How To Build a 100 cu. ft./day Methane Gas Plant
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The gas collector is a roofed cylinder five feet in
diameter and four feet high constructed of 12-gauge machine
steel sheeting. It is braced internally with angle irons
fitted at different heights so that when the collector is
rotated around its guide pipe the scum on the surface of
the slurry will be broken. The cylinder will first be
riveted, welded, tested for leaks by filling with water and
finish-welded. After all leaks are sealed it should be
given two coats of enamel paint inside and out. The top
will be covered with an insulating material.
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The top of the gas collector is also fitted with a 1" tap
and valve, and to this is connected a flexible pipe leading
to your gas appliances. Inside the tap a piece of wire mesh
is attached to serve as a flame arrester. The actual
capacity of the gas holder is less than 100 cubic feet, but
if the gas is being used regularly there's no need to make
it larger.
The mixing tank is a cylinder 2'4" in diameter and two feet
high. Its floor is one foot above ground level to provide
hydraulic head to feed the plant. The inlet pipe opening is
flush with the bottom of the mixing tank and is covered
with a coarse screen to prevent large pieces of waste from
being ingested. The tank may be built of bricks or concrete
and is about 8-1/2 cubic feet in volume, sufficient for the
daily charge of waste matter.
The discharge pit should be large enough to accommodate all
the spent slurry that is expected to accumulate at a time.
It's made of bricks or concrete and the discharge end of
the outlet pipe should be just even with ground level.
An earth walkway at least three feet wide and level with
the top of the plant should be raised outside the brick
wall for support and additional insulation.
Approximate cost of materials for this plant in the United
States is $400.
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