GOBAR is derived from Hindi word "gobar" meaning Dung . That is , this is a raw material that can be got easily . a ton of it can make your house hold supply for several days.
Gobar Gas
As the gobar gas production is an anaerobic process, it is carried out in an air tight, closed cylindrical concrete tank called a digester. The tank has a concrete inlet basin on one side for feeding fresh cattle dung (gobar). There is a concrete outlet on the outer side for removing the digested sludge. The top of the tank serves as the gas tank. It has an outlet pipe for the gobar gas.
This is how it works as numbered in diagram above.
1. Mixing tank with inlet pipe and sand trap.
2. Digester.
3. Compensation and removal tank.
4. Gasholder.
5. Gas pipe.
6. Entry hatch, with gastight seal.
7. Accumulation of thick sludge.
8. Outlet pipe.
9. Reference level.
10. Scum.
Fresh cattle dung is mixed with equal amount of water, and fed daily into the digester tank through the inlet (1) and allowed to remain there. Gobar gas collects in the space above the slurry in the main tank (4).
Frame with Chicken Mesh for making RCC dome.
It is conducted through the outlet pipe (5) and used for domestic purposes. The digested sludge (digested biomass) is automatically removed from the tank through (8) and is an excellent fertilizer.
It is smooth and continuous process. The only thing is that the degree of digestion of the gobar from the beginning to the end is determined by the ambient temperature. So if the temperature is not high enough then all the gobar is not digested and so we get less gas and the output slurry is not as rich in Nitrogen and so is not such a good fertilizer. Anyway that is the price in these cold climates.
8 Ft Pit for installing New Gobar Gas Plant near New Cow Shed.
Dome of Gobar Gas plant installed with rough finished surface.
Above are photos of construction of 2 new gobar gas plants of 4 cu ft capacity each. This will be fed with the cow shed output as well as the toilet output of Main House, Cheese Room and New Cottage. The gas resulting will feed all the structures.
As the volume of these units is larger, the distance that the gobar gas can be sent and used is more and so it will be able to service all the main structures. It remains to be seen how much of our needs we can meet with this capacity.
Manual on Deenbandhu Biogas Plant
I would strongly recommend that you order the 'Manual on Deenbandhu Biogas Plant' by J.B. Singh, Raymond Myles, Anil Dhussa. Price: Rs 200/- per copy (49 pages).
Published by Tata-McGraw Hill Publishing Company Limited, New Delhi, 1997
It has a lot of information on history, design, construction and maintainence of a Deenbandhi model gobar gas plant. It also has drawings and tables for size of plant, gobar input etc.
TO ORDER SEND EMAIL TO:
Mr. S. M. RaviKumar Officiating Unit Manager AFPRO Field Unit II, Bangalore
Phone:91-80-2-5-461-711 Fax:91-80-2-546-1712 afu02@afpro.org
The Manual is well worth getting as it has a lot of info and also has all the drawings and dimensions and a step by step sketch explanation of the construction process. It is only Rs 200/- per copy.
People who built these gobar gas plants
Khadi and Village Industries Commission (K.V.I.C.)
In our area it was Mr. Saji John - 94439-00727 OR 98861-99515
Mr Roy - 04262-22-6321
The A.D.O. of KVIC is a very helpful gentleman called Mr. Jaibalu and his mobile is 098941-93057.
We too built the plant and It was a pleasant experience.
