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

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around 70,000 inhabitants. The garden <strong>and</strong> kitchen waste is collected
separately at source <strong>and</strong> transferred by the Municipalities at the facility.
In (Figure 54.) the flow diagram of the processes is shown. Waste is received
<strong>and</strong> is placed inside the parallel compost tunnels where the composting process
takes place. The input waste does not receive any pre-treatment. The compost
mix remains inside the composting tunnels for 10 days. The aeration system is
that of forced aeration; via thous<strong>and</strong>s of under-floor nozzles pressurized air is
passed through the material to be processed, thus initiating the composting
process. During this process part of the organic matter is degraded <strong>and</strong> water
vaporizes, resulting in stable compost as the end product.
The tunneling system does not have any leachate collection system or water
provision system. The material is then screened. The reject stream (i.e. course
material) is mixed together with the new input material <strong>and</strong> is thus composted
again. The material that passes the screen (i.e. fine material) is the final
compost that is packaged accordingly. The energy required for the whole
process is low (approximately 15 kWh/ton of incoming waste). This facility is a
simple low cost facility.
Figure 54.: Flow Diagram of the Composting Process in Lelystad Plant in
Netherl<strong>and</strong>s
(Wastesum project Del 3A,. 2010)