In recent years, critical and secondary raw materials (CRMs and SRMs, respectively)have received great interest within the circular economy model. In this work, the mycorrhizalassistedphytomining (MAP) system, composed of Helianthus annuus-arbuscular mycorrhizal fungusRhizophagus intraradices-Zn-volcanic ashes, was applied in bioreactors for the recovery of CRMs (Sr,P) and SRMs (Cr, Zn, Cu, Mn, Rb, Ni) from mining wastes of the Los Cóndores mine (Argentina).Our results showed high bioaccumulation of Sr, P, Mn, and Zn in the aerial tissues, and a high rootto-shoot translocation for Mn (4.02) > Sr > P > Rb > Zn (0.84). Mycorrhization treatment increasedthe root-to-leaf translocation for Cr and P and prevented translocation towards flower tissues inmost elements. The estimated bioextracting potential of the MAP system (290 plants) in a vegetabledepuration module (VDM) ranged from 158 mg/m3 P > Zn > Mn > 15.1 mg/m3 Sr. We demonstrateda promising and cost-effective biotechnology applicable in agronomical practices, given the exclusionof toxic elements in flower parts, as well as for the recovery of CRMs and SRMs by hydrometallurgyfrom plant biomass.
The role of Mycorrhizal-Assisted Phytomining in the recovery of raw materials from mine wastes
Stefano Ubaldini
2022
Abstract
In recent years, critical and secondary raw materials (CRMs and SRMs, respectively)have received great interest within the circular economy model. In this work, the mycorrhizalassistedphytomining (MAP) system, composed of Helianthus annuus-arbuscular mycorrhizal fungusRhizophagus intraradices-Zn-volcanic ashes, was applied in bioreactors for the recovery of CRMs (Sr,P) and SRMs (Cr, Zn, Cu, Mn, Rb, Ni) from mining wastes of the Los Cóndores mine (Argentina).Our results showed high bioaccumulation of Sr, P, Mn, and Zn in the aerial tissues, and a high rootto-shoot translocation for Mn (4.02) > Sr > P > Rb > Zn (0.84). Mycorrhization treatment increasedthe root-to-leaf translocation for Cr and P and prevented translocation towards flower tissues inmost elements. The estimated bioextracting potential of the MAP system (290 plants) in a vegetabledepuration module (VDM) ranged from 158 mg/m3 P > Zn > Mn > 15.1 mg/m3 Sr. We demonstrateda promising and cost-effective biotechnology applicable in agronomical practices, given the exclusionof toxic elements in flower parts, as well as for the recovery of CRMs and SRMs by hydrometallurgyfrom plant biomass.| File | Dimensione | Formato | |
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