(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

215 Moreover, a low quantity of mature compost was added to the system in order to support the composting process as well as a specific quantity of sawdust (in order to increase the carbon content that was available for the development of the biochemical actions in the composting compartment by the microorganisms as well to optimize the aeration conditions of the material that was subjected to composting). The product obtained was temporarily stored by the householders in appropriate biodegradable bags. The bags had the capacity to store the quantity of compost that produced during a period of three months for each household. Finally the final product was used in their gardens as a soil improver with great success. (Comwaste.,2010) Picture 68.: Final product (compost) (Comwaste.,2010) 11.4.4. Psitallia Sludge Drying Facility The psitallia sludge drying facility started operating in 2007. The facility was installed by the International Technology Group Andritz ong>andong> is part of the psitallia sewage sludge facility in Athens. Psitallia had a problem coming from (wet sludge odours). The sludge processing capacity of the facility was so big that the excess sludge stayed outside to dry. The result was intolerable odours coming from the facility. The drying sludge facility came to solve this problem. (EYDAP.,2010)

216 Picture 69.: Psitallia sewage sludge treatment facility (EYDAP.,2010) The drum drying system (DDS) provides today one of the largest sewage-sludge drying capacity in all of Europe. Picture 70.: Drum Drying System (EYDAP.,2010) The process of drying starts after the sludge from the sewage treatment facility, enters the DDS system. The evaporation capacity of the system is approximately 10,000 kg of water per hour ong>andong> line while almost 350000 tons of sludge can be treated in the plant every year. The dried sludge is used as a high calorific value fuel. heating of the plant is almost exclusively done with off-heat from a gas-turbine ong>andong> the biogas produced in the sewage system. The final product is 90% dry. The offgas from the drying system is treated in a thermal post-treatment station, where odours ong>andong> harmful substances are removed. (EYDAP.,2010)

215<br />

Moreover, a low quantity of mature compost was added to the system in order<br />

to support the composting process as well as a specific quantity of sawdust (in<br />

order to increase the carb<strong>on</strong> c<strong>on</strong>tent that was available for the development of<br />

the biochemical acti<strong>on</strong>s in the composting compartment by the<br />

microorganisms as well to optimize the aerati<strong>on</strong> c<strong>on</strong>diti<strong>on</strong>s of the material that<br />

was subjected to composting). The product obtained was temporarily stored by<br />

the <strong>household</strong>ers in appropriate biodegradable bags. The bags had the capacity<br />

to store the quantity of compost that produced during a period of three m<strong>on</strong>ths<br />

for each <strong>household</strong>. Finally the final product was used in their gardens as a soil<br />

improver with great success. (Com<strong>waste</strong>.,2010)<br />

Picture 68.: Final product (compost)<br />

(Com<strong>waste</strong>.,2010)<br />

11.4.4. Psitallia Sludge Drying Facility<br />

The psitallia sludge drying facility started operating in 2007. The facility was<br />

installed by the Internati<strong>on</strong>al Technology Group Andritz <str<strong>on</strong>g>and</str<strong>on</strong>g> is part of the<br />

psitallia sewage sludge facility in Athens. Psitallia had a problem coming from<br />

(wet sludge odours). The sludge processing capacity of the facility was so big<br />

that the excess sludge stayed outside to dry. The result was intolerable odours<br />

coming from the facility. The drying sludge facility came to solve this problem.<br />

(EYDAP.,2010)

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