Pa For The Assignment Of Services Connected To The Mechanical Dehydration Service Using Mobile Units Of Biological Sludge Produced In Purification Sites, Managed By Hera S.P.A. - Water Operations Areas - And To Heracquamodena S.R.L. For The Period Of 24 Months, Starting Approximately From 01/04/2026 To 31/03/2028, Possibly Extendable For A Further 24 Months