Overview
TP 537 of Nastolan kk is a municipal wastewater treatment plant serving 24,000 people in Lahti, Finland. It operates under Finland's national implementation of the EU Urban Waste Water Treatment Directive.
TP 537 of Nastolan kk is a municipal wastewater treatment plant located in the Nastola district of Lahti, in the Päijät-Häme region of southern Finland. The plant serves a population of approximately 24,000 residents, placing it in the medium agglomeration category under EU classification. Its location in the boreal climate zone influences operational considerations, including seasonal flow variations and temperature effects on biological treatment processes. As a Finnish wastewater facility, TP 537 operates under the national implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, the directive requires secondary treatment as a minimum standard. Finland's regulatory framework also mandates nutrient removal in sensitive areas, which includes many inland water bodies. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the community's wastewater flows. The plant discharges treated effluent into the local watershed, which ultimately drains into the Gulf of Finland via the Kymijoki river system. This river basin is ecologically significant, supporting diverse aquatic life and serving as a migratory corridor for fish species. The receiving waters are sensitive to nutrient loading, making effective treatment crucial for maintaining water quality in downstream lakes and the Baltic Sea.
Environmental context
TP 537 of Nastolan kk discharges into the local watershed that feeds into the Kymijoki river system, one of Finland's major rivers flowing into the Gulf of Finland. The Kymijoki basin supports diverse aquatic ecosystems, including salmonid fish populations and extensive riparian habitats. Downstream, the Gulf of Finland is a brackish water body sensitive to eutrophication from nutrient inputs. Effective wastewater treatment at this plant helps protect these waters from excessive nutrient loading, supporting the ecological health of the Baltic Sea region.
Frequently asked questions
TP 537 of Nastolan kk is located in the Nastola district of Lahti, in the Päijät-Häme region of southern Finland. Its address is on Lemuntie in Veljeskylä, Nastola.
The plant serves approximately 24,000 residents, classifying it as a medium-sized agglomeration under EU wastewater treatment regulations.
The treated effluent is discharged into the local watershed, which flows into the Kymijoki river system and ultimately reaches the Gulf of Finland.
The plant operates under Finland's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size and may require nutrient removal in sensitive areas.
For medium-sized agglomerations in Finland, secondary treatment with nutrient removal is standard, especially in inland areas where receiving waters are sensitive to eutrophication. Plants often use activated sludge processes or biological filters.
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