Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes

Photodegradation of I-THMs including CHCl2I and CHI3 by the UV/H2O2 system was investigated in this study. CHCl2I and CHI3 react rapidly with hydroxyl radical (radical dotOH) produced by the UV/H2O2 system, with second-order rate constants of 8.0 × 109 and 8.9 × 109 M−1 s−1, respectively. A fraction...

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Main Authors: Zhang, Lifeng, Yue, Junqi, Lim, Teik-Thye, Webster, Richard David, Xiao, Yongjun
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/106198
http://hdl.handle.net/10220/26370
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1061982020-09-26T22:01:29Z Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes Zhang, Lifeng Yue, Junqi Lim, Teik-Thye Webster, Richard David Xiao, Yongjun School of Civil and Environmental Engineering School of Physical and Mathematical Sciences Nanyang Environment and Water Research Institute DRNTU::Engineering::Environmental engineering::Water treatment Photodegradation of I-THMs including CHCl2I and CHI3 by the UV/H2O2 system was investigated in this study. CHCl2I and CHI3 react rapidly with hydroxyl radical (radical dotOH) produced by the UV/H2O2 system, with second-order rate constants of 8.0 × 109 and 8.9 × 109 M−1 s−1, respectively. A fraction of CHCl2I could be completely mineralized within 15 min and the remaining fraction was mainly converted to formic acid (HCO2H). Cl− and I− were identified as the predominant end-products. No ClO3− was observed during the photodegradation process, while IO3− was detected but at less than 2% of the total liberated iodine species at the end of the reaction. The effects of pH, H2O2 dose, and matrix species such as humic acid (HA), HCO3−, SO42−, Cl−, NO3− on the photodegradation kinetics were evaluated. The steady-state kinetic model has been proven to successfully predict the destruction of CHCl2I and CHI3 by UV/H2O2 in different water matrices. On this basis, the kinetic model combined with electrical energy per order (EE/O) concept was applied to evaluate the efficiency of the photodegradation process and to optimize the H2O2 dose for different scenarios. The optimal H2O2 doses in deionized (DI) water, model natural water, and surface water are estimated at 5, 12, and 16 mg L−1, respectively, which correspond to the lowest total energy consumption (EE/Ototal) of 0.2, 0.31, and 0.45 kWhm−3order−1. Accepted version 2015-07-10T02:28:31Z 2019-12-06T22:06:15Z 2015-07-10T02:28:31Z 2019-12-06T22:06:15Z 2015 2015 Journal Article Xiao, Y., Zhang, L., Yue, J., Webster, R. D., & Lim, T.-T. (2015). Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes. Water Research, 75, 259-269. 0043-1354 https://hdl.handle.net/10356/106198 http://hdl.handle.net/10220/26370 10.1016/j.watres.2015.02.044 en Water Research 2015 Elsevier 32 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water treatment
spellingShingle DRNTU::Engineering::Environmental engineering::Water treatment
Zhang, Lifeng
Yue, Junqi
Lim, Teik-Thye
Webster, Richard David
Xiao, Yongjun
Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes
description Photodegradation of I-THMs including CHCl2I and CHI3 by the UV/H2O2 system was investigated in this study. CHCl2I and CHI3 react rapidly with hydroxyl radical (radical dotOH) produced by the UV/H2O2 system, with second-order rate constants of 8.0 × 109 and 8.9 × 109 M−1 s−1, respectively. A fraction of CHCl2I could be completely mineralized within 15 min and the remaining fraction was mainly converted to formic acid (HCO2H). Cl− and I− were identified as the predominant end-products. No ClO3− was observed during the photodegradation process, while IO3− was detected but at less than 2% of the total liberated iodine species at the end of the reaction. The effects of pH, H2O2 dose, and matrix species such as humic acid (HA), HCO3−, SO42−, Cl−, NO3− on the photodegradation kinetics were evaluated. The steady-state kinetic model has been proven to successfully predict the destruction of CHCl2I and CHI3 by UV/H2O2 in different water matrices. On this basis, the kinetic model combined with electrical energy per order (EE/O) concept was applied to evaluate the efficiency of the photodegradation process and to optimize the H2O2 dose for different scenarios. The optimal H2O2 doses in deionized (DI) water, model natural water, and surface water are estimated at 5, 12, and 16 mg L−1, respectively, which correspond to the lowest total energy consumption (EE/Ototal) of 0.2, 0.31, and 0.45 kWhm−3order−1.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Zhang, Lifeng
Yue, Junqi
Lim, Teik-Thye
Webster, Richard David
Xiao, Yongjun
format Article
author Zhang, Lifeng
Yue, Junqi
Lim, Teik-Thye
Webster, Richard David
Xiao, Yongjun
author_sort Zhang, Lifeng
title Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes
title_short Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes
title_full Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes
title_fullStr Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes
title_full_unstemmed Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes
title_sort kinetic modeling and energy efficiency of uv/h2o2 treatment of iodinated trihalomethanes
publishDate 2015
url https://hdl.handle.net/10356/106198
http://hdl.handle.net/10220/26370
_version_ 1681058647430397952