Witchford STW - Secondary Wastewater Treatment in East Cambridgeshire, England

Witchford STW is a wastewater treatment plant located on Long Drove in Witchford, East Cambridgeshire, Cambridgeshire, England. It serves a population of approximately 2,092 people, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges to freshwater from agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant has a designed capacity of 2,092 population equivalent and treats an average daily flow of 465.75 cubic meters. The treated effluent is discharged into local watercourses that drain into the River Great Ouse system, which flows through the Cambridgeshire Fens and ultimately into The Wash, a large estuary and important ecological area on the east coast of England. The plant plays a key role in protecting the water quality of these sensitive lowland rivers and the downstream marine environment.

The plant discharges into the River Great Ouse catchment, which drains the low-lying Cambridgeshire Fens. The river flows northward into The Wash, a large estuary and designated Site of Special Scientific Interest that supports diverse birdlife and marine habitats. The region's flat terrain and intensive agriculture make nutrient management critical to prevent eutrophication in downstream waters.