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Method for efficiently producing marsh gas by performing moderate-temperature anaerobic dry fermentation on agricultural waste

A technology of agricultural waste and thermo-anaerobic drying is applied in the field of high-efficiency biogas production by mid-temperature anaerobic dry fermentation of agricultural waste, which can solve problems such as excessive acidification, increase gas production rate, improve system buffer performance, and practice energy saving and emission reduction. The effect of meaning and value

Inactive Publication Date: 2015-02-18
CHINA AGRI UNIV
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Problems solved by technology

Anaerobic fermentation alone can easily cause excessive acidification

Method used

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  • Method for efficiently producing marsh gas by performing moderate-temperature anaerobic dry fermentation on agricultural waste
  • Method for efficiently producing marsh gas by performing moderate-temperature anaerobic dry fermentation on agricultural waste
  • Method for efficiently producing marsh gas by performing moderate-temperature anaerobic dry fermentation on agricultural waste

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Embodiment 1

[0050] Example 1. Livestock and poultry manure, crop stalks and vegetable wastes were subjected to combined anaerobic mesothermal batch dry fermentation

[0051] 1. Anaerobic fermentation method: mix livestock and poultry manure, crop stalks and vegetable waste to obtain raw materials; put the raw materials and inoculum in a 1L anaerobic fermentation bottle, and feed nitrogen into the anaerobic fermentation bottle 5min to exhaust the air in the headspace of the reactor to ensure an anaerobic environment for the reaction. Then it was placed in a constant temperature incubator at (35±1)°C for mesophilic anaerobic batch fermentation test, with 7 treatments in total. The conditions of each treatment are shown in Table 1, and the physical and chemical properties of the raw materials are shown in Table 2. In the following 7 groups of experiments, the mass of volatile solids (volatile solid, VS) in the total mixture is 122g / L~124g / L within range.

[0052] Table 1 Conditions of 7 tr...

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Abstract

The invention relates to a method for efficiently producing marsh gas by performing moderate-temperature anaerobic dry fermentation on agricultural waste, which comprises the following steps: uniformly mixing livestock / poultry manure, crop straw and vegetable waste to obtain a mixture, adding an inoculum into the mixture, and carrying out moderate-temperature anaerobic dry fermentation to obtain the marsh gas, wherein the dry matter mass ratio of the sum of the livestock / poultry manure and vegetable waste to the crop straw is (0.3-0.4):1, and the dry matter mass ratio of the livestock / poultry manure to the vegetable waste is (0.1-0.3):(0.1-0.2). The method solves the problems of long fermentation time, low gas production rate, high acidification tendency and the like in the independent anaerobic fermentation of the material, greatly enhances the buffer property of the system, reduces the inhibiting effect due to overhigh concentration of the ammonia nitrogen or other inhibitors, widens the selection range of the fermentation raw materials, increases the treatment power on the organic solid waste, reduces the discharge of the agricultural waste, saves the resources and protects the environment.

Description

technical field [0001] The invention relates to the field of fermentation, in particular to a method for producing biogas with high-efficiency mesothermal anaerobic dry fermentation of agricultural waste. Background technique [0002] my country is a large agricultural country, which produces more than 4 billion tons of agricultural solid waste every year, including more than 3 billion tons of livestock and poultry manure, about 700 million tons of crop straw, and 100 to 150 million tons of vegetable waste. These wastes are not only serious pollution sources but also valuable biomass energy. Nowadays, most of them are randomly incinerated, discarded or directly discharged into the environment, causing environmental pollution and waste of resources. How to effectively deal with agricultural waste has become a major environmental problem that must be faced at home and abroad. [0003] At present, the relatively mature agricultural waste treatment technologies at home and abr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04C05F5/00
CPCY02A40/20Y02E50/30Y02W30/40
Inventor 李国学李扬阳张地方王艳芹
Owner CHINA AGRI UNIV
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