论文部分内容阅读
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 ofozonation 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 hiclike 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.