University Institute of Water and Environmental Sciences, University of Alicante, 03690, San Vicente del Raspeig, Alicante, Spain.
University Institute of Water and Environmental Sciences, University of Alicante, 03690, San Vicente del Raspeig, Alicante, Spain.
Sci Total Environ. 2018 Oct 15;639:228-236. doi: 10.1016/j.scitotenv.2018.05.150. Epub 2018 May 19.
In this study, the removal of parabens from waters, using a combined treatment of magnetic ion exchange resins and subsequent filtration through nanofiltration membranes, was investigated. The selected parabens were methylparaben, ethylparaben, propylparaben and butylparaben. Two different magnetic anionic exchanger resins, MIEX® DOC and MIEX® GOLD, and two nanofiltration membranes (NF), NF-90 and DESAL-HL, were tested. The study was carried out using mono and multicomponent systems, using deionized water and natural waters sampled from two different rivers. In this way, competitive and matrix effects could be evaluated. The results showed, that with the combined treatments, higher elimination rates were obtained. The best removal efficiencies were obtained when the DOC resin was combined with both NF-90 and DESAL-HL membranes. Thus, butylparaben and propylparaben reached removal yields around 100% with both membranes, whereas the corresponding values for methylparaben were 91%, when the NF-90 membrane was employed, or 92% when DESAL-HL membrane was utilized. The elimination rates of ethylparaben with the same treatments were 96% with the NF-90 and 97% when the DESAL-HL membrane was combined with the DOC resin. The elimination percentages were higher as the paraben alkyl chain length increased. In addition, no competitiveness or matrix effects were detected. When the MIEX® GOLD resin was used for pre-treatment, membrane fouling worsened which indicated that resin selection needs to be carefully considered to achieve the best results.
本研究采用磁离子交换树脂联合处理与纳滤膜过滤相结合的方法，去除水中的防腐剂。选择的防腐剂包括甲基对羟基苯甲酸酯、乙基对羟基苯甲酸酯、丙基对羟基苯甲酸酯和丁基对羟基苯甲酸酯。本研究选用了两种不同的磁性阴离子交换树脂 MIEX®DOC 和 MIEX®GOLD，以及两种纳滤膜（NF）NF-90 和 DESAL-HL。通过单组分和多组分体系，使用去离子水和取自两条不同河流的天然水样进行实验，以评估竞争和基质效应。结果表明，采用联合处理方法，可获得更高的去除率。DOC 树脂与 NF-90 和 DESAL-HL 膜联合使用时，去除效果最佳。因此，丁基对羟基苯甲酸酯和丙基对羟基苯甲酸酯与两种膜的去除率均接近 100%，而甲基对羟基苯甲酸酯的去除率在 NF-90 膜时为 91%，在 DESAL-HL 膜时为 92%。采用相同处理方法，乙基对羟基苯甲酸酯与 NF-90 膜的去除率为 96%，与 DESAL-HL 膜联合使用时为 97%。随着对羟基苯甲酸酯烷基链长度的增加，去除率也随之提高。此外，未检测到竞争或基质效应。当 MIEX®GOLD 树脂用于预处理时，膜污染加剧，这表明需要仔细考虑树脂的选择，以达到最佳效果。
