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Article: pH significantly affects removal of trace antibiotics in chlorination of municipal wastewater

TitlepH significantly affects removal of trace antibiotics in chlorination of municipal wastewater
Authors
Issue Date2012
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2012, v. 46 n. 11, p. 3703-3713 How to Cite?
AbstractThe effect of pH on chlorination behaviors of 12 antibiotics, including β-lactams, sulfonamides, fluoroquinolones, tetracyclines, macrolides, and others at environmentally relevant concentrations was systematically examined in the effluent matrix of activated sludge process. The removal of most antibiotics (except cefalexin and tetracycline) significantly depended on pH in the range of 5.5-8.5. The elimination rates of ciprofloxacin, norfloxacin, anhydro-erythromycin, and roxithromycin increased while that of sulfamethoxazole decreased significantly with the increase of pH. Sulfadiazine, ofloxacin, and trimethoprim exhibited the highest reactivity with free available chlorine under the pH of 6-7, 7, and 7.5, respectively. Not only the free available chlorine species (HOCl and OCl⁻), but also the antibiotics species (cationic, neutral and anionic) affected the overall reaction rate. Anionic antibiotic species are usually much more reactive (1-3 orders of magnitude greater) than cationic antibiotic species toward free available chlorine. Although OCl⁻ is a weaker oxidant than HOCl, chlorination of sulfadiazine, sulfamethoxazole, ciprofloxacin, norfloxacin, and trimethoprim with OCl⁻ became significant at pH > 7.5. The observed kinetics rate constants calculated from species-specific rate constants could accurately (0.91 < R² < 0.99) predict the antibiotic removal in chlorination of activated sludge effluent with similar DOC and ammonia concentration to this study at a given pH value.
Persistent Identifierhttp://hdl.handle.net/10722/163859
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, B-
dc.contributor.authorZhang, T-
dc.date.accessioned2012-09-20T07:52:35Z-
dc.date.available2012-09-20T07:52:35Z-
dc.date.issued2012-
dc.identifier.citationWater Research, 2012, v. 46 n. 11, p. 3703-3713-
dc.identifier.issn0043-1354-
dc.identifier.urihttp://hdl.handle.net/10722/163859-
dc.description.abstractThe effect of pH on chlorination behaviors of 12 antibiotics, including β-lactams, sulfonamides, fluoroquinolones, tetracyclines, macrolides, and others at environmentally relevant concentrations was systematically examined in the effluent matrix of activated sludge process. The removal of most antibiotics (except cefalexin and tetracycline) significantly depended on pH in the range of 5.5-8.5. The elimination rates of ciprofloxacin, norfloxacin, anhydro-erythromycin, and roxithromycin increased while that of sulfamethoxazole decreased significantly with the increase of pH. Sulfadiazine, ofloxacin, and trimethoprim exhibited the highest reactivity with free available chlorine under the pH of 6-7, 7, and 7.5, respectively. Not only the free available chlorine species (HOCl and OCl⁻), but also the antibiotics species (cationic, neutral and anionic) affected the overall reaction rate. Anionic antibiotic species are usually much more reactive (1-3 orders of magnitude greater) than cationic antibiotic species toward free available chlorine. Although OCl⁻ is a weaker oxidant than HOCl, chlorination of sulfadiazine, sulfamethoxazole, ciprofloxacin, norfloxacin, and trimethoprim with OCl⁻ became significant at pH > 7.5. The observed kinetics rate constants calculated from species-specific rate constants could accurately (0.91 < R² < 0.99) predict the antibiotic removal in chlorination of activated sludge effluent with similar DOC and ammonia concentration to this study at a given pH value.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres-
dc.relation.ispartofWater Research-
dc.titlepH significantly affects removal of trace antibiotics in chlorination of municipal wastewater-
dc.typeArticle-
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1879-2448 (Electronic) 0043-1354 (Linkin&volume=46&issue=11&spage=3703&epage=13&date=2012&atitle=pH+significantly+affects+removal+of+trace+antibiotics+in+chlorination+of+municipal+wastewateren_US
dc.identifier.emailLi, B: libing@hku.hk-
dc.identifier.emailZhang, T: zhangt@hkucc.hku.hk-
dc.identifier.authorityZhang, T=rp00211-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.watres.2012.04.018-
dc.identifier.pmid22575156-
dc.identifier.scopuseid_2-s2.0-84861336214-
dc.identifier.hkuros208081-
dc.identifier.volume46-
dc.identifier.issue11-
dc.identifier.spage3703-
dc.identifier.epage3713-
dc.identifier.isiWOS:000304850600026-
dc.publisher.placeUnited Kingdom-
dc.identifier.citeulike10696219-

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