Overview
IDL_CANDELI is a secondary wastewater treatment plant serving Signa, Toscana, Italy. It treats wastewater from approximately 5,034 people with a designed capacity of 4,000 m³/day.
IDL_CANDELI is a municipal wastewater treatment plant located in Signa, in the Toscana region of Italy. The plant serves a population of approximately 5,034 people, classifying it as a small to medium agglomeration under Italian and EU regulations. It is situated near the Ombrone River, which flows through the Arno basin. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 4,000 m³/day, with an average daily discharge volume of 996.55 m³/day, indicating operational headroom. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. Treated effluent is discharged into the Ombrone River, a tributary of the Arno River, which ultimately flows into the Tyrrhenian Sea near Pisa. The Arno basin supports diverse aquatic life and is an important water resource for Tuscany. The plant's operation helps protect downstream water quality and the sensitive coastal environment of the Tyrrhenian Sea.
Environmental context
The plant discharges treated wastewater into the Ombrone River, a tributary of the Arno River. The Arno flows through Florence and Pisa before entering the Tyrrhenian Sea, a semi-enclosed sea with limited water exchange. The basin supports diverse aquatic ecosystems, including fish species such as the European eel and various cyprinids. Nutrient loads from wastewater can contribute to eutrophication in coastal areas, making secondary treatment essential for protecting marine water quality.
Frequently asked questions
IDL_CANDELI is located in Signa, in the Toscana region of Italy, near the Ombrone River.
The plant serves approximately 5,034 people, classifying it as a small to medium agglomeration under EU standards.
Treated wastewater is discharged into the Ombrone River, which flows into the Arno River and eventually reaches the Tyrrhenian Sea.
The plant provides secondary treatment, which is the minimum required by the EU Urban Waste Water Treatment Directive for freshwater discharges from agglomerations of this size.
The designed capacity is 4,000 m³/day, with an average daily discharge of 996.55 m³/day, indicating spare capacity for future growth.
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