阅读说明：本技术 一种沼气的制备方法 (Preparation method of biogas ) 是由 杨旭忠 黄渊淼 韩红利 王燕英 巴战生 安青 于 2019-12-03 设计创作，主要内容包括：本发明公开了一种沼气的制备方法,涉及沼气制备技术领域,用于解决纯秸秆制备沼气,产气率低,经济可行性低的问题,该沼气制备方法依次经过秸秆青贮、调浆混合、厌氧发酵和沼液回收步骤,加入秸秆、猪粪、白腐真菌和活性污泥来制备沼气,适用于通过秸秆制备沼气,具有产气率高,产气快的优点。(The invention discloses a preparation method of biogas, relates to the technical field of biogas preparation, and is used for solving the problems of low gas production rate and low economic feasibility in the preparation of biogas from pure straws.)

1. The preparation method of the biogas is characterized by comprising the following steps

(1) Ensiling the straws: crushing the straw raw material into straw powder with the granularity of less than 3cm by a crusher, adding the straw powder into an ensiling tank, adding white rot fungi into the ensiling tank, and ensiling for 4-6 days;

(2) mixing slurry and mixing: adding the ensiled straws into a size mixing tank, adding 10-20% of pig manure by weight of the straws, 30-50% of activated sludge by weight of the straws and 200-400% of water by weight of the straws into the size mixing tank, and mixing and stirring to obtain a mixed solution of the straws and the pig manure;

(3) anaerobic fermentation: adding the mixed liquid after size mixing into a fermentation tank, fermenting for 1-3 days to generate biogas, biogas residues and biogas liquid, conveying the biogas to a stove through a pipeline for a user to use, and putting the biogas residues and the biogas liquid into a liquid storage tank;

(4) biogas slurry recovery: the biogas residues in the liquid storage tank are used as organic fertilizers, and the biogas slurry is added into the fermentation tank.

2. The method for preparing biogas according to claim 1, wherein the straw raw material is one or more of wheat straw, corn straw and rice straw.

3. The method for producing biogas according to claim 1 or 2, wherein the activated sludge is biogas sludge or river bottom sludge.

Technical Field

The invention relates to the technical field of biogas preparation, in particular to a biogas preparation method, which is used for preparing biogas.

Background

China is a big agricultural country, crop straws generated every year are more than 7 hundred million tons, with the development of rural economy and the continuous improvement of the living standard of farmers, the consumption of the crop straws used as cooking fuel in rural areas is gradually reduced, at present, two treatment modes of the crop straws are mainly incineration and composting, the former generates a large amount of dust and harmful gas to cause air pollution, and the latter needs to consume a large amount of manpower and material resources and is uneconomical and unpractical.

At present, China is actively promoting the construction of large-scale biogas projects to build the biomass natural gas industry of China, and the straws are used as a raw material with wide sources, so that the problem of insufficient biogas raw materials in rural areas can be solved, and the problem of atmospheric pollution caused by straw burning can be effectively avoided.

However, the problem of insufficient gas production exists when the straw is simply used for preparing the biogas, and the economic feasibility is low.

Disclosure of Invention

The invention aims to: in order to solve the problem of insufficient biogas production rate in the preparation of pure straws, the invention provides a biogas preparation method, wherein straws are used as a main raw material, pig manure is used as an auxiliary material to prepare biogas, and the biogas production rate is improved while the straw raw material is fully utilized.

The invention specifically adopts the following technical scheme for realizing the purpose: .

The preparation method of the biogas comprises the following steps

(1) Ensiling the straws: crushing the straw raw material into straw powder with the granularity of less than 3cm by a crusher, adding the straw powder into an ensiling tank, adding white rot fungi into the ensiling tank, and ensiling for 4-6 days;

(2) mixing slurry and mixing: adding the ensiled straws into a size mixing tank, adding 10-20% of pig manure by weight of the straws, 30-50% of activated sludge by weight of the straws and 200-400% of water by weight of the straws into the size mixing tank, and mixing and stirring to obtain a mixed solution of the straws and the pig manure;

(3) anaerobic fermentation: adding the mixed liquid after size mixing into a fermentation tank, fermenting for 1-3 days to generate biogas, biogas residues and biogas liquid, conveying the biogas to a stove through a pipeline for a user to use, and putting the biogas residues and the biogas liquid into a liquid storage tank;

(4) biogas slurry recovery: the biogas residues in the liquid storage tank are used as organic fertilizers, and the biogas slurry is added into the fermentation tank.

Furthermore, the straw raw material is one or more of wheat straw, corn straw and rice straw.

Further, the activated sludge is methane sludge or river bottom sludge.

The invention has the following beneficial effects:

(1) white rot fungi are added into the ensiling pool, and can secrete extracellular oxidase to degrade lignin and cellulose of the straws, so that the straw decomposition speed is increased, the straw degradation amount is increased, and the biogas production efficiency is improved;

(2) the straw is degraded by the microorganisms contained in the pig manure and the activated sludge, so that the degradation speed of the straw is further accelerated, and the gas production efficiency of the straw is improved.

Detailed Description

In order that those skilled in the art will better understand the present invention, the following examples are provided to illustrate the present invention in further detail.