超滤去除水中内分泌干扰物(BPA)的效果和影响因素

Removal of EDCs(BPA) by Ultrafiltration and Impact Factors

采用终端超滤工艺去除饮用水中内分泌干扰物双酚A（BPA），主要考察了BPA初始浓度、膜截留相对分子质量、pH、离子强度和有机物对BPA去除效果的影响．结果表明，超滤对饮用水中BPA具有良好的去除效果．当BPA的初始浓度在100-600μg/L范围内，截留相对分子质量2000—10000的超滤膜对BPA的去除率均在92．0％以上．溶液的pH值接近BPA的pKa（9．6-11．3）时，BPA去除率明显降低．离子强度对去除率的影响较小．溶液中的腐殖酸对超滤去除BPA的影响较小．试验证实，吸附是超滤去除疏水性BPA分子的主要机理．

The removal of bisphenol A （BPA） in drinking water was investigated by ultrafihration membranes （UF） using dead-end stirred-cell filtration system. The experiment was focused on the effect of various factors on removal efficiency with respect to BPA initial concentration, molecular weight cut offs （MWCOs） of membrane, pH, ionic strength and organic matter. The results showed that UF could remove BPA effectively. UF with 2 000 - 10 000 MWCOs removed BPA by over 92%, with initial concentration of BPA ranging from 1130 to 600 μg/L. As pH of solution approached the pKo of BPA （9.6 - 11.3）, BPA removal efficiency dropped significantly. The effect of ionic strength on BPA removal was negligible. The influence of humic acid in solution on BPA removal was minor. It can be concluded that adsorption may play a significant role in UF process for removing hydrophobic molecular BPA.