DOUGLAS STW - Secondary Wastewater Treatment Plant in Douglas, Scotland

DOUGLAS STW is a municipal wastewater treatment plant located in Douglas, South Lanarkshire, Scotland. The facility serves a population of around 1,808 and operates under the regulatory framework of the United Kingdom, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for water quality standards. The plant provides secondary treatment, a standard level for agglomerations of this size under the Directive. It has a designed capacity of 3,500 cubic meters per day and reports an average discharge volume of approximately 402.52 cubic meters per day, indicating operational capacity well within design limits. The treated effluent is discharged into the local catchment, which ultimately drains into the River Clyde and then the Firth of Clyde. This water body supports diverse aquatic life and is important for regional biodiversity. The plant plays a key role in protecting water quality in the area.

The plant discharges into the Douglas Water, a tributary of the River Clyde, which flows into the Firth of Clyde on Scotland's west coast. The Firth of Clyde is a large sea inlet that supports important fisheries and marine habitats. The plant's secondary treatment helps reduce organic pollution and protect downstream ecosystems, including migratory fish species such as Atlantic salmon.