DOI: 10.1016/j.watres.2018.04.013
Scopus记录号: 2-s2.0-85045072581
论文题名: Controlling bromate formation in the Co(II)/peroxymonosulfate process by ammonia, chlorine-ammonia and ammonia-chlorine pretreatment strategies
作者: Ling L. ; Li Z. ; Fang J. ; Shang C.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 139 起始页码: 220
结束页码: 227
语种: 英语
英文关键词: Acidic pH
; Ammonia
; Bromate
; Co(II)/PMS
; Monochloramine
Scopus关键词: Ammonia
; Bromine compounds
; Chlorine
; Chlorine compounds
; Organic pollutants
; Rate constants
; Sulfur compounds
; Water pollution
; Acidic pH
; Bromate
; Bromate formation
; Monochloramine
; Pre-Treatment
; Reduction level
; Sulfate radicals
; Cobalt compounds
; ammonia
; bromate
; chlorine
; cobalt
; monochloramine
; peroxymonosulfate
; sulfate
; unclassified drug
; ammonia
; bromate
; chloramine derivative
; chlorine
; cobalt
; hypobromous acid
; peroxide
; peroxymonosulfate
; tosylchloramide sodium
; ammonia
; bromine compound
; chlorine
; cobalt
; concentration (composition)
; pH
; radical
; reaction rate
; redox conditions
; sulfate
; Article
; chemical reaction kinetics
; concentration (parameters)
; degradation
; oxidation
; priority journal
; proton transport
; reduction (chemistry)
; water treatment
; chemistry
; oxidation reduction reaction
; procedures
; water management
; water pollutant
; Ammonia
; Bromates
; Chloramines
; Chlorine
; Cobalt
; Oxidation-Reduction
; Peroxides
; Water Pollutants, Chemical
; Water Purification
英文摘要: The Co(II)/peroxymonosulfate (Co(II)/PMS) process, producing sulfate radicals (SO4 •-), effectively removes organic pollutants in water, while producing a significant amount of bromate (BrO3 −) in the presence of bromide (Br−). This paper investigates the ammonia (NH3) addition, chlorine-ammonia (Cl2-NH3) and ammonia-chlorine (NH3-Cl2) pretreatment strategies in controlling BrO3 − formation in 20 min in the Co(II)/PMS process at pH 4.0. The addition of NH3 retarded the BrO3 − formation, but only at a reduction level of about 9.5% for NH3 concentration of 50 μM, and was mainly attributed to the protonation of NH3 at pH 4 (99.99% as NH4 +, did not react with HOBr). Both the Cl2-NH3 and NH3-Cl2 pretreatment strategies at HOCl and NH3 dosages of 15 and 50 μM, respectively, reduced 95% or more of the overall BrO3 − formation and retarded the BrO3 − formation, with the NH3-Cl2 pretreatment strategy outperforming Cl2-NH3. The reduction of the BrO3 − formation was mainly attributed to the formation of monochloramine (NH2Cl) in both pretreatment strategies. NH2Cl effectively outcompetes SO4 •- to react with HOBr and forms NHBrCl, with the apparent reaction rate constant between NH2Cl and HOBr more than 100 times faster than that between SO4 •- and HOBr. However, the oxidation/degradation of NHBrCl in the Co(II)/PMS process reforms HOBr, and, although less in quantity, is oxidized to BrO3 − at higher Co(II) and Br− concentrations. Thus, the NH3-Cl2 and Cl2-NH3 pretreatment strategies inhibit the BrO3 − formation more significantly at lower Co(II) and Br− concentrations. In all cases, the generation of SO4 •- in 20 min was not affected by the implementation of the three BrO3 − pretreatment strategies. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112735
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Recommended Citation:
Ling L.,Li Z.,Fang J.,et al. Controlling bromate formation in the Co(II)/peroxymonosulfate process by ammonia, chlorine-ammonia and ammonia-chlorine pretreatment strategies[J]. Water Research,2018-01-01,139