Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 481, Issue -, Pages 476-484Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2015.06.017
Keywords
Polyamidine; Aluminum sulfate; Coagulation performance; Floc properties
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In this study, novel cationic polyamidine (Pa) was synthesized and used as coagulant aid with aluminum sulfate (AS) for kaolin-humic acid simulated water treatment. The effects of Pa on coagulation performance and floc properties were investigated. Results showed that Pa addition significantly enhanced the removal of turbidity, ultraviolet absorbance at 254 nm wavelength (UV254) and dissolved organic carbon (DOC). AS-Pa exhibited high coagulation efficiency at border pH range and increased floc size and growth rate significantly. Floc recovery ability was also improved, while floc fractal dimension was lower with Pa addition. This would be attributed to high cationic charge density and long chain of Pa, which could enhance the effect of charge neutralization and adsorption bridging. (C) 2015 Elsevier B.V. All rights reserved.
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