Sandarnas reningsverk - Advanced Wastewater Treatment in Timrå distrikt, Sweden

Sandarnas reningsverk is a municipal wastewater treatment plant located in Timrå distrikt, within Timrå kommun, Västernorrlands län, Sweden. The plant serves a population of 1,043, classifying it as a small agglomeration under Swedish and EU regulatory frameworks. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for smaller agglomerations. With a designed capacity of 2,500 cubic meters per day and a current discharge volume of 163.73 cubic meters per day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the Baltic Sea via the nearby coast. The plant's location within 10 km of the coast means its discharge contributes to the nutrient load in the Baltic Sea, a sensitive marine environment subject to eutrophication concerns. The advanced treatment helps reduce this impact.

Sandarnas reningsverk discharges treated wastewater into the local water system, which flows into the Baltic Sea via the coastal waters of Västernorrland. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it highly sensitive to nutrient pollution. Advanced treatment at this plant helps reduce the input of nitrogen and phosphorus, supporting efforts to combat eutrophication and protect aquatic ecosystems in the region.