Question

what is biogas? Which component of the biogas is used as a fuel? Name the constituents of biogas.

Answer 1

a) Biogas is usually methane which is collected from animal manure and other organic material which gives off methane as it decomposes anaerobically (that is, without air). 

If this gas is collected in a centralized plant it can be used to create energy by generating electricity. 

Any residue is available as an organic fertilizer which is less harmful than chemical fertilizers. In detail Biogas consists of methane and is thus the same kind of gas to natural gas. The difference is how it is formed. Natural gas is stored in the earth's crust as oil, while biogas is renewable and is made of organic material. The material (eg sewage sludge, manure, meat and catering waste) rots in an oxygen-free environment and in the process forms a gas composed of methane and carbon dioxide. The gas is purified from carbon dioxide and the remaining is a gas consisting of 97 percent methane that can be used as a vehicle fuel or to generate electricity. Biogas is a renewable biofuel, and is classified as one of our cleanest fuels. If biogas is used as vehicle fuel instead of gasoline it reduces emissions and the use of fossil oil. Biogas is formed in a natural degradation process of biological material, and, unlike petrol and diesel, is a renewable energy source that is part of nature's cycle.
                  b)The gases methane, hydrogen, and carbon monoxide (CO) can be combusted or oxidized with oxygen. This energy release allows biogas to be used as a fuel
C)  The major constituent of biogas is methane (55-70%), CO2(30-45%) and some traces of gases such as H2S and ammonia. Common digesterfeedstock (feeding material) is cow, buffalo, and pig manure" (Buysman, 2009).

Answer 2

biogas is produced by anaerobic degradation of animal wastes like cow dong in presence of water
biogase mixture of methane, carbon dioxide, hydrogen, hydrogen sulphide.

the constituent is methane