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Anaerobic gas making process for excess activated sludge

A residual activity and sludge technology, applied in sludge treatment, biological sludge treatment, electrochemical sludge treatment, etc., can solve the problems of low methane production, slow hydrolysis steps, and long start-up time.

Active Publication Date: 2018-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has the problems of long start-up period and low methane production in the hydrolysis step.

Method used

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  • Anaerobic gas making process for excess activated sludge
  • Anaerobic gas making process for excess activated sludge
  • Anaerobic gas making process for excess activated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The specific example of the present invention is illustrated by taking the excess sludge of a certain urban sewage treatment plant as an example. Take 10kg of excess sludge for dehydration treatment until the volume moisture content is 85.02%, put the dehydrated sludge into the electrolytic cell, add 4g of polyether modified trisiloxane and 8g of 10% ethylenediaminetetraacetic acid to it , add the auxiliary agent polymycin 2g, after stirring, the electrolytic cell is electrified, at 10mA / cm 2 , under 200HZ for 1h, the residual activated sludge raw material and sludge after electrolytic treatment were sampled and analyzed for sludge composition as shown in Table 1. The electrolytically treated sludge is sent to the anaerobic reactor. Add the inoculum sludge to the reactor, the amount of the inoculation sludge is 1 / 5 of the volume of the remaining sludge, the inoculum sludge comes from the anaerobic digestion tank of a municipal sewage treatment plant, and the supernatan...

Embodiment 2

[0034] It is basically the same as Example 1, except that the wall-breaking agent is 10 g of polyether-modified trisiloxane and 6 g of 15% ethylenediamine tetraacetic acid, and 2 g of polymycin and nikkomycin are added as auxiliary agents. Gas production started after 8 days. See Table 3 for the sludge composition after pretreatment, and Table 4 for the gas composition.

[0035] Table 3 Sludge composition before and after pretreatment of excess sludge

[0036]

[0037] Table 4 Composition analysis table of produced gas

[0038]

Embodiment 3

[0040] It is basically the same as Example 1, except that the wall-breaking agent is 5 g of polyether-modified trisiloxane and 8 g of 15% ethylenediamine tetraacetic acid, and 2 g of nikkomycin is added. Gas production started after 10 days. The sludge composition after pretreatment is shown in Table 5, and the gas composition is shown in Table 6.

[0041] Table 5 Sludge composition before and after pretreatment of excess sludge

[0042]

[0043] Table 6 Composition analysis table of gas production

[0044]

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Abstract

The invention discloses an anaerobic gas making process for excess activated sludge. According to the process, the excess activated sludge is subjected to mechanical dewatering firstly and then fed into an electrolytic cell for further dewatering under the action of a treating agent, then the sludge is fed into an anaerobic reactor, anaerobic granular sludge is added for an inoculation reaction, biogas residues and biogas are obtained after the reaction, part of the biogas residues serve as seed sludge of next batch of fermented sludge, and the remaining biogas residues are subjected to dryingtreatment. Excess sludge is reduced, and biogas resources are recovered.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to an anaerobic gas production process from surplus activated sludge. Background technique [0002] Residual activated sludge refers to the solid waste produced by each treatment unit in the sewage treatment process. It is a floc composed of bacterial micelles formed by various microorganisms, inorganic substances, and adsorbed organic substances. It is a by-product of the sewage treatment system. . In addition to water and organic matter, sludge also contains a large number of toxic and harmful substances such as parasite eggs, pathogens, and heavy metals, and is often accompanied by malodorous gases, which can easily cause secondary pollution. [0003] Compared with other residual sludge treatment methods, the anaerobic digestion technology of sludge has the advantages of low energy consumption, recyclable energy, improved sludge dehydration, sterilization, and good stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C02F11/04
CPCC02F11/006C02F11/04C02F11/12C02F11/121C02F11/122C02F11/123C02F11/127Y02E50/30
Inventor 吴巍回军冯文龙李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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