以天然水为原料液的正渗透过程中CTA膜表面污染物脱附研究
作者:杨瑞林,张新欢,董秉直,夏圣骥
单位: 同济大学 环境科学与工程学院 上海,200092
关键词: 正渗透;膜污染;天然有机物;膜通量。
分类号: TQ028.8
出版年,卷(期):页码: 2015,35(3):37-43

摘要:
选择浓缩天然水作为污染物,研究了错流过滤的正渗透膜系统处理水中有机物时,不同实验温度和错流速度下膜通量的变化;通过对被污染的膜进行洗脱,得到洗脱液,并对洗脱液进行了分析,得到污染物在正渗透膜的沉积规律。结果表明,温度对通量和膜污染影响很大,温度越高膜污染越强,膜通量下降越大;错流速度对通量和膜污染也有明显的影响,错流速度越小膜污染越严重,膜通量下降越大。膜上的污染物主要以蛋白质和氨基酸为主,该类物质主要在发射波长 320-360nm、激发波长 210-230nm的荧光区域有响应。污染物的分子量主要分布在630000Da和800Da左右。正渗透过程中CTA膜对天然有机物中的腐殖质有很强的抗污能力。
:Fouling of cellulose triacetate (CTA) forward osmosis (FO) membranes was studied by a cross-flow flat-sheet forward osmosis membrane system. Concentrated natural water was employed as the feed solution (FS), and a sodium chloride solution (3 mol/L) was used for the draw solution (DS). Various temperatures and cross-flow velocities were concerned. The membrane flux was calculated by recording the mass changing of the FO andthe substances absorbed on the membranes were extracted by ultrasonic oscillation. The extracted foulant was characterized by methodologies including fluorescence excitation-emission matrices (EEMs) and liquid chromatography with organic carbon detector (LC-OCD). The results showed that a higher cross-flow velocity and lower temperature benefits the anti-fouling capacity of the membrane significantly. Proteins and amino acids were the main foulants on the membrane, withthe molecular weight distributing in two levels: near 630000 Da and 800 Da. CTA membrane has a strong anti-fouling capability to humic acid substances in forward osmosis process.
 

基金项目:
国家自然科学基金,钙离子对有机物形成正渗透膜污染的影响机制及调控(51378367)

作者简介:
杨瑞林(1991-),男,安徽六安人,硕士,同济大学环境科学与工程学院,学生,从事正渗透水处理技术研究。

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