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Method for accelerating anaerobic fermentation of organic waste water or organic castoff to prepare sludge gas

A technology for organic waste and organic waste water, applied in fermentation, waste fuel, anaerobic digestion treatment, etc., can solve the problems of inability of metal elements, utilization of methanogens, etc., to improve bioavailability, increase methane production, and operate efficiently Effect

Inactive Publication Date: 2008-12-10
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, since wastewater or waste and its treatment process often produce or contain sulfide, and sulfide and some other anions such as phosphate and carbonate can form precipitation with metal ions, the metal elements in the form of precipitation cannot be absorbed by methanogens. utilized, it is therefore important to maintain a certain amount of bioavailable trace metals in the anaerobic reactor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The substrate is calculated as acetate, the concentration is 7g / L, the COD concentration is about 4500mg / L, the temperature is 30-35°C, the COD:N:P is 200:5:1, and the initial sludge concentration is 5gVSS / L. The initial pH was 6.5, and the amount of nitrilotriacetic acid added was 10 μmol / L, which was added at the initial stage of fermentation. Under the same experimental conditions and measurement methods, at the end of fermentation, in the test of adding nitrilotriacetic acid, the methane production rate was 0.43m 3 / kgCOD, which is 48% higher than that of the control example.

Embodiment 2

[0016] The substrate 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 6gVSS / L. The initial pH was 7.5, and the amount of citric acid added was 10 μmol / L, which was added at the initial stage of fermentation. Under the same experimental conditions and measurement methods, at the end of fermentation, in the test of adding citric acid, the methane production rate was 0.39m 3 / kgCOD, which is 34% higher than that of the control example.

Embodiment 3

[0018] The substrate is calculated as acetate, the concentration is 7g / L, the COD concentration is about 9800mg / L, the temperature is 30-35°C, the COD:N:P is 200:5:1, and the initial sludge concentration is 5gVSS / L. The initial pH was 7.0, and the amount of ethylenediaminetetraacetic acid added was 100 μmol / L, which was added at the initial stage of fermentation. Under the same experimental conditions and measurement methods, at the end of the fermentation, in the test of adding EDTA, the methane yield was 0.40m 3 / kgCOD, which is 38% higher than that of the control example.

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Abstract

The invention relates to a method for promoting the anaerobic fermentation of organic waste water or organic wastes to produce biogas, belonging to the wastes biological treatment technical field. The method takes simulated organic waste water as a treatment object, and adds a trace metallic element sequestering agent into an anaerobic reactor to improve the bioavailability of the trace metallic element necessary for methanogens and to promote the growth and activity of the methanogens, thereby improving the methane yield and the contaminant conversion rate of a system. As the addition mount of the trace metallic element sequestering agent is very low, the method has not only simple and highly efficient operation, but also low cost, and can be expected to be widely applied to engineering practices.

Description

technical field [0001] A method for promoting the anaerobic fermentation of organic wastewater or organic waste to produce biogas, involving a method of promoting the maximum conversion of organic matter into methane by adding trace metal element chelating agents necessary for methanogens to an anaerobic reactor, belonging to organic Waste biological treatment technology field. Background technique [0002] As an important renewable energy, the biogas project with anaerobic digestion as the core technology and waste resources as the purpose has become the most effective, One of the most promising means. In the 1970s, my country once promoted the application of biogas, but later, due to unstable operation and low gas production in winter, biogas projects have not been widely promoted in many areas. [0003] In the process of anaerobic digestion of organic matter, methanogens not only need sufficient organic nutrients, but also appropriate amounts of trace elements. The lac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F3/34C02F3/28
CPCY02E50/30
Inventor 李秀芬胡庆昊陈坚堵国成华兆哲
Owner JIANGNAN UNIV
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