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Athens' sludge island opens

Athens is so highly populated that a sewage treatment plant had nowhere to go except on an island.
Located on Athens' former off-shore prison island, 2.2km out in the Saronic Gulf, is Psttyalia, one of the largest effluent treatment sites in the world.

The Greek Ministry of Public Works appointed Pell Frischmann to design a new sludge thermal drying plant to produce a granular product that can be used as a fuel for the cement industry.

Prior to 1994, sewage and effluent from Athens went directly into the sea around the Greek capital.

Primary treatment was installed at Psttyalia in 1994, and secondary treatment just before the 2004 Olympics. The secondary treated effluent now leaves the plant 2km out to sea at a depth of 64m. 1Mm3 of effluent is treated per day – around 12,000 litres per second.

This generates 800t of dewatered sludge every day. The new plant will reduce the quantity of effluent leaving the city, and making the sea cleaner.

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