| In this paper, experimental studies for obtaining turbidity removal efficiencies by changing the outlet weir loading in the sedimentation basin are conducted. The experiments are conducted through the outlet weir loading of 178, 290, 368, 393, 445, 480㎥day/m in the real water treatment plant having the capacity of 110,000㎥/day. To prevent the problem of incorrect water distribution between the sediment basins, only one sediment basin was used during the experimental period of September 13, 1997 to September 24, 1997. The turbidity removal efficiencies by changing the outlet weir loading in the sedimentation basin are obtained through the comparison of the turbidities between the inflow before the rapid mixing basin and the outflow after the outlet weir. The turbidity removal efficiencies by changing the outlet weir loading are plotted in the figure and the optimum regression line is obtained through the least square method. The line is indicated with the equation of y=-0.07076x+107.23562, where y is the turbidity removal efficiency in % and x is the weir loading in ㎥/day/m. As shown in the figure, the turbidity removal efficiency of 90% in the sedimentation basin is indicated in the outlet weir loading of 240㎥/day/m and the turbidity removal efficiency of 85% in the sedimentation basin is indicated in the outlet weir loading of 315㎥/day/m. Those values are less than the weir loadings of 350∼400㎥/day/m which are suggested as the standard weir loading in the water supply design standard. |
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