Anaerobic biodegradation of citric acid in the presence of Ni and U at alkaline pH; impact on metal fate and speciation

Byrd, Natalie; Lloyd, Jonathan R.; Townsend, Luke T.; Small, Joe S.; Taylor, Frank; Bagshaw, Heath; Boothman, Christopher; Strashnov, I.; Morris, Katherine

doi:10.1039/d3va00061c

Environ. Sci.: Adv.

2023

DOI: 10.1039/d3va00061c

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Anaerobic biodegradation of citric acid in the presence of Ni and U at alkaline pH; impact on metal fate and speciation

Natalie Byrd

Jonathan R. Lloyd

Luke T. Townsend

et al.

Abstract: Biodegradation of citrate occurred under LLW repository relevant conditions with Ni and U present. Citrate biodegradation led to the formation of insoluble Ni sulfides or nanocrystalline U(iv)–phosphate and may promote Ni/U retention in LLW repositories.

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Radioactive waste microbiology: predicting microbial survival and activity in changing extreme environments

Gregory,

Mackie,

Barnett

2024

FEMS Microbiology Reviews

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The potential for microbial activity to occur within the engineered barrier system (EBS) of a geological disposal facility (GDF) for radioactive waste is acknowledged by waste management organisations as it has the potential to affect many aspects of the safety functions of a GDF. Microorganisms within an EBS will be exposed to changing temperature, pH, radiation, salinity, saturation and availability of nutrient and energy sources, which can limit microbial survival and activity. Some of the limiting conditions are incorporated into GDF designs for safety reasons, including: the high pH of cementitious repositories, the limited pore space of bentonite-based repositories or the high salinity of GDFs in evaporitic geologies. Other environmental conditions such as elevated radiation, temperature and desiccation arise as a result of the presence of high heat generating waste (HHGW). Here, we present a comprehensive review of how environmental conditions in the EBS may limit microbial activity, covering HHGW and lower heat generating waste (LHGW) in a range of geological environments. We present data from the literature on the currently recognised limits to life for each of the environmental conditions described above, and nutrient availability to establish the potential for life in these environments. Using examples where each variable has been modelled for a particular GDF, we outline the times and locations when that variable can be expected to limit microbial activity. Finally, we show how this information for multiple variables can be used to improve our understanding of the potential for microbial activity to occur within the EBS of a GDF, and more broadly to understand microbial life in changing environments exposed to multiple extreme conditions.

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Radioactive waste microbiology: predicting microbial survival and activity in changing extreme environments

Gregory,

Mackie,

Barnett

2024

FEMS Microbiology Reviews

View full text Add to dashboard Cite

show abstract

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Anaerobic biodegradation of citric acid in the presence of Ni and U at alkaline pH; impact on metal fate and speciation

Abstract: Biodegradation of citrate occurred under LLW repository relevant conditions with Ni and U present. Citrate biodegradation led to the formation of insoluble Ni sulfides or nanocrystalline U(iv)–phosphate and may promote Ni/U retention in LLW repositories.

Cited by 1 publication

References 114 publications

Radioactive waste microbiology: predicting microbial survival and activity in changing extreme environments

Radioactive waste microbiology: predicting microbial survival and activity in changing extreme environments

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