Ockero avloppsreningsverk Pinan - Öckerö Wastewater Treatment Plant, Sweden

Ockero avloppsreningsverk Pinan is a municipal wastewater treatment plant located on the island of Öckerö in Västra Götaland County, Sweden. It serves a population of about 13,912 residents in the Öckerö municipality, which comprises several islands in the Gothenburg archipelago. The plant is situated in a coastal setting, less than 50 kilometers from the open sea. As a Swedish plant serving a medium-sized agglomeration, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for discharges into coastal waters. Sweden's implementation of the directive also mandates nutrient removal for plants in sensitive areas, which includes the Kattegat and Baltic Sea regions. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the local population's wastewater. The treated effluent from Ockero avloppsreningsverk Pinan is discharged into the surrounding marine environment of the Kattegat, a sea area connecting the Baltic Sea to the North Sea. This region supports diverse marine life, including fish stocks and seabird populations, and is ecologically sensitive to eutrophication from nutrient inputs. The plant plays a key role in protecting the local coastal waters and the broader marine ecosystem.

The plant discharges into the Kattegat, a sea area between Sweden and Denmark that connects the Baltic Sea to the North Sea. This marine environment supports important fisheries and migratory bird populations. The Kattegat is classified as a sensitive area under the EU Urban Waste Water Treatment Directive due to eutrophication risks, making nutrient removal critical for protecting water quality and marine biodiversity.