HORDEN AND PETERLEE STW - Wastewater Treatment Plant Serving Blackhall Colliery, County Durham

HORDEN AND PETERLEE STW is a wastewater treatment works located in Blackhall Colliery, County Durham, in the North East of England. It serves a population of around 97,000, classifying it as a large agglomeration under UK and EU regulations. The facility is situated near the coast, with treated effluent ultimately reaching the North Sea. As a large treatment works, the plant is expected to provide secondary treatment as a minimum under the Urban Waste Water Treatment Directive (91/271/EEC). The UK Environment Agency regulates discharges through permits under the Environmental Permitting Regulations. Plants of this scale typically incorporate biological treatment stages to meet stringent nutrient and oxygen demand standards. The receiving environment includes local streams that drain into the North Sea. The coastal waters in this region support diverse marine life, including fish populations and seabird colonies. Effective treatment is essential to protect water quality and the ecological health of the North Sea, which is a vital resource for fisheries and recreation.

The plant discharges into local watercourses that flow into the North Sea, a productive marine ecosystem supporting commercial fisheries and migratory bird populations. The coastal waters near County Durham are influenced by tidal currents and receive inputs from multiple rivers, making nutrient management important to prevent eutrophication. The area is ecologically sensitive, with habitats that rely on good water quality.