纳滤/反渗透膜去除水中四环素的性能

Changes of membrane performance in the Removal Tetracycline Process by Nanofiltration and Reverse Osmosis

摘要:

基于动态与静态试验方法，对芳香聚酰胺纳滤膜(NF)与反渗透(RO)膜去除饮用水中四环素物质(TC)进行了研究。试验结果表明， NF膜和RO膜对水中四环素的去除具有吸附作用；NF膜和RO膜对TC的吸附质量分别为35%和40%，且与水中TC的质量浓度成正比，平衡吸附率与初始质量浓度无明显关系；四环素在NF膜和RO膜表面的静态吸附特性均遵循Freundlich吸附等温线。通过膜表面的红外光谱图和扫描电镜图发现，NF膜和RO膜对四环素的吸附作用较为显著，膜表面存在多种吸附位点，膜孔吸附造成膜的不可逆膜污染。

Abstract:

Based on the methods of dynamic and static, a study was made of the characteristics of removing tetracycline (TC) from drinking water by aromatic polyamide nanofiltration (NF) membrane & Reverse osmosis(RO) membrane was studied. The results showed that TCs removal by NF and RO accompanied the process of adsorption, and adsorption capacities of tetracycline by NF and RO was up to 35% and 40%, respectively. The adsorption capacity of TCs was proportional to its initial concentration，but there was no significant correlation between the equilibrium adsorption rate and its initial concentration. It elaborated the characteristic of static adsorption of TCs on the membrane surfaces fitted with Freundlich adsorption isotherms model. Besides, the significance of the adsorption of TCs by NF and RO membranes confirmed by the infrared spectrogram and scanning electron micrograph. Being kinds of adsorption sites on membrane surface for adsorbing TC simultaneously, adsorption contained membrane pore adsorption, which could lead to irreversible membrane fouling.