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Method for preparing biogas from kitchen garbage

A kitchen waste and biogas technology, applied in waste fuel, fermentation, etc., can solve the problems of long start-up time, low biogas yield, and low methane content of biogas, so as to improve the gas production rate and efficiency, and improve the hydrolysis efficiency Effect

Inactive Publication Date: 2017-07-14
盱眙凹土能源环保材料研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solid or semi-solid anaerobic digestion mode has disadvantages such as long start-up time, low mass and heat transfer efficiency, low biogas yield, low biogas methane content, large production scale, easy acidification in the fermentation process, and failure of biogas fermentation. , which limits the technical promotion of biogas fermentation of kitchen waste, so it is urgent to develop a new mode of biogas fermentation of kitchen waste to overcome the above shortcomings, so that the technology of biogas fermentation of kitchen waste can be applied on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Prepare biogas according to the following steps

[0020] (1) Household kitchen waste is hydrolyzed by dilute acid with a mass fraction of 0.01% dilute sulfuric acid, the mass ratio of solid to liquid is 15%, the reaction temperature is 220°C, and the reaction time is 15 min. After hydrolysis, filter to obtain the initial kitchen waste dilute acid hydrolyzate;

[0021] (2) Adjust the pH of the above-mentioned hydrolyzate to 10.5 with lime, and filter to obtain the clear liquid of kitchen waste dilute acid hydrolyzate;

[0022] (3) Dilute the obtained kitchen waste dilute acid hydrolyzate with water to an initial COD of 25,000 mg / L, then add urea and potassium dihydrogen phosphate to obtain fermentation raw materials. The mass ratio of C / N in the fermentation raw materials is 400:5, C / P mass ratio is 50:1;

[0023] (4) Put the anaerobic granular sludge into the anaerobic fermentation tank, the amount of sludge is 70% of the reactor volume, and use the pum...

Embodiment 2

[0024] Embodiment 2: Prepare biogas according to the following steps

[0025] (1) The kitchen waste from restaurants is hydrolyzed with dilute hydrochloric acid with a mass fraction of 5%, the solid-to-liquid mass ratio is 1.5%, the reaction temperature is 80°C, and the reaction time is 220 minutes. acid hydrolyzate;

[0026] (2) Adjust the pH of the hydrolyzed solution to 6.0 with calcium carbonate, and filter to obtain the dilute acid hydrolyzed solution of kitchen waste;

[0027] (3) Dilute the obtained kitchen waste dilute acid hydrolyzate with water to an initial COD of 1000 mg / L, add yeast extract and ammonium dihydrogen phosphate to obtain fermentation raw materials, the mass ratio of C / N in the fermentation raw materials is 50:5, C / P mass ratio is 200:1;

[0028] (4) Put the anaerobic granular sludge into the upflow anaerobic sludge bed reactor, and the amount of mud loaded is 5% of the reactor volume; use the pump to pump the fermentation raw materials containing n...

Embodiment 3

[0029] Embodiment 3: Prepare biogas according to the following steps

[0030] (1) The kitchen waste in the canteen of the unit is hydrolyzed with dilute acid with a mass fraction of 3% formic acid, the solid-to-liquid mass ratio is 10%, the reaction temperature is 170°C, and the reaction time is 150 minutes. After hydrolysis, filter to obtain the initial kitchen waste hydrolyzate ;

[0031] (2) Adjust the pH of the hydrolyzate to 8.5 with sodium hydroxide, and filter to obtain the clear liquid of the kitchen waste hydrolyzate;

[0032] (3) Dilute the obtained kitchen waste hydrolyzate with water to an initial COD of 15,000 mg / L, and then add peptone and potassium hydrogen phosphate to obtain fermentation raw materials. The mass ratio of C / N in the fermentation raw materials is 200:5, and the mass ratio of C / P is The ratio is 50:1;

[0033] (4) Put the anaerobic granular sludge into the anaerobic granular sludge expanded bed reactor, and the amount of sludge loaded is 60% of ...

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PUM

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Abstract

The invention discloses a method for preparing biogas from kitchen garbage. Firstly, diluted acid is adopted to hydrolyze kitchen garbage, so that hydrolysate which contains water-soluble organic matter is obtained; pH is then regulated, and after filtration, clear hydrolysate is obtained; secondly, water is added for dilution, and nitrogen source and phosphorus source nutrient substances are added, so that a fermenting material is obtained; finally, an anaerobic fermentation strain is added into anaerobic reactor, the fermenting material is injected for continuous anaerobic digestion, and biogas is discharged out from the top of the fermentation reactor. Since the method adopts diluted acid to hydrolyze kitchen garbage, the rate of biogas production and the efficiency of biogas production are increased; and because a feeding method for fermentation is liquid feeding, the defects of traditional kitchen garbage biogas fermentation, long starting time, low mass transfer and heat transfer efficiency, low biogas yield, low methane content in biogas, limited production scale and biogas fermentation failure caused by easy acidification in the process of fermentation, are overcome.

Description

technical field [0001] The invention relates to a method for producing biogas, in particular to a method for preparing biogas from kitchen waste. Background technique [0002] Biogas, also known as biogas, is a bioenergy gas with methane and carbon dioxide as the main components produced by microbial groups that digest degradable organic wastes under anaerobic conditions. It is widely used in cities and villages. Kitchen waste is a kind of organic waste, which refers to the waste generated in the daily life of residents and activities such as food processing, catering services, and unit meals. Its main sources are home kitchens, restaurants, restaurants, canteens, markets and other food related Processing-related industries can be used as raw materials for biogas fermentation. [0003] At present, most domestic and foreign kitchen waste biogas fermentation technologies use solid / semi-solid feed materials, that is, solid and semi-solid kitchen waste is placed in a fermenter ...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 陈新德黄超熊莲郭海军王璨张海荣罗沐榃陈雪芳黎海龙彭芬
Owner 盱眙凹土能源环保材料研发中心
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