Excess sludge treatment method

A technology of excess sludge and treatment method, applied in sludge treatment, water/sludge/sewage treatment, sludge treatment through temperature control, etc., can solve the problems of high energy consumption, long anaerobic time, etc., and achieve antibacterial effect High efficiency, reducing removal resistance and reducing drying energy consumption

Active Publication Date: 2021-07-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also problems such as high energy consumption and long anaerobic time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 500kg of surplus sludge raw material and join in the homogenization tank, add the chlorhexidine of 0.4wt% TS sludge and the thimycin of 1.0wt% TS sludge and the nitrous acid of 0.5wt% TS sludge therein Add sodium, and add 0.15wt% octylphenol polyoxyethylene ether of TS sludge, stir in the homogenization tank for 30 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 , the VSS reduction rate of the sludge after breaking the wall was 48.4%, and the SCOD increased to 39.2 times that of the original sludge. After the wall was broken, the sludge was centrifugally dehydrated, and the moisture content of the sludge after dehydration was 58.1%. The unit is further processed. After dehydration, the mud cake enters the filter press to be pressed into 3mm strips. The sludge enters the solar multi-layer mesh belt low-temperature drying box through the conveyor belt. The carrier gas i...

Embodiment 2

[0031]Basically the same as Example 1, the difference is that the treating agent is chlorhexidine of 0.5wt% TS sludge, thiamycin of 1.5wt% TS sludge and sodium nitrite of 1.0wt% TS sludge, And add 0.5wt% octylphenol polyoxyethylene ether of TS sludge, stir and react for 20 minutes, then add thermal hydrolysis reactor and feed 1.0MPa saturated steam until the sludge temperature reaches 160°C, and react for 40 minutes. After wall breaking, the VSS reduction rate of the sludge was 50.8%, and the SCOD increased to 42.5 times that of the original sludge. After wall breaking and dehydration, the moisture content of the sludge reached 55.7%, and the moisture content of the remaining sludge after final drying dropped to 11.7%.

Embodiment 3

[0033] It is basically the same as Example 1, except that the treatment agent is chlorhexidine of 0.6wt% TS sludge and thiamycin of 2.0wt% TS sludge, and adding sodium sulfite and 1.2wt% octylphenol polyoxyethylene ether of TS sludge, stirred and reacted for 30 minutes, then added to the thermal hydrolysis reactor and fed with 1.0MPa saturated steam until the sludge temperature reached 170°C, and reacted for 50 minutes. After wall breaking, the VSS reduction rate of the sludge was 52.7%, and the SCOD increased to 48.3 times that of the original sludge. After wall breaking and dehydration, the moisture content of the sludge reached 52.2%, and the moisture content of the remaining sludge after final drying dropped to 10.8%.

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Abstract

The invention discloses an excess sludge treatment method. The treatment method comprises the following steps: (1) making excess sludge contact with a treatment agent for treatment; (2) making the material treated in the step (1) contact with saturated steam for treatment; (3) dehydrating the reacted material in the step (2) to obtain treated sludge and sewage, and forming and drying the treated sludge to obtain dried sludge. According to the method, the water content of the residual sludge can be reduced to 15% or below, the volume of the sludge is greatly reduced, and the dried sludge can be used as a further recycling raw material or incinerated.

Description

technical field [0001] The invention relates to a process for treating excess sludge, in particular to a process for wall-breaking and drying excess sludge. Background technique [0002] In the water treatment process, the activated sludge process (Activated sludge process) is the key technology for the treatment of municipal sewage and industrial wastewater. With the improvement of urban sewage treatment capacity, the output of sludge is also increasing. The treatment and disposal of excess sludge can account for 50% to 60% of the cost of sewage treatment plants, and sludge dewatering is an effective measure to reduce sludge volume and treatment costs. How to improve sludge dewatering efficiency has attracted increasing attention. The bottleneck of pretreatment lies in the presence of cell walls and extracellular polymers that make it difficult to release the water inside the cells. Extracellular polymer (EPS) is a polymer that widely exists outside the cells of microbial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/121C02F11/122C02F11/123C02F11/127C02F11/13C02F11/148C02F11/18
CPCC02F11/00C02F11/18C02F11/148C02F11/127C02F11/122C02F11/123C02F11/121C02F11/13C02F2303/06C02F2303/04
Inventor 吴巍回军孙浩程
Owner CHINA PETROLEUM & CHEM CORP
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