LOCMARIA GRAND CHAMP Collec Wastewater Treatment Plant, Botcalpir, Bretagne

LOCMARIA GRAND CHAMP Collec is an advanced wastewater treatment plant located in the hamlet of Collec, near Botcalpir, within the commune of Locmaria-Grand-Champ in the Morbihan department of Bretagne, France. The plant serves a population of 2,170 and has a designed capacity of 6,000 cubic meters per day, with an average discharge volume of 387.12 cubic meters per day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As a French facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for agglomerations of this size. For plants serving between 2,000 and 10,000 population equivalents, the directive mandates secondary treatment, but France often implements tertiary or advanced treatment in sensitive areas. The treated effluent is discharged into local watercourses that drain into the Gulf of Morbihan, a semi-enclosed marine inlet connected to the Bay of Biscay. The Gulf of Morbihan is an ecologically significant area supporting diverse marine life, including seagrass beds and migratory birds. The plant's advanced treatment helps protect this sensitive coastal ecosystem from nutrient pollution.

The plant discharges into small streams that flow into the Gulf of Morbihan, a shallow, semi-enclosed sea on the southern coast of Bretagne. The Gulf is a critical habitat for seagrass meadows, shellfish beds, and migratory waterbirds. Advanced treatment at the plant reduces nutrient loads, helping to prevent eutrophication in this ecologically sensitive marine environment. The Gulf ultimately connects to the Bay of Biscay and the Atlantic Ocean.