The Coagulation Performance and Floc Characteristics of Yellow River Reservoir Water Coagulated by Composite Coagulant Prepared by Polymeric Aluminum Ferric Chloride and Polydimethyl Diallylammonium Chloride

Xiang Zuo Li; Yan Wang; Shuang Zhao

doi:10.4028/www.scientific.net/AMR.518-523.533

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The Coagulation Performance and Floc Characteristics of Yellow River Reservoir Water Coagulated by Composite Coagulant Prepared by Polymeric Aluminum Ferric Chloride and Polydimethyl Diallylammonium Chloride

Abstract:

In this paper, inorganic polymeric ferric aluminum chloride (PFAC) and composite polymeric aluminum ferric chloride polydimethyl diallylammonium chloride (PFAC-PDADMAC) were applied for the coagulation treatment of Yellow River reservoir water. The coagulation efficiency of PFAC-PDADMAC for reservoir water treatment was investigated at different weight ratios (Ferric and Aluminum to PDADMAC, Wr=2, 4 and 8). During coagulation, the size distribution, breakage factor (Bf) and recovery factor (Rf) of flocs was investigated to systemically estimate the floc characteristics of PFAC-PDADMAC coagulation system. It was confirmed that coagulation performance of PFAC-PDADMAC was better than that of PFAC when Wr and dosage were 4 and 8 mg/L, respectively for Yellow River reservoir water coagulation. Although they were more sensitive to external interference, the flocs formed by PFAC-PDADMAC coagulation system had bigger size, faster growth rate and stronger re-growth capability than that by PFAC coagulation system. At Wr=4, the floc size and growth rate of flocs by PFAC-PDMDAAC coagulation were 409μm and 54 μm/min, respectively.