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Effects of ozone and ozone/peroxide pretreatments on disinfection byproduct formation during subsequent chlorination and chloramination.
MedLine Citation:
PMID:  23009791     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Ozone (O(3)) and ozone/hydrogen peroxide (O(3)/H(2)O(2)) can be used in water treatment facilities to remove many organic micropollutants with taste, odor, and color implications. The effects of O(3) and O(3)/H(2)O(2) on the formation of disinfection byproducts (DBPs) in subsequent chlorination and chloramination processes, however, are not well determined. In this study, we compared the yields of a series of regulated and emerging DBPs during sequenced O(3)-Cl(2), O(3)/H(2)O(2)-Cl(2), O(3)-NH(2)Cl, and O(3)/H(2)O(2)-NH(2)Cl oxidation of 11 samples, each with different hydrophobicity, bromide concentration, soluble microbial products, and humic substances. For most water, pretreatment with O(3) and O(3)/H(2)O(2) increased the formation of chloral hydrate (CH), trichloronitromethane (TCNM) and haloketones (HKs) but lowered the yields of haloacetonitriles (HANs) during chlorination processes. Compared with O(3) alone, O(3)/H(2)O(2) in combination generated more CH and HKs during chlorination, and their extents of formation appeared to depend on the O(3) doses. In terms of chloramination, both O(3) and O(3)/H(2)O(2) reduced THM, HAA, and HAN formation significantly without increasing CH, TCNM, or HKs. These results suggest that O(3) or O(3)/H(2)O(2) pretreatments may provide some benefits for the chloramination process in controlling regulated and emerging DBPs in waters without high bromide content.
Authors:
Xin Yang; Jinfeng Peng; Baiyang Chen; Wanhong Guo; Yongmei Liang; Wei Liu; Lu Liu
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-11
Journal Detail:
Title:  Journal of hazardous materials     Volume:  -     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China; School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: yangx36@mail.sysu.edu.cn.
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