Technology for methane production through aerobiotic acidification and anaerobic fermentation by means of straw

A production process, aerobic acidification technology, applied in fermentation, waste fuel, etc., can solve problems such as difficulty in exerting optimal efficiency, the addition amount of straw cannot be too high, and the biodegradability of crop straw cannot be improved in a timely manner.

Inactive Publication Date: 2015-04-22
ZHENGZHOU KAISHAN BIOCHEM ENG
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AI Technical Summary

Problems solved by technology

The current biogas fermentation adopts one-stage or two-phase anaerobic fermentation process, which has its corresponding shortcomings.
[0004] The one-stage reaction grows acid-producing bacteria and methanogenic bacteria in the same reactor. Because the growth characteristics of these two types of microorganisms are very different, it is difficult to exert their respective optimal performance
Especially when straw is used as...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] 1) Weigh the rice straw crushed to a length of 20mm, take out 310g of material (240g of air-dried rice straw) after stacking and retting for 30 days, add 2100g of recycled biogas slurry, then replenish water to 4000g (control the solid content to 6%), and control the temperature at 38 ℃, stirring speed 100rpm, ventilation volume 0.2 V / V﹒ min, acid hydrolysis in the acidification tank for 48h. The content of acetic acid in the acidified solution was determined to be 3.90 g / L.

[0013] 2) After the acid hydrolysis, all the materials are pumped into the fermentation tank for fermentation. The fermentation temperature is controlled at 42°C and the stirring rate is controlled at 150rpm. After 30 days of fermentation, the average biogas production of 1kg of air-dried rice straw is 0.4m 3 .

[0014] 3) Discharge 1 / 15 of the material from the fermentation tank every 48 hours for solid-liquid separation, biogas residue is used as organic fertilizer, and biogas slurry is reused...

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PUM

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Abstract

The invention relates to a technology for methane production through aerobiotic acidification and anaerobic fermentation by means of straw. According to the technology, a large amount of agricultural wasted straw is used as the main material, the aerobiotic acidification and anaerobic fermentation two-phase methane production process is conducted, solid-liquid separation is conducted on biogas slurry obtained after fermenting methane, the solid part can directly serve as organic fertilizer without dewatering, and the liquid part is recycled into an aerobiotic acidification tank for acidolysis; no waste water is discharged in the whole process. By adopting the aerobiotic acidification and anaerobic fermentation two-phase fermentation process, placing acid-forming bacteria and methanogens in two reactors respectively and conducting acidification through the aerobic reaction, biogas loss and propionic acid accumulation caused by methanogens during acidification are avoided, the time for anaerobic fermentation of biogas is shortened, and biogas producing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of biomass energy, and in particular relates to a production process for producing biogas by aerobic acidification and anaerobic fermentation of straw. Background technique [0002] China is a large agricultural country and one of the countries with the richest straw resources in the world. In recent years, straw biogas projects have attracted more and more attention. The use of crop straws for anaerobic fermentation to produce biogas is a clean and efficient way to use straw as energy. [0003] The biogas fermentation process is a complex biochemical treatment process, which consists of an acidogenic stage and a methanogenic stage. The current biogas fermentation adopts a one-stage or two-phase anaerobic fermentation process, which has its corresponding shortcomings. [0004] In the one-stage reaction, acid-producing bacteria and methanogenic bacteria are grown in the same reactor. Because the growth cha...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 马晓建张如意杨旭李洪亮王根灿李楠
Owner ZHENGZHOU KAISHAN BIOCHEM ENG
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