Abstract
The objectives of this study were to characterize an algae polluted-lake water using conventional variables of Trophic State Index Korea (TSIko) and to evaluate the performances of granular activated carbon (GAC) adsorption and the filtration of membrane filter (MF) using stirred dead end filtration cell on pollutants removal (COD, T-N, T-P, chlorophyll-a (chl-a), secchi disc (SD), and dissolved organic matter(DOC)) in the algae-polluted-lake water. As a result, regression analyses of log transformed seasonal Chl-a against T-P and T-N showed that variation of the Chl-a was explained by the variation of T-P(r= 0.3887) but not by T-N(r=0.2721). Consequently, The data obtained from this study suggest that one of the ways controlling the eutrophication would be a reduction of phosphorus from the watershed. Applied filtration rates during this experiment were <4.0 m/h for GAC bed and 0.5 m<sup>3</sup>/m<sup>2</sup>.d for MF. Both GAC bed and GAC/MF system achieved more than 40% efficiency in removing geosmin and 2-methylisoborneol(2-MIB). The combined membrane process with GAC adsorption process was found to produce the highest quality finished water and could be proposed as one of the best available processes for removing geosmin. The increase of influent algae and DOC increased transmembrane pressure (TMP) of MF process. Membrane resistance of MF process coupled with GAC bed was lower than that MF process.
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