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Composite sludge dewatering curing agent and preparation method and application thereof

A sludge dehydration and curing agent technology, applied in the field of water treatment, can solve the problems of hindering cement hydration reaction, high organic matter content in sludge, slow coagulation and hardening, etc., and achieve good curing effect, large specific surface area and strong permeability Effect

Inactive Publication Date: 2021-03-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of cement and lime used as curing agents is high, and the setting and hardening are slow. Under the condition of high water-solid ratio, they will partially settle before setting, and the content of sludge organic matter is high, which will hinder the hydration reaction of cement and the curing effect is poor. can't even do

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of composite sludge dehydration curing agent: at room temperature, mix composite Portland cement, cationic polyacrylamide, and nano-calcium materials with a particle size of less than 200 mesh, then grind the mixture until the particle size is smaller than 200 mesh, and then add Polyaluminum silicon sulfate, polyamine, and polyaspartic acid are obtained by stirring evenly, wherein the mass ratio of composite cement, polyaluminum silicon sulfate, polyamine, cationic polyacrylamide, nano-calcium material, and polyaspartic acid is 10:8:1.2:0.4:0.12:0.06.

[0024] Dig the silt out of the lake to remove large lumps. The moisture content of the sludge was determined to be 54.6%. Put 500g of sludge into the mixer, add 10g of curing agent, and stir mechanically to make it evenly mixed. After stirring for about 2 minutes, the sludge gradually hardens. Stop stirring and filter with suction. The water content of the solidified sludge was 21.2%. Its strength is 650KN...

Embodiment 2

[0026] Preparation of composite sludge dehydration curing agent: at room temperature, mix composite Portland cement, cationic polyacrylamide, and nano-calcium materials with a particle size of less than 200 mesh, then grind the mixture until the particle size is smaller than 200 mesh, and then add Polyaluminum silicon sulfate, polyamine, and polyaspartic acid are obtained by stirring evenly, wherein the mass ratio of composite cement, polyaluminum silicon sulfate, polyamine, cationic polyacrylamide, nano-calcium material, and polyaspartic acid is 10:10:0.6:1:0.12:0.06.

[0027] The silt is dredged from the lake to remove lumps and sticks. The moisture content of the sludge was determined to be 53.8%. Put 500g of sludge into the mixer, add 10g of curing agent, and stir mechanically to make it evenly mixed. After stirring for about 2 minutes, the sludge gradually hardens. Stop stirring and filter with suction. The water content of the solidified silt is 20.4%, and its strength...

Embodiment 3

[0029] Preparation of composite sludge dehydration curing agent: at room temperature, mix composite Portland cement, cationic polyacrylamide, and nano-calcium materials with a particle size of less than 200 mesh, then grind the mixture until the particle size is smaller than 200 mesh, and then add Polyaluminum silicon sulfate, polyamine, and polyaspartic acid are obtained by stirring evenly, wherein the mass ratio of composite cement, polyaluminum silicon sulfate, polyamine, cationic polyacrylamide, nano-calcium material, and polyaspartic acid is 10:6:0.8:0.8:0.1:0.05.

[0030] The moisture content of dewatered sludge in a city sewage treatment plant is 84.1%. Put 500g of sludge into the mixer, add 20g of curing agent, and stir mechanically to make it evenly mixed. After stirring for about 2 minutes, the sludge gradually hardens. Stop stirring and filter with suction. The water content of the solidified silt is 24.8%, and its strength is 395KN / m when tested by a one-axis comp...

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Abstract

The invention discloses a composite sludge dewatering curing agent and a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method comprises the following steps: mixing the composite cement, the cationic polyacrylamide and the nano-calcium material at room temperature, grinding the mixture until the particle size is less than 200 meshes, adding the polysilicate aluminum sulfate, the polyamine and the polyaspartic acid, and uniformly stirring to obtain the composite sludge dewatering curing agent. The composite sludge dewatering curing agent is high in permeability and high in curing speed, a good curing effect can be achieved by using a small amount of the composite sludge dewatering curing agent, a formed cured product is high in strength, the water content of sludge treated by the composite sludge dewatering curing agent is reduced to 25-40%, the sludge can be directly used for incineration, and therefore resourceful treatment of the sludge is achieved.

Description

technical field [0001] The invention relates to a composite sludge dehydration solidifying agent and its preparation method and application, belonging to the technical field of water treatment. Background technique [0002] The composition of municipal sludge is complex, containing a large number of microorganisms, pathogens, heavy metals and organic pollutants. The sludge quality usually accounts for 0.3% to 0.5% of the sewage volume, and the advanced treatment will increase the sludge volume by 0.5 to 1 times. At present, my country's urban sewage treatment plants discharge 30×10 dry mud every year. 4 tons, and is growing at a rate of about 10% per year. In addition, with the development of the global economy and the increase in activities to modify the earth's geographical environment, there are more and more dredging operations in coastal and inland rivers and lakes, as well as in urban waterways. [0003] Because these sludge or silt particles are small, not easy to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/148
CPCC02F11/008C02F11/148
Inventor 李风亭王颖王洪涛吴一楠
Owner TONGJI UNIV
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