TP 317 of Korpilahden kk Wastewater Treatment Plant, Jyväskylä, Finland

TP 317 of Korpilahden kk is an advanced wastewater treatment facility located in the Korpilahti district of Jyväskylä, in the Keski-Suomi region of Finland. The plant serves a population of approximately 3,200 residents and operates under Finland's national water legislation, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). As an advanced treatment plant, it provides nutrient removal beyond secondary treatment, which is typical for sensitive areas like the Lake Päijänne watershed. The plant's advanced treatment process ensures high-quality effluent before discharge. The plant's discharge volume of 524.47 units indicates consistent operation. Under the EU directive, agglomerations of this size (3,200 PE) are required to have at least secondary treatment, but Finland often mandates advanced treatment for plants discharging into sensitive water bodies. The treated wastewater is discharged into the local water system, which flows into Lake Päijänne, one of Finland's largest lakes and a critical freshwater resource. Lake Päijänne drains via the Kymi River into the Gulf of Finland, part of the Baltic Sea. The plant's proximity to the lake underscores its role in protecting this ecologically important water body from nutrient pollution.

The plant discharges into the Lake Päijänne watershed, which is part of the Kymi River basin that ultimately drains into the Gulf of Finland and the Baltic Sea. Lake Päijänne is a large, ecologically sensitive lake that supports diverse aquatic life and serves as a drinking water source for the Helsinki region. The advanced treatment at this plant helps reduce nutrient loading, which is critical for preventing eutrophication in the Baltic Sea.