Ecological wastewater handling on Christiansø - a small island in the Baltic

Christiansø and Frederiksø, two small rocky Danish islands, are inhabited by 100 residents. On top of this comes 1000 daily tourists during the summer period. Currently, the wastewater is discharges untreated into the Baltic sea. The bedrock underground, the distance to the mainland, the peaks in wastewater production and the relatively strict nature preservation regulations implies that conventional wastewater transport and treatment is expensive and not considered appropriate. Consequently, this project aimed at identifying alternative solutions based on source control and "green" treatment methods. A number of alternative systems solutions were drawn up and evaluated in a holistic manner.