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Method for relieving restriction of sulfate reduction to anaerobic digestion methane production process

An anaerobic digestion and sulfate technology, applied in biological sludge treatment, waste fuel, fermentation, etc., can solve the problems affecting the growth and activity of methanogenic bacteria, the utilization of methanogenic bacteria, etc., to eliminate adverse effects and increase methane production , good chelating effect

Inactive Publication Date: 2008-04-09
JIANGNAN UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

It has been reported that the above-mentioned trace metal elements are very easy to react with hydrogen sulfide produced in the sulfate reduction process to form insoluble metal precipitates, so that they cannot be used by methanogens, affecting the growth and activity of methanogens, thereby inhibiting anaerobic fermentation. Biogas production process

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The substrate waste biomass is calculated as acetate, the concentration is 7g / L, the COD concentration is 4500mg / L, the temperature is 30-35°C, the COD:N:P is 200:5:1, and the initial sludge concentration is 5 gVSS / L, the initial pH is 6.5, the sulfate concentration is 1700mg / L, and the addition amount of nitrilotriacetic acid is 10μM, which is added at the initial stage of fermentation. Under the same experimental conditions and measurement methods, when the fermentation ended, the methane production rate and sulfate reduction rate of the control sample were 0.24m 3 / kgCOD and 48%, while the methane production rate and sulfate reduction rate were 0.36 m 3 / kgCOD and 22%, the methane yield increased by 50%, and the sulfate reduction rate decreased by 54%.

Embodiment 2

[0016] The substrate waste biomass is calculated as acetate, the concentration is 7g / L, the COD concentration is 4500mg / L, the temperature is 30-35°C, the COD:N:P is 200:5:1, and the initial sludge concentration is 5 gVSS / L, the initial pH was 6.5, the sulfate concentration was 650 mg / L, and the addition amount of nitrilotriacetic acid was 10 μM, which was added on the 5th day after fermentation. Under the same experimental conditions and measurement methods, at the end of fermentation, the methane production rate and sulfate reduction rate of the control sample were 0.39m 3 / kgCOD and 24%, while in the test of adding nitrilotriacetic acid, the methane production rate and sulfate reduction rate were 1.01m 3 / kgCOD and 1%, the methane yield increased by 159%, and the sulfate reduction rate decreased by 96%.

Embodiment 3

[0018] The substrate waste biomass is calculated as acetate, the concentration is 10g / L, the COD concentration is about 6900mg / L, the temperature is 30-35°C, the COD:N:P is 200:5:1, and the initial sludge concentration is 8gVSS / L, the initial pH was 7.0, the sulfate concentration was 4300 mg / L, and the amount of nitrilotriacetic acid added was 100 μM, which was added at the initial stage of fermentation. Under the same experimental conditions and measurement methods, at the end of fermentation, the methane production rate and sulfate reduction rate of the control sample were 0.20m 3 / kgCOD and 32%, while in the test of adding nitrilotriacetic acid, the methane production rate and sulfate reduction rate were 0.28m 3 / kgCOD and 20%, the methane yield increased by 40%, and the sulfate reduction rate decreased by 38%.

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Abstract

The invention relates to a method for removing the sulfate reduction inhibition of anaerobic digestion marsh gas production, pertaining to the offal biological treatment technical field. The content of the invention is to add nitrilotriacetic acid or a sodium salt thereof to an anaerobic digestion reactor to act with trace metal element and then form dissoluble chelate, thus avoiding hydrogen sulfide produced by sulfate reduction in the reactor forming precipitate with metal ion, therefore raising the biological exploitability of trace metal element and providing sufficient nutrition for methanogen, leading trace metal element to predominate in competition with sulfate reducing bacteria and then convert fermentation substrate into marsh gas more thoroughly and solving the problem of environmental pollution of degradable things in offal containing sulfate. Owing to the extreme micro-amount of nitrilotriacetic acid, the method is not only convenient to be manipulated with high efficiency, but also low in cost which leads the invention to be extensively applicable in engineering practice.

Description

technical field [0001] A method for removing the inhibition of sulfate reduction on anaerobic digestion biogas production process, involving a method of inhibiting sulfate reduction by adding a small amount of nitrilotriacetic acid or its sodium salt in an anaerobic reactor, thereby maximizing the conversion of organic matter into biogas The method belongs to the technical field of waste biological treatment. Background technique [0002] During the anaerobic digestion process of sulfate-containing waste biomass (such as: municipal sludge, high-concentration organic wastewater, organic components in municipal waste, etc.), the sulfate concentration has an important impact on the digestion reaction. Excessively high sulfate concentration often inhibits the process of methane production, resulting in a decrease in biogas production or even no biogas production. At the same time, a large amount of hydrogen sulfide gas is produced with the reduction of sulfate. [0003] Trace m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30
Inventor 陈坚李秀芬胡庆昊堵国成
Owner JIANGNAN UNIV
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