethylene glycol diacrylate, 2-ethylcyclohexyl acrylate, acrylamide, methacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, methacrylonitrile, maleic anhydride, crotonic acid and styrene sulfonic acid.
The inorganic oxide is one or more of titanium dioxide, manganese dioxide, silicon dioxide, ferric oxide, copper oxide, chromium oxide and nickel oxide.
In the step 1, the sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
10-20% of a first monomer, 0.4-1% of a second monomer, 1-4% of a third monomer, 0.1-0.5% of a surfactant, 0.4-1% of an initiator, 1.5-4% of a buffering agent and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
step 1.2, sequentially adding 30-40% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water, stirring, and pre-emulsifying to obtain a pre-emulsion;
step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 20-30% of the initiator weighed in the step 1 and a buffer into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
and step 1.4, after the primary emulsion obtained in the step 3 turns blue, sequentially adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7-8 to obtain the sludge strengthening resin.
The first monomer in step 1.1 is styrene or methyl styrene;
the second monomer is any one of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, tert-butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic acid, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate and tert-butyl methacrylate;
the third monomer is any one of acrylamide, methacrylamide, N-hydroxymethyl acrylamide, dimethylaminopropyl methacrylamide, dimethylformamide, butoxymethyl acrylamide, epoxy resin, hydroxyethyl acrylamide and other nitrogen-containing monomers.
The water content of the pretreated sludge in the step 2 is 60-70%.
In the step 3, the raw materials weighed in the step 1 account for 50% -67% of the pretreated sludge.
In the step 3.2, the stirring speed is 40-80 r/min, and the stirring time is 30-60 min; in the step 3.3, the stirring speed is 100-150 r/min, and the stirring time is 10-30 min.
The invention has the beneficial effects that:
(1) according to the method for curing the river sludge, the sludge strengthening resin is added into the inorganic curing agent, so that the compressive strength, the tensile strength and the crack resistance of the cured sludge are improved, the rapid curing resin is continuously added, the sludge curing time is greatly shortened, the initial strength of the cured sludge is improved, and the cured sludge module can be used in the fields of brick making, roadbed and the like, so that the problem of soil material shortage in China can be solved, and the waste of land resources can be reduced; the river sludge solidification raw material has the advantages of simple formula, low cost, very simple operation, no need of roasting and special devices, continuous operation and suitability for large-scale treatment of river sludge.
(2) The method for solidifying the river silt can treat the silt on site, saves traffic transportation cost, can effectively seal heavy metal ions in the river silt, is difficult to dissociate even in water, thoroughly solves the problem of environmental pollution caused by the silt, and realizes energy conservation and emission reduction.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a method for solidifying river silt, which comprises the following specific steps:
step 1, weighing the following raw materials in percentage by mass:
20-45% of cement, 20-45% of fly ash, 20-45% of quicklime, 0.1-8% of fast curing resin and 0.01-1% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
the rapid curing resin is prepared by the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 6-8: 1;
wherein the dispersing agent is a mixed solution of Span-80 and hexadecyl trimethyl ammonium bromide, and the mass ratio of Span-80 to hexadecyl trimethyl ammonium bromide is 1: 1.
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
the crosslinking agent accounts for 0.09-1% of the total mass of the comonomer, the inorganic oxide accounts for 0.2-1% of the total mass of the comonomer, and the coupling agent accounts for 0.15-0.4% of the total mass of the comonomer.
Wherein the cross-linking agent is N, N' -methylene bisacrylamide, and the coupling agent is tetra-N-propyl zirconate; the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 0.5-10% of the content of the main monomer.
The main monomer is acrylic acid, and the auxiliary monomer is one or more of methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, ethylene glycol diacrylate, pentaerythritol triacrylate, cyanoacrylate, trimethylolpropane triacrylate, isooctyl acrylate, diethylene glycol diacrylate, 2-ethylcyclohexyl acrylate, acrylamide, methacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, methacrylonitrile, maleic anhydride, crotonic acid, and styrenesulfonic acid.
The inorganic oxide is one or more of titanium dioxide, manganese dioxide, silicon dioxide, ferric oxide, copper oxide, chromium oxide and nickel oxide.
And step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65-70 ℃, reacting for 2-3 h, and finally obtaining the fast curing resin.
