Rejection properties of aromatic pesticides with a hollow-fiber NF membrane
Rejection properties of aromatic pesticides with a hollow-fiber NF membrane
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DOI：
10.1016/j.desal.2004.11.087
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发表时间：
2005-08-15
期刊：
影响因子：
9.9
通讯作者：
Ariji, A
中科院分区：
文献类型：
--
作者：
Jung, YJ;Kiso, Y;Ariji, A
纳滤膜因能去除农药、三甲胺前体等有害有机微污染物以及硬度，在饮用水处理领域受到广泛关注。在装有中空纤维纳滤膜的小型流动池中，考察了10种芳香族农药(中心点L-1)对0.045~0.194 mg中心点农药的截留性能。将渗透液和保留液都返回进料槽，进行10天的分离实验。虽然进料液和残留物的浓度在试验的前半段有所下降，但在试验的后半段获得了稳定的截留率。根据截留物和进料的平均浓度计算截留率，根据初始进料浓度计算截留率。去除效果在45.0-93.8%之间，但基于饲料浓度的截留率相对较低(41.0-88.4%)。溶质渗透性的对数(LogB)与农药的相对分子质量呈线性相关。此外，间歇式吸附实验表明：所有农药都被吸附在膜上，吸附性能不仅受农药的疏水性(LogP)控制，而且受分子平面性的控制。
NF membranes have been drawing much attention in the field of drinking water treatment because they can remove hazardous organic micro-pollutants such as pesticides and THM precursors, as well as hardness. The rejection properties for 10 kinds of aromatic pesticides (0.045-0.194 mg center dot L-1) were investigated with a bench-scale flow cell equipped with a hollow-fiber NF membrane (HNF- 1, the nominal desalting degree 35% at 0.3 MPa). Both the permeate and retentate were returned to the feed tank, and separation experiments were conducted for 10 days. Although the feed and retentate concentrations decreased in the first half of the experimental period, stable rejections were obtained in the latter half of the period. The rejections were calculated based on the average concentrations of the retentate and feed, and the removals were on the initial feed concentration. The removals were in the range of 45.0-93.8%, but the rejections based on the feed concentrations were relatively low (41.0-88.4%). The logarithm of the solute permeability (log B) correlated linearly with the molecular weight of the pesticides. In addition, the batch-type adsorption experiments indicated the following results: all pesticides were adsorbed on the membrane and the adsorption properties were controlled not only by hydrophobicity (log P) of the pesticides but also by molecular planarity.