DOM对纳滤膜去除磺胺甲恶唑效果影响研究

试验研究几种不同可溶性有机物(DOM)对纳滤膜(NF)去除抗生素磺胺甲恶唑(SMZ)的影响效果.试验所用DOM选定腐殖酸(HA)、单宁酸(TA)和海藻酸钠(SA).结果显示3种DOM对SMZ去除率和通量影响迥异,并与DOM的亲疏水性有密切的关系.为更好了解DOM对NF去除SMZ的影响机理,试验对臭氧化HA也进行了研究.臭氧化HA相对于臭氧前HA亲水性显著提高,对SMZ去除率的影响相应提高.结果表明在有多种DOM共同存在的天然原水中,SMZ的去除机理十分复杂,DOM的本身物理化学性质对于目标物的去除效果十分重要.

Effects of dissolved organic matter on sulfamethoxazole removal by NF membrane

The influence of different dissolved organic matter (DOM) on the removal of an antibiotic―sulfamethoxazole (SMZ) during nanofiltration (NF)processes was examined. Commercial humic acid (HA) and tannic acid (TA) as well as sodium alginate (SA) were selected as DOM. DOM used in the study displayed obviously diverse impacts on SMZ removal and flux decline by NF membranes. These impacts seemed to correlate with the hydrophobicity or hydrophilicity of DOM. To better understand the mechanism by which they affect SMZ transport across NF membrane, HA after ozonation was applied to examine. The ozonized HA was much more hydrophilic than HA and it presented a more significant effect on SMZ retention. The findings reported illustrated the complexity of the retention mechanism of SMZ in real water matrix where various DOM co-present, and confirmed the important role of physicochemical properties of DOM and target solute on process efficiency.