Page 17 - Primary Seven Notes
P. 17
These materials are put together in a bur¬
ied, sealed, air-tight container called a
digester. They are left to decompose
or ferment with the help of the bac¬
teria uponwhich biogas is pro¬
duced. This gas can be used for
cooking, lighting or heating.
When the gas formation stops,
the remains in the digester are
called sludge and canbe used Bio
as manure in the garden.
Gas storage tank
Gas control valve (outlet for biogas)
\
;; : V
cu I • «
rr— * µ iMP*
Mixing tank
Over flow tank
(!
|
Inlet pipe
Outlet pipe
I \
Inlet tank
i Partition wal
Digester tank I - I
S
