Debenham STW - Secondary Wastewater Treatment in Mid Suffolk, England

Debenham STW (Sewage Treatment Works) is located on Thorpe Lane in Mid Suffolk, Suffolk, England. The plant serves a population of approximately 2,138 and has a designed capacity of 3,000 cubic meters per day, with an average discharge volume of 475.99 cubic meters per day. It provides secondary treatment, which is the standard biological treatment stage required for inland plants under UK and EU regulations. As a secondary treatment facility, Debenham STW employs biological processes to break down organic matter before discharging treated effluent. The plant's capacity utilization is low relative to its design, indicating headroom for future growth. It operates under the UK's environmental permitting regime, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) standards, ensuring compliance with discharge quality limits. The treated effluent from Debenham STW is discharged into local rivers that drain into the North Sea via the Suffolk river system. The plant plays a key role in protecting the water quality of the Deben River catchment, which supports diverse aquatic life and is used for recreation. Its location inland, more than 10 km from the coast, reduces direct marine impact.

Debenham STW discharges into the River Deben catchment, which flows southeast to the North Sea at Felixstowe. The river supports a variety of fish species and is an important habitat for waterfowl. The plant's secondary treatment helps maintain nutrient levels and oxygen balance in the river, protecting downstream ecosystems and recreational uses such as fishing and boating.