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Water 2018, 10(9), 1215; https://doi.org/10.3390/w10091215

Inhibition of Cationic Polymer-Induced Colloid Flocculation by Polyacrylic Acid

1
Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8572, Japan
2
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8572, Japan
*
Author to whom correspondence should be addressed.
Received: 31 July 2018 / Revised: 29 August 2018 / Accepted: 6 September 2018 / Published: 8 September 2018
(This article belongs to the Section Water and Wastewater Treatment)
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Abstract

Although the dosage of cationic flocculants used for water treatment is well known to increase in the presence of natural organic matter (NOM), the underlying reasons for this increase are not properly understood. Herein, we studied the flocculation behavior of polystyrene latex (PSL) particles in the presence and absence of polyacrylic acid (PAA5K) as an NOM analogue using an end-over-end rotation apparatus for standardized flow mixing. In the absence of PAA5K, the initial rate of cationic flocculant (PAM5M)-induced flocculation was enhanced, as reflected by the size of flocculant in solution. Additionally, flocculation experiments were performed in the presence of 0.5 mg/L PAA5K for five concentrations of PAM5M and two ionic strengths, and the increase of the initial rate of PAM5M-induced flocculation was suppressed by PAA5K immediately after mixing, with the most pronounced suppression obtained at a PAM5M concentration similar to PAA5K. Based on the above insights and the results of viscosity measurements, the inhibitory effect of PAA on flocculation was ascribed to (1) the reduction of PAM charge and the concomitant shrinkage via electrostatic association with PAA and (2) the termination of polycation adsorption on PSL caused by polyion complex formation when the charge ratio of PAM:PAA is close to unity. View Full-Text
Keywords: polymer flocculation; polystyrene latex; initial flocculation rate; cationic polyelectrolyte; inhibition of flocculation by natural organic matter polymer flocculation; polystyrene latex; initial flocculation rate; cationic polyelectrolyte; inhibition of flocculation by natural organic matter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Lim, V.H.; Yamashita, Y.; Doan, Y.T.H.; Adachi, Y. Inhibition of Cationic Polymer-Induced Colloid Flocculation by Polyacrylic Acid. Water 2018, 10, 1215.

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