Method for improving dewatering performance of excess sludge

A technology of dewatering performance and excess sludge, applied in water/sludge/sewage treatment, sludge treatment, oxidation treatment of sludge, etc., can solve the problem of reduced sludge particle size, high cost, and increased sludge dewatering time, etc. problem, to achieve the effect of weakening the resistance

Active Publication Date: 2017-05-10
浙江欧可美科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, a single Fenton oxidation technology to treat sludge not only requires a large amount of Fenton reagent, but also costs more
Moreover, in the sludge system, because of the severe oxidation process, the sludge particle size is reduced and the sludge dehydration time is increased.

Method used

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  • Method for improving dewatering performance of excess sludge
  • Method for improving dewatering performance of excess sludge
  • Method for improving dewatering performance of excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take the biochemical sludge with a moisture content of 98.2% and pour it into the water tank, adjust the pH=3.0, add the conditioner Fe 2+ , the addition amount is 0.05w% of the absolute dry weight of the sludge, and then add the conditioner H 2 o 2, the addition amount is 0.05w% of the absolute dry weight of the sludge, start the water conservancy cavitation device, and circulate for 10 minutes. The treated sludge is put into the high-pressure membrane filter press for dehydration (the parameters of this process and the performance parameters of the high-pressure membrane filter press also need to be explained), after dehydration, the moisture content of the sludge reaches 53.1%, and the solid content decreases by 18.4%. .

Embodiment 2

[0041] Take the biochemical sludge with a moisture content of 98.5% and pour it into the water tank, adjust the pH=3.0, add the conditioner Fe 2+ , the added amount is 0.08w% of the absolute dry weight of the sludge, and the conditioner H is added 2 o 2 , the addition amount is 0.08w% of the absolute dry weight of the sludge, start the water conservancy cavitation device, and circulate for 10 minutes. The treated sludge is put into a high-pressure diaphragm filter press for dehydration. After dehydration, the moisture content of the sludge reaches 52.2%, and the solid content decreases by 19.8%.

Embodiment 3

[0043] Take the biochemical sludge with a water content of 97.9% and pour it into the water tank, adjust the pH=3.0, add the conditioner Fe 2+ , the addition amount is 0.1w% of the absolute dry weight of the sludge, and then add the conditioner H 2 o 2 , the addition amount is 0.1w% of the absolute dry amount of sludge, start the water conservancy cavitation device, and circulate for 10 minutes. The treated sludge is put into a high-pressure diaphragm filter press for dehydration. After dehydration, the moisture content of the sludge reaches 50.8%, and the solid content decreases by 20.2%.

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a method for improving the dewatering performance of excess sludge. Firstly, the pH value is regulated by acid liquid; Fe<2+> and H2O2 are added; then, hydraulic cavitation treatment is used; further, bound water, absorbed water, interstitial water and free water in sludge are partially removed; the water content in the sludge is further reduced to a value about 50 percent from 98 percent or more; the solid content is reduced by about 20 percent; the capillary tube water absorption time of the sludge is reduced; the content of polysaccharide and protein in sludge treatment supernate is improved; the sludge dewatering performance and the dehydrated water quality are improved; the operation method is simple; the energy consumption is low; the cost is low.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for improving the dewatering performance of excess sludge. Background technique [0002] Residual sludge is an inevitable by-product after sewage treatment. In recent years, with the growth of urban population and the continuous improvement of municipal service facilities, the total amount of sewage treatment in my country has continued to increase every year, and the sludge output has also increased. As of now, there are more than 4,000 sewage treatment plants in operation in my country, the treated sewage reaches 1.5×108m3 / d, and the annual output of residual sludge (with a moisture content of 80%) is nearly 35 million tons. The Notice on the Prevention and Control of Sludge Pollution in Urban Sewage Treatment Plants requires that "sewage treatment plants that transport sludge to the factory for the purpose of storage (that is, without treatment and disposal) ...

Claims

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Application Information

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IPC IPC(8): C02F11/06C02F11/12C02F11/00
CPCC02F11/00C02F11/06C02F11/122C02F2303/06
Inventor 蔡美强鲁伟陈海锋胡建强罗德纹包建宏林孝鑫徐佳慧濮丽娜孟小帅熊智勇吴费强
Owner 浙江欧可美科技股份有限公司
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