1.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.

2.The bacteria which Come out with the dung continue with the same process, provided they are with Condition similar to the Cows stomach like light and air have to be excluded and the dung has to be kept at a warm temperature, Somewhere between 20°c and voc. This gives us biogas from the dung.
3.This kind of bacteria can digest other kind of bio wastes Such as kitchen, any material with starch Content as well.
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BioGas Constituents:-

•Bogas is the mirture of gases, Consists mainly of methane (CHu: 60%) and Carbondioxide (CO2: 40%•) plus traces of hydrogen sulphide (HS) and Several other gases.
Biogos may be used in the following three ways: li) rDirect Combustion for Cooking,
(ii) Generation of slectricity, and
Lipurification and Export as compressed gas or in liquid form, just like eNG gas cylinder’s.
FEED:-
Following feed is generally used in most of the biogos plant:

1.Cow dung,

2.Human excreta,

3.Non edible oil coke (like Mahuva),H• waste. food,

4. Any material which has starch content.

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Advantages a Biogas

1.The technology is cheaper and much simpler.

2.Slurry is very good manure and can be used as Pertilizer and also in preparation of vermicompost.
3.Wast material is used to generate electricity os well as good fertilizer.

4.The digested material coming out of the plant will not have any odor and there will not be any mosquito linsects breeding on the same.

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It has following Components.
1• Feed inlet: – From where feed is fed into the system.
2′ Digester tank!- where the feed and water will stay for Same and bacterial operation will get Completed.
3.⁠ ⁠Gas holder:- It stores biogas generated.
4• Outlet gas:-Gas generated is Supplied through outlet value.
5.⁠ ⁠outlet slurry:- Slurry is discharged from outlet pipe.

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Types of Biogas plant
Based on various designs of digester, biogas are etassified as :
1.⁠ ⁠Floating Dome type (KVIc model)
2.⁠ ⁠Fixed Dome type (Janata model)
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Floating Dome type (KVIC) type:-
in this model the gas stored in a tank. The tank is floating in slurry. Tank goes up as the gos gets generated and it lowers when the you is Consumed. The size of tank depends on the size of the feed. Normally, It is 50 times the amount of feed available per day.
Fa Frample if zolits of dung water mixture is pot into a pant everyday we need tank of 20×50=1000 Ltr. Capacity.

1.Generally, tank is made out of iorn sheets. Therefore,
Cost of the
2.biogas goes up- Recently many organiza-
tions started using pVc tanks.
•Fixed dome type ( janata Model):-
It is built either of cement – Concrete or brick-walled. The gas is stored in the upper dome with increase in gas pressure in dome rises up. It pushes of the digested material out of the tank. The cost of a fixed dome biogas plant is relatively low It is simple as no moving parts sxist. There are also no rusting steel parts and hencera long life of the plant (20 years or more) Can be Expected Fixed dome plants are not easy to build -They should only be built where construction can be supervised by experienced biogas technicians. Due to the porosity & Cracks, gos generated may leak.