期刊
CHINESE SCIENCE BULLETIN
卷 56, 期 32, 页码 3437-3444出版社
SCIENCE PRESS
DOI: 10.1007/s11434-011-4712-8
关键词
TiO(2)/UV; natural organic matter; membrane fouling; molecular weight distribution; excitation and emission matrix
资金
- National Water Pollution Control and Treatment Key Technologies RD Program [2008ZX07421-006, 2009ZX 07424-006]
A flat submerged membrane combined with a TiO(2)/UV photocatalytic reactor (FSMPR) was employed in batch mode to remove humic acid (HA). HA removal efficiency was characterized by UV(254) absorbance, UV-vis spectra, dissolved organic carbon (DOC) concentration, specific UV absorbance (SUVA), and trihalomethane formation potential (THMFP). The FSMPR process was effective in removing more than 86% of DOC and nearly 100% of UV(254) absorbance, while the THMFPs of samples were reduced to < 19 mu g/L after 150 min of treatment. In addition, changes in transmembrane pressure (TMP) with and without UV were evaluated; TiO(2)/UV was effective at controlling membrane fouling by HA. Analysis of the molecular weight (MW) distributions and three-dimensional excitation-emission matrix (EEM) fluorescence spectra of HAs revealed that the effectiveness in membrane fouling control is a result of changes in HA molecular characteristics. The TiO(2)/UV photocatalytic reactor caused the degradation of high MW, hydrophobic humic-like molecules to low MW, hydrophilic protein-like molecules, although this fraction was not completely removed during 150 min of treatment and was less responsible for membrane fouling.
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