The physical object of the segmented phasing operation includes the design and construction of a new wastewater treatment plant with a capacity of 2900 inhabitants for the settlement of Aiani in the Municipality of Kozani and the training of staff The construction of a new central sewerage pipeline connecting the WWTP with the existing sewerage network with a total length of 2462 m The interconnection of the WWTP with the networks of Public Utilities OKO Exploratory Archaeology SectionsIn Phase A was included The expenditure for the WWTP PROCESSING INSTALLATION OF AIANIS D KOZANIS paid up to 21122023 including the 3rd Payment Order Final Implementation Study and construction works of the WWTP Implementation of item 1815 1st Subproject A Phase Completion of the CENTRALEMENT OF AIANIS D KOZANIS 2nd Subproject Phase A and The completion of the required exploratory sections of archaeological interest 4th Subproject Phase A In the Phase B, the remaining works for the completion of the AIANI D KOZANI WASTEWATER PROCESSING INSTALLATION and the required accompanying works of the WWTP networks connection to the water supply network telecommunications3rd Subproject Phase A