Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 239, Issue -, Pages 348-354Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2012.09.006
Keywords
Chlorination; Chloramination; Ozonation; O-3/H2O2; Emerging disinfection byproducts
Categories
Funding
- National Natural Science Foundation of China [51008316]
- China's Fundamental Research Funds for the Central Universities [11lgzd15]
- Natural Science Foundation of Guangdong province, China [10451027501005074]
- Program for New Century Excellent Talents in University [NCET-10-0860]
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [HIT.NSFIR.2011127]
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Ozone (O-3) and ozone/hydrogen peroxide (O-3/H2O2) 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/H2O2 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/H2O2-Cl-2, O-3-NH2Cl, and O-3/H2O2-NH2Cl 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/H2O2 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/H2O2 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/H2O2 reduced THM, HAA, and HAN formation significantly without increasing CH, TCNM, or HKs. These results suggest that O-3 or O-3/H2O2 pretreatments may provide some benefits for the chloramination process in controlling regulated and emerging DBPs in waters without high bromide content. (C) 2012 Elsevier B.V. All rights reserved.
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