HADDENHAM STW - Secondary Wastewater Treatment in Haddenham, East Cambridgeshire

HADDENHAM STW is a wastewater treatment works located in the village of Haddenham, within the East Cambridgeshire district of Cambridgeshire, England. The plant serves a population of approximately 2,994 people and is part of the region's municipal wastewater infrastructure. It is situated in a rural fenland area, reflecting the agricultural character of the surrounding landscape. The plant provides secondary treatment, which is the standard biological treatment stage required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological oxidation and settlement, ensuring that organic pollutants and suspended solids are substantially reduced before discharge. The plant's designed capacity is 3,052 m³/day, and it currently treats an average daily flow of 666.57 m³/day, indicating it operates well below its maximum capacity. 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 nature conservation 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 from nutrient pollution and other contaminants.

The plant discharges into the River Great Ouse catchment, a lowland river system that flows through the Cambridgeshire Fens to the Wash estuary. The Wash is a large, ecologically important embayment that supports diverse bird populations, salt marshes, and intertidal habitats. Nutrient inputs from wastewater treatment can contribute to eutrophication in such sensitive coastal waters, making effective treatment essential for maintaining the ecological balance of the downstream environment.