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What is Bio Gas

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Rural Technology

Biogas is generated by the bacteria in cow dung. Cow cut the grass with its teeth. Broken grass is digested in cow’s stomach by bacteria. They broke it into chemicals and gases. The bacteria which come out with the dung continue with the same process, provided they are with condition similar to the cow’s stomach like Light and air have to be excluded and the dung has to be kept at a warm temperature, somewhere between 20ºC and 40ºC. This gives us biogas from the dung.

This kind of bacteria can digest other kind of bio wastes such as kitchen, any material with starch content as well. If solid waste is not disposed properly then it creates problems like increase in infectious diseases, contamination of ground water etc. Eco friendly ways of disposing the waste such as vermin- composting will help for small quantity of waste. Biogas Technology offers dual advantageous; it will generate biogas as source of energy and also provide slurry which is good quality manure. In this lesson we are going to study details of biogas plant.

Biogas constituents –

Biogas is the mixture of gases, consists mainly of methane (CH4: 60%) and cabon dioxide (CO2:40%) plus traces of hydrogen sulphide (H2S) and several other gases.

Biogas may be used in the following three ways: (i) Direct combustion for cooking, (ii) Generation of electricity and (iii) Purification and export as compressed gas or in liquid form. Just like CNG gas cylinders


Following feed is generally used in most of the biogas plant. 1. Cow dung 2. Human excreta 3. Non edible oil cake(like Mahuva ) 4. Food waste 5. Any material which has starch content

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