LE BOLA Wastewater Treatment Plant, Pepinster, Liège, Belgium

LE BOLA is a municipal wastewater treatment plant located in Pepinster, within the Liège province of Belgium. It serves a population of 1,653, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated in the Walloon region, an area characterized by rolling hills and river valleys. The plant provides secondary treatment, which is the minimum standard required by the EU UWWTD for freshwater discharges from agglomerations of this size. With a designed capacity of 2,070 cubic meters per day and an average daily flow of 295.47 cubic meters, the plant operates well below its capacity, indicating ample headroom for future growth. Secondary treatment typically involves biological oxidation and sedimentation. The treated effluent from LE BOLA is discharged into a local watercourse that ultimately drains into the Vesdre River, a tributary of the Ourthe, which flows into the Meuse River. The Meuse then continues through Belgium and the Netherlands before reaching the North Sea. This plant plays a key role in protecting the Vesdre and downstream aquatic ecosystems from untreated wastewater.

LE BOLA discharges into a local stream that feeds the Vesdre River, a tributary of the Ourthe, which joins the Meuse River. The Meuse flows through Belgium and the Netherlands into the North Sea. The Vesdre watershed supports diverse aquatic life and is important for regional biodiversity. The plant's secondary treatment helps reduce organic pollutants and protect downstream water quality in this sensitive river system.