Application Characteristics of Geomembrane-covered Biogas Digester
The picture above looks like a black flying saucer from afar; it looks like a huge yurt from a close view. What is this?
This is the membrane-covered biogas tank, whose scientific name is “fully enclosed anaerobic pond”, and is an important part of the biogas production device of the farm. The biogas digester has a volume of 15,000 cubic meters, and the imported low cost textured geomembrane on the ground has a height of 45 meters, the total depth of the anaerobic pond is more than 10 meters, and the water depth is 78 meters. All the “floating” water on the water is biogas. The 1.5 mm thick film is like a lid, covering the biogas inside without leaking.
Biogas can be converted into electricity, which can be used for production and life of farm lighting, cooking, and pig house insulation. The “power” of this coated biogas digester is extraordinary: the gas tank can only store 200 cubic meters of biogas and can only generate electricity for 3 to 4 hours per day; while the coated biogas digester can store 2-3 thousand cubic meters of biogas It can generate electricity almost all day long.
Film-covered biogas digester has the advantages of large anaerobic fermentation volume, long sewage retention period, the large amount of biogas generation, and low operation and processing costs. It is very suitable for the treatment of aquaculture excrements in large-scale farms and “water bubble manure” technology farms. There are many benefits to building a mulch biogas digester. The most intuitive thing is that the “belly volume” is large, and the waste liquid that can be fed and the biogas that can be stored is one to twenty times more than the conventional biogas digester. It has natural advantages in terms of construction costs, maintenance management, and gas production, power generation, and sewage treatment. Therefore, it has strong economic, social, and ecological benefits. The covered biogas digester project can also save fertilizer. cost.
In addition, the project also saved sewage treatment costs. Manure is treated with biological compost and anaerobic fermentation to kill toxic and harmful germs, viruses and parasite eggs, eliminate mosquito and breeding grounds, reduce human and animal diseases, greatly reduce sewage and other harmful impurities, and reduce the impact on Pollution of groundwater and downstream water quality to protect the physical and mental health of local and downstream drinking water people.
At the same time, the covered biogas digester breaks through the traditional biogas digester construction materials. It uses an anti-seepage membrane material, which can effectively replace conventional pool construction materials (such as concrete, steel plates, bricks, etc.) at low cost to solve the shortage of materials for construction pools and the price. Higher issues.
It is reported that pollution from livestock breeding has become the third-largest pollution source after industrial pollution and domestic garbage pollution. In some areas, the discharge of pollutants from livestock and poultry farming has become one of the important reasons for water pollution and eutrophication. Waste from livestock breeding has seriously affected the sustainable development of animal husbandry. Especially in recent years, there is a shortage of breeder laborers in many farms, and many farms have converted the manure cleaning process into a “water bubble manure” process, which has mixed livestock and poultry manure and urine, which has caused severe overloading of sewage treatment projects constructed in previous years. Some have been paralyzed.
The membrane-covered biogas digester combines fermentation and gas storage and uses an impermeable membrane material to completely seal the entire anaerobic pond. It has simple and convenient construction, fast and low cost, simple process, convenient operation and maintenance, long sewage retention time, and digestion. Adequate, good sealing performance, the large amount of biogas produced per day, the high tensile strength of anti-seepage film material, strong anti-aging and corrosion resistance, good anti-seepage effect, use of biogas power generation waste heat, film absorption of sunlight, good temperature and heat preservation effect, pool The bottom is equipped with automatic sludge discharge device, and the amount of sludge in the pond is small.
At the same time, the covered biogas digester can also solve the problems of water seepage, leakage and gas leakage caused by shrinkage and expansion due to temperature changes in concrete biogas projects. Damage, high running costs, etc. This project meets the requirements of national development strategy and national industrial development direction, and relevant departments are currently studying and promoting it.
The only disadvantage of the covered biogas digester is that it covers a relatively large area. If biogas is needed to generate electricity, an anti-corrosion and explosion-proof supercharger must be added.