Eni Rewind is engaged in the implementation of major groundwater remediation interventions throughout the national territory. The activities are implemented through an integrated aquifer interception system – consisting of 1,000 pumping wells and 2,000 monitoring wells – and the conveyance of water to treatment plants for purification. Eni Rewind manages 42 groundwater treatment plants, 25 of which are its own property, and in 2019 treated 31 million cubic metres of water, recovering about 5 million mainly for industrial use. Since October 2017 Eni’s environmental society has also been managing water pumping and treatment systems in Gela, for the refinery.
Plants use specific technologies according to contaminants present and salt levels, with chemical-physical (metals), stripping (organic chlorinates), active carbon filtering (organic substances), biological treatment (ammonia compounds), osmosis (salt removal) and purification sections for the re-emission of water into the aquifer, so that it can be recovered or reused at Eni sites.