Wherein the initiator aqueous solution is ammonium persulfate aqueous solution with the mass ratio of 1.1%.
The rapid curing resin is a modified acrylic resin, so that the salt resistance of the acrylic resin can be improved, the addition amount of the rapid curing resin in a curing agent is reduced, the initial strength time of curing sludge is shortened, cracking of the sludge after curing can be inhibited, and the durability is enhanced.
The sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
10-20% of a first monomer, 0.4-1% of a second monomer, 1-4% of a third monomer, 0.1-0.5% of a surfactant, 0.4-1% of an initiator, 1.5-4% of a buffering agent and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
wherein the first monomer is styrene or methyl styrene;
the second monomer is any one of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, tert-butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic acid, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate and tert-butyl methacrylate;
the third monomer is: acrylamide, methacrylamide, N-methylolacrylamide, dimethylaminopropyl methacrylamide, dimethylformamide, butoxymethylacrylamide, epoxy resins, hydroxyethyl acrylamide and any other nitrogen-containing monomer.
Step 1.2, sequentially adding 30-40% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water, stirring, and pre-emulsifying to obtain a pre-emulsion;
the surfactant is a mixed solution of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the octyl phenol polyoxyethylene ether is 1: 0.5.
Step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 20-30% of the initiator weighed in the step 1 and a buffer into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
wherein the initiator is ammonium persulfate, and the buffering agent is NaHCO3。
And step 1.4, after the primary emulsion obtained in the step 3 turns blue, sequentially adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7-8 to obtain the sludge strengthening resin.
The sludge reinforced resin can increase the solid content, water resistance, alkali resistance, weather resistance and the like of the product, and can also reduce the dosage of an emulsifier during emulsion polymerization and reduce the product cost.
Step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities to obtain pretreated sludge, wherein the water content of the pretreated sludge is 60% -70%;
removing excessive water from the river sludge through a filter screen to enable the river sludge to be almost solid but soft and without strength, and measuring the water content of the river sludge by using a river sludge water measuring instrument;
the water content of the river sludge is closely related to the river sludge drying, treatment process, river sludge state and flowing performance.
Step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials weighed in the step 1 into the pretreated sludge, and stirring to uniformly mix the raw materials to obtain blocky solidified sludge, wherein the raw materials weighed in the step 1 are 50% -67% of the pretreated sludge;
the method is implemented according to the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding the cement, the fly ash, the quicklime and the sludge strengthening resin weighed in the step 1 into the pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
wherein the stirring speed is 40 r/min-80 r/min, and the stirring time is 30 min-60 min;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
wherein the stirring speed is 100 r/min-150 r/min, and the stirring time is 10 min-30 min.
Step 4, pressing the massive solidified sludge obtained in the step 3 into a die of the multifunctional material testing machine, demolding after pressing, standing and solidifying to obtain a solidified sludge module; and (3) pressing the massive solidified sludge obtained in the step (3) into a die for standing solidification, so that the river sludge can achieve the effect of long-term solidification, and the phenomenon that the river sludge is loosened in a short period and influences the solidification effect and the later-stage reuse of the solidified sludge is avoided.
Example 1
Step 1, weighing the following raw materials in percentage by mass:
20% of cement, 35.09% of fly ash, 44.80% of quicklime, 0.01% of fast curing resin and 0.1% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
the rapid curing resin is prepared by the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 6: 1;
wherein the dispersing agent is a mixed solution of Span-80 and hexadecyl trimethyl ammonium bromide, and the mass ratio of Span-80 to hexadecyl trimethyl ammonium bromide is 1: 1.
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
the cross-linking agent accounts for 0.09% of the total mass of the comonomer, the inorganic oxide accounts for 0.2% of the total mass of the comonomer, and the coupling agent accounts for 0.15% of the total mass of the comonomer.
Wherein the cross-linking agent is N, N' -methylene bisacrylamide, and the coupling agent is tetra-N-propyl zirconate; the comonomer is copolymerized by a main monomer and an auxiliary monomer, and the auxiliary monomer accounts for 0.5 percent of the content of the main monomer.
Wherein, the main monomer is acrylic acid, and the auxiliary monomer is methacrylic acid; the inorganic oxide is titanium dioxide.
