WATER SUPPLY & SEWERAGE
Sewerage system for Pellestrina - Venice Lagoon - Italy

Client:                          Venezia Nuova Consortium for the Ministry of Public Works - Water Board (Venice)

Services:                    Surveys and investigations; Preliminary and Detailed design                                  

Period:                        1987 - 1998

Construction cost:   € 6,663,000    

The project:

In the context of the project to protect Pellestrina from the high tides TECHNITAL carried out the Preliminary and Detailed design of the sewerage network for the township of Pellestrina (4200 inhabitants).

The new sewerage network, consisting of a free surface flow system for mixed sewage, is designed to operate for a certain period until the Municipality of Venice sets up a treatment plant connecting the secondary sewerage pipes from the houses and the lagoon. These sewers, which have little or no gradient, are kept clear by the tidal flow.

The system will operate in this period only in occasion of the high tides, when the sewerage outlets into the lagoon have to be closed to prevent the tidal flow from rising up through the rainwater gulleys.

The sewage is disposed of by pumps located in 7 pumping stations, which at present convey it directly into the lagoon by means of underwater pipes and diffusers and which in the future, when the new treatment plant has been built, will provide the necessary head to convey the sewage there.

The project affects the entire historic centre, the system having a total length of 2800 m. Twenty-one submerged  pumps with sequential operation have been installed, for a total applied capacity of approximately 300 KW.

The works have been completed.

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