BAPAUME ZI SE Wastewater Treatment Plant, Bapaume, Hauts-de-France

BAPAUME ZI SE is an advanced wastewater treatment plant located in the industrial zone of Bapaume, in the Pas-de-Calais department of Hauts-de-France, France. The plant serves a population of about 3,817, placing it in the small agglomeration category under French regulations. As an advanced treatment facility, it goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants discharging into sensitive areas. The plant has a designed capacity of 4,500 m³/day and currently treats an average daily flow of 680.95 m³, indicating significant spare capacity. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). The treated effluent is discharged into local watercourses that eventually flow into the Scheldt river basin, which drains into the North Sea. The plant plays a key role in protecting the region's water quality, particularly given the agricultural and industrial activities in the area.

The plant discharges into the local watershed that is part of the Scheldt river basin, which flows through northern France and Belgium before reaching the North Sea. This basin supports diverse aquatic life and is an important ecological corridor. The advanced treatment helps reduce nutrient loading, which is critical for preventing eutrophication in downstream water bodies and the coastal marine environment.