Dissolved organic matter and arsenic removal with coupled chitosan/UF operation
Dissolved organic matter and arsenic removal with coupled chitosan/UF operation
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DOI：
10.1016/j.seppur.2007.09.002
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发表时间：
2008-05
影响因子：
8.6
通讯作者：
Cheng‐Fang Lin;Chung-Hsin Wu;Hsien-Tin Lai
中科院分区：
文献类型：
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作者：
Cheng‐Fang Lin;Chung-Hsin Wu;Hsien-Tin Lai
长期摄入砷会引起癌症和黑脚病。目前仍有数百万人饮用砷污染的水。研究了壳聚糖/超滤耦合工艺的除砷性能以及溶解性有机物对超滤除砷效果的影响。通过凝胶过滤色谱法将代表溶解有机质的腐殖酸分成五组分子大小。在本实验条件下，超滤对砷的去除率仅为10%。在腐殖酸存在下，砷的去除率达到22%。表观分子量>35，000 Da的DOM是负责螯合砷并随后被超滤膜截留的主要组分。腐殖化合物，壳聚糖和砷的组合相互作用，使65%的砷排斥超滤。本文的结果使我们能够理解壳聚糖/UF/DOM/砷体系的复杂机理。
Long time uptake arsenic will cause cancers and blackfoot disease. There are still several million people suffering from drinking arsenic contaminated water. This work studied the performance of coupled chitosan/UF for arsenic removal and the influence of dissolved organic matter on arsenic removal with UF operation. Humic acid representing dissolved organic matter was fractionated into five groups of molecular sizes by gel filtration chromatography. Arsenic rejection by UF under the experimental condition is only 10%. In the presence of humic compounds, the arsenic removal of 22% is obtained. DOM with apparent molecular weight>35,000Da is the principle component responsible for chelating arsenic and thereafter being rejected by UF membrane. The combined interactions of humic compounds, chitosan, and arsenic enable a 65% arsenic rejection by UF. The results presented here enable our understanding of the complicated mechanisms involved in chitosan/UF/DOM/arsenic system.