Method for producing methane through combination of perishable organic wastes and straws

A technology for producing biogas from organic waste, applied in waste fuel, fermentation, etc., can solve problems such as difficulty in finding sanitary landfill sites, low energy output efficiency, and high one-time investment, so as to avoid corrosion of equipment and pipelines, reduce Cost of pretreatment, effect of optimizing carbon-nitrogen ratio

Active Publication Date: 2012-10-31
深圳市海吉星环保有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above characteristics lead to some problems in the existing municipal solid waste treatment technologies; for example, the high organic matter content will lead to a large amount of leachate polluting groundwater and pedosphere and disorderly emissions of greenhouse gases (mainly methane) during the landfill process. ); the higher moisture content results in the addition of a large amount of additional auxiliary fuel to the incineration process
Sanitary landfill has high requirements for site selection and covers a large area. In many large cities, it has been difficult to find suitable sites for sanitary landfill; incineration treatment, due to secondary pollution, high one-time investment, and energy output efficiency Low-level issues, the government and the public are cautious about

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  • Method for producing methane through combination of perishable organic wastes and straws

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Experimental program
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Effect test

Embodiment 1

[0029]Use fresh fruit and vegetable waste (moisture content 89%) as perishable organic waste, collect and remove impurities, and crush it to a particle size below 20mm for later use; use dry straw (moisture content 9%) as straw, and crush it to a particle size below 20mm for later use; Pack 50kg of crushed fruit and vegetable waste on the diafiltration packing of the solid percolation bed, add biogas fermentation inoculum, seal the solid percolation bed, control the pH value to 4.5 for anaerobic hydrolysis to produce acid, and take 1.5 kg from the solid-liquid every 4 hours The separated biogas slurry enters from the top of the solid percolation bed and rinses the fruit and vegetable waste through the water distributor, and the volatile fatty acids (formic acid, acetic acid, propionic acid, butyric acid, valeric acid, lactic acid, etc.) produced by hydrolysis are dissolved In biogas slurry, leachate is formed after passing through the diafiltration packing and the porous plate ...

Embodiment 2

[0031] Use fresh fruit and vegetable waste (moisture content 89%) as perishable organic waste, collect and remove impurities, and crush it to a particle size below 20mm for later use; use dry straw (moisture content 9%) as straw, crush it to a particle size below 20mm for later use; Load 100kg of crushed fruit and vegetable waste on the diafiltration packing of the solid percolation bed, add biogas fermentation inoculum, seal the solid percolation bed, control the pH value to 5 for anaerobic hydrolysis to produce acid, and take 3 kg every 3 hours for solid-liquid separation The final biogas slurry enters from the top of the solid percolation bed and rinses the fruit and vegetable waste through the water distributor. The volatile fatty acids (formic acid, acetic acid, propionic acid, butyric acid, valeric acid, lactic acid, etc.) produced by hydrolysis are dissolved in In the biogas slurry, leachate is formed after passing through the diafiltration packing and the porous plate s...

Embodiment 3

[0033] Use fresh kitchen waste (moisture content 76%) as perishable organic waste, collect and remove impurities, and crush it to a particle size below 20mm for later use; use dry straw (moisture content 9%) as straw, and crush it to a particle size below 20mm for later use; Take 100kg of crushed kitchen waste and put it on the diafiltration packing of the solid percolation bed, add biogas fermentation inoculum, seal the solid percolation bed, control the pH value of 6.5 for anaerobic hydrolysis to produce acid, take 4kg from the solid percolation bed every 3 hours The biogas slurry after liquid separation enters from the top of the reactor and washes the kitchen waste through the water distributor, and the volatile fatty acids (formic acid, acetic acid, propionic acid, butyric acid, valeric acid, lactic acid, etc.) produced by hydrolysis are dissolved In water, under the action of gravity, it passes through the diafiltration packing and the porous plate supporting the diafiltr...

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Abstract

The invention discloses a method for producing methane through combination of perishable organic wastes and straws. The method comprises the following steps: step 1, collecting the perishable organic wastes and the straws, and respectively crushing; step 2, filling the crushed perishable organic wastes on percolation fillings of a solid percolation bed, adding fermenting methane inoculants, and carrying out anaerobic hydrolysis to produce acid so as to form percolate; step 3, collecting the percolate discharged from the bottom of the solid percolation bed, adding the percolate and the crushed straws into a straw pretreatment reactor, heating, soaking and pre-treating; and step 4, collecting a mixture of hydrolysis acid production residues, and pre-treated straws and percolate, adding the mixture into a methane fermentation reactor, and carrying out hybrid anaerobic fermentation to produce the methane. According to the invention, acid poisoning of the perishable organic wastes, which is easy to happen in the conventional anaerobic fermentation process, and abrasion of equipments and pipelines in the conventional strong acid/strong alkali pretreatment can be avoided, the pretreatment cost of the straws is reduced, the method is beneficial for subsequent utilization of methane residues, and the fermentation performance of the methane is improved.

Description

[technical field] [0001] The invention relates to the field of renewable energy, in particular to a method for jointly producing biogas from perishable organic waste and straw. [Background technique] [0002] China is a large agricultural country, producing about 800 million tons of crop straw every year. At present, the energy utilization methods of straw mainly include incineration, gasification, pyrolysis, ethanol fermentation and biogas fermentation. Compared with other energy utilization methods, using biogas fermentation technology to process and utilize straw can not only produce efficient, clean and high-grade energy, but also produce biogas residue and biogas slurry can be directly used as organic fertilizer. Biogas fermentation technology itself is a very mature technology. Using this technology to convert straw into new energy can alleviate the shortage of conventional energy in my country and improve the quality of life of rural people; on the other hand, it can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 黎振廷曹婧颜煦
Owner 深圳市海吉星环保有限责任公司
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