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

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Picture 34.: Delivery crane in Rennerod plant in Germany
(Wastesum project Del 3A. ,2010)
Then the aerobic decomposition takes place in the closed, air <strong>and</strong> liquid boxes
(made of thermally insulated reinforced concrete) for 6 days. Moreover, it has
to be mentioned that the residual waste is also sanitized during this time. As
the air supply is adjusted to suit the biological needs of the decomposing
microorganisms, the easily degradable organic substance is microbiologically
converted in a very short time. The heat produced during this process is used to
remove the moisture (condensate) <strong>and</strong> thus for drying the residual waste. The
drying of the waste is the prerequisite for a separation of the waste mixture into
clean fractions of its recyclables like metals/ inert materials/ glass <strong>and</strong>
energetically usable SRF components. Condensate is separated out of the moist
waste air via a heat exchanger system, which is then fed into a water treatment
plant.
Following the completion of the drying stage, the composting boxes are
emptied using the automated process crane analogue to the waste delivery. A
condensate treatment (Picture 35.) is integrated in the Rennerod plant. The
moisture contained in the waste is removed from the waste air in the cycle via a
heat exchanger system. The condensate separated out is fed into a 2-stage
cleaning plant, consisting of a high-performance biological stage <strong>and</strong> a
downstream ultra filtration stage. Following this treatment process, the cleaned
condensate (permeate) is fed into the cooling circuit of the system as service
water <strong>and</strong> evaporates via an open evaporative cooler. In this way, the plant can
operate without producing wastewater.