Biogas usage
Practical Action
In using a bio-digester.
The cylinder of biogas should be covered with soil (then it is possible to protect it
from external hazards).
Avoid planting large trees near the
biogas digester (the camber can be
damaged by the roots of the tree).
Adding the raw-material
(Only in the Indian and Chinese methods)
Avoid heavy inorganic material such as stones, soil and sand getting into the cylinder
(If the above materials get into the digester, they will collect inside the digester and
reduce the capacity and therefore reduce the amount of biogas produced).
How to avoid heavy stuff getting into the digester
a) By constructing the cylinder
used to put in the raw material
as shown in the picture. The
unnecessary heavy material will
remain in the bottom.
b) The liquid raw material
can be mixed separately
and then added to the
digester.
1. The animal waste and water
can be mixed in a ratio of 1:1
and put into the digester (one
bucket of water to one bucket
of cow-dung).
2. Avoiding unwanted material
(polythene, grass, paper,
wood, etc) getting into the
digester.
6
Polythene
Grass
Plastic
Sawdust and
wood pieces