东江水源水有机物分子量分布及其处理工艺选择

韩瑾; 李星; 杨艳玲; 李凯; 李圭白

东江水源水有机物分子量分布及其处理工艺选择

Organic Matter Molecular Weight Distribution and Process Selection for the Raw Water of East River

摘要

摘要: 首先采用超滤膜法考察了泄洪时期东江水源水中有机物分子量分布特点,进而考察了常规混凝沉淀、粉末活性炭(PAC)吸附-混凝沉淀、高锰酸钾(KMnO₄)预氧化+PAC吸附-混凝沉淀等工艺对东江水中不同分子量有机物的去除效果.结果表明,泄洪时,东江水源水中溶解性有机物(DOM)分子量主要集中在3 000以上,其中3 000~10 000和>10 000的有机物分别占30.8%和43.2%;连续流动态试验结果表明:常规混凝沉淀工艺主要去除分子量>10 000的有机物.KMnO₄与PAC联用能发挥二者的协同作用,能提高对各分子量区间的有机物去除效果.KMnO₄预氧化+PAC吸附-混凝沉淀工艺(KMnO₄投量1.0 mg/L、PAC投量60 mg/L)对溶解性有机碳(DOC)的去除率为84.0%,比常规混凝沉淀工艺提高了54.2%.KMnO₄预氧化+PAC吸附工艺可作为东江沿岸水厂应对泄洪期水质恶化的一种有效应急处理工艺.

Abstract: The DOM removal efficiency of the East River treatment with the process of conventional coagulation-sedimentation,PAC pre-adsorption coagulation-sedimentation,KMnO₄ pre-oxidation and PAC pre-adsorption coagulation-sedimentation was investigated in terms of molecular weight distribution.The result showed that,the DOC of the East River raw water in flood period was mainly 3 000-10 000 and >10 000,which proportion was 30.8% and 43.2%,respectively.The results of continuous flow dynamic experiment showed that conventional coagulation sedimentation process mainly removed organic matter which molecular weight was more than 10 000.KMnO₄ pre-oxidation and PAC pre-adsorption coagulation-sedimentation process could improve organic matter removal rate of each molecular weight.The DOC removal rate of KMnO₄ pre-oxidation and PAC pre-adsorption coagulation-sedimentation process was 84.0%.The removal rate raised 54.2% compared with conventional coagulation process.KMnO₄ pre-oxidation and PAC pre-adsorption coagulation-sedimentation process can enhance the removal rate of DOM effectively.

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