And step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65 ℃, reacting for 2 hours, and finally obtaining the fast curing resin.
Wherein the initiator aqueous solution is ammonium persulfate aqueous solution with the mass ratio of 1.1%.
The sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
10% of a first monomer, 0.4% of a second monomer, 1% of a third monomer, 0.1% of a surfactant, 0.4% of an initiator, 1.5% of a buffering agent and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
wherein the first monomer is styrene; the second monomer is methyl acrylate; the third monomer is acrylamide.
Step 1.2, sequentially adding 30% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water, stirring, and pre-emulsifying to obtain a pre-emulsion;
the surfactant is a mixed solution of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the octyl phenol polyoxyethylene ether is 1: 0.5.
Step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 20% of the initiator and a buffer agent weighed in the step 1 into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
wherein the initiator is ammonium persulfate, and the buffering agent is NaHCO3。
And step 1.4, after the primary emulsion obtained in the step 3 turns blue, continuously adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion in sequence, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7 to obtain the sludge strengthening resin.
Step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities so as to obtain pretreated sludge with the water content of 65%;
step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials of the river sludge curing agent weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the components to obtain blocky cured sludge, and specifically performing the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding cement, fly ash, quicklime and sludge strengthening resin into the added pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
wherein the stirring speed is 60r/min, and the stirring time is 30 min;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
stirring at 120r/min for 10 min;
wherein the mass ratio of each raw material of the river sludge curing agent to the pretreated sludge is 1: 1.5;
and 4, pressing the massive solidified sludge obtained in the step 3.3 into a mould, demoulding, standing and solidifying after pressing to obtain a solidified sludge module a.
The strength test of the solidified sludge module a is shown in table 1.
Table 1 compressive and tensile strength data table of solidified sludge module a
Figure BDA0001390453510000111
Example 2
Step 1, weighing the following raw materials in percentage by mass:
20% of cement, 30% of fly ash, 41% of quicklime, 1% of fast curing resin and 8% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
the rapid curing resin is prepared by the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 8: 1;
wherein the dispersing agent is a mixed solution of Span-80 and hexadecyl trimethyl ammonium bromide, and the mass ratio of Span-80 to hexadecyl trimethyl ammonium bromide is 1: 1.
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
the cross-linking agent accounts for 1 percent of the total mass of the comonomer, the inorganic oxide accounts for 1 percent of the total mass of the comonomer, and the coupling agent accounts for 0.4 percent of the total mass of the comonomer.
Wherein the cross-linking agent is N, N' -methylene bisacrylamide, and the coupling agent is tetra-N-propyl zirconate; the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 10% of the content of the main monomer.
Wherein the main monomer is acrylic acid, and the auxiliary monomer is methacrylic acid and methyl acrylate
The inorganic oxide is manganese dioxide.
And step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65 ℃, reacting for 2 hours, and finally obtaining the fast curing resin.
Wherein the initiator aqueous solution is ammonium persulfate aqueous solution with the mass ratio of 1.1%.
The sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
the preparation method comprises the following steps of (1) 20% of a first monomer, 1% of a second monomer, 4% of a third monomer, 0.5% of a surfactant, 1% of an initiator, 4% of a buffer and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
wherein the first monomer is styrene; the second monomer is ethyl acrylate; the third monomer is methacrylamide.
Step 1.2, adding 35% of the first monomer, 35% of the second monomer and 35% of the third monomer weighed in the step 1 and a surfactant into water in sequence, stirring, and pre-emulsifying to obtain a pre-emulsion;
the surfactant is a mixed solution of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the octyl phenol polyoxyethylene ether is 1: 2.
Step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 25% of the initiator and a buffer agent weighed in the step 1 into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
wherein the initiator is ammonium persulfate and the bufferThe agent is NaHCO3。
And step 1.4, after the primary emulsion obtained in the step 3 turns blue, continuously adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion in sequence, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7 to obtain the sludge strengthening resin.
Step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities so as to obtain pretreated sludge with the water content of 65%;
step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials of the river sludge curing agent weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the components to obtain blocky cured sludge, and specifically performing the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding cement, fly ash, quicklime and sludge strengthening resin into the added pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
wherein the stirring speed is 80r/min, and the stirring time is 30 min;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
stirring at 100r/min for 10 min;
wherein the mass ratio of each raw material of the river sludge curing agent to the pretreated sludge is 1: 1.5;
and 4, pressing the massive solidified sludge obtained in the step 3.3 into a mould, demoulding, standing and solidifying after pressing to obtain a solidified sludge module b.
