Effects of the Sr/Ca ratio on the bioremediation of strontium based on microbially-induced carbonate precipitation

Su, Zhimeng; Deng, Zelan; Wang, Yazhi; Ji, Chen; Li, Fuchun; Yang, Guoguo; Huang, Lingjie

doi:10.1016/j.jece.2022.108990

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…Overall, amending Sellafield sediment microcosms with urea (and additional biostimulating compounds) correlated with increased and more rapid Sr and Ca removal, indicating that calcium carbonate precipitation may be occurring and responsible for enhancing Sr uptake. Microbially precipitated carbonates are well-known to simultaneously remove Ca 2+ and Sr 2+ . − Stimulating ureolytic bacteria with urea in pure culture studies has produced an increase in groundwater pH from circumneutral to ≥9 on the order of hours, under both oxic and anoxic conditions. , …”

Section: Resultsmentioning

confidence: 99%

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Enhanced Strontium Removal through Microbially Induced Carbonate Precipitation by Indigenous Ureolytic Bacteria

White-Pettigrew,

Shaw,

Hughes

et al. 2024

ACS Earth Space Chem.

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Microbial ureolysis offers the potential to remove metals including Sr2+ as carbonate minerals via the generation of alkalinity coupled to NH4 + and HCO3 – production. Here, we investigated the potential for bacteria, indigenous to sediments representative of the U.K. Sellafield nuclear site where 90Sr is present as a groundwater contaminant, to utilize urea in order to target Sr2+-associated (Ca)CO3 formation in sediment microcosm studies. Strontium removal was enhanced in most sediments in the presence of urea only, coinciding with a significant pH increase. Adding the biostimulation agents acetate/lactate, Fe(III), and yeast extract to further enhance microbial metabolism, including ureolysis, enhanced ureolysis and increased Sr and Ca removal. Environmental scanning electron microscopy analyses suggested that coprecipitation of Ca and Sr occurred, with evidence of Sr associated with calcium carbonate polymorphs. Sr K-edge X-ray absorption spectroscopy analysis was conducted on authentic Sellafield sediments stimulated with Fe(III) and quarry outcrop sediments amended with yeast extract. Spectra from the treated Sellafield and quarry sediments showed Sr2+ local coordination environments indicative of incorporation into calcite and vaterite crystal structures, respectively. 16S rRNA gene analysis identified ureolytic bacteria of the genus Sporosarcina in these incubations, suggesting they have a key role in enhancing strontium removal. The onset of ureolysis also appeared to enhance the microbial reduction of Fe(III), potentially via a tight coupling between Fe(III) and NH4 + as an electron donor for metal reduction. This suggests ureolysis may support the immobilization of 90Sr via coprecipitation with insoluble calcium carbonate and cofacilitate reductive precipitation of certain redox active radionuclides, e.g., uranium.

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Section: Resultsmentioning

confidence: 99%

“…Microbially precipitated carbonates are well-known to simultaneously remove Ca 2+ and Sr 2+ . 87 − 89 Stimulating ureolytic bacteria with urea in pure culture studies has produced an increase in groundwater pH from circumneutral to ≥9 on the order of hours, under both oxic and anoxic conditions. 90 , 91 …”

Section: Resultsmentioning

confidence: 99%

Enhanced Strontium Removal through Microbially Induced Carbonate Precipitation by Indigenous Ureolytic Bacteria

White-Pettigrew,

Shaw,

Hughes

et al. 2024

ACS Earth Space Chem.

