Water Practice and Technology (Apr 2021)
The removal of pollutants and natural organic compounds from acid mine drainage using a combination of bentonite clay and MgSO4
Abstract
200 mL of synthetic acid mine drainage (AMD) sample was poured into five 500 mL glass beakers and treated in a jar test and a shaker in sets of experiments, respectively. The samples were treated in small-scale laboratory experiments using synthetic AMD sample dosed with bentonite clay and MgSO4 respectively, and a flocculant consisting of the same reagents. The pH, EC, turbidity and oxidation reduction potential were measured. The removal of turbid materials in the samples dosed with a flocculant is higher compared to those of the samples dosed with each reagent alone. The samples with flocculant dosage show high removal efficiency of natural organic compounds and toxic metals, slightly higher compared to those with a dosage of a combination of bentonite clay and MgSO4. The removal efficiency of the samples treated in a shaker is better than those with rapid mixing. The SEM micrographs show sorption is a physico-chemical phenomenon. Highlights Removal efficiency of MgSO4 in combination with bentonite clay.; Removal efficiency of NOM using a flocculant.; Efficiency of the flocculant on acidic wastewater.; Treatment of AMD without pH adjustment.; Comparison of turbidity removal using mixing and shaking mechanisms.;
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