Caiazzo Impianto del Capoluogo Nord - Secondary Wastewater Treatment Plant in Caiazzo, Italy

Caiazzo Impianto del Capoluogo Nord is a municipal wastewater treatment plant located in Caiazzo, a town in the Campania region of southern Italy. The plant serves a population of 1,500 and has a designed capacity of 2,500 cubic meters per day, indicating it operates below its full capacity. It provides secondary treatment, which is the standard biological treatment stage required for urban wastewater under Italian and European regulations. As a secondary treatment facility, the plant uses biological processes to break down organic matter and reduce pollutants before discharge. The plant's discharge volume of 296.95 cubic meters per day reflects the current inflow from the local community. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent between 2,000 and 10,000 are required to have secondary treatment, but Italy has extended this requirement to smaller plants like this one to protect sensitive water bodies. The treated effluent is discharged into local waterways that eventually drain into the Volturno River basin, which flows into the Tyrrhenian Sea. The Volturno River is the longest river in southern Italy and supports diverse aquatic ecosystems. The plant plays a key role in protecting the water quality of the Volturno basin and the downstream coastal environment from untreated sewage pollution.

The plant discharges into the Volturno River basin, which flows into the Tyrrhenian Sea near the Gulf of Gaeta. The Volturno River supports a variety of fish species and provides habitat for migratory birds. The downstream coastal area includes sandy beaches and marine ecosystems that benefit from reduced nutrient and pathogen loads due to the plant's secondary treatment. Protecting this watershed is important for both ecological health and recreational use.