SU Fei,LI Ying-hua,LI Hai-bo,et al.Removal of Natural Organic Matter by Electro-coagulation/Oxidation-Ultrafiltration Technology[J].China Water & Wastewater,2020,36(23):31-36.
电絮凝/氧化—超滤协同去除水中NOM的研究
- Title:
- Removal of Natural Organic Matter by Electro-coagulation/Oxidation-Ultrafiltration Technology
- 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1 000 μS/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%。
- Abstract:
- 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 pH 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 1 000 μS/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.
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