Effect of different phosphate sources on uranium biomineralization by the Microbacterium sp. Be9 strain: A multidisciplinary approach study
Metadatos
Mostrar el registro completo del ítemAutor
Martínez Rodríguez, Pablo; Sánchez Castro, Iván; Abad Ortega, María del Mar; Merroun, Mohamed LarbiEditorial
Frontiers
Materia
Microbacterium Uranium Phosphate source Bioprecipitation Solubilization PSB
Fecha
2023-01-09Referencia bibliográfica
Martínez-Rodríguez P... [et al.] (2023) Effect of different phosphate sources on uranium biomineralization by the Microbacterium sp. Be9 strain: A multidisciplinary approach study. Front. Microbiol. 13:1092184. doi: [10.3389/fmicb.2022.1092184]
Patrocinador
ORANO Mining (France; collaborative research contract no 3022 OTRI-UGR)Resumen
Introduction: Industrial activities related with the uranium industry are
known to generate hazardous waste which must be managed adequately.
Amongst the remediation activities available, eco-friendly strategies based
on microbial activity have been investigated in depth in the last decades and
biomineralization-based methods, mediated by microbial enzymes (e.g.,
phosphatase), have been proposed as a promising approach. However, the
presence of different forms of phosphates in these environments plays a
complicated role which must be thoroughly unraveled to optimize results
when applying this remediation process.
Methods: In this study, we have looked at the effect of different phosphate sources
on the uranium (U) biomineralization process mediated by Microbacterium
sp. Be9, a bacterial strain previously isolated from U mill tailings. We applied a
multidisciplinary approach (cell surface characterization, phosphatase activity,
inorganic phosphate release, cell viability, microscopy, etc.).
Results and Discussion: It was clear that the U removal ability and related
U interaction mechanisms by the strain depend on the type of phosphate
substrate. In the absence of exogenous phosphate substrate, the cells interact
with U through U phosphate biomineralization with a 98% removal of U within
the first 48 h. However, the U solubilization process was the main U interaction
mechanism of the cells in the presence of inorganic phosphate, demonstrating
the phosphate solubilizing potential of the strain. These findings show the
biotechnological use of this strain in the bioremediation of U as a function
of phosphate substrate: U biomineralization (in a phosphate free system) and
indirectly through the solubilization of orthophosphate from phosphate (P)
containing waste products needed for U precipitation.