title: Enhanced removal of dichloroacetonitrile from drinking water by the combination of solar-photocatalysis and ozonation.
abstract: In this study, the photocatalytic ozonation process using either UV lamps with a wavelength close to a solar wavelength (UVsolar) or natural solar light was established to study the effects of the major operating parameters on the removal of a toxic disinfection by-product (DBP), dichloroacetonitrile (DCAN), from drinking water. Based on the test results of a bench system, the UVsolar/TiO2/O3 process had the highest DCAN-removal rate among the advanced oxidation processes (AOPs). The optimal TiO2 and ozone doses were 1gL(-1) and 1.13gL(-1)h(-1), respectively, while room temperature (20°C) produced the highest rate constant in the kinetic tests. The kinetic rate constants linearly increased when the UVsolar intensity increased in the range 4.6-25Wm(-2); however, it increased less at intensities higher than 25Wm(-2). The test results of the outdoor system showed that the solar/TiO2/O3 process provided complete removal of DCAN that was two times faster and had about 4.6 times higher energy efficiency than with solar/TiO2. As a green oxidation technique, solar photocatalytic ozonation could be a good alternative for treating recalcitrant and toxic organic pollutants, because it has high oxidation potential and low energy consumption compared to conventional AOPs.
authors.affiliation: School of Civil, Environmental and Architectural Engineering, Korea University, 5 Anam-dong, Seoul 136-701, Republic of Korea.
authors.forename: Donghoon
authors.initials: D
authors.lastname: Shin
authors.forename: Min
authors.initials: M
authors.lastname: Jang
authors.forename: Mingcan
authors.initials: M
authors.lastname: Cui
authors.forename: Seungmin
authors.initials: S
authors.lastname: Na
authors.forename: Jeehyeong
authors.initials: J
authors.lastname: Khim
mesh_terms: D000097:Acetonitriles / Q000032:analysis / Q000737:chemistry*; D060766:Drinking Water; D007700:Kinetics; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D013472:Sunlight; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000097:Acetonitriles; D060766:Drinking Water; D014874:Water Pollutants, Chemical; D010126:Ozone; C051716:dichloroacetonitrile
keywords: Dichloroacetonitrile; Oxidation; Ozonation; Photocatalysis; Solar