TiO_2光催化对微滤去除腐殖酸的膜污染控制研究  

Effect of TiO_2 photocatalytic oxidation on control of membrane fouling by humic acid in microfiltration

作　　者：白红伟[1,2] 邵嘉慧[1] 张西旺[2] 孙德来[2] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240 [2]新加坡南洋理工大学土木与环境工程学院,新加坡639798

出　　处：《环境工程学报》2010年第1期128-132,共5页Chinese Journal of Environmental Engineering

基　　金：国家"863"高技术研究发展计划项目(2006AA06Z307)

摘　　要：着重研究了不同紫外灯光源和照射时间条件下,TiO_2光催化(PCO)对微滤去除腐殖酸过程中的膜污染控制,并探讨了膜污染的控制机理。研究结果表明,TiO_2光催化能有效提高微滤对腐殖酸的去除,同时降低膜通量的下降,起到有效控制膜污染的作用。进一步的实验分析表明,TiO_2光催化控制膜污染的主要机理在于将腐殖酸降解为易于被TiO_2吸附的小分子量物质,吸附腐殖酸降解产物后的TiO_2聚合颗粒粒径增大,易于在膜表面形成更为松散的沉积层,并使膜污染从以膜孔堵塞和沉积层污染为主转化为以沉积层污染为主的可逆性污染。The effect of the UV light source and its irradiation time on the removal of humic acid and the flux of microfiltration （MF）, arid the fouling control mechanism by TiO2 photocatalytic oxidation（PCO） were given. Results showed that TiO2 photocatalytic oxidation was able to improve the removal of humic acid and slow down the flux reduction, at the same time played a role in membrane fouling control. The fouling control mechanism was proposed. Humie acid was first degraded into smaller molecular weight ones, which were easily to be adsorbed by TiO2 to form larger aggregated particles. These larger aggregated particles were then deposited on the membrane surface loosely but without blocking the membrane pores,which transferred the fouling from the irreversible phase （pore blocking） to reversible phase （cake layer）.

关 键 词：微滤 TIO2光催化 腐殖酸 膜污染 去除率 

分 类 号：X506[环境科学与工程—环境工程]