The physical object of this project concerns:- The study and construction of a new sewerage plant with a capacity of 2,900 inhabitants for the settlement of Aiani in the Municipality of Kozani and the training of personnel.- The construction of a new central sewerage pipeline connecting EEL with the existing sewerage network, with a total length of 2,462 m.- The interconnection of EEL with the networks of Public Benefit Organisations (OKO).- Exploratories.