A kind of process method of anaerobic drying treatment of excess activated sludge

A process method and residual activity technology, applied in pyrolysis treatment of sludge, chemical instruments and methods, dewatering/drying/concentrating sludge treatment, etc., can solve the problem of high investment cost of ultrasonic device, difficult large-scale application and high treatment cost problems, to achieve the effect of saving energy consumption, reducing consumption, and reducing sludge VSS

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, the ultrasonic device used in this invention has risks such as high investment costs and high processing costs, and it is difficult to apply it on a large scale to the current situation of surplus sludge pretreatment in my country.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 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 penicillin with 0.35% of TS sludge (TS is the total solid content of sludge) and dichlorodimethylhydantoin with 0.2% of TS sludge to 200kg of excess sludge with a moisture content of 96.5%, and add 0.2% The aluminum chloride of TS sludge was stirred and reacted for 10 minutes, then added to the thermal hydrolysis reactor, and 1.0 MPa saturated steam was introduced until the temperature of the sludge reached 120°C, and the reaction was carried out for 30 minutes to break the wall. After the wall was broken, the VSS reduction rate of the sludge was 33.81 %, the SCOD increase value is 33.11 times that of the original sludge. After the wall is broken, the sludge is passed into the anaerobic fermentation tank, and anaerobic granular sludge of 1 / 6 of the remaining sludge volume is added for anaerobic digestion. Controlling the ...

Embodiment 2

[0028] The raw materials and process are the same as in Example 1, except that 2% TS sludge penicillin and 0.6% TS sludge dichlorodimethylhydantoin are added to this excess sludge, and 1% TS sludge is added aluminum chloride, other conditions are the same as in Example 1, the thermal hydrolysis temperature is 140 ° C, and the reaction is 20 minutes. After the wall is broken, the VSS reduction rate of the sludge is 45.96%, and the SCOD added value is 42.97 times that of the original sludge. After the wall is broken, the sludge is passed into the anaerobic fermentation tank, and anaerobic granular sludge of 1 / 6 of the remaining sludge volume is added for anaerobic digestion. After 12 days of anaerobic digestion, the cumulative methane production of anaerobic digestion increased by 53.21% compared with direct anaerobic digestion of raw mud. After digestion, the sludge is centrifugally dewatered, and the moisture content of the sludge is reduced to 56.8% after dehydration. The sew...

Embodiment 3

[0030] The raw materials and process are the same as in Example 1, except that 5% penicillin of TS sludge and dichlorodimethylhydantoin of 1% TS sludge are added to this kind of excess sludge, and 2% TS sludge is added aluminum chloride, other conditions are the same as in Example 1, the thermal hydrolysis temperature is 150 ° C, and the reaction is 40 minutes. After the wall is broken, the VSS reduction rate of the sludge is 54.96%, and the SCOD added value is 49.97 times that of the original sludge. After the wall is broken, the sludge is passed into the anaerobic fermentation tank, and anaerobic granular sludge of 1 / 6 of the remaining sludge volume is added for anaerobic digestion. After 12 days of anaerobic digestion, the cumulative methane production of anaerobic digestion increased by 57.21% compared with direct anaerobic digestion of raw mud. After digestion, the sludge is centrifugally dewatered, and the water content of the sludge is reduced to 52.8% after dehydration...

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Abstract

The invention discloses a process method for anaerobic drying treatment of excess activated sludge. In the process method, the excess activated sludge is first sent into a homogenization tank, and then a treatment agent is added into the homogenization tank. The sludge is sent to the thermal hydrolysis reactor, and the sludge after thermal hydrolysis treatment enters the sludge anaerobic fermentation tank for high-temperature anaerobic gas production, biogas recovery, and the anaerobic sludge is sent to the sludge dehydrator for dehydration , the resulting dehydrated cake is molded and dried to obtain dried sludge. The method of the invention can reduce the moisture content of the remaining sludge to below 15%, greatly reducing the volume of the sludge, and the drying energy consumption is self-sufficient, and the drying sludge can be used as a further resource raw material or incinerated.

Description

technical field [0001] The invention relates to a method for treating excess activated sludge, in particular to an anaerobic drying treatment method for excess sludge. Background technique [0002] Due to the cost-effectiveness of the activated sludge process, it has become the preferred sewage treatment technology for many sewage treatment plants. During the sewage activated sludge process, a variety of microorganisms in the activated sludge remove the organic pollutants and suspended solid pollutants in the sewage, and decompose them into water, carbon dioxide and tiny flocculent suspended matter. The excess activated sludge that has completed sewage treatment and its attached suspended matter can be separated and discharged out of the sewage system through sedimentation to become excess activated sludge. Therefore, in addition to water and organic matter, the remaining activated sludge also contains a large number of toxic and harmful substances such as parasite eggs, pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/122C02F11/127C02F11/123C02F11/121C02F11/13C02F11/10
CPCY02E50/30
Inventor 吴巍回军孙浩程刘春阳李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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