Evaluation of humic acid removal by a flat submerged membrane photoreactor |
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| Authors: | Yong Wei HuaQiang Chu BingZhi Dong Xuan Li |
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| Affiliation: | WEI Yong 1,2,CHU HuaQiang 1*,DONG BingZhi 1* & LI Xuan 1 1 School of Environmental Science and Engineering,State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China,2 School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164 |
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| Abstract: | A flat submerged membrane combined with a TiO2/UV photocatalytic reactor (FSMPR) was employed in batch mode to remove humic acid (HA). HA removal efficiency was characterized by UV254 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 UV254 absorbance, while the THMFPs of samples were reduced to < 19 μg/L after 150 min of treatment. In addition, changes in transmembrane pressure (TMP) with and without UV were evaluated; TiO2/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 TiO2/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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| Keywords: | TiO 2 /UV natural organic matter membrane fouling molecular weight distribution excitation and emission matrix |
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