Abstract
This pilot study investigated the effects of in situ formed manganese dioxide (in situ δMnO2), produced from KMnO4 reduction, on the removal efficiency for turbidity and particles and the run length of filters through this pilot-scale study. The sedimentation effluent showed an insignificant difference in turbidity but a remarkable decrease in particle concentration after dosing KMnO4. The residual particle concentration decreased from 1504units/mL to 359, 302, 164units/mL in the anthracite filter effluent and from 994units/mL to 219, 134, 99units/mL in the granular activated carbon (GAC) effluent at KMnO4 dosages of 0.2, 0.3, and 0.4mg/L respectively. However, this effect was achieved at the expense of a rapid increase of water head loss (WHL), and the average run length decreased from 70h to 54, 52, and 48h accordingly. After dosing KMnO4 at 0.2, 0.3, and 0.4mg/L, the contributive ratios of the uppermost 200mm layers on WHL increased from 68.5% to 81.9%, 76.0%, and 82.2%, respectively.
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