Overview
TP 646 of Porvoon kt serves Porvoo, Finland, treating wastewater for approximately 45,000 residents. The plant operates under Finland's implementation of the EU Urban Waste Water Treatment Directive.
TP 646 of Porvoon kt is a municipal wastewater treatment plant located in Porvoo, in the Uusimaa region of southern Finland. The plant serves a population of approximately 45,000 people, placing it in the medium agglomeration category under EU classifications. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving between 10,000 and 100,000 population equivalent are required to provide secondary treatment, with tertiary treatment mandated if the receiving waters are designated as sensitive areas. Finland has extensive sensitive areas due to its numerous lakes and coastal Baltic Sea environment, so advanced treatment is commonly required. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Gulf of Finland, part of the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it highly sensitive to nutrient pollution. Effective wastewater treatment at plants like TP 646 is crucial for reducing eutrophication and protecting the marine ecosystem.
Environmental context
The plant discharges into the Porvoonjoki river basin, which flows into the Gulf of Finland, a sub-basin of the Baltic Sea. The Baltic Sea is one of the most eutrophied seas globally, with nutrient inputs from wastewater and agriculture driving algal blooms and oxygen depletion. The Gulf of Finland, in particular, experiences seasonal hypoxia, making advanced nutrient removal at treatment plants essential for ecological health.
Frequently asked questions
TP 646 of Porvoon kt is located in Porvoo, in the Uusimaa region of southern Finland, approximately 50 kilometers east of Helsinki.
The plant serves approximately 45,000 residents, classifying it as a medium-sized agglomeration under EU wastewater treatment regulations.
The treated effluent is discharged into the Porvoonjoki river, which flows into the Gulf of Finland and ultimately the Baltic Sea.
The plant operates under Finland's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size and tertiary treatment in sensitive areas like the Baltic Sea catchment.
In Finland, plants serving 45,000 people typically provide at least secondary biological treatment, with many also incorporating nutrient removal (tertiary treatment) to meet strict discharge limits for phosphorus and nitrogen, especially in areas draining to the Baltic Sea.
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