腐殖酸共存条件下NF90纳滤膜去除水中邻苯二甲酸二丁酯

水中共存有机物会对纳滤产生影响,以邻苯二甲酸二丁酯(DBP)为对象,研究了NF90膜对纯水、模拟水和河水中DBP的去除效果。DBP的初始质量浓度为100μg/L。结果表明,NF90膜能实现对微量DBP的有效去除,截留率高达90%以上;在模拟水中,腐殖酸共存时,会引起膜通量的下降和截留率的上升,pH为7时,截留率最高,其他无机离子(K+、Ca2+)的加入,会减小膜通量增大截留率,其中,Ca2+的影响尤为明显;河水中的无机物和有机物成分复杂,膜通量会进一步减小,截留率进一步提高;纳滤初期,吸附会影响截留率,6 h后吸附达到饱和,稳定运行96 h后,膜污染会引起膜通量和截留率的下降。

REMOVAL OF DIBUTYL PHTHALATE BY NF90 NANOFILTRATION MEMBRANE IN COEXISTENCE WITH HUMIC ACID

Nanofiltration filtering is effected by organic matters in water.The removal of dibutyl phthalate(DBP),in different water matrices(Milli-Q water,simulated water and river water) by nanofiltration(NF) was examined using NF90 nanofiltration membrane.DBP was added to different water matrices with concentration of 100 μg/L.The results showed that DBP could be effectively removed by the NF90,and the rejection rate was more than 90%.The humic acid(HA) added in the simulated water increased rejection and decreased flux,and the rejection was highest in pH 7,and the inorganic ions(K+,Ca2+) added in the simulated water increased rejection and decreased flux,in which Ca2+ had a bigger impact;In the river water,the rejection increased and flux decreased were more than those in simulated water because of more organic and inorganic matters in the river water.Adsorption effected rejection at filtering initial phase and reached the saturation in 6 hours,and membrane fouling decreased rejection and flux after stable running 96 hours.