Sandholmen avr Wastewater Treatment Plant, Maran, Sweden

Sandholmen avr is a wastewater treatment plant located in Maran, within the Piteå municipality of Norrbotten County, Sweden. The facility serves a population of approximately 34,000 people, placing it in the medium agglomeration category under EU classification. As a Swedish plant, Sandholmen avr operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating a facility capable of handling the local wastewater load. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Bothnian Bay of the Baltic Sea. This coastal region supports diverse aquatic life and is an important area for fisheries and marine ecosystems. The plant's location within 50 km of the coast underscores the need for effective treatment to protect the sensitive Baltic Sea environment.

Sandholmen avr discharges into the local watershed that flows into the Bothnian Bay, part of the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. The plant's location in northern Sweden means it operates in a cold climate, which can affect treatment efficiency. The downstream environment supports diverse aquatic life, including fish species such as herring and salmon, and is an important migratory corridor for birds.