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Ecofriendly Flocculation of Bentonite Suspensions by Two Anionic Polysaccharides: Carboxylated Chitosan (CC) and Sodium Carboxymethyl Starch (CMS-Na)
Abstract:
Growing demand for ecofriendly technologies promotes the interest in investigation of natural flocculants and their derivatization aimed to dewatering of colloidal stable clay suspensions in a low energy consumption and environmentally friendly way. The present work used two negatively charged polysaccharides carboxylated chitosan (CC) and sodium carboxymethyl starch (CMS-Na) as flocculants and bentonite as colloidal particles system to study the influence of their charge characteristics on flocculation efficacy. Flocculation studies between negatively charged polysaccharides and negatively charged bentonite colloidal particles were systematically investigated through standard jar test procedure and laser light scattering measurements. It was found that the investigated negatively charged polysaccharides showed high flocculation performance for bentonite suspensions at less amount anionic polysaccharides doses but obvious deteriorative performance even antiflocculation process appeared at large amount anionic polysaccharides dosage.
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321-325
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Online since:
June 2014
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© 2014 Trans Tech Publications Ltd. All Rights Reserved
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