Overview
MARSLET wastewater treatment plant in Mårslet, Denmark, served 4,208 people with advanced treatment before closing. It discharged 833.75 m³/day and had a designed capacity of 5,404 m³/day.
MARSLET is a former wastewater treatment plant located in Mårslet, Aarhus Kommune, Region Midtjylland, Denmark. It served a population of 4,208 and was designed with a capacity of 5,404 m³/day, though it discharged an average of 833.75 m³/day. The plant is now closed, but its infrastructure remains part of the region's wastewater history. As a Danish plant, it operated under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for discharges into sensitive areas. Denmark applies stringent national standards, often exceeding EU minimums, particularly for nutrient removal to protect the Baltic Sea. The plant's advanced treatment level indicates it likely included nitrogen and phosphorus removal. The plant's discharge ultimately drains into the Baltic Sea via the Aarhus Bay catchment. The region's coastal waters are sensitive to eutrophication, making advanced treatment critical for protecting marine ecosystems. The plant's closure may reflect consolidation into larger regional facilities to improve efficiency and environmental outcomes.
Environmental context
The plant's discharge flows into the Aarhus Bay, part of the Kattegat strait, which connects to the Baltic Sea. This coastal area is ecologically sensitive, supporting diverse marine life and experiencing seasonal algal blooms driven by nutrient inputs. Advanced treatment at MARSLET helped reduce nutrient loads to these waters, mitigating eutrophication risks.
Frequently asked questions
MARSLET is located on Bedervej in Neder Mårslet, Mårslet, Aarhus Kommune, Region Midtjylland, Denmark.
The plant served a population of 4,208 people.
The plant discharged treated wastewater into the local catchment that drains to Aarhus Bay and ultimately the Baltic Sea. It had an average discharge volume of 833.75 m³ per day.
MARSLET provided advanced treatment, which typically includes biological nutrient removal for nitrogen and phosphorus, meeting stringent Danish standards under the EU Urban Waste Water Treatment Directive.
Coastal discharges in Denmark affect the Baltic Sea, which is sensitive to eutrophication. Advanced treatment reduces nutrient loads, helping to prevent algal blooms and protect marine ecosystems.
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