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Method for producing biogas by combined solid state fermentation of crop straws and excrements of livestocks

A technology of crop straw and solid-state fermentation, applied in fermentation, waste fuel, biological sludge treatment, etc., can solve the problems of not being well developed and utilized, long residence time, large inoculum, etc., and optimize the pretreatment time And structure configuration, the effect of high gas production efficiency

Active Publication Date: 2015-05-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the combined anaerobic digestion process is gradually being used, but the combined solid-state fermentation process using crop straw and livestock and poultry manure as raw materials has not been well developed and utilized.
First of all, the combined fermentation process is restricted by many factors, and the selected raw materials are also limited by the region; secondly, there are still many deficiencies in the solid-state fermentation technology, such as the need for a long residence time, a large amount of inoculum, etc.; There is a more economical pretreatment technology for treating crop straw to improve its gas production capacity; in addition, the high-value utilization of biogas slurry and residue needs to be solved urgently
The above aspects jointly limit the large-scale utilization of crop straw and livestock manure as energy raw materials

Method used

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  • Method for producing biogas by combined solid state fermentation of crop straws and excrements of livestocks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first choice is to put 500g of crop straw with a total solid concentration of 0.95 and a volatile solid concentration of 0.9 after kneading into a 5L container, add 23.75g of NaOH, and then add 268g of water. After mixing evenly, seal and store at 20°C for 1 day. Take it out, add 800g of livestock and poultry manure with a volatile solid concentration of 0.2, and then add 1600g of inoculated sludge with a volatile solid concentration of 0.1, so that the solid content of the entire fermentation system is 25%, mix well and put it into an 8L anaerobic reactor middle. The reactor temperature was controlled at 50°C by a water bath jacket. After 21 days of high-temperature solid-state fermentation, it was taken out, and 30% of the biogas residue was used as an inoculum for the next batch of anaerobic fermentation. The remaining 70% of the biogas residue is passed into the pyrolysis reactor for pyrolysis. During pyrolysis, the pyrolysis temperature is 600°C, the heating ...

Embodiment 2

[0021] The first choice is to put 500g of crop straw with a total solid concentration of 0.95 and a volatile solid concentration of 0.9 after kneading into a 5L container, add 25g of NaOH, and then add 300g of water. After mixing evenly, seal and store at 20°C for 1 day. Take it out, add 750g of livestock and poultry manure with a volatile solid concentration of 0.2, and then add 2000g of inoculated biogas residue with a volatile solid concentration of 0.1, so that the solid content of the entire fermentation system is 22%, mix well and put it into an 8L anaerobic reactor middle. The reactor temperature was controlled at 50°C by a water bath jacket. After 24 days of high-temperature solid-state fermentation, it was taken out, and 30% of the biogas residue was used as an inoculum for the next batch of anaerobic fermentation. The remaining 70% of the biogas residue is passed into the pyrolysis reactor for pyrolysis. During pyrolysis, the pyrolysis temperature is 800°C, the hea...

Embodiment 3

[0023] The first choice is to put 500g of crop straw with a total solid concentration of 0.95 and a volatile solid concentration of 0.9 after kneading into a 5L container, add 16g of NaOH, and then add 255g of water. After mixing evenly, seal and store at 20°C for 3 days. Take it out, add 2000g of livestock and poultry manure with a volatile solid concentration of 0.2, and then add 3000g of inoculated sludge with a volatile solid concentration of 0.1 to make the solid content of the entire fermentation system 25%, mix well and put it into an 8L anaerobic reactor middle. The reactor temperature was controlled at 50°C by a water bath jacket. After 24 days of high-temperature solid-state fermentation, it was taken out, and 30% of the biogas residue was used as an inoculum for the next batch of anaerobic fermentation. The remaining 70% of the biogas residue is passed into the pyrolysis reactor for pyrolysis. During pyrolysis, the pyrolysis temperature is 700°C, the heating rate ...

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Abstract

The invention belongs to the field of efficient resource utilization of organic solid wastes, and particularly relates to a method for producing biogas by combined solid state fermentation of crop straws and excrements of livestocks. The method for producing biogas comprises the following steps of: rubbing the crop straws by a rubber; adding NaOH aqueous liquor, and uniformly mixing for pretreatment; then, performing combined solid fermentation on mixed crop straws, excrements of livestocks and inoculums; performing anaerobic fermentation to produce biogas at 50-60 DEG C; and finally, taking out residue after solid fermentation. 30% of the residue is used for newly added inoculums and the rest enters into a pyrolysis reactor for pyrolysis to product biogas. The pyrolysis gas generated can be used to supply heat to the system, and the solid product after pyrolysis can be used as an active adsorbing material or a catalytic material, so that comprehensive utilization of organic wastes is realized. Compared with the prior art, the method for producing biogas provided by the invention has the characteristics of no biogas slurry, convenience and rapidness, safety, stability and high biogas producing efficiency.

Description

technical field [0001] The invention belongs to the field of high-efficiency resource utilization of organic solid waste, and in particular relates to a method for producing biogas by solid-state fermentation of crop straw and livestock manure. Background technique [0002] The raw material for traditional biogas production is livestock and poultry manure. However, due to the rapid economic development and rising grain prices, many places have encountered problems such as shortage of livestock and poultry manure raw materials. Traditional biogas production often results in unstable gas production due to lack of raw materials, or even no gas production in severe cases. In addition, due to the limitation of the inherent properties of raw materials, when traditional livestock and poultry manure is used as raw material for anaerobic digestion, the biogas production is usually relatively low, about 350L / kg VS. [0003] my country is a large agricultural country, which produces a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/30
Inventor 刘广青李叶青张瑞红何艳峰陈畅冯璐肖潇马欣欣
Owner BEIJING UNIV OF CHEM TECH
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