It is estimated that the remaining sludge of 150,000 to 160,000 tons that was accumulated on the island over the years when only the primary treatment was active, would be converted to biofuel in the first six months of operation, and used in industry, especially in cement kilns and electricity power plants. On October 5, 2007, environment vice-minister Themistoklis Xanthopoulos announced that there would be no sludge left in the following five months, and that auditors such as the European Court of Auditors had approved the quality of the plant.
Approximately 150,000 to 160,000 tons of accumulated sludge on the island over years when only primary treatment was applied would be converted into biofuel within six months. On October 5, 2007, environment vice-minister Themistoklis Xanthopoulos stated that no sludge would remain in five months, and auditors such as the European Court of Auditors confirmed the plant's quality.