Abstract
With the gradual depletion of high-grade copper ore deposits, secondary wastes are gaining importance as a source for metal recovery. However, the alkalinity and low copper concentration in some of these resources underscore the need for selective leaching agents. In this work, indigenous alkaliphiles from a fly ash landfill site with inherent pH tolerance, metal tolerance and copper leaching capability were isolated and investigated. Four isolates, namely Agromyces aurantiacus TRTYP3, Alkalibacterium pelagium TRTYP5, Alkalibacterium sp. TRTYP6 and Bacillus foraminis TRTYP17, each selectively leached about 50 % copper from 1 % (w/v) of fly ash. Mixed culture of these bacteria resulted in higher leaching of copper. The optimal combination was TRTYP3, TRTYP5, TRTYP6 and TRTYP17 in the ratio 1:1:3:1, which leached 88, 81, 78, 76, 70 and 55 % Cu from 1, 2.5, 5, 10, 15 and 20 % (w/v) of fly ash. While Cu and Pb were bioleached into solution, Fe and Zn were precipitated.
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Highlights
1. Isolates from Agromyces, Alkalibacterium and Bacillus genera used for bioleaching
2. Selective recovery of ∼50 % copper achieved with pure cultures
3. Mixed culture of the isolates leached close to 90 % copper
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Ramanathan, T., Ting, YP. Selective Copper Bioleaching by Pure and Mixed Cultures of Alkaliphilic Bacteria Isolated from a Fly Ash Landfill Site. Water Air Soil Pollut 226, 374 (2015). https://doi.org/10.1007/s11270-015-2641-x
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DOI: https://doi.org/10.1007/s11270-015-2641-x