Overview
TP 445 of Lohjan kt is an advanced wastewater treatment plant in Lohja, Uusimaa, Finland, serving approximately 6,000 people. It discharges treated water into the local watershed, contributing to the protection of the Baltic Sea.
TP 445 of Lohjan kt is an advanced wastewater treatment facility located in Lohja, within the Uusimaa region of southern Finland. The plant serves a population of about 6,000 residents, making it a medium-sized agglomeration under Finnish and EU classifications. Its location near the coast places it within a sensitive environmental zone. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This level of treatment is particularly important in areas that discharge into sensitive waters, such as the Baltic Sea, where nutrient removal helps prevent eutrophication. The plant operates under Finland's national implementation of EU water legislation, ensuring compliance with stringent discharge limits. The treated effluent from TP 445 of Lohjan kt ultimately reaches the Baltic Sea via local rivers and the Gulf of Finland. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it highly vulnerable to nutrient pollution. By providing advanced treatment, the plant plays a key role in reducing the load of nitrogen and phosphorus entering this ecologically sensitive marine environment, supporting the health of aquatic ecosystems and biodiversity.
Environmental context
The plant discharges into the local watershed that drains into the Gulf of Finland, part of the Baltic Sea. The Baltic Sea is a brackish water body with unique ecological characteristics, including low salinity and limited tidal exchange, making it susceptible to eutrophication from nutrient inputs. Advanced treatment at this plant helps mitigate the impact on downstream aquatic life and supports the recovery of coastal habitats.
Frequently asked questions
TP 445 of Lohjan kt is located in Lohja, Uusimaa, Finland, near the southern coast of the country.
The plant serves approximately 6,000 people, classifying it as a medium-sized agglomeration under EU definitions.
The treated wastewater is discharged into the local watershed, which flows into the Gulf of Finland and ultimately the Baltic Sea.
The plant provides advanced treatment, which includes nutrient removal to reduce nitrogen and phosphorus loads, exceeding the EU Urban Waste Water Treatment Directive's secondary treatment requirement.
The plant operates under Finland's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on population size and receiving water sensitivity.
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