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“… Remediation method Remediation condition Remediation efficiency Reference Phytoremediation ( Vetiveria zizanoides ) Target pollutants: 137 Cs and 90 Sr in solution; initial concentration activity of pollutants: 5 × 10 3 Bq/mL ( 137 Cs) and 5 × 10 3 Bq/mL ( 90 Sr); remediation time: 168 h 94% of 90 Sr and 61% of 137 Cs were removed in single pollutant solution, respectively; 91% of 90 Sr and 59% of 137 Cs were removed in binary pollutants solution, respectively [ 153 ] Phytoremediation ( Ludwigia stolonifera ) Target pollutant: 137 Cs and 60 Co in solution; initial concentration activity of pollutants: 305 Bq/mL ( 137 Cs) and 145 Bq/mL ( 60 Co); amounts of the biomass: 2 g; remediation time: 20 days 95% of 137 Cs and 95% of 60 Co were removed in a single pollutant solution, respectively; 65% of 137 Cs and 95% of 60 Co were removed in binary pollutants solution, respectively [ 154 ] Phytoremediation ( Vetiveria zizanioides L. Nash) Target pollutant: 239 Pu in hydroponic solution; initial concentration of pollutant: 100 Bq/mL; remediation time: 30 day 66.2% of 239 Pu was removed from the hydroponic solution [ 155 ] Microbially-induced carbonate precipitation ( Enterobacter sp.) Target pollutant: 90 Sr in solution; dosage of CaCl 2 : 0.01 mol/L; initial concentration of pollutant: 0.0001–0.01 mol/L; remediation time: 20 day 10%–34% of immobilization rate for 90 Sr [ 156 ] Fungal isolates ( Aspergillus hollandicus and Penicillium citrinum ) Target pollutants: 238 U, 226 Ra, 232 Th, and 40 K in rock; average concentration activity of pollutants in fungal: 5134.03 Bq/kg ( 238 U), 5708.64 Bq/kg ( 226 Ra), 189.51 Bq/kg ( 232 Th) and 1456.8 Bq/kg ( 40 K) The harmful effect was potentially reduced to 50% compared to the original ...…”

Section: Remediation Techniques For Nuclear Isotope Emissions or Leaksmentioning

confidence: 99%

Unraveling the nuclear isotope tapestry: Applications, challenges, and future horizons in a dynamic landscape

Yang,

Feng,

et al. 2024

Eco-Environment & Health

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“…Microbial mineralization occurs in various environments, including soil, freshwater, marine ecosystems, and oilfield wastewater. Environmental conditions play a crucial role in determining the specific type of calcium carbonate (CaCO 3 ) mineral formed through bacterial precipitation [23][24][25]. Since Synechocystis sp.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium and Ferric Ions on the Biomineralization of Calcium Carbonate Induced by Synechocystis sp. PCC 6803

Zhao,

Han,

Liang

et al. 2023

Minerals

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The discovery of cyanobacteria fossils in microbialite prompts the investigation of carbonate biomineralization using cyanobacteria. However, the impact of coexisting magnesium and iron in microbialite on carbonate biomineralization has been overlooked. Here, Synechocystis sp. PCC 6803 was used to induce calcium carbonate in the presence of coexisting magnesium and ferric ions. The findings demonstrate that cell concentration, pH, carbonic anhydrase activity, and carbonate and bicarbonate concentrations decreased with increasing concentrations of magnesium and calcium ions. Ferric ions yielded a contrasting effect. The levels of deoxyribonucleic acid, protein, polysaccharides, and humic substances in extracellular polymeric substances increased in the presence of separated or coexisting calcium, magnesium, and ferric ions. Magnesium ions inhibited calcium ion precipitation, whereas ferric ions exhibited the opposite effect. Protein secondary structures became more abundant and O-C=O and N-C=O contents increased with increasing ion concentrations by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses. Scanning electron microscopy revealed that ferric ions lead to rougher surfaces and incomplete rhombohedral structures of calcite, whereas magnesium ions promoted greater diversity in morphology. Magnesium ions enhanced the incorporation of ferric ions. This work aims to further understand the effect of magnesium and ferric ions on calcium carbonate biomineralization induced by cyanobacteria.

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Effects of the Sr/Ca ratio on the bioremediation of strontium based on microbially-induced carbonate precipitation

Cited by 6 publications

References 44 publications

Enhanced Strontium Removal through Microbially Induced Carbonate Precipitation by Indigenous Ureolytic Bacteria

Enhanced Strontium Removal through Microbially Induced Carbonate Precipitation by Indigenous Ureolytic Bacteria

Unraveling the nuclear isotope tapestry: Applications, challenges, and future horizons in a dynamic landscape

Effect of Magnesium and Ferric Ions on the Biomineralization of Calcium Carbonate Induced by Synechocystis sp. PCC 6803

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