The strength test of the solidified sludge module b is shown in table 2.
Table 2 compressive and tensile strength data table for the cured sludge module b.
Figure BDA0001390453510000141
Example 3
Step 1, weighing the following raw materials in percentage by mass:
30% of cement, 40% of fly ash, 26% of quicklime, 0.01% of fast curing resin and 3.99% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
the rapid curing resin is prepared by the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 7: 1;
wherein the dispersing agent is a mixed solution of Span-80 and hexadecyl trimethyl ammonium bromide, and the mass ratio of Span-80 to hexadecyl trimethyl ammonium bromide is 1: 1.
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
the cross-linking agent accounts for 0.2 percent of the total mass of the comonomer, the inorganic oxide accounts for 0.5 percent of the total mass of the comonomer, and the coupling agent accounts for 0.3 percent of the total mass of the comonomer.
Wherein the cross-linking agent is N, N' -methylene bisacrylamide, and the coupling agent is tetra-N-propyl zirconate; the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 4% of the content of the main monomer.
Wherein, the main monomer is acrylic acid, and the auxiliary monomer is ethyl acrylate.
The inorganic oxide is titanium dioxide and manganese dioxide.
And step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65 ℃, reacting for 2 hours, and finally obtaining the fast curing resin.
Wherein the initiator aqueous solution is ammonium persulfate aqueous solution with the mass ratio of 1.1%.
The sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
13% of a first monomer, 0.7% of a second monomer, 3% of a third monomer, 0.3% of a surfactant, 0.5% of an initiator, 2% of a buffer and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
wherein the first monomer is styrene; the second monomer is isopropyl acrylate; the third monomer is N-methylolacrylamide.
Step 1.2, sequentially adding 40% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water, stirring, and pre-emulsifying to obtain a pre-emulsion;
the surfactant is a mixed solution of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the octyl phenol polyoxyethylene ether is 1: 0.5.
Step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 25% of the initiator and the buffer weighed in the step 1 into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
wherein the initiator is ammonium persulfate, and the buffering agent is NaHCO3。
And step 1.4, after the primary emulsion obtained in the step 3 turns blue, continuously adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion in sequence, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7 to obtain the sludge strengthening resin.
Step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities so as to obtain pretreated sludge with the water content of 65%;
step 3, delivering the pretreated sludge into a stirring barrel, gradually adding the river sludge curing agent weighed in the step 1, stirring the mixture to uniformly mix all components to obtain blocky cured sludge, wherein the step of specifically adding the river sludge curing agent comprises the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding cement, fly ash, quicklime and sludge strengthening resin into the added pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
wherein the stirring speed is 70r/min, and the stirring time is 30 min;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
stirring at 150r/min for 10 min;
wherein the mass ratio of each raw material of the river sludge curing agent to the pretreated sludge is 1: 1.5;
and 4, pressing the massive solidified sludge obtained in the step 3.3 into a mould, demoulding, standing and solidifying after pressing to obtain a solidified sludge module c.
The strength tests performed on the solidified sludge module c are shown in table 3.
Table 3 compressive and tensile strength data table for the cured sludge module c.
Figure BDA0001390453510000171
Example 4
Step 1, weighing the following raw materials in percentage by mass:
44.9% of cement, 23% of fly ash, 30% of quicklime, 0.1% of fast curing resin and 2% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
the rapid curing resin is prepared by the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 6: 1;
wherein the dispersing agent is a mixed solution of Span-80 and hexadecyl trimethyl ammonium bromide, and the mass ratio of Span-80 to hexadecyl trimethyl ammonium bromide is 1: 1.
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
the cross-linking agent accounts for 0.6 percent of the total mass of the comonomer, the inorganic oxide accounts for 0.5 percent of the total mass of the comonomer, and the coupling agent accounts for 0.3 percent of the total mass of the comonomer.
Wherein the cross-linking agent is N, N' -methylene bisacrylamide, and the coupling agent is tetra-N-propyl zirconate; the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 0.5-10% of the content of the main monomer.
