KOS 2 Wastewater Treatment Plant, Budy Zaklasztorne, Poland

KOS 2 is a wastewater treatment plant located in Budy Zaklasztorne, a village in the Mazowieckie Voivodeship of Poland. The plant served a small population of 427 people and is now closed. It operated as a secondary treatment facility, which is the standard level required under Polish and EU regulations for small agglomerations. As a secondary treatment plant, KOS 2 provided biological treatment to reduce organic matter and suspended solids before discharge. The plant had a designed capacity of 759 m³/day, with an actual discharge volume of 60.88 m³/day, indicating it operated well below capacity. Under the EU Urban Waste Water Treatment Directive, secondary treatment is mandatory for all inland agglomerations above 2,000 population equivalent, but smaller plants like KOS 2 are also expected to meet secondary standards. The treated effluent from KOS 2 was discharged into local surface waters, likely a small stream or river within the Vistula River basin. The Vistula flows north through Poland into the Baltic Sea, supporting diverse aquatic ecosystems. The plant's closure means that wastewater from this area is now managed by other facilities, ensuring continued protection of local water quality.

The plant discharged into a local watercourse within the Vistula River basin, which drains into the Baltic Sea. The Vistula is Poland's largest river system, supporting diverse aquatic life and providing water for agriculture and industry. The surrounding area is rural, with forests and farmland, making protection of surface waters important for both ecological health and human use.