TREVAD Wastewater Treatment Plant, Viborg Municipality, Denmark

TREVAD is an advanced wastewater treatment plant located in Viborg Municipality, Region Midtjylland, Denmark. The facility serves a population equivalent of 1,244 and has a designed capacity of 3,000 cubic meters per day, with an average discharge volume of 549.65 cubic meters per day. As an advanced treatment plant, TREVAD goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for Danish plants operating under the EU Urban Waste Water Treatment Directive (91/271/EEC). Denmark has implemented stringent nutrient removal requirements to protect its sensitive coastal and inland waters, and plants of this scale are expected to meet high effluent standards. The treated effluent from TREVAD is discharged into the local water system, which ultimately drains into the Limfjord or the North Sea via the Skive Fjord system. The region's water bodies support diverse aquatic life and are important for recreation and fisheries. Advanced treatment helps minimize eutrophication risks in these downstream environments.

TREVAD discharges treated wastewater into the local catchment, which flows into the Skive Fjord and then the Limfjord, a shallow sound connecting to the North Sea. The Limfjord is an ecologically sensitive area that supports diverse marine life, including fish and bird populations. Advanced nutrient removal at TREVAD helps reduce the risk of algal blooms and oxygen depletion in these downstream waters.