Strategic Action Plan - International Environmental Technology Centre

Strategic Action Plan Report
S.
N.
Item
fall below 10-20
Comment
8 pH pH should not be raised above 8.5 to minimize the loss of nitrogen in the
form of ammonia. It should be between 5-7
9 Control of
Pathogens
It is possible to kill all the pathogens weed and seeds during composting
and to do this the temp must be maintained between 60-70 0 C
5.3.2 Biomethanation
Biomethanation is an anaerobic digestion process where the segregated organic fraction of waste is fed
to a closed container called biogas digester. Under anaerobic conditions, the organic waste undergoes biodegradation
producing methane-rich biogas and sludge. The process is carried out in airtight reactor. Feed
sludge introduced continuously or intermittently is retained in the reactor for varying period of time. The
stabilized sludge is withdrawn continuously or intermittently from the reactor. The biogas production ranges
from 50-100 m 3 /tonne of feed waste depending upon the composition of waste.
The biogas can be utilized either for cooking/heating applications, or through duel fuel or gas engine or
gas/steam turbines for generating motive power or electricity. The sludge from anaerobic digestion, after
stabilization, can be used as a soil conditioner, or even sold as manure depending upon its composition. A
typical Biomethanation plant is shown in Figure 5.4.
Figure 5.4: A typical Biomethanation plant 1
1 As obtained from www.mailhem.com
ISWM Plan for Pune 94