电絮凝/氧化—超滤协同去除水中NOM的研究  

Removal of Natural Organic Matter by Electro-coagulation/Oxidation-Ultrafiltration Technology

作　　者：苏菲 李英华[1] 李海波[1] 杨蕾[1] 徐新阳[1] SU Fei;LI Ying-hua;LI Hai-bo;YANG Lei;XU Xin-yang(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《中国给水排水》2020年第23期31-36,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(41571455、51578115)。

摘　　要：以腐殖酸与富里酸混合液模拟饮用水中天然有机物(NOM),并采用电絮凝/氧化—超滤(EC/O—UF)工艺协同去除,主要考察电流密度、初始有机物浓度、初始pH值、初始电导率对NOM去除效能的影响,初步探究了EC/O—UF作用机理,并分析了膜污染机制。结果表明,在电流密度为10 A/m2、初始pH值为7、初始电导率为1 000μS/cm、初始有机物浓度为10 mg/L时,联合工艺对有机物的去除率可达94%~97%。在去除过程中,EC/O—UF首先将有机物氧化成小分子,改善滤饼层极性,在膜过滤前将有机物絮凝,形成具有更多极化结构的滤饼层,从而减缓膜污染。膜污染主要由电解过程产生的铝絮凝剂与NOM形成的颗粒物质导致,经化学清洗后膜通量可恢复至初始膜通量的93%~96%。Natural organic matter(NOM)in drinking water was simulated by a mixture of humid acid and fulvic acid,which was removed by electro-coagulation/oxidation-ultrafiltration(EC/O-UF)process.The effects of current density,initial organic concentration,initial p H and initial conductivity on NOM removal were investigated.Additionally,the mechanism of EC/O-UF was explored and the reasons for membrane fouling were analyzed.When current density was 10 A/m2,initial pH was 7,initial NOM concentration was 10 mg/L and initial conductivity was 1000μS/cm,the removal efficiency of NOM by EC/O-UF reached 94%-97%.During the removal process,NOM was first oxidized into small molecules,which improved the polarity of the cake layer.Then the organic matter was coagulated prior to filtration to form a filter cake layer with more polarized structure,thereby mitigated membrane fouling.Membrane fouling was mainly caused by particulate matters formed by aluminum flocculants and NOM,and membrane flux could be restored to 93%-96%of the original one after acid chemical cleaning.

关 键 词：天然有机物 电絮凝 电氧化 超滤 

分 类 号：TU991[建筑科学—市政工程]