Removal of natural organic matter by ultrafiltration with TiO2-coated membrane under UV irradiation

被引:47
|
作者
Syafei, Arie Dipareza [2 ]
Lin, Cheng-Fang [1 ]
Wu, Chung-Hsin [3 ]
机构
[1] Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 10764, Taiwan
[2] Sepuluh Nopember Inst Technol, Dept Environm Engn, Surabaya, Indonesia
[3] Da Yeh Univ, Dept Environm Engn, Da Tsuen, Chang Hua, Taiwan
关键词
ultrafiltration; TiO2; photocatalysis; humic acid; membrane fouling; flux decline;
D O I
10.1016/j.jcis.2008.03.037
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study investigates the performance of ultrafiltration (UF) by membranes coated with titanium dioxide (TiO2) photocatalyst under ultraviolet (UV) illumination in removing natural organic matter (NOM) and possibly in reducing membrane fouling. Experiments were carried out using heat-resistant ceramic disc UF membranes and humic acids as model substances representing naturally occurring organic matter. Membrane sizes of 1, 15, and 50 kDa were used to examine the effects of coating under ultraviolet irradiation. A commercial humic solution was subjected to UF fractionation (batch Process); gel filtration chromatography was applied to study the effects of molecular weight distribution of NOM on UF membrane fouling. When compared to naked membranes, UV254 (ultraviolet light of lambda = 254 nm) illumination of TiO2-coated membranes exhibits more flux decline with similar effluent quality. Although the UF membrane is able to remove a significant amount of humic materials, the incorporated photocatalysis results in poor performance in terms of permeate flux. The TiO2-coated membrane under UV254 irradiation alters the molecular weight (MW) distribution of humic materials, reducing them to <1 kDa, which is smaller than the smallest (1-kDa) membrane in this study. Thus, TiO2-coated membranes under UV254 irradiation do not perform any better in removing natural organic matter and reducing membrane fouling. (C) 2008 Elsevier Inc. All rights reserved.
引用
收藏
页码:112 / 119
页数:8
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