The project concerns the treatment and disposal of waste water from the Municipal Unit of Amfissa, the Biotechnical Park (BIOPA) Amfissa and the prisons of Malandrino of the Municipality of Delphi. It is an existing project, but it needs to be upgraded and modernised. The Wastewater Treatment Plant (ESI) will include the following individual processes:(a) Reception of sewage disposal for agglomerations not served by a sewer network (new project): Sewage reception, grate and pumping system.(b) Pre-treatment of sewage and sewage (new project): Grating, emulsion, degreasing. c) Balancing of incoming sewage (new project).d) Secondary biological treatment: Activated sludge system with nitrogen removal (existing and new work). Flocculation, clarification, final effluent (existing and new project) treatment plant (new project).(g) Disposal of treated waste water to stream “Skitsa” (new project).(i) Sludge treatment: Fattening tank, dehydration plant, temporary storage area of dehydrated sludge (existing and new project).The selection of individual treatment systems was based on ensuring high quality output and minimising nuisances.