CRANWELL STW Wastewater Treatment Plant, North Kesteven, England

CRANWELL STW is a wastewater treatment plant located in North Kesteven, Lincolnshire, England. It serves a population of approximately 3,600 people, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant is situated inland, away from coastal areas, and operates as part of the regional wastewater infrastructure managed by local water authorities. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges 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 6,311 cubic meters per day and currently discharges an average of 800.82 cubic meters per day, indicating significant spare capacity. The treated effluent from CRANWELL STW is discharged into local watercourses that ultimately drain into the North Sea via the River Witham or other Lincolnshire rivers. The plant plays a key role in protecting the water quality of these rivers and the downstream marine environment, supporting aquatic life and reducing nutrient loads.

CRANWELL STW discharges into the River Witham catchment, which flows through Lincolnshire and empties into The Wash, a large estuary on the North Sea coast. The Wash is an ecologically important area supporting diverse bird populations and marine life. The plant's secondary treatment helps reduce organic pollution and nutrient inputs, contributing to the health of this sensitive downstream ecosystem.