2021
DOI: 10.1007/s12649-021-01398-x
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Impacts of Phosphorous Source on Organic Acid Production and Heterotrophic Bioleaching of Rare Earth Elements and Base Metals from Spent Nickel-Metal-Hydride Batteries

Abstract: 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 bo… Show more

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Cited by 22 publications
(4 citation statements)
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“…According to Table 3 , the optimum pH value is 2 or less, which leads to the proper oxidation of iron or sulfide ions and enhances the activities of microbes in the bioleaching process of aimed metals. 66 In fungal species, carbon sources such as sucrose and glucose are the main factors affecting organic acid production and lead to better recovery of heavy metals; 67 therefore, with optimization of this factor, metal's recovery as a response reaches its optimum rate. Fe 3+ + H 2 O → Fe(OH) 2+ + H + Fe 3+ + 2H 2 O → Fe(OH) 2 + + 2H + Fe 3+ + 3H 2 O → Fe(OH) 3 + 3H + …”
Section: Application Of Rsm In Bioleaching Processesmentioning
confidence: 99%
“…According to Table 3 , the optimum pH value is 2 or less, which leads to the proper oxidation of iron or sulfide ions and enhances the activities of microbes in the bioleaching process of aimed metals. 66 In fungal species, carbon sources such as sucrose and glucose are the main factors affecting organic acid production and lead to better recovery of heavy metals; 67 therefore, with optimization of this factor, metal's recovery as a response reaches its optimum rate. Fe 3+ + H 2 O → Fe(OH) 2+ + H + Fe 3+ + 2H 2 O → Fe(OH) 2 + + 2H + Fe 3+ + 3H 2 O → Fe(OH) 3 + 3H + …”
Section: Application Of Rsm In Bioleaching Processesmentioning
confidence: 99%
“…In all bioleaching set-ups, pH tended to have neutral/slightly alkaline values. The fact is that WPCBs have an alkaline nature resulting in the release of alkaline compounds (Rasoulnia et al, 2021). Since heterotrophic bacteria produce organic acid due to carbon consumption, this leads to a decrease in the medium pH (Feliatra et al, 2019;Mei et al, 2021).…”
Section: Bioleaching Experimentsmentioning
confidence: 99%
“…These batteries may contain up to 8–10% (w/w) Ln, thus being a relevant source of CRMs. These species need to be recovered with high purity from other metals, for instance, up to 36–42% (w/w) Ni, 25% (w/w) Fe, and 4% (w/w) Co, and conventional approaches rely on pyrometallurgical, hydrometallurgical, , and biometallurgical processes.…”
Section: Introductionmentioning
confidence: 99%