Effects of Water Depth on Algae Control in Stratified Reservoirs Using<i> In Situ</i> Water-Lifting Aeration Technology

Abstract

Flow outside the water-lifting aerator was simulated with FLUENT software, and the effects of water depth on the in-situ algal growth control using water-lifting aeration technology was numerically analyzed. Under stable state of flow outside the water-lifting aerator, the clockwise flow near the inlet and counter-clockwise flow in other domains coexisted, flow velocity decreased as the distance from the water-lifting aerator increased. When the water depth was increased from 50 m to 110 m, the radius of the core algal growth control zone increased from 60 m to 175 m, and the ratio of the algal growth control zone to the whole flow domain increased from 12.5% to 30.6%. The proper design intervals of water-lifting aerators in reservoirs were proposed as 1.2-1.6 times of water depth.