Method for producing methane by using lignocellulosic materials

Abstract

The invention discloses a method for producing methane by using lignocellulosic materials. The method comprises the following steps of: crushing the lignocellulosic materials, adding the crushed lignocellulosic materials into an anaerobic reactor, inoculating an inoculum for carrying out primary fermentation to produce methane; after a methane producing peak, taking digestate out, mechanically dewatering until the water content is 60-75 percent, carrying out biological treatment, inoculating a microbial agent containing one or more of white rot fungi, monilinia fructicola and peurotoid fungi, under the conditions of inoculum size being 1-3 percent, water content being 55-75 percent and temperature being 20-35 DEG C, carrying out aerobic fermentation for 2-7 days; and then inoculating the inoculum for carrying out secondary anaerobic digestion to produce methane. Compared with a technology for producing the methane through pretreatment of the lignocellulosic materials through microorganism inoculating, the method has the advantages that the methane producing rate of the lignocellulosic materials can be increased by 27.64-47.89 percent, the consumption of the microbial agent is reduced by about 50 percent, the loss of readily decomposable organic matters in the lignocellulosic materials in a biotreatment process is greatly reduced, and the accumulated methane production yield of the lignocellulosic materials is increased by 21.77-41-32 percent compared with that in the biological pretreatment.

Description

Technical field: [0001] The invention relates to a biological aftertreatment method for biogas production from lignocellulosic raw materials, and belongs to the fields of rural ecological environment protection and rural renewable clean energy utilization. Background technique: [0002] Today, as fossil energy is gradually exhausted, the impact of energy shortage on the world has become increasingly prominent, and the world has begun to focus on the field of new energy. Among many new energy sources such as solar energy, nuclear energy, water energy, and biomass energy, biomass energy is the safest and most stable energy source, and it is also a new energy field that is currently encouraged by the state. Biomass resources are huge and diverse, including all terrestrial plants, aquatic plants, human and animal excreta, and industrial organic matter. Among all kinds of biomass available for human use, lignocellulosic raw materials account for the vast majority. The anaerobic...

AI Technical Summary

Problems solved by technology

However, in the process of biological pretreatment, microorganisms not only decompose and destroy lignin and crystalline cellulose that are difficult for anaerobic microorganisms to use, but also decompose and utilize cellulose and hemicellulose substances that can be decomposed and utilized by anaerobic microorganisms. , the dry matter loss of lignocellulosic raw materials after pretreatment is serious, thus reducing the cumulative gas production of raw materials

In addition, due to the fluffy structure of lignocellulosic raw materials, the biological pretreatment of raw materials requires a large amount of biological agents, and the demand and workload of pretreatment sites are large, and it is difficult to mix the inocula and lignocellulosic raw materials evenly, which reduces the biological pretreatment. The efficiency of the treatment increases the operating cost of the biogas project, and the above problems affect the engineering application of biological pretreatment

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