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Polyamidine as a New-Style Coagulant Aid for Dye Wastewater Treatment and its Floc Characteristics

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Abstract:

Polyamidine (PA) is a novel high cation coagulant aid for water treatment. In the present study the structure, coagulation ability and floc characteristics (including coagulation kinetics, floc dimension, floc strength and floc recover ability) were discussed. As a dual-coagulation, polyamidine was combined with AlCl3 and PAC to remove dispersed yellow from wastewater. The results showed that the polyamidine exhibited higher intrinsic viscosity and higher charge neutralization ability than cationic polyacrylamide (PAM). Atomic force microscopic (AFM) and transmission electronic microscopic (TEM) images showed a dendritic, stretched structure of PA. The dosage of PAC/PA and AlCl3/PA and pH were investigated and optimized. Under the optimum condition, the color removal efficiency reached 96% as the concentration of 14/0.2 mg/L for AlCl3/PA (PA was combined with AlCl3) at pH 6. Meanwhile, the highest decoloring efficiency (97%) was achieved in the process when PAC/PA (PA was combined with PAC) dosage was 18/0.6 mg/L at pH 6.0-8.0. The addition of polyamidine could improve the color removal efficiency, including increasing the zeta potential evidently and reducing the aluminum coagulants dosage as well. Compared with AlCl3/PA, PAC/PA which contained higher polymeric aluminum, exhibited a better coagulation ability to adapt a wide range of pH. However, when PAC/PA and AlCl3/PA expressed the same removal efficiency, AlCl3/PA showed a less coagulant dosage in raw dye wastewater pH. With PA dosages increased, the floc of AlCl3/PA showed a gradually adding strength and recovery ability, but in PAC/PA system the tendency was unclear. In PAC/PA system, PA dosage increase only improved floc density.

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Periodical:

Materials Science Forum (Volume 913)

Pages:

930-940

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.913.930

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Online since:

February 2018

Authors:

Mo Xi Xue, Bao Yu Gao*, Xing Xu, Wen Song

Keywords:

Aluminum Chloride, Aluminum Polychlorid, Coagulation, Polyamidine

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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