Abstract
Abstract In this study, new composite flocculants were prepared from iron salts and polydimethyldiallylammonium chloride (PDMDAAC). The Fe(III) species and zeta potential of the composite poly-ferric chloride (PFC) and PDMDAAC flocculant (PFC–PDMDAAC) and PFC were measured by a timed complexation spectroscopy method and the Malvern Zetasizer 3000, respectively. The results showed that when PDMDAAC fraction (Wp) was 7.0%, PFC–PDMDAAC contained the smallest content of Fe c and had the highest zeta potential. The flocculation efficiency of PFC–PDMDAAC and the composite FeCl 3 and PDMDAAC flocculant (FeCl 3 –PDMDAAC) for treating actual surface water or wastewater samples was compared with that of FeCl 3 , PFC and PDMDAAC. The results showed that for surface water from Yellow River, PFC–PDMDAAC produced the highest flocculation efficiency, while for papermaking intermediate wastewater, the flocculation efficiency of FeCl 3 –PDMDAAC was the highest.
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