title: Ozonation effects on emerging micropollutants and effluent organic matter in wastewater: characterization using changes of three-dimensional HP-SEC and EEM fluorescence data.
abstract: The degradation of effluent organic matter (EfOM) in a municipal wastewater treated by ozonation was characterized using the methods of high-performance size-exclusion chromatography (HP-SEC) and excitation/emission matrix (EEM) fluorescence combined with parallel factor analysis (PARAFAC). The removal of 40 diverse trace-level contaminants of emerging concern (CEC) present in the wastewater was determined as well. Ozonation caused a rapid decrease of the absorbance and fluorescence of the wastewater, which was associated primarily with the oxidation of high and low apparent molecular weight (AMW) EfOM fractions. PARAFAC analysis also showed that components C1 and C2 decreased prominently in these conditions. The EfOM fraction of intermediate molecular weight ascribable to a terrestrial humic-like component (C3) tended to be less reactive toward ozone. Relative changes of EEM fluorescence were quantified using Fmaxvalues of PARAFAC-identified components (∆F/F0max). Unambiguous relationships between ∆F/F0maxvalues and the extent of the degradation of the examined CECs (∆C/C0) were established. This allowed correlating main parameters of the ∆C/C0vs. ∆F/F0maxrelationships with the rates of oxidation of these CECs. The results demonstrate the potential of online measurements of EEM fluorescence for quantitating effects of ozonation on EfOM and micropollutants in wastewater effluents.
authors.affiliation: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards & Environment, Chinese Academy of Sciences, Chengdu, 610041, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Liu
authors.affiliation: College of Environmental Science & Engineering, Tongji University, Shanghai, 200092, China.
authors.forename: Penghui
authors.initials: P
authors.lastname: Li
authors.affiliation: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards & Environment, Chinese Academy of Sciences, Chengdu, 610041, China. xytang@imde.ac.cn.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Tang
authors.affiliation: Department of Civil & Environmental Engineering, University of Washington, Seattle, WA, 98195-2700, USA.
authors.forename: Gregory V
authors.initials: GV
authors.lastname: Korshin
mesh_terms: D002850:Chromatography, Gel; D005163:Factor Analysis, Statistical; D008970:Molecular Weight; D009930:Organic Chemicals / Q000032:analysis*; D010084:Oxidation-Reduction; D010126:Ozone / Q000032:analysis*; D013050:Spectrometry, Fluorescence; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D010126:Ozone; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Contaminants of emerging concern (CEC); Effluent organic matter (EfOM); Excitation/emission matrix (EEM) fluorescence; Ozonation; Size-exclusion chromatography (SEC)