The construction of small pig manure digester in pig farms is an important environmental protection project, which can not only solve the problem of pig manure treatment, but also provide clean energy for pig farms. This paper will introduce the construction method of small pig manure biogas digester in pig farms, including the site selection, design, construction and operation management of biogas digester.
First, the site selection of the biogas digester.
When choosing a site for a digester, the following factors need to be considered:
1.The size of the pig farm and the production of pig manure ensure that the digester is able to digest enough pig manure.
2.Topography and topography, choose a flat, open site with a certain height, which is conducive to the feeding and discharging of the digester.
3.The transportation is convenient, which is convenient for the transportation and later maintenance of biogas digester construction materials.
4.Keep away from residential areas and drinking water sources to avoid polluting the surrounding environment.
Second, the design of the biogas digester.
When designing a digester, the following factors need to be considered:
1.Determine the volume and shape of the digester, and determine the appropriate volume according to the size of the pig farm and the production of pig manure, generally 50 cubic meters to 100 cubic meters. The shape is mainly cylindrical or rectangular, which is conducive to the mixing and flow of fermentation raw materials.
2.The depth of the digester is determined according to the local water table and hydrogeological conditions, generally between 2 and 4 meters.
3.Design the position and size of the inlet and outlet, the inlet should be located at the bottom of the digester, and the outlet should be located at the upper part of the digester. At the same time, the size of the inlet and outlet should be appropriate to facilitate the infeed and discharging operations.
4.Design the air duct of the biogas digester and the stirring device of the fermentation raw materials, and the air guide pipe should be located on the top of the digester to collect the biogas produced. The stirring device of fermentation raw materials should be designed according to the actual situation, so that the fermented raw materials can be fully mixed and fermented.
3. Construction of biogas digester.
When building a biogas digester, the following issues need to be paid attention to:
1.Strictly abide by construction specifications and safety requirements to ensure construction quality and safety.
2.Choose the right building materials, such as cement, sand, etc., to ensure the durability and tightness of the digester.
3.Carry out construction according to the design drawings to ensure that the structure and size of the digester meet the requirements.
4.Pay attention to the construction environment and avoid debris and sewage from entering the biogas digester.
5.During the construction process, the structure and tightness of the digester should be checked regularly, and problems should be dealt with in time.
Fourth, the operation and management of the biogas digester.
In the process of biogas digester operation, the following management needs to be done:
1.Regularly check the operation status of the biogas digester, including feeding, discharging, gas production, etc.
2.Clean the digester regularly and keep the inside of the digester hygienic and clean.
3.Carry out regular service and maintenance of the digester, including checking the tightness, repairing damaged parts, etc.
4.Do a good job of recording the operation of the biogas digester, including data such as feed volume, discharge volume, gas production volume, etc., so as to analyze and optimize the operation status of the biogas digester.
5.Strengthen safety management to ensure that safety measures are implemented during the operation of the biogas digester.
6.Improving the utilization rate and gas production efficiency of pig manure can be achieved by optimizing the feed ratio and adjusting the fermentation temperature. At the same time, other forms of energy can be explored, such as converting biogas slurry into organic fertilizer or biogas.
7.Strengthen environmental awareness, ensure that the waste of the biogas digester is properly treated and utilized, and avoid secondary pollution to the environment. At the same time, it is also necessary to strengthen publicity and education efforts to improve the environmental awareness and participation of farmers.
8.* Policies and measures can be introduced to encourage and support pig farms to build biogas digesters. For example, preferential policies such as financial subsidies and tax exemptions can be provided; Projects such as biogas power plants can be built to absorb and digest waste from pig farms; Advanced breeding technology and equipment can be promoted to improve the production efficiency and environmental protection level of pig farms.