SÄSONGSLAGRING AV AVLOPPSVATTEN FÖR SKOGSBEVATTNING / Seasonal storage of wastewater for forest irrigation
Waste-water could be used for forest irrigation as a method for utilising the resources in the water. Forest irrigation systems are rare in Sweden; however, there are some examples in both the north and the south of the country. If irrigation is to be used as a whole-year system, storage of the wastewater due to the cold climate would be needed. The storage requirements are determined by surrounding factors such as wastewater flow and climate, and are, therefore, specific for each system.
During storage the characteristics of the wastewater will change due to physical, chemical, and biological processes. This is exemplified in the article by a case study performed at the forest irrigation system in Klöverträsk in the municipality of Luleå. During wintertime storage of wastewater, approximately 60% of both the phosphorus and nitrogen were reduced from the water column. The change in water characteristics will affect the magnitude of the irrigation area, as this is to some extent determined by the nutrient load