A method for treating excess activated sludge

A technology of residual activity and sludge, applied in the directions of pyrolysis sludge treatment, sludge treatment, chemical instruments and methods, etc., can solve problems such as energy loss, and achieve the effect of increasing gas production, decreasing sludge VSS and increasing SCOD.

Active Publication Date: 2022-02-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the utilization of solar energy resources, the system still has the problem of energy loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific embodiment of the present invention will be described by taking the excess sludge of a certain sewage treatment plant as an example. Add 500kg of the excess sludge with a moisture content of 98.16% to the electrolytic cell, add penicillin with 0.5% TS sludge (TS is the total solid content of the sludge) and 0.2% dichlorodimethyl Add 0.15% aluminum chloride of TS sludge to hydantoin, stir in the homogenization tank for 20 minutes, then pass it into the pyrolysis reactor, pass 1.0MPa saturated steam until the temperature of the sludge is 130°C, and react for 40 minutes. After the wall is broken, the sludge The reduction rate of mud VSS is 33.58%, and the increase of SCOD is 22.44 times of the original mud. After the wall is broken, the sludge is centrifugally dehydrated. The moisture content of the dehydrated sludge is 64.15%. The sewage is discharged into the biochemical unit of the sewage treatment plant for further treatment. After dehydration, the mud cak...

Embodiment 2

[0023] Substantially the same as Example 1, the difference is that the treatment agent is 2.5% TS sludge penicillin and 0.6% TS sludge dichlorodimethylhydantoin and aluminum chloride 1% TS sludge is added, stirred for 20 minutes Then add the thermal hydrolysis reactor and feed 1.0MPa saturated steam until the sludge temperature reaches 140°C, and react for 30 minutes. After wall breaking, the VSS reduction rate of the sludge was 40.22%, and the SCOD increased to 29.47 times that of the original sludge. After wall breaking and dehydration, the moisture content of the sludge reached 58.32%, and the moisture content of the remaining sludge after final drying dropped to 10.9%.

Embodiment 3

[0024]Embodiment 3 is basically the same as Example 1, except that the treatment agent is the penicillin of 5% TS sludge and the dichlorodimethylhydantoin of 1% TS sludge and the aluminum chloride that adds 2% TS sludge, After stirring and reacting for 20 minutes, it was added to a thermal hydrolysis reactor and 1.0 MPa saturated steam was introduced until the temperature of the sludge reached 140°C, and the reaction was carried out for 30 minutes. After wall breaking, the VSS reduction rate of the sludge was 47.37%, and the SCOD increased to 33.05 times that of the original sludge. After wall breaking and dehydration, the moisture content of the sludge reached 58.32%, and the moisture content of the remaining sludge after final drying dropped to 9.2%.

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Abstract

The invention discloses a method for treating excess activated sludge. In the method, the excess activated sludge is first sent into a homogenization tank, and then a treatment agent is added into the homogenization tank, and the treated sludge is thermally hydrolyzed to break the wall For treatment, the broken sludge is sent to a sludge dehydrator for dehydration to obtain dewatered cakes and sewage. The sewage is sent to a sewage plant for further treatment, and the obtained dehydrated cakes are formed and dried to obtain dried sludge. The method of the invention can reduce the moisture content of the excess sludge to below 15%, greatly reducing the volume of the sludge, and the dried sludge can be used as further resource raw materials or incinerated.

Description

technical field [0001] The invention relates to a process for treating excess activated sludge, in particular to a process for wall-breaking and drying excess sludge. Background technique [0002] In the process of sewage treatment, the amount of sludge produced is very large, and its amount accounts for about 0.3% to 0.5% of the treated water (calculated with a water content of 97%). Excess sludge is a by-product of wastewater biological treatment, which is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. The moisture content of the remaining sludge can reach more than 99%. The composition of the sludge is very complex and highly variable. It contains a large amount of organic matter, pathogenic microorganisms, heavy metals, organic matter, nitrogen, phosphorus and other eutrophic elements and other harmful substances. Most of the sewage treatment plant sludge only undergoes conventional dehydration tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/121C02F11/13
Inventor 吴巍回军孙浩程刘春阳李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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