MIEX—DOC离子交换树脂的饮用水除砷研究

对新型阴离子交换树脂MIEX—DOC@的除砷性能进行了研究，考察了该树脂除砷容量、对三价砷As（m）]和五价砷As（V）]的去除能力、不同离子和水体pH值对树脂除砷包括As（Ⅲ）和As（V）]效率的影响。结果表明，MIEX-DOC~树脂对人工配制高砷水（O．1mg·L-1）的除砷容量约为0．0051mg·mL-1；对As（Ⅲ）和As（V）的去除能力相当；常见的共存离子对树脂除砷效率有抑制或促进影响；不同pH值下，MIEX—DOC@树脂除砷效率不同，但对0．1mg·L-1的高砷水的除砷效率均达到50％以上。对农村高砷水的实地中试研究表明，当源水砷浓度约为0．1mg·L-1时，出水砷浓度低于0．05mg·L-1达到《生活饮用水卫生标准》（GB5749—2006）的农村小型集中式供水和分散式供水水质指标。成本分析结果表明，采用国产MIEX-DOC净水设备的除砷效果与进口设备相当，但除砷成本较低（0．56元·t-1），在我国农村高砷饮用水处理中有一定应用潜力。

Application of MIEX-DOC Ion Exchange Resin in Arsenic Removal from Drinking Water

The performance of MIEX-DOC~ ion exchange resin in the arsenic removal from drinking water was investigated,including the removal capacity for arsenic,the removal capability for As（ HI ） and As（ V ）, and the effects of different ions and pH values on removal capabilities for As（]]]） and As（ V ）. The result showed that MIEX-DOC~ resin＇s removal capacity for arsenic was about 0. 0051 mg · mL-1 ,and its capabilities of re- moving As（ HI ） and As（ V ） showed no significance （P~0.05）. Different ions showed significantly negative or positive effect on the arsenic removal of MIEX-DOC resin, pH Value also could greatly affect the arsenic re- moval,especially for As（]]I）,however,the arsenic removal was kept above 50% at the initial concentration of 0. 1 mg · L-1. The field experiment showed that,by application of MIEX-DOC resin under the concentration condition of around 10 mg · L-1 ,the arsenic concentration decreased to below 0.05 mg · L-1 ,which reached the （（Drinking Water Health Standards》 （GB 5749--2006） on the rural small-scale centralized water supply and de- centralized water supply. The localized equipment using MIEX-DOC resin was the same as the imported equip- ment in effeciency of arsenic removal, but cheaper in the cost. The running cost was 0.56 Yuan per ton water for the localized equipment. In consequence, MIEX-DOC~ resin has a significant potential in arsenic removal and can be applied to the China＇s countryside areas suffered from the high-arsenic drinking water.