Biogas usage
Practical Action
Introduction to the biogas digester
There are three main types of biogas digesters.
There are:
1. The Indian biogas digester
This is a digester with an expandable gas cylinder or dome. As shown in the picture the waste
is being sent and collected from drains on either side. The digester is made using bricks and
cement.
The cylindrical dome is made of metal sheets and moves up and down as it stores and
releases the gas.
Mixture
Inlet pipe for
water material
Gas
Floating dome
Collection pit for digested
waste material
Central wall
Outlet for
digested waste
material
3