SAULZOIR Wastewater Treatment Plant, Saulzoir, Hauts-de-France

SAULZOIR is a wastewater treatment plant located in Saulzoir, a commune in the Nord department of Hauts-de-France, France. The plant serves a population of approximately 2,397 and has a designed capacity of 4,000 m³/day, with an average discharge volume of 427.62 m³/day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants in sensitive areas are required to implement tertiary treatment. As an advanced facility, SAULZOIR meets high standards for effluent quality, protecting the local water environment. The treated effluent is discharged into the local watershed, which ultimately drains into the Scheldt River basin. This region is part of the larger North Sea drainage system. The plant plays a key role in maintaining water quality in the area, supporting aquatic life and downstream ecosystems.

SAULZOIR discharges into the local water network that flows into the Scheldt River, which eventually reaches the North Sea. The Scheldt basin supports diverse aquatic habitats and is an important ecological corridor for fish and bird species. The plant's advanced treatment helps reduce nutrient loading, protecting downstream water quality and preventing eutrophication in the North Sea coastal zone.