The Subject Of The Contract Is The Management Of The Excess Biological Sludge Resulting From The Operation Of Eel. Eordea, Through The Combined Application Of The Method Of Bio -Resolution And, At The Same Time, The Collection, Transportation And Final Disposal Of The Excess Excess Dehydrated Sludge, As Well As The Other By -Products Of The Preparation Of The Sewage And In Particular The Collection Of Sand. No. 8/2025