混凝-超滤去除腐殖酸的试验研究

进行了直接超滤和混凝－超滤组合工艺对腐殖酸的去除效果和膜污染状况的试验。结果表明，超滤前另混凝土预处理对腐殖酸的DOC和UV254的去除率分别从28％、40％提高到53％、78％。同时高效液相色普（HPLC）分析表明，混凝－超滤组合工艺对分子质量＜6000u的有机物的去除率提高幅度更为显著。混凝－超滤组合工艺的最佳pH值条件pH=7,通过卷扫混凝使小分子有机物结合成微絮体，降低了膜孔污染，使超滤保持了较同的渗透通量。

Experimental Study on the Humic Acid Removal by Means of Coagulation-Ultrafiltration

Experiment was made on the humic acid removal and the membrane fouling by means of ultrafiltration with and without coagulation pretreatment. The results show that use of coagulation ahead of ultrafiltration for pretreatment of humic acid results in a rise in removal rate of DOC and UV 254 from 28% and 40% to 53% and 78% respectively. In the meantime, it is shown by high performance liquid chromatographic (HPLC) analysis that the coagulation - ultrafiltration process has significant improvement of removal rate of organic matters with molecular weight <6 000 u. The optimal pH value for coagulation - ultrafiltration process is 7, and sweeping coagulation can make small molecular organic matter agglomerated into micro flocs, which results in the reduction of membrane pore fouling and makes the ultrafiltration kept at high permeation flux.