TY - JOUR
T1 - Degradation of acesulfame in UV/monochloramine process
T2 - Kinetics, transformation pathways and toxicity assessment
AU - Chow, Chi Hang
AU - Law, Japhet Cheuk Fung
AU - Leung, Kelvin Sze-Yin
N1 - Funding Information:
The authors thank the Hong Kong Research Grants Council (HKBU 12302915 and 12331316 ) for their financial support. C. -H. Chow and J. C. –F. Law are supported by a postgraduate studentship offered by the University Grants Committee .
Funding Information:
The authors thank the Hong Kong Research Grants Council (HKBU 12302915 and 12331316) for their financial support. C. -H. Chow and J. C. ?F. Law are supported by a postgraduate studentship offered by the University Grants Committee.
Copyright © 2020 Elsevier B.V. All rights reserved.
PY - 2021/2/5
Y1 - 2021/2/5
N2 - UV/monochloramine (UV/NH2Cl) is an emerging advanced oxidation process that can generate various reactive species like reactive chlorine species (RCS) and hydroxyl radicals for micropollutant removal. This study investigated the potential toxicity of transformation products resulting from UV/NH2Cl treatment of acesulfame (ACE), as an example of micropollutant, found in worldwide aquatic environment. Compared with UV photolysis and chloramination, the UV/NH2Cl process more effectively degraded ACE. The transformation products of ACE treated with the UV/NH2Cl process were identified and characterized with high resolution mass spectrometry. The formation of chlorinated-TPs indicated the role of RCS in UV/NH2Cl transformation even though UV photolysis was predominantly responsible for the ACE degradation. The Vibrio fischeri bioluminescence inhibition assay revealed a higher toxicity of TPs derived from UV/NH2Cl than from UV photolysis. The increased toxicity could be attributed to most of the generated chlorinated-TPs (Cl-TPs), in particular those halo-alcohols. The ECOSAR program predicts that halo-alcohol TPs are more toxic than their non-chlorinated analogues and other Cl-TPs. This study provides insight into the important role of reactive species in the micropollutants’ transformation of UV/NH2Cl process. It further provides information relevant to the potential risk when applying the process for micropollutant removal in water treatment.
AB - UV/monochloramine (UV/NH2Cl) is an emerging advanced oxidation process that can generate various reactive species like reactive chlorine species (RCS) and hydroxyl radicals for micropollutant removal. This study investigated the potential toxicity of transformation products resulting from UV/NH2Cl treatment of acesulfame (ACE), as an example of micropollutant, found in worldwide aquatic environment. Compared with UV photolysis and chloramination, the UV/NH2Cl process more effectively degraded ACE. The transformation products of ACE treated with the UV/NH2Cl process were identified and characterized with high resolution mass spectrometry. The formation of chlorinated-TPs indicated the role of RCS in UV/NH2Cl transformation even though UV photolysis was predominantly responsible for the ACE degradation. The Vibrio fischeri bioluminescence inhibition assay revealed a higher toxicity of TPs derived from UV/NH2Cl than from UV photolysis. The increased toxicity could be attributed to most of the generated chlorinated-TPs (Cl-TPs), in particular those halo-alcohols. The ECOSAR program predicts that halo-alcohol TPs are more toxic than their non-chlorinated analogues and other Cl-TPs. This study provides insight into the important role of reactive species in the micropollutants’ transformation of UV/NH2Cl process. It further provides information relevant to the potential risk when applying the process for micropollutant removal in water treatment.
KW - acesulfame
KW - Advanced Oxidation Process
KW - toxicity
KW - transformation products
KW - UV/monochloramine
UR - http://www.scopus.com/inward/record.url?scp=85091349206&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.123935
DO - 10.1016/j.jhazmat.2020.123935
M3 - Journal article
C2 - 33264984
AN - SCOPUS:85091349206
SN - 0304-3894
VL - 403
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 123935
ER -
