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Sludge dewatering method

A technology for sludge dehydration and sludge, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve problems such as high heavy metal content, secondary pollution, low degree of sludge dehydration, etc. Achieve low operating cost, improve dehydration degree, and avoid heavy metal pollution

Active Publication Date: 2019-02-22
肇庆市珈旺环境技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low degree of sludge dehydration and high content of heavy metals in water after sludge dehydration, the purpose of the present invention is to provide a method for deep dehydration of municipal sludge, which aims to effectively remove water in sludge and fix The heavy metals in it can avoid secondary pollution of heavy metals in recycled effluent and sludge

Method used

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Effect test

Embodiment 1

[0042] A mild hydrothermal modified dehydration method for sludge of the present invention, the raw materials are: municipal sludge, conditioning agent M and modifying agent FeCl 3 . Specific steps are as follows:

[0043] (1) Transport the raw sludge (with a water content of 92wt.%) from Wuhan Sanjintan Sewage Treatment Plant to the conditioning kettle, and add conditioning agent M (wherein the mass ratio of industrial waste residue is 1:12:4 Phosphorus slag, slag and boiling slag, the activator is Na with a mass ratio of 8:1:4:7 2 CO 3 , NaOH, KAl(SO 4 ) 2 12H 2 O and CaSO 4 ; The mass ratio of industrial waste residue and activator is 85:10), the addition of conditioner M is 8wt.% of the amount of sludge, and reacted for 1h under stirring conditions;

[0044](2) The sludge treated by the conditioning tank is pumped to the hydrothermal modification conditioning tank, and the modified conditioning agent FeCl is added 3 , the addition amount is 4wt.% of the sludge amou...

Embodiment 2

[0049] A mild hydrothermal modified dehydration method for sludge of the present invention, the raw materials are: municipal sludge, conditioning agent M and modifying agent FeCl 3 . Specific steps are as follows:

[0050] (1) Transport the raw sludge (with a water content of 92wt.%) from Wuhan Sanjintan Sewage Treatment Plant to the conditioning kettle, and add conditioning agent M (wherein the mass ratio of industrial waste residue is 1:12:4 Phosphorus slag, slag and boiling slag; the activator is Na with a mass ratio of 8:1:4:7 2 CO 3 , NaOH, KAl(SO 4 ) 2 12H 2 O and CaSO 4 ; The mass ratio of industrial waste slag and activator is 85:10), the addition of conditioner M is 15wt.% of the amount of sludge, and reacted for 1.5h under stirring conditions;

[0051] (2) The sludge treated by the conditioning tank is pumped to the hydrothermal modification conditioning tank, and the modified conditioning agent FeCl is added 3 , the amount added is 4wt.% of the amount of slu...

Embodiment 3

[0056] A mild hydrothermal modified dehydration method for sludge of the present invention, the raw materials are: municipal sludge, conditioning agent M and modifying agent FeCl 3 . Specific steps are as follows:

[0057] (1) Transport the raw sludge (with a water content of 92wt.%) from Wuhan Sanjintan Sewage Treatment Plant to the conditioning kettle, and add conditioning agent M (wherein the mass ratio of industrial waste residue is 1:12:4 Phosphorus slag, slag and boiling slag; the activator is Na with a mass ratio of 8:1:4:7 2 CO 3 , NaOH, KAl(SO 4 ) 2 12H 2 O and CaSO 4 ; The mass ratio of industrial waste slag and activator is 85:10), the addition of conditioner M is 2wt.% of the amount of sludge, and reacted for 1h under stirring conditions;

[0058] (2) The sludge treated by the conditioning tank is pumped to the hydrothermal modification conditioning tank, and the modified conditioning agent FeCl is added 3 , the addition amount is 2wt.% of the sludge amount...

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Abstract

The invention belongs to the technical field of sludge treatment, and particularly discloses a sludge dewatering method. The method comprises the following steps: performing pre-reaction on sludge anda conditioner M; adding a flocculating agent to the pre-reaction system, and performing hydrothermal reaction under the sealed condition; finally, performing solid-liquid separation to recover waterin the pre-reaction system to obtain dry sludge. The conditioner M comprises industrial waste residues and an activator. According to the method, the content of heavy metals in water removed from thesludge is lower, and harmless treatment and reduction of the sludge are achieved.

Description

technical field [0001] The invention relates to a sludge dehydration method, which belongs to the field of sludge reduction treatment. Background technique [0002] In the past ten years, China has become a major producer of municipal sludge, and the annual output of sludge has grown rapidly. In addition, with the implementation of the "13th Five-Year Plan", more sewage treatment plants will be built across the country, and the annual surplus sludge production is expected to reach 60 million tons. Because the sludge is unstable, perishable, has a foul smell, and in addition to containing refractory organic matter and nutrients such as nitrogen and phosphorus, there are also biological pollution sources such as heavy metals, pathogenic bacteria and parasites, so it is a difficult to deal with. semi-solid pollutants. Therefore, sludge must be properly treated and disposed of, otherwise it will damage the public environment, endanger human health, affect social development, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/122
CPCC02F11/122C02F11/14
Inventor 侯浩波李政家刘石香雷杰妮张凯何雯婧
Owner 肇庆市珈旺环境技术研究院
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