Mariager CR Wastewater Treatment Plant, Mariager, Denmark

Mariager CR is an advanced wastewater treatment plant located in Mariager, a town in the Mariagerfjord Kommune of Region Nordjylland, Denmark. The plant serves a population of about 4,024 and has a designed capacity of 5,092 m³/day, with a current discharge volume of 797.29 m³/day. As an advanced treatment facility, Mariager CR provides tertiary-level treatment, which includes nutrient removal to protect sensitive receiving waters. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), Denmark requires advanced treatment for agglomerations discharging into sensitive areas, and this plant meets those standards. The treated effluent from Mariager CR is discharged into the Mariager Fjord, a long, narrow inlet of the Kattegat sea. The fjord supports diverse marine life and is an important ecological area. The plant's advanced treatment helps maintain water quality in this sensitive coastal environment.

Mariager CR discharges into Mariager Fjord, which flows into the Kattegat and ultimately the North Sea. The fjord is a nutrient-sensitive water body that supports diverse aquatic life, including fish and bird populations. Advanced treatment at the plant reduces nitrogen and phosphorus loads, helping to prevent eutrophication in the downstream marine environment.