MELLING STW - Secondary Wastewater Treatment Plant in Waddicar, England

MELLING STW is a municipal wastewater treatment plant located in Waddicar, Melling, within the Sefton district of the Liverpool City Region, England. The facility serves a population of approximately 2,856 and operates under secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive for agglomerations of this size. The plant's designed capacity matches the population served, indicating a balanced infrastructure for the local community. As a secondary treatment plant, MELLING STW provides biological treatment to reduce organic matter and suspended solids before discharge. The plant is situated near the coast, within 10 km of the shoreline, which places it in a sensitive coastal zone. Under the EU Urban Waste Water Treatment Directive, such coastal discharges may require additional treatment if the receiving waters are designated as sensitive areas. The treated effluent from MELLING STW ultimately reaches the Irish Sea via local watercourses and the Mersey Estuary. The plant's location in the Liverpool City Region means it contributes to the protection of the Mersey Basin, an ecologically important area that supports diverse aquatic life and migratory bird populations. The proximity to the coast necessitates careful management to prevent nutrient enrichment and maintain water quality in the marine environment.

MELLING STW discharges treated wastewater into local watercourses that drain into the Mersey Estuary and then the Irish Sea. The Mersey Estuary is a major ecological feature, supporting diverse bird species and fish populations. The coastal location means the plant's discharge can influence nutrient levels and water quality in the marine environment, requiring compliance with sensitive area standards under the EU Urban Waste Water Treatment Directive.