Overview
ONZAIN is an advanced wastewater treatment plant in Veuzain-sur-Loire, France, serving 2,803 people. It discharges 500.05 m³/day of treated water, with a designed capacity of 5,900 m³/day.
ONZAIN is an advanced wastewater treatment plant located in Veuzain-sur-Loire, in the Centre-Val de Loire region of France. The plant serves a population of approximately 2,803 people, reflecting its role as a municipal facility for the local community. The plant employs advanced treatment processes, ensuring high-quality effluent. With a designed capacity of 5,900 m³/day and an actual discharge volume of 500.05 m³/day, the plant operates well below its capacity, indicating room for future growth. As a French facility, it operates under the national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on population size and receiving water sensitivity. The treated wastewater is discharged into the local watershed, which ultimately drains into the Loire River, one of France's major rivers. The Loire River supports diverse aquatic ecosystems and is an important ecological corridor. The plant's advanced treatment helps protect water quality in this sensitive river basin.
Environmental context
The plant discharges into the Loire River basin, which flows through the Centre-Val de Loire region and eventually reaches the Atlantic Ocean. The Loire River is known for its rich biodiversity, including migratory fish species such as salmon and eels. Advanced treatment at this plant helps minimize nutrient and pollutant loads, supporting the ecological health of the river and its downstream estuary.
Frequently asked questions
The ONZAIN plant is located in Veuzain-sur-Loire, in the Loir-et-Cher department of the Centre-Val de Loire region, France.
The plant serves a population of approximately 2,803 people.
The treated wastewater is discharged into the local water system, which flows into the Loire River basin.
The plant provides advanced treatment, which goes beyond secondary treatment to remove nutrients and other pollutants, ensuring high effluent quality.
As a French plant serving fewer than 10,000 people, it operates under national regulations implementing the EU Urban Waste Water Treatment Directive, which requires appropriate treatment to protect receiving waters.
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