A
sealed water-tight circular pit, normally about
ten feet deep, is made of concrete to which manure
(from cows, buffalos and other livestock) is added
regularly. As far as adding human waste to the
mix, even though bacteria is killed in the combustion
process, it is generally not done. Alternate materials
may be used for constructing this pit as desired.
A wall is built across the middle of the pit,
extending from the bottom almost to the top.
The
manure is mixed with water in the intake basin
which flows thru the piping to the bottom of the
left side. This side of the cylinder gradually
fills and overflows to the right side. When both
sides of the cylinder are full, the manure effluent
flows out from the bottom of the right side each
time more raw manure is added to the left.
Manure residue from the decomposition process
comes out in a concentrated form and is used for
fertilizer. What comes out on the right is of
more value as fertilizer than the raw manure.
So the methane gas produced from this decomposition
is an added byproduct which is literally "something
for nothing," after the initial construction
expense.
The concoction produces methane which rises to
the top and collects under a large metal dome
As the gas builds pressure it is routed via a
rubber tube to a gas stove in a kitchen where
it is used for cooking.
India is a leader in gobar gas technology, and
there are perhaps hundreds of thousands of gobar
gas plants in India.
Please
read the following related articles for further
information:
Gobar
Gas Methane Experiments in India
Proposal
to Generate Compressed Gobar Gas
Biogas
(Gobar) Technology
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