Overview
TP 944 of Nummela is a municipal wastewater treatment plant serving approximately 17,800 people in Vihti, Uusimaa, Finland. The facility operates under Finland's implementation of the EU Urban Waste Water Treatment Directive.
TP 944 of Nummela is a municipal wastewater treatment plant located in Nummela, Vihti, in the Uusimaa region of southern Finland. The plant serves a population of around 17,800, placing it in the medium agglomeration category under EU regulations. It is situated inland, more than 50 kilometers from the coast, and its treated effluent is discharged into local water bodies that ultimately drain into the Gulf of Finland. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size are required to provide secondary treatment as a minimum. Finland has implemented this directive through national legislation, and plants like TP 944 of Nummela are subject to permit conditions set by regional authorities. Typical capacities for this population size range from 5,000 to 10,000 cubic meters per day. The plant's receiving water body is part of the Vihti river system, which flows into the Gulf of Finland via the Mustionjoki or Karjaanjoki watersheds. This coastal discharge zone supports diverse aquatic life and is an important area for migratory fish species. The plant's treatment performance is critical to maintaining water quality in these downstream environments, which are subject to both national and EU water quality standards.
Environmental context
TP 944 of Nummela discharges treated wastewater into local streams within the Vihti region, which are part of the Karjaanjoki or Mustionjoki river systems. These rivers flow southward into the Gulf of Finland, a brackish water body of the Baltic Sea. The downstream environment supports diverse aquatic life, including salmonid fish populations, and is ecologically sensitive to nutrient loading. The plant's operations help protect these waters from eutrophication, a key concern in the Baltic Sea catchment area.
Frequently asked questions
TP 944 of Nummela is located in Nummela, Vihti, in the Uusimaa region of southern Finland. The plant's address is Nummelan jätevedenpuhdistamo, 90, Pillistöntie, Sepänpiha, Höytiönummi, Nummela.
The plant serves approximately 17,800 people, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive.
The treated effluent is discharged into local streams in the Vihti region, which flow into the Gulf of Finland via the Karjaanjoki or Mustionjoki river systems.
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. Permits are issued by regional environmental authorities.
For medium-sized agglomerations in Finland, secondary treatment is standard, often including biological processes such as activated sludge. Some plants may also incorporate phosphorus removal to meet Baltic Sea protection targets.
Nearby plants