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In this study, the water budget in the treatment of high salinity landfill-leachate was estimated and the influence of evapotranspiration (ET) on treatment performance was investigated. The salinity of the inside of horizontal subsurface flow constructed wetland (HSF) of the raw leachate inflow was 15.0 ± 3.4 gCl/L which was in the level of the salinity of the survival limit of reed, and that of the double diluted leachate inflow was 9.3 ± 1.9 gCl/L. There were large differences in the vegetation between HSF of the raw leachate inflow and that of the double diluted leachate inflow. The dense vegetation bed of double diluted leachate inflow during the growing season (April-October) provided a high ET and a large water loss, which made great contributions to the reduction of the outflow load of COD and T-N. The HSF with die-back reeds in the non-growing season (November-March) provided a slight ET and a small water loss and made less of a contribution to pollutant removal compared to the HSF with dense vegetation bed during the growing season. However, the HSF with die-back reeds during the non-growing season exhibited higher removal performance than the unplanted HSF.

Evapotranspiration and Removal Performance in the Treatment of High Salinity Landfill-Leachate Using HSF