1. Introduction
Biogas is produced by anaerobic digestion of biological wastes such as cattle dung,
vegetable wastes, sheep and poultry droppings, municipal solid waste, industrial waste
water, land fill, etc. It is an environment friendly, clean, cheap and versatile fuel.
Historically, the biogas technology is over a hundred years old in India. The National
Project on Biogas Development (NPBD) was launched by Government of India in 1981