Method for preparing biogas through two-phase fermentation of crop stalks

A bio-natural gas and straw technology, applied in fermentation, waste fuel, etc., can solve the problems of poor gas quality and low bio-conversion rate of straw, and achieve the effects of reducing energy consumption, shortening processing time, and avoiding waste of raw materials

Inactive Publication Date: 2015-10-21
BEIJING HELEE BIO ENERGY
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AI Technical Summary

Problems solved by technology

In actual operation, the separation effect of the acid-producing phase and the methanogenic phase in the straw two-phase anaerobic fermentation system is often different. The acid-producing phase produces more gas, while the gas-producing phase produces less gas (methane), resulting in a low bioconversion rate of straw. , poor gas quality and other issues

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  • Method for preparing biogas through two-phase fermentation of crop stalks
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  • Method for preparing biogas through two-phase fermentation of crop stalks

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specific Embodiment approach

[0035] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] Following examples 1-11 and comparative example 1 volatile fatty acid (VFAs) content determination method are as follows: volatile fatty acid determination adopts gas chromatography to measure, use Stabil-Wax-DA30m*0.53mm*0.25m type capillary column, FID detects 4-methylpentanoic acid was used as internal standard with temperature programming. The quantitative analysis of the sample is determined by the size of the peak area, and the qualitative analysis of the sample is determined by the retention time. For specific methods, please refer to "Study on Optimization of Technical Parameters for Hydrolysis of Bundled Wheat Straw to Produce Acid" (Lv Lili, 2013).

[0037] The calculation method of the acidification rate of the following examples 1-11 and comparative example 1 unit dry matter straw is as follows: first measure the co...

Embodiment 1

[0043] A high-efficiency acidifying bacterial solution, the preparation method of which is as follows: take the biogas slurry from a chicken manure biogas project in Yanqing, separate the solid phase and liquid phase with a vibrating sieve, concentrate the solid phase, adjust the pH to 5.5 with hydrochloric acid, and place it for 3 days , the solid phase must be treated; the composite additive (including 100 parts by weight of CaO, 5 parts by weight of cellulase), sorghum straw and the above-mentioned liquid phase are mixed according to the weight ratio of 1:12:120, and the straw saccharification solution is obtained after standing for 5 days; The above-mentioned treated solid phase was added to the straw saccharification liquid, and the initial pH value was adjusted to 7.5 to carry out the fermentation reaction, and the content of volatile fatty acids (VFAs) in the fermentation liquid was measured until the content of volatile fatty acids (VFAs) in the fermentation liquid did n...

Embodiment 2

[0045] A high-efficiency acidifying bacterial solution, the preparation method of which is as follows: take the biogas slurry from a straw biogas project in Yanqing, separate the solid phase and liquid phase with a vibrating sieve, concentrate the solid phase, adjust the pH to 4 with hydrochloric acid, and place it for 1 day. The solid phase was treated; the composite additive (containing 50 parts by weight of CaO and 1 part by weight of cellulase), corn stalks and the above-mentioned liquid phase were mixed according to the weight ratio of 1:10:100, and the stalk saccharification liquid was obtained after being placed for 2 days; The above-mentioned treated solid phase is added to the above-mentioned straw saccharification liquid, and the initial pH value is adjusted to 6.5 to carry out the fermentation reaction, and the content of volatile fatty acids (VFAs) in the fermentation liquid is measured until the value of the content of volatile fatty acids (VFAs) does not increase f...

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Abstract

The invention relates to a method for preparing biogas through two-phase fermentation of crop stalks. The method comprises the steps that an acidogenic phase and an aerogenesis phase are separately carried out at two places; the acidogenic phase carries out acid treatment on the crop stalks to obtain acidizing fluid, and the acidizing fluid is transported to the aerogenesis phase so as to carry out biogas production; biogas slurry generated by the aerogenesis phase is used for preparing an efficient acidification bacterium solution; the efficient acidification bacterium solution is used for obtaining acidizing fluid when the acidogenic phase carries out acid treatment on the crop stalks; and the steps are circularly executed. The phenomenon of aerogenesis of the acidogenic phase is thoroughly restrained, and the yield and the concentration of the organic acid are greatly improved; and the phenomenon that due to an aerogenesis reaction is made in the acidogenic phase in a traditional two-phase technology, raw materials are wasted is avoided, and therefore the gas production rate and the gas production quality (methane concentration) of the aerogenesis phase are obviously improved. By means of the method, the collection, transportation and storage cost of the crop stalks is better reduced, the treatment range of the crop stalks is expanded, and an effective industrialized solution template is provided for resource utilization of the crop stalks in rural areas.

Description

technical field [0001] The invention relates to the technical field of straw biogas, in particular to a method for preparing biological natural gas by two-phase fermentation of straw. Background technique [0002] my country has very rich straw resources. In recent years, the use of straw for biogas production has become an important technical approach for straw resource utilization and energy utilization. The traditional straw single-phase anaerobic fermentation technology has problems such as low straw degradation rate, difficulty in feeding and discharging materials, and easy formation of scum layer on the surface. The straw two-phase anaerobic digestion process has the advantages that the single-phase process does not have. It can separate and optimize the hydrolytic acidification and methanation respectively, avoiding the acid accumulation caused by the limitation of the methane production rate in the early stage and the limitation of the hydrolysis rate in the later st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 陈曦光钟凯民潘文智刘旭明马连国胡宝富王亚男
Owner BEIJING HELEE BIO ENERGY
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