Wherein, the main monomer is acrylic acid, and the auxiliary monomer is methacrylic acid, methyl acrylate and ethyl acrylate.
The inorganic oxide is titanium dioxide.
And step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 70 ℃, and reacting for 3 hours to finally obtain the fast curing resin.
Wherein the initiator aqueous solution is ammonium persulfate aqueous solution with the mass ratio of 1.1%.
The sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
16% of a first monomer, 0.5% of a second monomer, 2% of a third monomer, 0.3% of a surfactant, 0.7% of an initiator, 3% of a buffer and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
wherein the first monomer is methyl styrene; the second monomer is methyl acrylate; the third monomer is dimethylaminopropyl methacrylamide.
Step 1.2, adding 37% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water in sequence, stirring, and pre-emulsifying to obtain a pre-emulsion;
the surfactant is a mixed solution of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the octyl phenol polyoxyethylene ether is 1: 1.
Step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 25% of the initiator and the buffer weighed in the step 1 into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
wherein the initiator is ammonium persulfate, and the buffering agent is NaHCO3。
And step 1.4, after the primary emulsion obtained in the step 3 turns blue, continuously adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion in sequence, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7 to obtain the sludge strengthening resin.
Step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities so as to obtain pretreated sludge with the water content of 65%;
step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials of the river sludge curing agent weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the components to obtain blocky cured sludge, and specifically performing the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding cement, fly ash, quicklime and sludge strengthening resin into the added pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
wherein the stirring speed is 60r/min, and the stirring time is 30 min;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
stirring at 120r/min for 10 min;
wherein the mass ratio of each raw material of the river sludge curing agent to the pretreated sludge is 1: 1.5;
and 4, pressing the blocky solidified sludge obtained in the step 3.3 into a mould through a pipeline, demolding after pressing, standing and solidifying to obtain a solidified sludge module d.
The cured sludge module d was subjected to strength tests as shown in table 4.
Table 4 compressive and tensile strength data table for cured sludge module d.
Figure BDA0001390453510000191
Figure BDA0001390453510000201
Example 5
Step 1, weighing the following raw materials in percentage by mass:
35% of cement, 20% of fly ash, 41% of quicklime, 0.05% of fast curing resin and 3.95% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
the rapid curing resin is prepared by the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 6: 1;
wherein the dispersing agent is a mixed solution of Span-80 and hexadecyl trimethyl ammonium bromide, and the mass ratio of Span-80 to hexadecyl trimethyl ammonium bromide is 1: 1.
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a;
the cross-linking agent accounts for 0.1 percent of the total mass of the comonomer, the inorganic oxide accounts for 0.3 percent of the total mass of the comonomer, and the coupling agent accounts for 0.2 percent of the total mass of the comonomer.
Wherein the cross-linking agent is N, N' -methylene bisacrylamide, and the coupling agent is tetra-N-propyl zirconate; the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 7 percent of the content of the main monomer.
Wherein, the main monomer is acrylic acid, and the auxiliary monomer is methacrylic acid.
The inorganic oxide is iron oxide.
And step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65 ℃, reacting for 2 hours, and finally obtaining the fast curing resin.
Wherein the initiator aqueous solution is ammonium persulfate aqueous solution with the mass ratio of 1.1%.
The sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
16% of a first monomer, 0.6% of a second monomer, 2% of a third monomer, 0.2% of a surfactant, 0.5% of an initiator, 3% of a buffering agent and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
wherein the first monomer is styrene; the second monomer is methyl acrylate; the third monomer is acrylamide.
Step 1.2, adding 32% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water in sequence, stirring, and pre-emulsifying to obtain a pre-emulsion;
the surfactant is a mixed solution of sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the octyl phenol polyoxyethylene ether is 1: 0.5.
Step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 26% of the initiator and a buffer agent weighed in the step 1 into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
wherein the initiator is ammonium persulfate, and the buffering agent is NaHCO3。
And step 1.4, after the primary emulsion obtained in the step 3 turns blue, continuously adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion in sequence, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7 to obtain the sludge strengthening resin.
