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Method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse

A technology of organic waste and anaerobic digestion, which is applied in the direction of waste fuel, biological sludge treatment, solid waste removal, etc., can solve the problems of restricting the use of organic waste anaerobic digestion residues as fertilizers, and cannot completely kill pathogenic bacteria, etc., to achieve Improve the removal rate of pathogenic bacteria, the removal rate of organic matter and the effect of high gas production rate of raw materials and the improvement of removal rate of organic matter

Active Publication Date: 2010-08-04
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with mesophilic anaerobic digestion, high-temperature anaerobic digestion can greatly improve the removal rate of pathogenic bacteria in urban domestic organic waste, but it cannot completely kill pathogenic bacteria, which limits the extensive use of organic waste anaerobic digestion residues as fertilizers

Method used

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  • Method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse
  • Method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The raw material is municipal domestic organic waste collected from the source of city A, and the anaerobic digestion inoculum comes from the anaerobic activated sludge of the biogas digester.

[0027] In the mesophilic anaerobic digestion reactor, the above-mentioned anaerobic activated sludge was acclimated by using the crushed municipal domestic organic waste at a mesophilic temperature (30°C) for 10 days.

[0028] In the high-temperature anaerobic digestion reactor, the above-mentioned anaerobic activated sludge is domesticated by sampling the municipal domestic organic waste after the crushing, first domesticating the anaerobic activated sludge under the condition of medium temperature (30 ℃), and the domestication time is 10 days; then Gradually increase the temperature by 1°C per day to a high temperature (50°C), and acclimatize at a high temperature (50°C) for 5 days, and use it as an inoculum for high-temperature anaerobic digestion after the acclimatization is ...

Embodiment 2

[0040] The raw material is municipal domestic organic waste obtained through mechanical sorting from city B, and the anaerobic digestion inoculum comes from anaerobic activated sludge from municipal sewage treatment plants.

[0041] In the mesophilic anaerobic digestion reactor, the above-mentioned anaerobic activated sludge was domesticated with the crushed urban domestic organic waste at a medium temperature (35° C.) for 12 days. After the domestication was completed, it was used as the inoculum of the mesophilic anaerobic digestion.

[0042] In the high-temperature anaerobic digestion reactor, the above-mentioned anaerobic activated sludge is domesticated by sampling the municipal domestic organic waste after the crushing, first domesticating the anaerobic activated sludge under the condition of medium temperature (35 ℃), and the domestication time is 5 days; then Gradually increase the temperature by 1°C per day to a high temperature (53°C), and acclimatize at a high temper...

Embodiment 3

[0053] The raw material is municipal domestic organic waste obtained through manual sorting from city C, and the anaerobic digestion inoculum comes from the anaerobic activated sludge of the biogas digester.

[0054] In the mesophilic anaerobic digestion reactor, the above-mentioned anaerobic activated sludge was domesticated with the crushed municipal domestic organic waste at a medium temperature (38° C.) for 15 days. After the domestication was completed, it was used as the inoculum of the mesophilic anaerobic digestion.

[0055] In the high-temperature anaerobic digestion reactor, the above-mentioned anaerobic activated sludge was domesticated by the municipal domestic organic waste after the same sampling and crushing, and the anaerobic activated sludge was first domesticated under the condition of medium temperature (38 ° C), and the domestication time was 7 days; then Gradually rise to high temperature (56°C) by increasing the temperature by 1°C per day, and acclimatize ...

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Abstract

The invention discloses a method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse. The method comprises the following steps of: reducing the gain diameter of the municipal domestic organic refuse to below 1 cm; placing the pulverized raw materials into a raw material regulating pool and adding water or digestive liquid into the pool to adjust and control the solid concentration of the raw materials to be below 15 percent; conveying the raw materials with adjusted solid concentration to a heating hydrolyzing pond to preheat the raw materials; pumping the heated raw materials into a medium-temperature anaerobic digestion reactor to perform medium-temperature anaerobic digestion; after the medium-temperature anaerobic digestion is finished, conveying the raw materials to a superhigh temperature intensified hydrolysis reactor; after the intensified hydrolysis, conveying the raw materials to a high-temperature anaerobic digestion reactor; after the high-temperature anaerobic digestion is finished, conveying the raw materials to a sedimentation tank, wherein the temperature of the sedimentation tank is natural temperature; and after the sedimentation, conveying the digestive liquid on the upper part in the tank to a digestive liquid storage pool. The process operation and management are simple; the organic matter removing rate and gas generating rate of the raw materials are high; and pathogenic bacteria in the refuse can be removed completely.

Description

technical field [0001] The invention relates to a method for treating organic waste, more specifically, the invention relates to a method for generating biogas (mainly methane) through enhanced hydrolysis and anaerobic digestion of municipal domestic organic waste. Background technique [0002] With the acceleration of the urbanization process and the improvement of people's living standards, the generation of urban domestic waste is also increasing. In 2007, the national urban domestic waste removal volume was 150 million tons. For a large amount of municipal solid waste, if it is not handled properly, it will cause serious harm to the natural and social environment, such as encroaching on land, polluting water bodies and the atmosphere, endangering agricultural ecosystems, affecting environmental sanitation, spreading diseases, and even causing explosion accidents, etc. Various social problems will occur concurrently, restricting the development of the city. In recent yea...

Claims

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Application Information

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IPC IPC(8): C02F11/04B09B3/00
CPCY02E50/343Y02E50/30
Inventor 孙永明李东袁振宏孔晓英李连华王忠铭庄新姝马隆龙
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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