纳滤去除饮用水中的PFOS

Nanofiltration membrane process for removal of PFOS from drinking water

全氟辛烷磺酸类物质(PFOS)是一种新型持久性有机污染物,对人类健康存在很大威胁,目前世界范围内的水体中均检测到不同浓度的PFOS。研究如何安全有效去除这类新型污染物十分必要。利用HYDRA-core 10纳滤膜进行PFOS去除研究,在不同操作压力下研究pH、电解质以及与腐殖酸共存对PFOS截留效果的影响。结果表明,随着pH值的增加,截留率上升;二价盐对PFOS截留率的影响要高于一价盐,并且随着二价盐离子强度的增加,截留率上升;腐殖酸共存时截留效率有显著增加,尤其在1 mmol/L钙离子存在条件下,PFOS的截留率可达到95.8%,但会引起膜通量下降及膜污染的发生。

Perfluorooctane sulfonate （PFOS） as one class of emerging pollutants detected from waters has drew great attention in recent years. How to remove PFOS from surface water and ensuring the security of drink- ing water for human beings is very important. In this study, HYDRA-core 10 nanofiltration membrane was used to remove PFOS from stimulate water, and the effects of operating pressure, pH, electrolytes, and humic acid on PFOS rejection were investigated. The results showed that the PFOS rejection increased with pH increase. The divalent salts could improve PFOS rejection compared with the monovalent salts, and the PFOS rejection in- creased with increasing ionic strength of divalent salts. The humic acid addition improved significantly PFOS re- jection, and it can reach up to 95.8% in the 1 mmol/L Ca2＋ existence, but it would also cause membrane foul- ing and the decline of membrane flux.