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dc.contributor.authorNtwampe, I.O.
dc.contributor.authorWaanders, F.B.
dc.contributor.authorBunt, J.R.
dc.identifier.citationNtwampe, I.O. et al. 2016. Destabilization dynamics of clay and acid-free polymers of ferric and magnesium salts in AMD without pH adjustment. Water science & technology, 74(4):861-875. []en_US
dc.identifier.issn1996-9732 (Online)
dc.description.abstractThe physicochemical treatment was employed to treat acid mine drainage (AMD) in the removal of turbid materials using clay only (exp A) and a combination of clay, FeCl3 and Mg(OH)2 (exp B) to form a polymer. A 5 g sample of clay (bentonite) was added to 1.2 L of AMD and treated in a jar test at 250 rpm for 2 min and reduced to 100 rpm for 10 min. A 200 mL sub-sample from the 1.2 L mother liquor was poured into five 500 mL glass beakers, and 20 mL dosages of a polymer of 0.1 M Fe3+ in (FeCl3) and 0.1 M Mg2+ in (Mg(OH)2) was added to the beakers. The samples were allowed to settle for 1 h, after which the supernatant was analyzed for pH, total suspended solids (TSS), dissolved oxygen (DO) and oxidation-reduction potential (ORP) (exp A). A similar set of experiments was conducted where 200 mL of the AMD sample was poured into 500 mL glass beakers and (20–60 mL) dosages of a combination of 5 g clay, 0.1 M Fe3+ (FeCl3) and Mg2+ (Mg(OH)2) polymer was added and similar mixing, settling time and measurements were conducted (exp B). The polymers used in exp A exhibited TSS removal efficiency (E%) which was slightly lower compared with the polymer used in exp B, above 90%. Clay has a high TSS removal efficiency in the treatment of the AMD, indicating that adsorption was a predominant process in exps A and B. The scanning electron microscope (SEM) micrographs of the AMD sludge of both exps A and B, with a rigid and compacted structure consisting of dense flocs surrounded by the smaller flocs bound together, corroborate the fact that adsorption is a predominant processen_US
dc.publisherIWA Publishingen_US
dc.titleDestabilization dynamics of clay and acid-free polymers of ferric and magnesium salts in AMD without pH adjustmenten_US
dc.contributor.researchID10059571 - Waanders, Frans Boudewijn
dc.contributor.researchID20164200 - Bunt, John Reginald
dc.contributor.researchID26225239 - Ntwampe, Irvin

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