Control of micro and nano flocs with coagulation pretreatmentprevention of membrane fouling

来源 :The IWA Conference on Pretreatment of Water and Wastewater(国 | 被引量 : 0次 | 上传用户:zhangliu2009
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  To reduce membrane fouling problem,coagulation is proposed as a pretreatment process to remove dissolved organic matters and colloids(<1μm)in raw water.However,appropriate coagulation conditions for precipitation process might not lead to optimum membrane filtration performance.Coagulation process,influenced by pH,coagulant categories and dose,and etc.,produces micro-sized flocs(>1μm)by neutralizing particles surface charge or forming sweep flocs.Nevertheless,many studies reported that the behaviour of nano-sized flocs(<0.2μm),which is thought to be the main foulants,was different from that of micro-sized flocs under same condition.
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