Construction Plan for Black Film of Biogas Tank in Taizhou Livestock Farm, Zhejiang Province, in accordance with the American Standard for Urban Construction

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　　1. High anti-seepage coefficient: The anti-seepage film installed in the pool has an anti-seepage effect that ordinary waterproof materials cannot match, does not pollute groundwater, has high-strength tensile mechanical properties, excellent elasticity and deformation ability, making it very suitable for expansion and contraction base surfaces, and can effectively overcome uneven settlement of the base surface.

　　2. Storage convenience: Feces can be stored at any time, and the storage period can be determined according to the requirements of fertilization cycle and manure maturation period. Feces can be accessed and used in various ways.

　　3. Aging resistance: the anti-seepage membrane has anti-aging, anti ultraviolet and anti decomposition capabilities, and can be used outdoors. The service life of the material can reach 30 years.

　　4. Plant resistance: The anti-seepage membrane has excellent puncture resistance, which can resist most of the plant roots, avoid damage to the anti-seepage membrane, and ensure the service life and functional performance of the anti-seepage membrane.

　　5. Environmentally friendly and non-toxic: The anti-seepage membrane adopts non-toxic and environmentally friendly materials, and the anti-seepage principle is a physical and chemical process. The entire process does not produce toxic substances and does not affect land reuse.

　　6. The "low cost, high efficiency" black film biogas digester process adopts a new type of anti-seepage membrane technology, making the entire storage process more scientific, concise, and significantly lower in cost and engineering expenses than traditional waterproof materials. After actual calculations, it has been found that using this storage process can save about 50% of costs compared to traditional storage processes.

　　7. Fast construction speed: on-site excavation and film covering can be carried out, with a short installation and construction period. Single pool film covering can be completed in 3-5 days. Adopting hot melt welding, the weld strength is high, the construction is convenient, fast and safe.

　　8. Diversity of choices: unrestricted use in all regions of the country, unrestricted storage areas within the venue, and unrestricted seasons; There are three modes to choose from, and domestic customer service can choose according to the actual needs of the pig farm.

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　　The development of biogas digesters closely related to the aquaculture industry has gone through a process from underground brick and concrete structure biogas digesters to reinforced concrete biogas digesters and enamel assembled tank biogas digesters. However, the high cost of traditional biogas digesters has deterred many farmers. Gradually developing to red mud biogas digesters, the cost of red film biogas digesters has been reduced compared to previous ones, but the performance is unsatisfactory, especially in terms of not being able to discharge slag. With the continuous introduction of technology, black film soft biogas digesters have quietly emerged. Black film biogas digesters, commonly known as covered lagoons, film covered biogas digesters, and geomembrane biogas digesters. Its biogas production principle is the same as that of the traditional biogas digester. It uses the advantages of HDPE membrane material in seepage prevention and leakage prevention to lay a layer of HDPE anti-seepage membrane in the excavated pit. According to the requirements of anaerobic fermentation process, the inlet and outlet, slag extraction pipe and biogas collection pipe are installed in the tank. The upper mouth of the pit is sealed with HDPE anti-seepage membrane, and the surrounding anchor ditches are fixed to form an overall anaerobic fermentation space. Through practical results, it has been proven that black film soft biogas digesters are more suitable for the pollution control needs of aquaculture farms. The principle is to use black film to absorb heat and improve fermentation efficiency. The construction cost of the tank is one tenth of that of a steel-concrete structure biogas tank and one-fifth of that of a red film biogas tank. Whether in terms of price, gas production, or usage effectiveness, biogas digesters from other processes are far ahead. Nowadays, black film soft biogas digesters have been widely popularized in Guangdong and Guangxi regions. The Guangdong Provincial Environmental Protection Department has recommended this process to breeding enterprises in Guangdong. As of the end of 2016, it is conservatively estimated that black film soft biogas digesters have already occupied one-third of the market in Guangdong region. This process gradually spread to Hunan, Jiangxi, Anhui, Hubei, Hebei and other places. Can this type of black film soft biogas digester be built in northern regions? Actual cases and usage effects have proven to be completely suitable. At present, it has been operating stably for several years, producing stable biogas throughout the year. All biogas is used for power generation, which not only meets the needs of enterprise pollution control, but also has significant benefits for biogas power generation. Truly solved the bottleneck problem of traditional biogas digesters with only input and no output. Environmental protection of black film biogas digester: The anti-seepage membrane adopts environmentally friendly materials, and the anti-seepage principle is physical, which does not produce toxic substances and does not affect land reuse.

　　The construction cost of black film biogas digesters is low and the construction is convenient; Long residence time and good water output effect; PE film heat absorption performance number, high gas production; Ultra large gas storage capacity, achieving integrated gas storage; It can effectively achieve the function of slag discharge. The suitable temperature for reproduction is 15-20 ℃, and the suitable relative humidity of the air is 70%~95%. When the temperature is below 3 ℃ and the relative humidity of the air is below 60%, fertility is interrupted. Garlic stored in the field may also be damaged by adult mites and nymphs. It often invades from the cracks at the edge of the garlic stem, sucking juice from the fleshy part at the base of the garlic clove, and gradually transferring to the garlic clove to cause damage, causing the clove to gradually wilt, turn brown, and wither, and the garlic clove to become an empty shell.

　　Black film biogas digester, scientific name "fully enclosed anaerobic pond", is an important part of the biogas production equipment in aquaculture farms. The capacity of this biogas digester is 15000 cubic meters, with a black film on the ground and a top height of four to five meters. The anaerobic pond has a total depth of over 10 meters and a water depth of seven to eight meters. All the floating on the water is biogas. The black film with a thickness of only 1.5 millimeters is like a pot lid, covering the biogas inside and preventing it from leaking out. Biogas can be converted into electrical energy for production and daily use such as lighting, cooking, and pig house insulation in breeding farms.

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• American Standard for Urban Construction