Enhanced Coagulation of Titanium Tetrachloride Aided by the Modified Compound Bioflocculant
Publication: Journal of Environmental Engineering
Volume 141, Issue 9
Abstract
The compound bioflocculant (CBF) was modified by graft copolymerization of acrylic amide and dimethyl diallyl ammonium chloride, and the novel copolymer was denoted as MCBF. The effect of MCBF used as coagulant aid with titanium tetrachloride () was investigated for both high and low molecule weight natural organic matter (NOM) removal. Floc characteristics were studied using a laser diffraction particle-sizing device. Results indicated that the monomers were successfully grafted onto the CBF, and the molecule weight and zeta potential of CBF were greatly improved. The MCBF with exhibited synergistic effect by promoting NOM removal, especially at low doses. Additionally, using MCBF as a coagulant aid with can significantly increase the floc growth rate, size, strength, and broken-floc recoverability. The effect of MCBF on fractal dimension of flocs generated by depended on NOM properties. Both coagulation performance and floc properties were significantly affected by dosing sequence.
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Acknowledgments
This work was supported by grants from the Chinese National Natural Science Foundation (No. 51278283), China Postdoctoral Science Foundation (2014M560557), and Australia Research Council Discovery Projects (ARC DP130103129).
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 9 • September 2015
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© 2015 American Society of Civil Engineers.
History
Received: Apr 13, 2014
Accepted: Dec 9, 2014
Published online: Feb 24, 2015
Discussion open until: Jul 24, 2015
Published in print: Sep 1, 2015
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