(best examples and good practices) on household organic waste ...

98
The building in the foreground houses the waste reception <strong>and</strong> mechanical
pretreatment parts of the process <strong>and</strong> the larger building in the background
houses the composting process. The main output is a bio-stabilized product
which is used for l<strong>and</strong>filling. The composting process uses a patented compost
turning machine which is called as the ‘CTM’ system (Picture 12.).
The waste material to be composted is loaded into bays that are aerated from
below <strong>and</strong> housed in a closed building. It takes 4-6 weeks to complete this
process <strong>and</strong> a further three weeks for the maturation of compost. The compost
is turned automatically by the ‘CTM’ system, which is essentially a bucket
wheel <strong>and</strong> conveyor system, which incorporates compost irrigation that
traverses each composting bay about five times during the initial 4-6 weeks
cycle.
Picture 12.: The Tufino plant in Italy.
(Wastesum project Del 3A., 2010)
Leachate from the composting process is collected <strong>and</strong> re-circulated as process
water. The off-gases from the composting process <strong>and</strong> the fugitive emissions
from the mechanical separation stage are collected <strong>and</strong> sent for treatment. The
off-gases are first scrubbed to reduce the levels of ammonia (NH3) <strong>and</strong> then
passed through a biofilter before being emitted to the atmosphere. Moreover,
the off -gases from the process <strong>and</strong> the fugitive emissions from the mechanical
pre-treatment plant were piped to separate scrubbers before they were treated
by bio-filtration. At the Tufino plant, no further mechanical separation of the
bio-stabilized materials is carried out <strong>and</strong> this output is being l<strong>and</strong>filled.
(Wastesum project Del 3A., 2010)