Biogas fermentation raw materials are very extensive and rich. There are many kinds of "idle resources" that can be used for biogas fermentation at present. There are 37 kinds of agricultural wastes in western European countries alone, including livestock manure and farmed and stocked crop wastes. Industrial wastewater 2 1 species, mostly from crop processing and food industry. There are also waste residue from sugar factories and waste water from slaughterhouses. Making full use of these "idle resources" and developing biogas energy is a realistic way to solve rural energy and treat urban garbage, which has great potential. According to the announcement of EC countries, about 1465438+ ten thousand tons of human and animal manure, 8.5 million tons of crop straw and 8.9 million tons of urban sewage are used for biogas production every year, totaling 365438+. If seaweed and aquatic plants are also used to produce biogas, the total potential can be tripled.

China has great potential for biogas production. According to estimates, if all the crop wastes and human and animal manure are fermented in the pond, biogas 1000 billion cubic meters can be produced every year. In addition to fully meeting the needs of rural domestic fuel, it can also provide millions of 5-8 kW biogas power stations with 6 hours of work every day. Since the early 1980s, nearly 600,000 biogas digesters have been built every year in China, and the biogas production level has been gradually improved. The utilization of biogas has moved from the field of life to the field of production, and has begun to move from rural areas to cities and towns.