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

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

11.11.2014 Views

117 It must be mentioned that everything takes place automatically ong>andong> no personnel is required to carry out the process. Only one person is enough for the management of the whole operation. The facility needs approximately 30 KWH/ton of water of energy to operate while the performance of it depends on the weather. In the winter approximately 15 ton/day of sludge is been dried while in the summer (when the greenhouse performance is higher) almost 25-30 tons/day of sludge is been processed. Finally, the facility takes about 1000 m 2 of space ong>andong> its cost is approximately 600.000 euros. 7.3.3. The Kaiserslautern plant in Germany The plant (Picture 28.) is located near the municipal long>andong>fill. Gas engines produce electricity by the combustion of the long>andong>fill gas ong>andong> the biogas produced by the anaerobic digestion plant. The waste heat of the gas engines is utilized to evaporate the excess waste water.(European Commission.,2010) Picture 28.: The Kaiserslautern plant in Germany (Wastesum project Del 3A,. 2010) The DRANCO process is a patented thermophilic one phase digestion system with external inoculation. There is no mixing apparatus in the digester. The

118 process treats the wastes as concentrated as possible, resulting in a total solids content inside the digester between 15 ong>andong> 40%, depending on the waste composition. Most of the DRANCO plants are treating source separated biowastes. However, the DRANCO installation can also hong>andong>le grey waste (the residual organic fraction of MSW). The plant has a capacity of 20.000 tons per year municipal solid waste. (European Commission.,2010) The waste is dumped in a bunker which can be closed off in order to limit odour emissions. A pushing floor at the bottom of the bunker is transporting the waste to the pre-treatment station. The pre-treatment station consists of a cascade mill, a screen of 40 mm ong>andong> an over-belt magnet. The oversize of the screen is long>andong>filled or sent for thermal treatment. The undersize, about 18.000 tons per year, is sent to a 200 m³ buffer. (European Commission.,2010) The pretreatment is functioning five days a week. The buffer allows the feeding of the digester during the weekend so that a continuous gas production is secured. Before being pumped into the fermentation reactor the substrate is mixed with digested residue ong>andong> a small amount of steam, in order to heat up the substrate to about 50 °C. (Figure 4.15) shows the schematic flow of the Kaiserslautern plant in Germany. (European Commission.,2010) Figure 34.: The schematic flow of the Kaiserslautern plant in Germany. (Wastesum project Del 3A., 2010)

117<br />

It must be menti<strong>on</strong>ed that everything takes place automatically <str<strong>on</strong>g>and</str<strong>on</strong>g> no<br />

pers<strong>on</strong>nel is required to carry out the process. Only <strong>on</strong>e pers<strong>on</strong> is enough for<br />

the management of the whole operati<strong>on</strong>.<br />

The facility needs approximately 30 KWH/t<strong>on</strong> of water of energy to operate<br />

while the performance of it depends <strong>on</strong> the weather. In the winter<br />

approximately 15 t<strong>on</strong>/day of sludge is been dried while in the summer (when<br />

the greenhouse performance is higher) almost 25-30 t<strong>on</strong>s/day of sludge is been<br />

processed. Finally, the facility takes about 1000 m 2 of space <str<strong>on</strong>g>and</str<strong>on</strong>g> its cost is<br />

approximately 600.000 euros.<br />

7.3.3. The Kaiserslautern plant in Germany<br />

The plant (Picture 28.) is located near the municipal l<str<strong>on</strong>g>and</str<strong>on</strong>g>fill. Gas engines<br />

produce electricity by the combusti<strong>on</strong> of the l<str<strong>on</strong>g>and</str<strong>on</strong>g>fill gas <str<strong>on</strong>g>and</str<strong>on</strong>g> the biogas<br />

produced by the anaerobic digesti<strong>on</strong> plant. The <strong>waste</strong> heat of the gas engines is<br />

utilized to evaporate the excess <strong>waste</strong> water.(European Commissi<strong>on</strong>.,2010)<br />

Picture 28.: The Kaiserslautern plant in Germany<br />

(Wastesum project Del 3A,. 2010)<br />

The DRANCO process is a patented thermophilic <strong>on</strong>e phase digesti<strong>on</strong> system<br />

with external inoculati<strong>on</strong>. There is no mixing apparatus in the digester. The

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