A method for wall-breaking anaerobic drying treatment of excess activated sludge

A treatment method and technology for excess sludge, applied in chemical instruments and methods, dehydration/drying/concentrated sludge treatment, sludge treatment, etc., to reduce the critical micelle concentration, improve wall breaking efficiency, and reduce the amount of treatment agent Effect

Active Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still problems such as drug dosage and gas production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The specific embodiment of the present invention will be described by taking the dewatered surplus sludge of a sewage treatment plant as an example. Add 0.04% TS sludge (TS is the total solid content of sludge) triclocarban, 0.2% TS sludge nonylphenol polyoxyethylene ether and 0.1% TS sludge aluminum chloride and 0.18% TS sludge imipenem, stirred for 1 hour, added 3.5% sludge volume 20mM EDTA and 5% sludge volume 36% to the treated sludge Sucrose solution, stir for 20 minutes, quickly add ice water 4 times the volume of sludge, and equilibrate for 20 minutes. Compared with the VSS of the raw sludge with the same moisture content, the VSS of the sludge after breaking the wall was reduced by 27.11%, and the SCOD increased by 34.28 times. After the wall is broken, the sludge is passed into the anaerobic fermentation tank, and anaerobic granular sludge of 1 / 8 of the remaining sludge volume is added for anaerobic digestion, and the anaerobic digestion temperature is control...

Embodiment 2

[0030] With the surplus sludge raw material of embodiment 1, selected treatment process is the same as embodiment 1, adds the triclocarban of 0.08%TS sludge, 0.7%TS sludge to 500kg this kind of dewatered surplus sludge with moisture content of 82.30% The nonylphenol polyoxyethylene ether of the sludge, the aluminum chloride of 0.5% of the TS sludge and the meropenem of 0.6% of the TS sludge were stirred for 1 hour, and 4% of the sludge volume 20mM EDTA and 36% sucrose solution with 7% sludge volume, stir well for 20 minutes, then quickly add ice water with 3 times the sludge volume, and equilibrate for 30 minutes. Compared with the VSS of the raw sludge with the same moisture content, the VSS of the sludge after breaking the wall was reduced by 29.47%, and the SCOD increased by 35.01 times. After the wall is broken, the sludge is passed into the anaerobic fermentation tank, and anaerobic granular sludge of 1 / 7 of the remaining sludge volume is added for anaerobic digestion. Th...

Embodiment 3

[0032] With the surplus sludge raw material of embodiment 1, selected treatment process is the same as embodiment 1, adds the triclocarban of 0.16%TS sludge, the triclocarban of 1.25%TS sludge to 500kg this kind of moisture content 82.30% dewatered surplus sludge The nonylphenol polyoxyethylene ether of mud, the aluminum chloride of 1% TS sludge and the panipenem of 1.25% TS sludge were stirred for 1 hour, and 4.5% of sludge volume 20mM was added to the treated sludge. EDTA and 36% sucrose solution with 8% sludge volume were stirred evenly for 20 minutes, then ice water 4 times the sludge volume was quickly added, and the equilibrium time was 30 minutes. Compared with the VSS of the raw sludge with the same moisture content, the VSS of the sludge after breaking the wall was reduced by 32.49%, and the SCOD increased by 37.24 times. 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 vo...

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Abstract

The invention discloses a method for treating excess activated sludge by anaerobic drying of broken walls. In the method, firstly, the excess activated sludge is sent into a broken wall homogenization tank, mixed with a treatment agent for treatment, and the obtained The sludge is broken by osmotic pressure impact, and the broken wall is sent to the sludge anaerobic fermentation tank for anaerobic gas production, biogas recovery, and the anaerobic sludge is sent to the sludge dehydrator for dehydration, and the obtained dehydrated cake After molding treatment, it is 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 active sewage, which belongs to the field of environmental protection, and in particular to an anaerobic drying treatment method for excess sludge. Background technique [0002] With the rapid development of my country's economy and the acceleration of industrialization and urbanization, a large amount of industrial wastewater and domestic sewage generated every year need to be treated urgently. Activated sludge process is currently the most widely used water treatment technology at home and abroad. While the demand for it is increasing, it will inevitably produce a large amount of excess sludge. Excess sludge contains a large number of toxic and harmful substances, such as parasite eggs, pathogenic microorganisms, bacteria, synthetic organic matter and heavy metal ions, etc. The resulting odor and organic pollution have become a major public hazard for urban environmental sanitation. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/00C02F11/13C02F11/148
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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