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http://dx.doi.org/10.4491/KSEE.2017.39.5.246

Degradation of Microcystin-LR, Taste and Odor, and Natural Organic Matter by UV-LED Based Advanced Oxidation Processes in Synthetic and Natural Water Source  

Yang, Boram (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
Park, Jeong-Ann (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
Nam, Hye-Lim (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
Jung, Sung-Mok (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
Choi, Jae-Woo (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
Park, Hee-Deung (Department of Civil, Environmental and Architectural Engineering, Korea University)
Lee, Sang-Hyup (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.39, no.5, 2017 , pp. 246-254 More about this Journal
Abstract
Microcystin-LR (MC-LR) is one of most abundant microcystins, and is derived from blue-green algae bloom. Advanced oxidation processes (AOPs) are effective process when high concentrations of MC-LR are released into a drinking water treatment system from surface water. In particular, UV-based AOPs such as UV, $UV/H_2O_2$, $UV/O_3$ and $UV/TiO_2$ have been studied for the removal of MC-LR. In this study, UV-LED was applied for the degradation of MC-LR because UV lamps have demonstrated some weaknesses, such as frequent replacements; that generate mercury waste and high heat loss. Degradation efficiencies of the MC-LR (initial conc. = $100{\mu}g/L$) were 30% and 95.9% using LED-L (280 nm, $0.024mW/cm^2$) and LED-H (280 nm, $2.18mW/cm^2$), respectively. Aromatic compounds of natural organic matter changed to aliphatic compounds under the LED-H irradiation by LC-OCD analysis. For application to raw water, the Nak-dong River was sampled during summer when blue-green algae were heavy bloom in 2016. The concentration of extracellular and total MC-LR, geosmin and 2-MIB slightly decreased by increasing the LED-L irradiation; however, the removal of MC-LR by UV-LED (${\lambda}=280nm$) was insufficient. Thus, advanced UV-LED technology or the addition of oxidants with UV-LED is required to obtain better degradation efficiency of MC-LR.
Keywords
Blue-green Algae; Microcystin-LR; UV-LED; Advanced Oxidation Process; Taste and Odor Compounds; Natural Organic Matter;
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