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Utilisation of acid-tolerant bacteria for base metal recovery under strongly acidic conditions.
- Source :
-
Extremophiles . Dec2024, Vol. 28 Issue 3, p1-9. 9p. - Publication Year :
- 2024
-
Abstract
- Hydrometallurgical bioprocesses for base metal recovery in environmentally friendly electronic device waste (e-waste) recycling are typically studied under neutral pH conditions to avoid competition between metals and hydrogen ions. However, metal leachate is generally strongly acidic, thus necessitating a neutralisation process in the application of these bioprocesses to e-waste recycling. To solve this pH disparity, we focused on acid-tolerant bacteria for metal recovery under strongly acidic conditions. Four acid-tolerant bacterial strains were isolated from neutral pH environments to recover base metals from simulated waste metal leachate (pH 1.5, containing 100 or 1000 mg L−1 of Co, Cu, Li, Mn, and Ni) without neutralisation. The laboratory setting for sequential metal recovery was established using these strains and a reported metal-adsorbing bacterium, Micrococcus luteus JCM1464. The metal species were successfully recovered from 100 mg L−1 metal mixtures at the following rates: Co (8.95%), Cu (21.23%), Li (5.49%), Mn (13.18%), and Ni (9.91%). From 1000 mg L−1 metal mixtures, Co (7.23%), Cu (6.82%), Li (5.85%), Mn (7.64%), and Ni (7.52%) were recovered. These results indicated the amenability of acid-tolerant bacteria to environmentally friendly base metal recycling, contributing to the development of novel industrial application of the beneficial but unutilised bioresource comprising acid-tolerant bacteria. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14310651
- Volume :
- 28
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Extremophiles
- Publication Type :
- Academic Journal
- Accession number :
- 179915619
- Full Text :
- https://doi.org/10.1007/s00792-024-01362-2