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Effect of Advanced Treatment Process for Residual Chlorine Decay and THM Formation in Water Distribution System  

Lee, Doo-Jin (Water & Wastewater Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Kim, Young-Il (Water & Wastewater Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Kim, Sung-Su (Water & Wastewater Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Lee, Kyung-Hyuk (Water & Wastewater Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Park, Hyun-A (Water & Wastewater Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
Publication Information
Abstract
According to increase of consumer's desire for clean tap water, advanced treatment processes include with membrane, ozone, and granular activated carbon(GAC) were introduced. In order to evaluate the effect of advanced treatment processes for residual chlorine decay and trihalomethane(THM) formation in water distribution system, dissolved organic matter(DOC) removal of each advanced treatment process was investigated. The residual chlorine decay and THM formation using bottle tests were also evaluated. $UV_{254}$ removal in all advanced treatment was better than DOC removal. Especially, DOC by ozone treated was removed as 4% in contrast with sand filtered water, but $UV_{254}$ was removed about 17%. This result might be due to convert from hydrophobic DOC to hydrophilic DOC by ozonation. Ozone/GAC process was most effective process for DOC removal. The residual chlorine decay constants in treated water by sand filtration, ozonation, GAC adsorption, and ozone/GAC processes were 0.0230, 0.0307, 0.0117 and 0.0098 $hr^{-1}$, respectively. The sand filtered water was produced 81.8 ${\mu}g/L$ of THM after 190 hours of reaction time, as the treated water by ozone, GAC, and Ozone/GAC was less produced 6.0, 26.2, 30.3% in contrast with sand filtered water, respectively. Consequently, the durability of residual chlorine and reduction of THM formation were improved by advanced treatment processes.
Keywords
Advanced Treatment Process; Water Distribution System; Dissolved Organic Carbon(DOC); Residual Chlorine; Trihalomethane(THM);
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