How does bio-gas plant help to reduce the problem of pollution?

Biogas is an excellent fuel for cooking purposes and it also contains 75% of methane because of which biogas burns without giving any kind of smoke and also do not leave any residue after being heated.

Since biogas also uses waste water, it removes the oxygen demanding pathogens present in the waste thereby preventing the pollution of water bodies.

Biogas plants contain the residue after all the organic matter is converted to gas. This residue is rich in phosphorous and nitrogen which are the two main nutrients for plants. Hence this residue can be used as an organic fertilizer for plants.