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Catalytic oxidation type sludge conditioner and sludge conditioning method

A technology for sludge conditioning and catalytic oxidation, which is applied in the oxidation treatment of sludge, sludge treatment, chemical instruments and methods, etc. Serious capacity expansion, less dosage of chemicals, and improved dehydration performance

Inactive Publication Date: 2019-08-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the shortcomings of the existing chemical conditioning sludge dewatering technology, such as large dosage of conditioning agent and serious sludge volume increase, and provide a catalytic oxidation type with less dosage of conditioning agent and no sludge volume expansion. Sludge conditioner and conditioning method for sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment utilizes the conditioning method of catalytic oxidation type conditioning agent, comprises the following steps:

[0028] 1) Add the sludge into the sludge agitator, the sludge is the residual sludge of the secondary settling tank, with a water content of 99.2%, TSS 7.3g / L, VSS 5.3g / L, and pH 7.0;

[0029] 2) Add cobalt chloride and potassium monopersulfate compound salt, the amount of cobalt chloride added is 0.8 mg cobalt ion / liter of sludge, and the amount of active ingredients in potassium monopersulfate compound salt added to sludge It is 3.6mg potassium hydrogen persulfate per liter of sludge, then stir and mix, the stirring speed is 200 rpm, and the stirring time is 30 minutes;

[0030] 3) Add the coagulant polyaluminum chloride, the weight ratio of the added polyaluminum chloride is 12.0% of the absolute dry sludge, and then stir and mix, the stirring speed is 100 rpm, and the stirring time is 1 minute;

[0031] 4) Then add flocculant poly...

Embodiment 2

[0034] The present embodiment utilizes the conditioning method of catalytic oxidation type conditioning agent, comprises the following steps:

[0035] 1) Add the sludge into the sludge agitator, the sludge is the residual sludge of the secondary settling tank, its water content is 99.1%, TSS 7.4g / L, VSS 5.4g / L, pH 6.9;

[0036] 2) Add cobalt chloride and potassium monopersulfate compound salt, the amount of cobalt chloride added is 0.7mg cobalt ion / liter of sludge, the amount of active ingredients in the potassium monopersulfate compound salt added to the sludge 3.9 mg of potassium hydrogen persulfate per liter of sludge, then stirred and mixed, the stirring speed was 200 rpm, and the stirring time was 30 minutes;

[0037] 3) Add the coagulant polyaluminum chloride, the weight ratio of the added polyaluminum chloride is 12.6% of the absolute dry sludge, and then stir and mix, the stirring speed is 100 rpm, and the stirring time is 1 minute;

[0038] 4) Then add the flocculant...

Embodiment 3

[0041] The present embodiment utilizes the conditioning method of catalytic oxidation type conditioning agent, comprises the following steps:

[0042] 1) Add the sludge to the sludge agitator, the sludge is the residual sludge of the secondary settling tank, its water content is 99.3%, TSS 7.2g / L, VSS 5.2 g / L, pH 6.8;

[0043]2) Add cobalt chloride and potassium monopersulfate compound salt, the amount of cobalt chloride added is 0.8 mg cobalt ion / liter of sludge, and the amount of active ingredients in potassium monopersulfate compound salt added to sludge 3.8mg potassium hydrogen persulfate per liter of sludge, then stir and mix, the stirring speed is 200 rpm, and the stirring time is 30 minutes;

[0044] 3) Add the coagulant polyaluminum chloride, the weight ratio of the added polyaluminum chloride is 13.0% of the absolute dry sludge, and then stir and mix, the stirring speed is 100 rpm, and the stirring time is 1 minute;

[0045] 4) Then add flocculant polyacrylamide, the...

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Abstract

The invention discloses a catalytic oxidation type sludge conditioner and a sludge conditioning method. The catalytic oxidation type sludge conditioner comprises an oxidant, a catalyst, a coagulant and a flocculating agent, wherein the oxidant is a peroxymonohydrosulfate composite salt, the catalyst is a cobalt salt, the coagulant is polyaluminum chloride, and the flocculating agent is polyacrylamide. According to the sludge conditioning method, sludge is conditioned by the catalytic oxidation type sludge conditioner, and the dewatering performance of the sludge is improved; in cooperation with mechanical dewatering, the water content of the discharged sludge is lowered to 60% or below. Meanwhile, the method solves the problems that the addition quantity of conditioners is large and the capacity of sludge is increased a lot in existing chemical sludge conditioning technologies; the method is beneficial to sludge disposal.

Description

technical field [0001] The invention relates to a catalytic oxidation type sludge conditioner and a sludge conditioning method. Background technique [0002] With the development of urbanization, the amount of sludge in my country's municipal sewage treatment continues to increase. The moisture content of the sludge exceeds 97%, and the moisture content of the sludge after direct dehydration is still around 90%. Sludge has a high moisture content and a large volume, which brings great difficulties to the later sludge treatment and disposal. [0003] Chemical conditioners are widely used in sludge dewatering technology, and conditioning agents such as lime, fly ash, and iron salts are used in traditional sludge dewatering technology. This traditional sludge dewatering technology requires a large amount of conditioning agent, serious sludge volume increase, and high cost, which brings many difficulties to the later sludge disposal. Contents of the invention [0004] The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/147C02F11/06C02F11/122
CPCC02F11/06C02F11/122C02F11/14
Inventor 黄新文范爽杨万全徐璐朱舒懿
Owner ZHEJIANG UNIV OF TECH
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