AI Article Synopsis
- The study investigates how indigenous bacteria can break down phosphogypsum (PG) when given the right nutrients, focusing on the mechanisms of biotransformation.
- Seven multi-metal-resistant bacterial strains were isolated and characterized, showing strong heavy metal uptake and the ability to degrade PG.
- The bacterial consortium not only transformed PG from acidic to alkaline but also helped in carbon dioxide sequestration by producing key enzymes like carbonic anhydrase and urease.
Article Abstract
Aims: This study continues our previous investigation of the intrinsic degradation of phosphogypsum (PG) by indigenous microorganisms on amending adequate nutrients. We aim to unravel the intricate mechanisms involved in PG biotransformation by a bacterial consortium.
Methods And Results: We isolated and characterized seven multi-metal-resistant bacterial strains from a nutrient-amended PG-contaminated microcosm and identified them through 16S rRNA gene sequencing. Primarily aerobic, Gram-positive chemolithotrophs, these strains demonstrated significant heavy metal uptake and PG degradation potential. Further analysis revealed that all strains produced carbonic anhydrase (CA), while six also produced urease, which may facilitate microbial-induced carbonate precipitation. Microstructural and elemental analysis using scanning electron microscopy-energy-dispersive X-ray and X-Ray Diffraction (XRD) confirmed the PG bio-transformation, indicating substantial increases in carbonate concentrations and reductions in sulfate levels.
Conclusions: The consortium, composed of seven urease- and CA-producing bacterial strains, effectively degraded PG, transforming it from an acidic to an alkaline state and significantly enhancing CO2 sequestration.
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| http://dx.doi.org/10.1093/jambio/lxae277 | DOI Listing |
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