Scientifically speaking, biogas is a kind of combustible gas produced by microbial fermentation of various organic substances under isolated air (reducing conditions) at suitable temperature and PH value. Biogas belongs to secondary energy and is a renewable energy.
Methane, the main component of biogas, is an ideal gas fuel. Colorless and tasteless, it will burn when mixed with proper amount of air. The calorific value of pure methane per cubic meter is 34,000 kilojoules, and that of biogas per cubic meter is about 20,800-23,600 kilojoules. That is, after 1 m3 biogas is completely burned, it can generate heat equivalent to 0.7 kg anthracite. Compared with other fuels, it has better explosion-proof performance and is a good clean fuel.
Biogas was discovered in the swamp by Italian physicist A. Volta in 1776. 19 16, the first methanogenic bacteria (but not pure) was isolated from β п Omelyanski in Russia. Methanosporidia was successfully isolated for the first time in China on 1980. Nearly 20 kinds of methane have been isolated in the world.
References:
Entries in Baidu Encyclopedia-Biogas (combustible gas produced by organic microorganisms)