With the improvement of people's living standard, the demand for animal products such as eggs, milk and meat is increasing. The main livestock and poultry breeds in China are pigs, cattle, beef cattle, layers and broilers. According to the different organization modes of livestock and poultry farming, it can be divided into three categories: large farms, farming communities and farming professionals. The rapid development of livestock and poultry breeding has brought serious environmental pollution problems. As a way of treating livestock and poultry manure, biogas engineering can effectively solve its pollution problem.
In order to reduce the environmental pollution caused by livestock and poultry manure, it must be treated and discharged. There are two ways to treat livestock and poultry manure. One is to use it as fertilizer and feed. Second, resource reuse, mainly through biogas engineering to solve the environmental pollution caused by livestock and poultry manure. Biogas power generation technology is a new energy comprehensive utilization technology which integrates environmental protection and energy saving. It uses a large number of organic wastes (such as Leeds liquid of distiller, livestock manure, municipal refuse and sewage) from industrial, agricultural and urban life, anaerobic fermentation to produce biogas, generating electricity by biogas generating units and driving, which can make full use of the waste heat of biogas generating units. The clean energy provided by biogas power generation technology not only solves the environmental problems existing in biogas projects, consumes a large amount of waste, protects the environment and reduces greenhouse gas emissions, but also generates a large number of waste heat and electricity, which conforms to the environmental protection concept of energy recycling, and brings huge economic benefits. Benefit.
Biogas engineering is a system engineering which integrates sewage treatment, biogas production and resource utilization. According to the dry matter content of anaerobic fermentation in biogas engineering, biogas engineering fermentation technology can be divided into dry fermentation and wet fermentation. The dry matter content of wet treatment matrix is generally less than 8%, which is a method of treating liquid organic matter. During the pretreatment of livestock and poultry excrement, the solid liquid was completely mixed and then entered the fermentation unit. The dry matter content of dry matrix is generally more than 20%, which is the treatment method of solid organic matter. When this method is used to treat livestock and poultry manure, solid and liquid should be separated, and the separated dry matter should be put into fermentation tank for aerobic treatment. Dry fermentation only needs half the volume of wet fermentation because of its short water holding time, and its cost investment is only half of that of wet fermentation. The production capacity of biogas is four times that of dry fermentation, and the benefit of biogas production is far more than that of dry fermentation.