期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 297, 期 -, 页码 119-126出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.04.070
关键词
Trihalomethanes; Bio-treated municipal wastewater; Molecular weight; Hydrophobicity; Fluorescence
资金
- outstanding Young and Middle-aged Scientists Research Fund of Shandong Province [BS2012HZ004]
- [21207074]
- [21377072]
Due to concerns over health risk of disinfection byproducts (DBPs), removal of trihalomethanes (THMs) precursor from bio-treated wastewater by coagulation and adsorption was investigated in this study. Ultrafiltration (UF) membranes and nonionic resins were applied to fractionate THMs precursor into various molecular weight (MW) fractions and hydrophobic/hydrophilic fractions. Characteristics of coagulated water and adsorbed water were evaluated by the three-dimensional excitation and emission matrix (3DEEM) fluorescence spectroscopy. Results showed that coagulation and adsorption were suitable for removing different hydrophobic/hydrophilic and fluorescent fractions. Coagulation decreased THMs concentration in hydrophobic acids (HoA) fraction from 59 mu g/L to 39 mu g/L, while the lowest THMs concentration (9 mu g/L) in hydrophilic substances (HiS) fraction was obtained in adsorbed water. However, both coagulation and adsorption were ineffective for removing fractions with MW< 5 kDa. Although coagulation and adsorption processes could reduce THMs formation, some specific THMs formation potential (STHMFP) in residual dissolved organic matter (DOM) fractions increased in this study. Hydrophobic acid and hydrophilic fractions increased after coagulation treatment, and low MW and hydrophobic fractions increased after adsorption treatment. In addition, active carbon adsorbed more organic matter than coagulant, but brominated disinfection byproducts (Br-DBPs) in adsorbed water turned to the major THMs species after chlorination. (C) 2015 Elsevier B.V. All rights reserved.
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