Experimental Study on the Humic Acid Removal by Means ofCoagulation-Ultrafilt ration
tract:Experiment was made on the humic acid removal and the membrane fouling by means of ultrafiltration with and without coagulation pretreatment.The results show th at use of coagulation ahead of ultrafiltration for pretreatment of humic acid results in a rise in removal rate ofDOC and UV254 from 28% and 40 % to 53% and 78% respectively.In the meantime,it is shown by high performance l iquid chromatographic (HPLC) analysis that the coagulation-ultrafiltration proce ss has significant improvement of removal rate of organic matters with molecular weight<6000u.The optimal pH value for coagulation-ultrafiltration process i s 7,and sweeping coagulation can make small molecular organic matter agglomerate d into microflocs,which results in the reduction of membrane pore fouling and makes the ultrafiltration kept at high permeation flux. Keywords:coagulation;ultrafiltration;sweeping;permeation flux
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