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System and method for producing biogas from perishable waste by two-phase pressurized anaerobic fermentation

An anaerobic fermentation and waste technology, applied in fermentation, waste fuel, gas production bioreactor, etc., can solve the problems of low reaction load, low methane content, and inability to achieve continuous use of materials

Active Publication Date: 2016-05-11
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are all batch feeding, which cannot realize continuous use of materials, and the reaction load is still low, and the methane content in the generated biogas is low (the volume fraction of methane is generally not more than 65%), and additional equipment is still required for processing. To improve biogas quality

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  • System and method for producing biogas from perishable waste by two-phase pressurized anaerobic fermentation

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Experimental program
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Effect test

Embodiment 1

[0063] This embodiment provides a two-phase pressurized anaerobic fermentation system for producing biogas from perishable wastes, the flow chart of which is as follows figure 1 As shown, the system includes: acidification reactor, acidification gas storage tank, acidification buffer tank, three methanation reactors, methanation buffer tank;

[0064] The acidification reactor is equipped with an inlet, a gas outlet, a liquid outlet and a solid outlet;

[0065] The methanation reactor is provided with a gas inlet, a liquid inlet, a gas outlet and a liquid outlet;

[0066] The inlet of the acidification gas storage tank is connected with the gas outlet of the acidification reactor through pipelines; the outlet of the acidification gas storage tank is respectively connected with the gas inlets of the three methanation reactors;

[0067] The inlet of the acidification buffer tank is connected with the liquid outlet of the acidification reactor through a pipeline; , the second me...

Embodiment 2

[0073] This embodiment provides a method for two-phase pressurized anaerobic fermentation to treat perishable wastes to produce biogas, which is realized by using the system in Embodiment 1, and the method includes the following steps:

[0074] Put the perishable wastes obtained after sorting and crushing into the acidification reactor, the reactor type is complete mixed type (CSTR), add the fermentation liquid of the running biogas plant as the inoculum, and carry out the acidification reaction to obtain acidification gas and acidification liquid; after the long-term operation of the reaction, large particle residues will be accumulated, which can be discharged through the solid outlet of the acidification reactor; the residues will be reused after solid-liquid separation.

[0075] The organic loading rate of the above acidification reaction is 10kgVS / m 3 / d, the hydraulic retention time is 4 days, the pH value is 4-6, and the reaction temperature is 37°C;

[0076] Add the i...

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Abstract

The invention provides a system and a method for bi-phase pressure anaerobic fermentation processing perishable waste for preparing marsh gas. The method comprises the following steps: performing the acidizing reaction on the perishable waste in an acidification reactor to obtain an acidic gas and an acidic liquid, and triggering the acidizing reaction at the reaction beginning stage; performing the methanation reaction on the acidic liquid and the acidic gas in the methanation reactor to obtain marsh gas and methane digestive juice, and triggering the methanation reaction at the reaction beginning stage; mixing the marsh gas with the methane digestive juice according to the mass ratio of (14:1)-(2:1) after that the methanation reaction is stable, adjusting the pH value, performing the methanation reaction on the acidic gas and the mixed liquid in the methanation reactor to obtain marsh gas and methane digestive juice. The marsh gas with high yield and high purity can be achieved while the additional preprocessing method is not needed by the method, and the gas cleaning and purifying system is not needed. The system is strong in stability, strong in anti-shock loading capability, high in gas yield, short in reaction period and high in methane content of the marsh gas.

Description

technical field [0001] The invention relates to a system and method for two-phase pressurized anaerobic fermentation to process perishable waste to produce biogas, belonging to the field of organic waste treatment and energy conversion. Background technique [0002] Perishable waste mainly refers to the perishable and biodegradable waste generated in people's life and production process, including kitchen waste, food waste, vegetable and fruit waste, meat processing waste, etc. With the improvement of people's living standards and the acceleration of urbanization, the output of perishable waste is gradually increasing. Taking kitchen waste as an example, at present, the annual output of kitchen waste in my country is about 100 million tons. Due to the high moisture content of perishable waste (generally higher than 70%), high organic matter content (calculated on a dry basis, its organic content is generally higher than 90%), easy to stink, easy to breed bacteria, etc. Trad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C12M1/107
CPCY02E50/30
Inventor 李叶青周红军江皓浦鹏张松林
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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