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Deep city sludge dehydration curing method

A solidification method and deep dehydration technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of affecting system processing efficiency, large wear of pumps and pipelines, increased cost and land occupation, etc. problems, to achieve the effect of reducing environmental pollution, strong reliability, and good dehydration effect

Inactive Publication Date: 2019-11-01
ROAD ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is aimed at the sludge in the secondary sedimentation tank of the sewage treatment plant, but since most of the existing sewage treatment plants have built sludge concentration facilities and dehydration equipment and facilities, the equipment will be left idle, increasing the cost and occupying an area
At the same time, due to the investment of zeolite, the wear and tear on the pump and pipeline is increased, which reduces its service life and affects the processing efficiency of the system.

Method used

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  • Deep city sludge dehydration curing method
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Examples

Experimental program
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Effect test

Embodiment 1

[0050] The municipal sludge deep dehydration solidifying agent and its dehydration solidification method of the present embodiment are carried out according to the following steps:

[0051] 1) Sludge from a sewage plant (dewatered sludge from preliminary dehydration treatment) is pumped into a sludge mixing agitator through a delivery pump, water is added to adjust the moisture content of the sludge to 95%, and the sludge is mixed evenly;

[0052] 2) Mix quicklime with 15% dry sludge content and fly ash with 15% dry sludge content, add water to make a slurry, put the above slurry into a sludge mixing mixer, and stir evenly; then put Add water to iron salt in a ratio of 1:1 to 2 to make a solution, put the iron salt solution into a mixing agitator, and stir evenly. The iron salt is ferric chloride, and the dosage accounts for 5% of the absolute dry sludge. %;

[0053] 3) Put the conditioned sludge into the plate and frame filter press through the feed pump (piston pump) for de...

Embodiment 2

[0055] The municipal sludge deep dehydration solidifying agent and its dehydration solidification method of the present embodiment are carried out according to the following steps:

[0056] 1) Sludge from a sewage plant (dewatered sludge from preliminary dehydration treatment) is pumped into a sludge mixing agitator through a delivery pump, water is added to adjust the moisture content of the sludge to 94%, and the sludge is stirred evenly;

[0057] 2) Mix quicklime with 25% dry sludge content and fly ash with 12.5% ​​dry sludge content, add water to make a slurry, put the above slurry into a sludge mixing mixer, and stir evenly; then put Add water to iron salt in a ratio of 1:1 to 2 to make a solution, put the iron salt solution into a mixing agitator, and stir evenly. The iron salt is ferric sulfate, and the dosage accounts for 3% of the absolute dry sludge amount;

[0058] 3) Put the conditioned sludge into the plate and frame filter press through the feed pump (piston pump...

Embodiment 3

[0060] The municipal sludge deep dehydration solidifying agent and its dehydration solidification method of the present embodiment are carried out according to the following steps:

[0061] 1) Sludge from a sewage plant (dewatered sludge from preliminary dehydration treatment) is pumped into a sludge mixing agitator through a delivery pump, water is added to adjust the moisture content of the sludge to 92%, and the mixture is stirred;

[0062] 2) Mix quicklime with 30% dry sludge content and fly ash with 10% dry sludge content, add water to make a slurry, put the above slurry into a sludge mixing mixer, and stir evenly; then put Iron salt is prepared by adding water in a ratio of 1:1 to 2 to make a solution, put the iron salt solution into a mixing agitator, and stir evenly. The iron salt is a mixed iron salt of ferric sulfate and polyferric sulfate, and the dosage is absolutely 1% of the dry sludge volume;

[0063] 3) Put the conditioned sludge into the plate and frame filte...

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Abstract

The invention relates to a deep city sludge dehydration curing method which needs a curing conditioning agent and comprises the following steps: 1) adding water into municipal sludge, and performing uniform stirring and mixing so as to obtain sludge slurry; wherein the mass percentage of the water is 8-10% of the dry weight of the sludge; 2) adding quick lime and coal ash into the sludge slurry prepared in the step 1), performing stirring, adding an iron salt, and performing stirring so as to obtain paste slurry; and 3) performing press filtering on the paste slurry prepared in the step 2) byusing a plate frame filter press till the water content is 50% or less, so as to obtain mud cakes of which the water content is 50% or less. The method not only is low in cost, good in sludge dehydration effect, capable of forming hard plastic mud cakes after dehydration and good in curing effect, but also takes effects of sterilization and deodorization on sludge.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for deep dehydration and solidification of municipal sludge. Background technique [0002] Municipal sludge is a kind of high-water solid waste produced in the process of sewage treatment in sewage treatment plants. With the rapid development of urbanization, the amount of sewage treatment continues to increase, and the output of sludge is increasing day by day. Sludge treatment has become an urgent Environmental problems to be solved, among which reducing the moisture content of sludge is the primary issue of sludge treatment and disposal. Most of the sludge from conventional sewage treatment plants is simply dehydrated to landfill with a moisture content of about 80%. The goal of dewatering the sludge to less than 50% water content", simply relying on the mechanical dehydration process of the sewage treatment plant obviously cannot meet the water content...

Claims

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Application Information

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IPC IPC(8): C02F11/143C02F11/145C02F11/122C02F11/00
CPCC02F11/008C02F11/122C02F2303/02C02F2303/04C02F11/143C02F11/145
Inventor 胡芳季光明程润喜周欢邹迪
Owner ROAD ENVIRONMENT TECH
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