Step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities so as to obtain pretreated sludge with the water content of 65%;
step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials of the river sludge curing agent weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the components to obtain blocky cured sludge, and specifically performing the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding cement, fly ash, quicklime and sludge strengthening resin into the added pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
wherein the stirring speed is 80r/min, and the stirring time is 30 min;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
stirring at 100r/min for 30 min;
wherein the mass ratio of each raw material of the river sludge curing agent to the pretreated sludge is 1: 1.5;
and 4, pressing the massive solidified sludge obtained in the step 3.3 into a die, demolding after pressing, standing and solidifying to obtain a solidified sludge module e.
The strength test was performed on the solidified sludge module e as shown in table 5.
Table 5 compressive and tensile strength data table for the cured sludge module e.
Figure BDA0001390453510000221
Figure BDA0001390453510000231
Comparative example 1
Step 1, weighing the following raw materials in percentage by mass:
20.11% of cement, 35.09% of fly ash, 44.80% of quicklime, 0% of quick curing resin and 0% of sludge strengthening resin, wherein the sum of the mass percentages of the components is 100%;
step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities so as to obtain pretreated sludge with the water content of 65%;
step 3, delivering the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials of the river sludge curing agent weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the components to obtain blocky cured sludge,
wherein the stirring speed is 80r/min, and the stirring time is 30 min.
Wherein the mass ratio of each raw material of the river sludge curing agent to the pretreated sludge is 1: 1.5;
and 4, pressing the blocky solidified sludge obtained in the step 3 into a mould through a pipeline, demoulding, standing and solidifying after pressing to obtain a solidified sludge module f.
The strength tests performed on the solidified sludge module f are shown in table 6.
Table 6 compressive and tensile strength data table for the cured sludge module f.
Figure BDA0001390453510000232
Figure BDA0001390453510000241
As can be seen by comparing tables 1-5 with table 6, under the condition that the amount of the inorganic material is basically unchanged, the sludge curing time is greatly shortened by adding the rapid curing resin into the inorganic curing agent, the initial strength of the cured sludge is improved, and the compressive strength, the tensile strength and the crack resistance of the cured sludge are effectively improved by adding the sludge strengthening resin.
In order to study the influence of the curing agent on the heavy metal ions in the river sludge, river sludge is adopted in the river sludge of the experiment to detect the heavy metal content of the uncured river sludge, and after the cured sludge module cured by the river sludge curing agent is soaked in water, the heavy metal condition in the soaking water is detected, and the result is shown in table 7;
TABLE 7 table of the heavy metal ion content of the river sludge in water after solidification
Figure BDA0001390453510000242
As can be seen from Table 7, the sludge contains heavy metals such as Cr, Zn, Pb, Cu, etc.; the solidified river sludge module is soaked in water, the heavy metal content of the soaking water is analyzed after one day, one week and half a month, and no heavy metal component is detected, and the analysis result shows that the river sludge can effectively seal heavy metal ions in the sludge after being solidified by the river sludge solidifying agent disclosed by the invention, the river sludge is difficult to dissociate in water, secondary pollution to the environment is avoided, the problem that the sludge pollutes the environment is thoroughly solved, and energy conservation and emission reduction are realized.

