globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2018.11.041
Scopus ID: 2-s2.0-85057460434
Title:
PPCP degradation and DBP formation in the solar/free chlorine system: Effects of pH and dissolved oxygen
Author: Hua Z.; Guo K.; Kong X.; Lin S.; Wu Z.; Wang L.; Huang H.; Fang J.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2019
pages begin: 77
pages end: 85
Language: 英语
Keyword: Disinfection byproducts (DBPs) ; Hydroxyl radicals (HO[rad]) ; Pharmaceuticals and personal care products (PPCPs) ; Reactive chlorine species ; Solar/chlorine
Scopus Keyword: Biological materials ; Chlorination ; Chlorine ; Disinfection ; Dissolved oxygen ; Energy efficiency ; Ozone ; pH effects ; Photolysis ; Potable water ; Disinfection byproducts ; Hydroxyl radicals ; Pharmaceuticals and personal care products ; Reactive chlorine species ; Solar/chlorine ; Chemicals removal (water treatment) ; atrazine ; azithromycin ; bezafibrate ; caffeine ; carbamazepine ; chloramphenicol ; chlorine ; cyclophosphamide ; diclofenac ; dimetridazole ; dissolved oxygen ; drinking water ; flumequine ; gemfibrozil ; hydroxyl radical ; ibuprofen ; metoprolol ; metronidazole ; nalidixic acid ; naproxen ; natural organic matter ; ornidazole ; ozone ; paracetamol ; phthalic acid dibutyl ester ; primidone ; propranolol ; sulfamethoxazole ; trimethoprim ; venlafaxine ; byproduct ; chlorine ; degradation ; disinfection ; dissolved oxygen ; energy efficiency ; hydroxyl radical ; pH ; pollutant removal ; PPCP ; reactive transport ; water treatment ; Article ; chlorination ; concentration at steady-state ; degradation kinetics ; disinfection ; pH ; photodegradation ; photolysis ; priority journal ; simulation ; solar radiation ; waste component removal ; water treatment
English Abstract: The solar/chlorine process produces multiple reactive species by solar photolysis of chlorine, which can be used as an energy-efficient technology for water treatment. This study investigated the effects of pH and dissolved oxygen (DO) on the degradation of pharmaceuticals and personal care products (PPCPs) and on the formation of disinfection byproducts (DBPs) in the solar/chlorine system. The degradation of 24 structurally diverse PPCPs was enhanced appreciably in the solar/chlorine system compared to solar irradiation and dark chlorination. The reactive species in the solar/chlorine system were identified to be hydroxyl radicals (HO[rad]), reactive chlorine species (RCS, i.e., Cl[rad] and ClO[rad]) and ozone. With increasing pH from 6 to 8, the steady-state concentrations of HO[rad] and Cl[rad] decreased from 1.23 × 10 −14 M to 4.79 × 10 −15 M and from 9.80 × 10 −16 M to 4.31 × 10 −16 M, respectively, whereas that of ClO[rad] increased from 5.30 × 10 −14 M to 2.68 × 10 −13 M and the exposure of ozone increased from 0.44 μM min to 1.01 μM min in 90 min. Accordingly, the removal efficiencies of 6 PPCPs decreased and 11 PPCPs increased. The decreased removal of PPCPs with increasing pH was due to the decrease in HO[rad] and Cl[rad], while the increased removal was attributed to the increased ClO[rad] and ozone. The presence of DO enhanced the degradation of most PPCPs, indicating the role of ozone on the degradation. The formation of total organic chlorine (TOCl) and known DBPs was enhanced by 60.7% and 159.4%, respectively, in the solar/chlorine system compared to chlorination in a simulated drinking water containing 2.5 mg L −1 natural organic matter (NOM). As the pH rose from 6 to 8, TOCl formation decreased by 16.2%, while that of known DBPs increased by 58.6% in solar/chlorine. The absence of DO slightly suppressed the formation of TOCl and known DBPs. This study illustrated the significant role of RCS in the solar/chlorine system, which enhanced the degradation of micropollutants but increased the formation of chlorinated DBPs. © 2018 Elsevier Ltd
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被引频次[WOS]:7   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/122103
Appears in Collections:气候变化事实与影响

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Affiliation: Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China

Recommended Citation:
Hua Z.,Guo K.,Kong X.,et al. PPCP degradation and DBP formation in the solar/free chlorine system: Effects of pH and dissolved oxygen[J]. Water Research,2019-01-01
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