Aarhus University Seal / Aarhus Universitets segl

Constructed wetlands

Denne side er under udvikling

Constructed wetlands (CWs), also known as treatment wetlands, are engineered systems designed and constructed to treat various types of polluted water. Different types of CWs have proven efficiency and applications from rural to urban and even industrial settings. The removal of the pollutants in CWs occurs as a result of complex interactions between the media, the vegetation and the microorganisms in the CW bed. The most attractive benefit of the CW technology is its “green” and ecofriendly way of treating wastewater with low operational costs and easy maintenance.

We study the complex physical, chemical, and biological processes occurring in various types of CW systems. Focus is on process intensification by e.g. implementation of water recirculation, intermittent forced aeration, integration of electroductive materials in the systems, and the development of specific media to enhance phosphorus removal and phosphorus recovery from wastewater.

In various international projects, different types of CW systems are being developed and built across the world (Denmark, Spain, Italy, Mexico, Peru, India, China) for the treatment of industrial wastewater, municipal wastewater, stormwater and sludge.  Water reuse as well as nutrient and energy recycling in CW systems is currently in focus in line with other ecosystem services that the systems provide. Furthermore, we also test the CWs for their capacity to tackle new challenges, such as the removal of emerging organic micro-pollutants, e.g. pharmaceuticals, pesticides and personal care products.

We are part of the the AU Centre for Water Technology  

Contact: Carlos A. Arias and Hans Brix


  • A new generation of Microbial Electrochemical Wetland for effective decentralized wastewater treatment (IMETland) www.imetland.eu
  • Innovative Eco-Technologies for Resource Recovery from Wastewater www.incover-project.eu