Microbial interactions with uranium: Towards an effective bioremediation approach

Banala, Uday Kumar; Das, Nilamadhab Prasad Indradyumna; Toleti, Subba Rao

doi:10.1016/j.eti.2020.101254

Cited by 61 publications

(19 citation statements)

References 172 publications

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“…In such environments, U can undergo (i) rapid biosorption to organic matter with the help of ligands produced by certain bacteria 189 and fungi; 190 (ii) bioreduction from U(VI) to U(IV) resulting in precipitation of uraninite under anaerobic conditions; 158,159,165,166 and (iii) biomineralization to uranyl phosphates if dissolved phosphate was available. 191 Additionally, microbes can form biofilms on mineral surfaces and serve as nucleation sites for minerals such as Fe oxides, 192,193 carbonates, 193 or even U minerals, 194 which may impact the U fate. The extent and influence of these mechanisms in high DOC waters, such as in Nadia (West Bengal), could not be quantified using classical thermodynamics, limiting the applicability of the present model.…”

Section: Environmentalmentioning

confidence: 99%

Investigation of Potential Drivers of Elevated Uranium Prevalence in Indian Groundwaters with a Unified Speciation Model

Sujathan

Singh

2023

Environ. Sci. Technol.

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Elevated uranium (U) (>WHO limit of 30 μg L −1 ) in Indian groundwaters is primarily considered geogenic, but the specific mineralogical sources and mechanisms for U mobilization are poorly understood. In this contribution, statistical and geochemical analyses of well-constrained metadata of Indian groundwater quality (n = 342 of 8543) were performed to identify key parameters and processes that influence U concentrations. For geochemical predictions, a unified speciation model was developed from a carefully compiled and updated thermodynamic database of inorganic, organic (Stockholm Humic model), and surface complexation reactions and associated constants. Critical U contamination was found at shallow depths (<100 m) within the Indo-Gangetic plain, as determined by bivariate nonparametric Kendall's Tau b and probability-based association tests. Analysis of aquifer redox states, multivariate hierarchical clusters, and principal components indicated that U contamination was predominant not just in oxic but mixed (oxic−anoxic) aquifers under high Fe, Mn, and SO 4 concentrations, presumably due to U release from dissolution of Fe/Mn oxides or Fe sulfides and silicate weathering. Most groundwaters were undersaturated with respect to relevant U-bearing solids despite being supersaturated with respect to atmospheric CO 2 (average pCO 2 of reported dissolved inorganic carbonate (DIC) data = 10 −1.57 atm). Yet, dissolved U did not appear to be mass limited, as predicted solubilities from reported sediment concentrations of U were ∼3 orders of magnitude higher. Integration of surface complexation models of U on typical aquifer adsorbents, ferrihydrite, goethite, and manganese dioxide, was necessary to explain dissolved U concentrations. Uranium contamination probabilities with increasing dissolved Ca and Mn exhibited minima at equilibrium solubilities of calcite [∼50 mg L −1 ] and rhodochrosite [∼0.14 mg L −1 ], respectively, at an average groundwater pH of ∼7.5. A potential indirect control of such U-free carbonate solids on U mobilization was suggested. For locations (n = 37) where dissolved organic carbon was also reported, organic complexes of U contributed negligibly to dominant U speciation at the groundwater pH. Overall, the unified model suggested competitive dissolution−precipitation and adsorption−desorption controls on U speciation. The model provides a quantitative framework that can be extended to understand dominant mobilization mechanisms of geogenic U in aquifers worldwide after suitable modifications to the relevant aquifer parameters.

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Section: Environmentalmentioning

confidence: 99%

Investigation of Potential Drivers of Elevated Uranium Prevalence in Indian Groundwaters with a Unified Speciation Model

Sujathan

Singh

2023

Environ. Sci. Technol.

