we plan the world of tomorrow.
Todi and Porchiano WWTP (Italy)
REALIZATION OF A NEW FOUL SEWAGE COLLECTION NETWORK IN THE MUNICIPAL AREA OF TODI AND A NEW WASTEWATER TREATMENT PLANT WITH A TREATMENT CAPACITY OF 25,000 P.E. IN TODI-PORCHIANO (PERUGIA, ITALY).
Project: Sewerage network in the town of Todi and new wastewater treatment plant in Porchiano
Location: Province of Perugia, Italy
Client: Costruzioni Dondi S.p.A.
Cost of total Works: € 5.577.779,33 € 2.801.560,55 (sewage network) € 1.347.389,46 (WWTP)
Services: Final Design and Environmental Mitigation Study
The town of Todi and the surrounding area were served by numerous small treatment plants discharging their outfall directly into the Tiber river or its tributaries. The whole area is situated inside the Tiber River Nature Reserve and therefore required high efficiency treatment plants in terms of suspended solids and nutrients such as BOD, nitrogen and phosphorous. Many parts of the towns in the depuration district of Todi were without an adequate foul sewage network, and, in some cases, any network at all, so that outfalls were discharged directly into the ground. This situation called for the design of a new and integrated foul sewage network, linking the small treatment plants and directing the urban wastewater towards the new treatment plant.
- preliminary treatment: fine screening and horizontal aerated grit removal and equalization tanks
- secondary or biological treatment: nutrients removal using activated sludge process in mixed and aerated tanks operating in a total oxidation – long aeration system (denitrification, oxidation/nitrification steps) and secondary sedimentation in order to separate the liquid from the sludge phase
- tertiary treatment: membrane filtration and disinfection with UV light in open concrete channel
- sludge treatment: gravity thickening tanks and dewatering of the sludge by centrifuging