Impacts of Phosphorous Source on Organic Acid Production and Heterotrophic Bioleaching of Rare Earth Elements and Base Metals from Spent Nickel-Metal-Hydride Batteries
| Autor: | Payam Rasoulnia, Aino-Maija Lakaniemi, Kati Valtonen, Robert Barthen |
|---|---|
| Přispěvatelé: | Tampere University, Materials Science and Environmental Engineering |
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Streptomyces pilosus Environmental Engineering 218 Environmental engineering Renewable Energy Sustainability and the Environment 215 Chemical engineering 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Metal chemistry.chemical_compound chemistry Bioleaching visual_art Environmental chemistry Gluconic acid visual_art.visual_art_medium Leaching (metallurgy) 0210 nano-technology Waste Management and Disposal Gluconobacter oxydans Base metal 0105 earth and related environmental sciences Organic acid |
| Zdroj: | Waste and Biomass Valorization. 12:5545-5559 |
| ISSN: | 1877-265X 1877-2641 |
| Popis: | This study investigated heterotrophic bioleaching of rare earth elements (REEs) and base metals from spent nickel-metal-hydride (NiMH) batteries. Furthermore, the impacts of phosphorous source [Ca3(PO4)2, KH2PO4 and K2HPO4] and its concentration on organic acid production by Gluconobacter oxydans and Streptomyces pilosus were evaluated. Phosphorous source affected microbial acid production and metal leaching. Among the studied phosphorous sources, use of K2HPO4 resulted in highest organic acid production by both bacteria. Increasing K2HPO4 concentration from 2.7 to 27 mM enhanced pyruvic acid production by S. pilosus from 2.2 to 10.7 mM. However, no metal was leached from the spent NiMH batteries with S. pilosus using either one-step, two-step or spent-medium bioleaching. With G. oxydans, highest gluconic acid concentration of 45.0 mM was produced at the lowest K2HPO4 concentration of 2.7 mM. When using two-step bioleaching with G. oxydans, higher leaching efficiencies were obtained for base metals (88.0% vs. 68.0% Fe, 41.5% vs. 35.5% Co, 18.5% vs 16.5% Ni), while more REEs were leached using spent-medium bioleaching (9.0% vs. 6.0% total REEs). With both bioleaching methods, base metals leaching was faster than that of REEs. Surplus of phosphorous should be avoided in bioleaching cultures as precipitation especially with REEs is possible. Graphic Abstract |
| Databáze: | OpenAIRE |
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