Claims (3)

1. A method for solidifying river sludge is characterized by comprising the following specific steps:
step 1, weighing the following raw materials in percentage by mass:
20-45% of cement, 20-45% of fly ash, 20-45% of quicklime, 0.1-8% of fast curing resin and 0.01-1% of sludge strengthening resin, wherein the sum of the mass percentages of the raw materials is 100%;
step 2, measuring and controlling the water content of the river sludge to enable the river sludge to be in a viscous colloid shape, and carrying out pretreatment through a grating to remove impurities to obtain pretreated sludge;
step 3, conveying the pretreated sludge obtained in the step 2 into a stirring barrel, gradually adding the raw materials weighed in the step 1 into the pretreated sludge, stirring to uniformly mix the raw materials to obtain blocky solidified sludge, and specifically performing the following steps:
step 3.1, sending the pretreated sludge obtained in the step 2 to a stirring barrel;
step 3.2, after the step 3.1, sequentially adding the cement, the fly ash, the quicklime and the sludge strengthening resin weighed in the step 1 into the pretreated sludge, stirring the mixture to fully mix and solidify the mixture to obtain primary solidified sludge;
step 3.3, adding fast curing resin into the primary cured sludge obtained in the step 3.2, and stirring the resin to uniformly mix the fast curing resin and the primary cured sludge to obtain massive cured sludge;
step 4, pressing the massive solidified sludge obtained in the step 3.3 into a mould, demoulding, standing and solidifying after pressing to obtain a solidified sludge module;
in the step 1, the fast curing resin is prepared specifically according to the following steps:
step 1.1, uniformly mixing cyclohexane and a dispersing agent to serve as a solvent, wherein the volume ratio of the cyclohexane to the dispersing agent is 6-8: 1;
step 1.2, mixing and stirring a comonomer, a cross-linking agent, inorganic oxide particles and a coupling agent at the temperature lower than 40 ℃ until the comonomer, the cross-linking agent, the inorganic oxide particles and the coupling agent are dissolved, and then integrally adding the mixture into the solvent prepared in the step 1 to obtain a mixed solution a; the cross-linking agent accounts for 0.09-1% of the total mass of the comonomer, the inorganic oxide accounts for 0.2-1% of the total mass of the comonomer, and the coupling agent accounts for 0.15-0.4% of the total mass of the comonomer; the comonomer is copolymerized by a main monomer and an auxiliary monomer, wherein the auxiliary monomer accounts for 0.5-10% of the content of the main monomer; the main monomer is acrylic acid, and the auxiliary monomer is one or more of methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, ethylene glycol diacrylate, pentaerythritol triacrylate, cyanoacrylate, trimethylolpropane triacrylate, isooctyl acrylate, diethylene glycol diacrylate, 2-ethylcyclohexyl acrylate, acrylamide, methacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, methacrylonitrile, maleic anhydride, crotonic acid and styrene sulfonic acid; the inorganic oxide is one or more of titanium dioxide, manganese dioxide, silicon dioxide, ferric oxide, copper oxide, chromium oxide and nickel oxide;
step 1.3, adding an initiator aqueous solution prepared in advance into the mixed solution a prepared in the step 2, carrying out reversed phase suspension polymerization, heating to 65-70 ℃, reacting for 2-3 h, and finally obtaining the fast curing resin;
in the step 1, the sludge strengthening resin is prepared by the following steps:
step 1.1, weighing the following raw materials in percentage by mass:
10-20% of a first monomer, 0.4-1% of a second monomer, 1-4% of a third monomer, 0.1-0.5% of a surfactant, 0.4-1% of an initiator, 1.5-4% of a buffering agent and the balance of water, wherein the sum of the mass percentages of the raw materials is 100%;
step 1.2, sequentially adding 30-40% of the first monomer, the second monomer and the third monomer weighed in the step 1 and a surfactant into water, stirring, and pre-emulsifying to obtain a pre-emulsion;
step 1.3, heating the pre-emulsion obtained in the step 2 to 80 ℃, and continuously adding 20-30% of the initiator weighed in the step 1 and a buffer into the pre-emulsion in sequence for emulsion polymerization to obtain an initial emulsion;
step 1.4, after the primary emulsion obtained in the step 3 turns blue, sequentially adding the rest of the first monomer, the second monomer, the third monomer and the initiator into the primary emulsion, cooling the temperature to room temperature after complete reaction, and finally adding ammonia water to adjust the pH value to 7-8 to obtain sludge strengthening resin;
the first monomer in the step 1.1 is styrene or methyl styrene;
the second monomer is any one of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, tert-butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic acid, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate and tert-butyl methacrylate;
the third monomer is any one of acrylamide, methacrylamide, N-hydroxymethyl acrylamide, dimethylaminopropyl methacrylamide, dimethylformamide, butoxymethyl acrylamide, epoxy resin, hydroxyethyl acrylamide and other nitrogen-containing monomers;
in the step 3, the raw materials weighed in the step 1 account for 50% -67% of the pretreated sludge.
2. The method for solidifying river sludge according to claim 1, wherein the water content of the pretreated sludge in the step 2 is 60 to 70%.
3. The method for solidifying river sludge according to claim 1, wherein in the step 3.2, the stirring speed is 40-80 r/min, and the stirring time is 30-60 min; in the step 3.3, the stirring speed is 100-150 r/min, and the stirring time is 10-30 min.
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