The expansion of the existing sewage treatment plant, implements the 1998 “Reconciliation Program for the Development of Gorizia (Italy), Nova Gorica (Slovenia) and Šempeter Vrtojba (Slovenia)”, providing for the interconnection of the service networks within the border region by establishing a joint service of collection and treatment of wastewater. The project is divided into two phases: the first, to upgrade the plant to serve up to 120,000 equivalent inhabitants, the second to upgrade it up to 200.000 eq. in.
The project was part of those subject to the procedure of Environmental Impact Assessment for which it has been necessary to prepare an Environmental Impact Study regarding the system to its maximum potential, highlighting the subsequent construction phases. The work methodology allowed the development of the activities for successive steps, comparing them with the multidisciplinary project planning tools, studying the area to provide a climate, hydrological, socio-economic and natural framework.
Construction, management and possible, eventual disposal of the plant to highlight concerns, pressures, impacts and verifying the presence of alternatives. A matrix methodology has been adopted to identify potential environmental changes, both in terms of quality and quantity, through the attribution of weights and relevances based on the value of the involved resources. Moreover, a sewage inlet and outlet monitoring system as well as of the technological systems, defining the cost-benefit ratio of the plant comparing and identifying strengths and weaknesses of the adopted technologies.