EJEKTORLUFTNING AV JÄRNHALTIGT GRUNDVATTEN Del 1. Teori och Karaktärisering / Ejector aeration of iron containing ground water Part 1. Theory and laboratory evaluation
The purpose of ground water aeration is mainly to remove unwanted gases and impurities as well as improve the oxidation of iron and manganese. A commercial ejector aerator was characterized in laboratory and field and the performance was compared in field studies with other aeration methods used in full scale in water-works. This evaluation was made by re-aeration of a stationary water volume. The results from the laboratory tests showed that the overall oxygen transfer efficiency decreases with increasing water flow, while the total oxygenation increases with flow. An increased flow will also increase the energy consumption. A significant aeration efficiency improvement will be obtained if the submergence depth is increased. This depth has no major effect on the pressure drop, which means that the submergence should be kept as deep as possible to achieve higher cost efficiency for the oxygenation.