Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 76, Issue -, Pages 289-298Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2018.05.012
Keywords
Ozonation; Two-dimensional correlation spectra (2D-COS); Effluent organic matter (EfOM); Selectivity
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Funding
- National Key Technology Support Program [2014BAC13B06]
- National Natural Science Foundation of China [51708443, 51378414]
- National Key Research and Development Program of China [2016YFC0400701]
- China Postdoctoral Science Foundation [2017M623326XB]
- Program for Innovative Research Teams in Shaanxi [2013KCT-13]
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The characteristics of effluent organic matter (EfOM) from a wastewater treatment plant (WWTP) during ozonation were investigated using excitation and emission matrix (EEM) spectra, Fourier transform infrared spectroscopy (FT-IR) and high-performance size exclusion chromatography (HPSEC) at different ozone dosages. The selectivity of ozonation towards different constituents and functional groups was analysed using two-dimensional correlation spectra (2D-COS) probed by FT-IR, synchronous fluorescence spectra and HPSEC. The results indicated that ozonation can destroy aromatic structures of EfOM and change its molecular weight distribution (MWD). According to 2D-COS analysis, microbial humiclike substances were preferentially removed, and then the protein-like fractions. Terrestrial humic-like components exhibited inactivity towards ozonation compared with the above two fractions. Protein-like substances with small molecular weight were preferentially reacted during ozonation based on 2D-COS probed by HPSEC. In addition, the selectivity of ozone towards different functional groups of EfOM exhibited the following sequence: phenolic and alcoholic C- O groups > aromatic structures containing C=C double bonds > aliphatic C- H. X-ray photoelectron spectroscopy (XPS) further elucidated the preferential reaction of aromatic structures in EfOM during ozonation. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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