The residue left after methane production from cattle dung is
1. burnt
2. buried in land fills
3. used as manure
4. used in civil construction
consists of a concrete tank (10-15 feet deep) in which bio-wastes are collected and a
slurry of dung is fed.
A floating cover is placed over the slurry, which keeps on rising as the gas is produced
in the tank due to the microbial activity. Methanobacterium in the dung act on the
bio-wastes to produce bio-gas. The gas produced is supplied to nearby houses by an
outlet. Through another outlet, the spent slurry is removed to be used as manure.
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