Method for concentrating and dehydrating sludge

A technology of sludge concentration and treatment method, applied in dewatering/drying/concentrating sludge treatment, separation methods, chemical instruments and methods, etc., can solve the problems of poor environment, high energy consumption, and high effluent SS

Inactive Publication Date: 2012-08-01
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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Problems solved by technology

Among them, the belt filter press is one of the commonly used sludge dewatering equipment at present, but the water content of the belt filter press can only be controlled at about 75%, which is difficult to meet the current specification requirements, and the flushing water volume is large; The moisture content of the sludge output from the centrifugal dehydrator can only be controlled at a...

Method used

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  • Method for concentrating and dehydrating sludge
  • Method for concentrating and dehydrating sludge
  • Method for concentrating and dehydrating sludge

Examples

Experimental program
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Embodiment Construction

[0024] see figure 1 , figure 2 , the treatment of municipal sludge:

[0025] The first step: sludge conditioning

[0026] Discharge the remaining sludge produced by the domestic sewage after the solid-liquid separation treatment in the biochemical tank and the sedimentation tank into the sludge storage tank, and the sludge in the sludge storage tank (with a moisture content of 99%) is pumped into the sludge conditioning tank, adding polyacrylamide (PAM) to condition the sludge, the addition of polyacrylamide (PAM) is 0.3% of the absolute dry sludge mass;

[0027] Step 2: Sludge Concentration

[0028] The conditioned sludge is pumped into the air-water mixing contact chamber of the flotation sludge thickener, and the sludge passing through the air-water mixing contact chamber rises to the top and is scraped into the sludge tank by the scraper, and clean water Enter the clean water test through the collection system in the clean water collection area. The moisture content ...

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Abstract

The invention discloses a method for concentrating and dehydrating sludge. The method is characterized by comprising the following steps of: adding polyacrylamide into residual sludge of which the moisture content is 99 percent in an amount of 0.3 percent based on the mass of absolutely dry sludge for hardening and tempering the sludge; feeding the hardened and tempered sludge of which the moisture content is 99 percent into a flotation sludge concentrator through a pump for concentrating; feeding the concentrated sludge into a sludge hardening and tempering tank through a pump, adding caustic lime in an amount of 15 percent based on the mass of the absolutely dry sludge and polyaluminium chloride in an amount of 5 percent of based on mass of the absolutely dry sludge for further hardening and tempering; and performing filter pressing on the further hardened and tempered sludge by adopting a high-pressure diaphragm plate filter press. The method has the advantages of high system automatic degree, high concentration efficiency, low energy consumption, low mud moisture content and capability of making obtained sludge directly meet a filling requirement.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge concentration and dehydration treatment method. technical background [0002] Sludge treatment is the process of sludge stabilization, reduction and harmlessness. Sludge treatment includes: concentration, dehydration, semi-drying, drying, anaerobic digestion and other treatment technologies. Among them, sludge concentration and dehydration are the first step in drying sludge. It has a great effect on reducing the volume of sludge for subsequent treatment (that is, volume reduction of sludge), facilitating sludge transportation and maintaining the normal operation of subsequent treatment processes. Significance. [0003] At present, the commonly used technologies for sludge pre-concentration include gravity concentration, flotation concentration, belt concentration, drum concentration, and centrifugal concentration. Among them, gravity concentration has problems such as l...

Claims

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Application Information

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IPC IPC(8): C02F11/14B01D25/164
Inventor 楼洪海赵洪启戴文强刘祥虎徐俊杰陈来顺
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
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