Bio gas is considered as very useful for farmers because farmers can use animal dung, weeds, biogas etc for their daily energy source. Apart from it gobar gas or bio gas is best way to cook food and light bulb in place of fossil fuel which is more expensive and has to be bought. Finally they can make god manure for agricultural product instead of buying the manure for cultivation and soil. So, bio gas is very useful for farmers.
Agricultural biogas plants utilise organic materials found on farms to generate biogas, a renewable fuel source and in turn renewable power through cogeneration / combined heat and power. The plant may be designed to accept energy crops that have been grown specifically to input into the digestion facility or agricultural wastes. These crops are typically ensilaged and stored in clamps or hoppers and are continuously fed into the digester throughout the year. In India biogas plants may be called gober gas plants.Agricultural biogas plants typically consist of several low digester tanks built either from concrete or metal. They are often topped by a twin-skinned gas storage bag, giving them a characteristic appearance. The majority of biogas will be produced by the first digestion tank with a lower gas yield being attained in the secondary digestate storage tank.
Typical energy crops for biogas production can include:
- Maize
- Grass
- Wheat
- Rye
- Triticale
- Crassuleacean acid metabolism (CAM) plants such as pineapples
A useful approximate rule of thumb is that for 1 acre (0.405 hectares) of whole crop maize will produce enough gas to generate 1kW of electrical power – i.e. it takes 500 acres of whole crop maize silage to produce sufficient feedstock for a 500kWe digester / gas engine combination.