BLYTH STW - Blyth, Northumberland Wastewater Treatment Plant

BLYTH STW is a municipal wastewater treatment plant located in Blyth, Northumberland, in the North East of England. It serves a population of around 37,902, classifying it as a medium-sized agglomeration under UK and EU regulatory frameworks. The plant is situated near the coast, with its treated effluent ultimately reaching the North Sea. As a UK wastewater treatment facility, BLYTH STW operates under the Urban Waste Water Treatment (England and Wales) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, secondary treatment is typically required, with additional nutrient removal if discharging into sensitive areas. The plant's receiving water body is the River Blyth, which flows into the North Sea at Blyth Harbour. The North Sea is a productive marine ecosystem supporting fisheries, seabird colonies, and marine mammals. The plant's discharge contributes to the overall water quality in the estuary and coastal zone, which is monitored under the Water Framework Directive to ensure ecological and chemical status targets are met.

BLYTH STW discharges treated effluent into the River Blyth, which flows approximately 10 kilometers eastward to the North Sea at Blyth Harbour. The North Sea is a semi-enclosed continental shelf sea with significant ecological importance, supporting commercial fisheries, seabird populations, and marine mammals such as seals and porpoises. The estuary and coastal waters are subject to nutrient enrichment pressures from agricultural runoff and wastewater discharges, making nutrient removal a key consideration for maintaining good ecological status under the Water Framework Directive.