Willow vegetation filters
Willow vegetation filters are used for purification of wastewater.
Wastewater is pre-treated in precipitation tanks and then pumped to willow vegetation filters.
In willow vegetation filters, wastewater is absorbed/purified by willow trees and evaporated i.a. leaves of the trees. Willow vegetation filters should be placed freely to increase sun and wind effects.
Wastewater is not led away from the filters.
Tunetanken willow vegetation filters meet requirement of all purification classes: of SOP (increased requirement for reduction of organic material as well as nitrification and reduction of phosphorous), SO (increased requirement for reduction of organic material), OP (reduction of organic material and reduction of phosphorous) and O (reduction of organic material).