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“…33,34 However, a recent study reported a bioassociation between U and archaea species in rock salts in Germany. 35 Moreover, archaea species have already been identied near U polluted sites. 36 Among prokaryotes, archaea species are considered non-negligible in various environments, especially in soils and aquatic freshwater ecosystems, where they are estimated to represent 2% (ref.…”

Section: àmentioning

confidence: 99%

Influence of microorganisms on uranium release from mining-impacted lake sediments under various oxygenation conditions

Seder-Colomina

Mangeret

Bauda

et al. 2022

Environ. Sci.: Processes Impacts

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“…In addition, the interactions of Cd and Zn with the Act12, e.g., biosorption and bioaccumulation, might also take place, resulting in a decrease in the soil Cd and Zn availabilities. For example, free heavy metal ions could be adsorbed by functional groups, e.g., -COOH, -NH 2 and -OH, on soil microorganisms cell membrane or bioaccumulated with intracellular polyphosphate granules (Banala et al, 2021). According to a previous study, the element transport corridor of microbes is often upregulated against nutrition de ciency, and an adverse consequence is the co-transport of heavy metal cations that may be toxic to the organism (Bruins et al, 2000).…”

Section: Extraction Of CD and Zn Frommentioning

confidence: 99%

“…As ubiquitous colonizers of plants, endophytic and rhizosphere bacteria regulate plant growth through diverse mechanisms and play a decisive role in plant health and productivity (Wemheuer et al, 2017), hence facilitating the application of hyperaccumulators in phytoextraction practices. Soil microorganisms generate metabolites e.g., organic acids, siderophores and plant growth hormones (1aminocyclopropane-1-carboxylate (ACC) deaminase and indole acetic acid), which interact with heavy metals through chelation, redox reaction or biosorption, and in uence the root development as well (Banala et al, 2021;Guarino & Sciarrillo, 2017). Indole acetic acid promotes plant growth by stimulating the elongation and division of plant cells, and microbial siderophores improve iron uptake by plants by chelating and solubilizing ferric iron in soil (Wood et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A preliminary study to explain the outstanding performance of Streptomyces pactum (Act12) in enhancing phytoextraction of Cd and Zn contaminated soils

Wang

Ren

Wang

et al. 2022

Preprint

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Streptomyces pactum (Act12) can both promote plant growth and strengthen heavy metal mobilization. Nevertheless, the mechanisms of how Act12 works during the phytoextraction process are still unknown. The present work investigated whether the metabolites produced by Act12 could influence the seed germination and the growth of potherb mustard, and explored its mobilizing effect on soil cadmium (Cd) and zinc (Zn). The results showed that the germination potential and rate of potherb mustard seed treated with Act12 fermentation broth were 1.0 and 0.32 folds higher than those of control, probably due to the interruption of seed dormant stage. We also found that Act12 inoculation not only promoted the dry biomass (6.82%) of potherb mustard, but also increased the leaf chlorophyll (11.8%) and soluble protein (0.35%) production. The boosted seed germination rate under Act12 treatment (up to 63.3%) indicated that Act12 enhanced the resistance of potherb mustard seeds to Cd and Zn and alleviated their physiological toxicity. The generated metabolites during the Act12 fermentation posed positive impact on the availability of soil Cd and Zn. These findings bring new insight into the Act12 assisted phytoextraction of Cd and Zn from contaminated soils.

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Microbial interactions with uranium: Towards an effective bioremediation approach

Cited by 61 publications

References 172 publications

Investigation of Potential Drivers of Elevated Uranium Prevalence in Indian Groundwaters with a Unified Speciation Model

Investigation of Potential Drivers of Elevated Uranium Prevalence in Indian Groundwaters with a Unified Speciation Model

Influence of microorganisms on uranium release from mining-impacted lake sediments under various oxygenation conditions

A preliminary study to explain the outstanding performance of Streptomyces pactum (Act12) in enhancing phytoextraction of Cd and Zn contaminated soils

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