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http://dx.doi.org/10.7844/kirr.2021.30.3.30

Influence of Bacterial Attachment on Arsenic Bioleaching from Mine Tailings: Dependency on the Ratio of Bacteria-Solid Substrate  

Park, Jeonghyun (Department of Mineral Resources and Energy Engineering, Jeonbuk National University)
Silva, Rene A. (Department of Mineral Resources and Energy Engineering, Jeonbuk National University)
Choi, Sowon (Department of Environment and Energy, Jeonbuk National University)
Ilyas, Sadia (Department of Mineral Resources and Energy Engineering, Jeonbuk National University)
Kim, Hyunjung (Department of Mineral Resources and Energy Engineering, Jeonbuk National University)
Publication Information
Resources Recycling / v.30, no.3, 2021 , pp. 30-40 More about this Journal
Abstract
The present study investigates the bioleaching efficiencies of arsenic via contact and non-contact mechanisms. The attachment of Acidithiobacillus ferrooxidans was restricted by a partition system comprising a semi-permeable membrane with a molecular weight cutoff of 12-14 kDa. The results were compared for two arsenic concentrations in the system (1.0% and 0.5% w/v) to maintain a homogeneous system. The overall bacterial performance was monitored by comparing total arsenic and iron concentrations, Fe ion speciation, pH, and solution redox potentials in flask bioleaching experiments over a period of 10 d. Our results indicated that bacterial attachment could increase arsenic extraction efficiency from 20.0% to 44.9% at 1.0 % solid concentrations. These findings suggest that the bacterial contact mechanism greatly influences arsenic bioleaching from mine tailings. Therefore, systems involving two-step or non-contact bioleaching are less effective than those involving one-step or contact bioleaching for the efficient extraction of arsenic from mine tailings.
Keywords
Bioleaching; arsenic removal; Acidithiobacillus ferrooxidans; solid concentration; bacterial attachment;
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