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KARLSTAD ENERGI We installed four Airturbo™ for their leachate in Djupdalen 2005, since the installation of the aerators SWECO has been taken samples every month. The oxygen level during the test period was between 5,4 and 9,2 mg/l. Flowrate between 2049-23640 m3/month, ammoniacal 49-130 mg/l. The results show that the aerators keeps an satisfying oxygen level despite a very reduced water. Calculation of the oxidation of BOD7 and oxidation to nitrate shows that the three aerators have produced at least 160 gO2/h and aerator.