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Method for intensifying sludge voltage filtration dehydration by using composite additive

A composite additive and sludge technology, applied in chemical instruments and methods, electrochemical sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as moisture content reduction, secondary pollution, and bulky sludge. Achieve the effect of improving dehydration performance, ensuring continuity and enhancing free water content

Active Publication Date: 2021-08-27
ZHEJIANG GONGSHANG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The high water content of sludge is the bottleneck that restricts the treatment and disposal of sludge. The sludge with high water content is not only bulky, but also contains a large amount of organic matter, heavy metals and harmful microorganisms that are easily corrupted or released into the environment, causing secondary pollution. It will have adverse effects on the subsequent landfill, incineration and resource utilization of sludge.
Due to the combination of moisture and sludge particles, traditional mechanical sludge dewatering devices such as pressurized dehydrators such as belt presses or filter presses or centrifugal dehydrators cannot reduce the moisture content to a low enough level, resulting in The minimum water content of dewatered sludge is about 80%

Method used

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  • Method for intensifying sludge voltage filtration dehydration by using composite additive
  • Method for intensifying sludge voltage filtration dehydration by using composite additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take the sludge with a moisture content of 79.2% after dehydration by a plate and frame filter press with a working pressure of 2MPa in the sludge treatment plant, first add PAC with a sludge quality of 1.6‰, stir evenly, and then add PAM with a sludge quality of 0.2‰ , sent to the voltage filter for drying and dehydration, the operating voltage is 16V, the operating current is 3.2A, the mechanical pressure is 0Mpa for 0-4min, 1Mpa for 4-6min, and 2Mpa for 6-20min. After dehydration, the moisture content of the sludge was reduced to 39.8%.

Embodiment 2

[0042]Take the sludge with a water content of 83% after dehydration by a plate and frame filter press with a working pressure of 2.5MPa in the sludge treatment plant, first add aluminum sulfate with a sludge mass of 1‰, stir evenly, and then add a sludge mass of 0.6‰ The sodium polyacrylate is sent to the voltage filter for drying and dehydration, the operating voltage is 16V, the operating current is 3.2A, the mechanical pressure is 0Mpa for 0-4min, 1Mpa for 4-6min, and 2Mpa for 6-20min. After dehydration, the moisture content of the sludge reaches 43.7%.

Embodiment 3

[0044] Take the sludge with a moisture content of 85% after dehydration by a plate and frame filter press with a working pressure of 1MPa in the sludge treatment plant, first add iron sulfate with a sludge mass of 2‰, stir evenly, and then add 0.12‰ of the sludge mass PAM is sent to the voltage filter for drying and dehydration, the operating voltage is 10V, the operating current is 2A, the mechanical pressure is 0Mpa for 0-4min, 1Mpa for 4-6min, and 2Mpa for 6-20min. After dehydration, the moisture content of the sludge reaches 42.6%.

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Abstract

The invention discloses a method for intensifying sludge voltage filtration dehydration by using a composite additive, and belongs to the technical field of sludge dehydration treatment. The method comprises: adding a coagulant into the pretreated sludge, stirring, then adding a flocculating agent, continuously stirring to obtain a mixture, and dehydrating through a voltage filter. The sludge dehydrated by the method does not generate secondary pollution, is low in water content, can be used as a fertilizer raw material, a fuel raw material or a raw material of a building material, and is energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of sludge dewatering treatment, and in particular relates to a method for strengthening voltage filter dehydration of sludge with compound additives. Background technique [0002] The high water content of sludge is the bottleneck restricting the treatment and disposal of sludge. The sludge with high water content is not only bulky, but also contains a large amount of organic matter, heavy metals and harmful microorganisms, which are easily corrupted or released into the environment, causing secondary pollution. It will have adverse effects on the subsequent landfill, incineration and resource utilization of sludge. Due to the combination of moisture and sludge particles, traditional mechanical sludge dewatering devices such as pressurized dehydrators such as belt presses or filter presses or centrifugal dehydrators cannot reduce the moisture content to a low enough level, resulting in The minimum water con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/122C02F11/148
CPCC02F11/148C02F11/122C02F11/006Y02W10/37
Inventor 蔡美强金米聪韦珊珊陆萍燕李政董春颖吴琼庞宇昂宋志军施跃锦
Owner ZHEJIANG GONGSHANG UNIVERSITY
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