Electronic scraps (e-scraps) represent an attractive raw material to mine demanded metals, as well as rare earth elements (REEs). A sequential microbial-mediated process developed in two steps was examined to recover multiple elements. First, we made use of an acidophilic bacteria consortium, mainly composed of Acidiphilium multivorum and Leptospidillum ferriphilum, isolated from acid mine drainages. The consortium was inoculated in a dissolution of e-scraps powder and cultured for 15 days. Forty-five elements were analyzed in the liquid phase over time, including silver, gold, and 15 REEs. The bioleaching efficiencies of the consortium were >99% for Cu, Co, Al, and Zn, 53% for Cd, and around 10% for Cr and Li on Day 7. The second step consisted of a microalgae-mediated uptake from e-scraps leachate. The strains used were two acidophilic extremotolerant microalgae, Euglena sp. (EugVP) and Chlamydomonas sp. (ChlSG) strains, isolated from the same extreme environment. Up to 7.3, 4.1, 1.3, and 0.7 µg by wet biomass (WB) of Zn, Al, Cu, and Mn, respectively, were uptaken by ChlSG biomass in 12 days, presenting higher efficiency than EugVP. Concerning REEs, ChlSG biouptake 14.9, 20.3, 13.7, 8.3 ng of Gd, Pr, Ce, La per WB. Meanwhile, EugVP captured 1.1, 1.5, 1.4, and 7.5, respectively. This paper shows the potential of a microbial sequential process to revalorize e-scraps and recover metals and REEs, harnessing extremotolerant microorganisms.
Bibliographical noteFunding Information:
This work was supported by the Fundación Alfonso Martín Escudero Postdoctoral Grant (number 2048) awarded to B.B.C. Authors want to acknowledge the analytical services of the Centro Analítico Integral (CAI), geological techniques research support center of the Complutense University of Madrid for their support in the chemical and SEM analyses. We acknowledge the company LYRSA‐Derichebourg for the support of the present research as the supplier of the scrap material from their production process.
This work was supported by the Fundaci?n Alfonso Mart?n Escudero Postdoctoral Grant (number 2048) awarded to B.B.C. Authors want to acknowledge the analytical services of the Centro Anal?tico Integral (CAI), geological techniques research support center of the Complutense University of Madrid for their support in the chemical and SEM analyses. We acknowledge the company LYRSA-Derichebourg for the support of the present research as the supplier of the scrap material from their production process.
© 2022 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.
PubMed: MeSH publication types
- Journal Article
- Research Support, Non-U.S. Gov't
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Supplemental Data; "Microbial biominers: sequential bioleaching and biouptake of metals from e-scraps"
García-Balboa, C., Martínez-Alesón García, P., López-Rodas, V., Costas, E. & Baselga Cervera, B., ZENODO, 2022