FLESSELLES SE Wastewater Treatment Plant, Flesselles, Hauts-de-France

FLESSELLES SE is a wastewater treatment facility located in the commune of Flesselles, within the Somme department of the Hauts-de-France region in northern France. The plant serves a population of 1,165 and is designed to handle a capacity of 2,250 m³ per day, with an average discharge volume of 207.83 m³ per day. The plant employs advanced treatment processes, which go beyond the secondary treatment requirements mandated by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant operates under French national regulations that implement the directive, overseen by the local water agency (Agence de l'Eau Artois-Picardie). The treated effluent is discharged into the local watershed, which ultimately drains into the Somme River and then into the English Channel. The Somme River basin supports diverse aquatic life and is an important ecological corridor in the region. The plant's advanced treatment helps minimize nutrient loading and protects downstream water quality.

FLESSELLES SE discharges treated wastewater into the local catchment that feeds the Somme River, which flows westward into the English Channel. The Somme basin is a lowland river system with slow-moving waters, making it sensitive to nutrient enrichment. Advanced treatment at the plant reduces nitrogen and phosphorus loads, helping to prevent eutrophication in the river and its estuary, which supports diverse birdlife and fish populations.