Overview
COLCHESTER STW serves approximately 123,155 people in Colchester, England. The plant operates under the UK's implementation of the EU Urban Waste Water Treatment Directive, ensuring appropriate treatment for its population tier.
COLCHESTER STW is a wastewater treatment plant located in Colchester, Essex, England, serving a population of around 123,155. Situated near the River Colne, the plant is part of the region's critical water infrastructure, managed under the UK's regulatory framework. As a facility serving over 100,000 people, COLCHESTER STW is classified as a large agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment as a minimum. The plant's designed capacity is 1.00 (likely in megaliters per day or similar unit), indicating it is sized to handle the wastewater load from this population. Treatment processes are expected to meet stringent standards for biological oxygen demand and suspended solids. The treated effluent is discharged into the River Colne, which flows into the Colne Estuary and then into the North Sea. This coastal discharge point is within 50 km of the coast, making the plant subject to additional environmental considerations to protect marine ecosystems. The plant plays a vital role in safeguarding the water quality of the Colne Estuary, a site of ecological importance supporting diverse aquatic life and migratory birds.
Environmental context
COLCHESTER STW discharges treated wastewater into the River Colne, which flows through Colchester and into the Colne Estuary, eventually reaching the North Sea. The estuary is an ecologically sensitive area that supports a variety of bird species and marine life, making effective treatment essential to prevent nutrient enrichment and protect downstream habitats.
Frequently asked questions
COLCHESTER STW is located in Colchester, Essex, England, near the River Colne.
COLCHESTER STW serves approximately 123,155 people, classifying it as a large agglomeration under the EU Urban Waste Water Treatment Directive.
Treated wastewater from COLCHESTER STW is discharged into the River Colne, which flows into the Colne Estuary and then into the North Sea.
As a UK plant serving over 100,000 people, COLCHESTER STW operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment and, where necessary, more advanced treatment for sensitive areas.
For a plant of this scale in the UK, secondary treatment is standard, with tertiary treatment often required for nutrient removal in sensitive catchments like the Colne Estuary.
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