Modla Krolewska Wastewater Treatment Plant, Barczygłów, Poland

Modla Krolewska is a wastewater treatment plant located in Barczygłów, within the gmina Stare Miasto, powiat koniński, województwo wielkopolskie, Poland. The facility serves a population of 2,724 and operates with secondary treatment, which is the standard level required under Polish and EU regulations for smaller agglomerations. As a secondary treatment plant, Modla Krolewska employs biological processes to reduce organic matter and suspended solids. Its designed capacity is 9,733 m³/day, while the current discharge volume is 388.40 m³/day, indicating ample reserve capacity. The plant is part of Poland's wastewater infrastructure, which is regulated under the EU Urban Waste Water Treatment Directive (91/271/EEC), mandating secondary treatment for all agglomerations above 2,000 population equivalent. The treated effluent from Modla Krolewska is discharged into local watercourses that ultimately drain into the Warta River basin, a major tributary of the Oder River. The Oder flows into the Baltic Sea via the Szczecin Lagoon. The plant's operation helps protect the local watershed and downstream aquatic ecosystems from nutrient pollution and organic loading.

The plant discharges into the Warta River basin, which flows into the Oder River and eventually reaches the Baltic Sea through the Szczecin Lagoon. The region's watershed supports diverse aquatic life and is important for migratory fish species. Secondary treatment reduces organic pollutants and nutrients, helping to prevent eutrophication in downstream water bodies.