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The energy production plants and waste to energy plants produce waste process water. Some plants discharge into the sewers, others - after a purification treatment - into surface water courses.
Continuous analyses are carried out on certain parameters of the discharges, such as turbidity, pH level, electric conduction, oils, dissolved oxygen and temperature. All the discharges are regularly analysed to ensure that the limits set by current legislation are complied with.
In the thermoelectric power stations the water withdrawn for cooling the thermodynamic cycle is discharged at a slightly higher temperature, but is unaltered from a chemical and biological standpoint.

  • the Muzza canal for the Cassano d’Adda (Milan) power station

  • the Parea quarry for the Silla (Milan) waste to energy plant

  • the lakes Guzzetto and Garzetta for the Lamarmora (Brescia) power station

  • the River Mincio for the Ponti sul Mincio (Mantua) power station

  • the Lisert canal and the Valentinis canal, which flow into the Gulf of Panzano for the Monfalcone (Gorizia) power station

  • the Regi Lagni canal that flows into the River Volturno, for the Acerra waste to energy plant and the STIR at Caivano (Naples).

Gissi power station: only recycled water and no water discharges

The main source of water for the Gissi (CH) thermoelectric power station, which is needed to feed the steam heat cycle and for other less important purposes, is the purifier of the Consortium for the Area of Industrial Development of Vasto, which treats the civil and industrial discharges of the municipality of Gissi.
In addition, specific planning decisions have been taken to minimise water withdrawal. In particular, the plant has the following:

  • air condensers which cancel the requests for water for the condensation of the steam;

  • aerotherms for cooling the auxiliaries;

  • recovery of process discharges and rainwater for the production of water.

Being air-cooled and with the complete recovery of process and rainwater, there are no kinds of process water discharges at the power station.