ABERGAVENNY STW - Secondary Wastewater Treatment Plant in Glangrwyney, Wales

ABERGAVENNY STW (Sewage Treatment Works) is located in Glangrwyney, a village in Powys, Wales, United Kingdom. The plant serves a population of around 3,182 people and is situated inland, more than 10 km from the coast. It operates under the regulatory framework of the UK, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) through national legislation. The plant provides secondary treatment, a standard level required for inland freshwater discharges under the Directive. With a designed capacity of 3,319 cubic meters per day and an actual discharge volume of 708.42 cubic meters per day, the plant operates well below its capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse, likely a tributary of the River Usk, which flows into the Severn Estuary and then the Bristol Channel. The River Usk is a designated Site of Special Scientific Interest (SSSI) and supports diverse aquatic life, including salmon and otter populations. The plant's discharge contributes to maintaining water quality in this ecologically sensitive catchment.

The plant discharges into a local watercourse that drains into the River Usk, a major river in South Wales. The Usk flows south through the Brecon Beacons National Park and into the Severn Estuary, a large tidal estuary that empties into the Bristol Channel. The River Usk supports a diverse ecosystem, including Atlantic salmon, sea trout, and European otter, and is designated as a Special Area of Conservation (SAC) for its habitats. The plant's secondary treatment helps protect these downstream environments from nutrient pollution and organic loading.