The choice between centralization and decentralization of wastewater treatment depends on many factors and requires a case-specific approach. Most of Italian plants are small, but they altogether treat only a little fraction of total pollutant load and must comply with different local regulations. This paper reports some examples of upgrading of small overloaded plants with advanced technologies; three plants were upgraded with moving bed biofilm reactors, two plants with dissolved air flotation and a plant with a new line of membrane bioreactors. In all these plants pollutants removal efficiencies improved with minimal additional space request or with just recovery or conversion of existing tanks.
Small Wastewater Treatment Plants in Italy: Situation and Case Studies of Upgrading
FALLETTI, LUIGI;CONTE, LINO;ZAGGIA, ALESSANDRO
2011
Abstract
The choice between centralization and decentralization of wastewater treatment depends on many factors and requires a case-specific approach. Most of Italian plants are small, but they altogether treat only a little fraction of total pollutant load and must comply with different local regulations. This paper reports some examples of upgrading of small overloaded plants with advanced technologies; three plants were upgraded with moving bed biofilm reactors, two plants with dissolved air flotation and a plant with a new line of membrane bioreactors. In all these plants pollutants removal efficiencies improved with minimal additional space request or with just recovery or conversion of existing tanks.
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