Microbial effects on colloidal agglomeration
L. Hersman
- 01 Nov 1995
TL;DR: In this paper, a study was performed to determine if a soil microorganism, isolated from the surface samples collected at Yucca Mountain, NV, could affect the colloidal properties of day particles.
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Abstract: Colloidal particles are known to enhance the transport of radioactive metals through soil and rock systems. This study was performed to determine if a soil microorganism, isolated from the surface samples collected at Yucca Mountain, NV, could affect the colloidal properties of day particles. The agglomeration of a Wyoming bentonite clay in a sterile uninoculated microbial growth medium was compared to the agglomeration in the medium inoculated with a Pseudomonas sp. In a second experiment, microorganisms were cultured in the succinate medium for 50 h and removed by centrifugation. The agglomeration of the clay in this spent was compared to sterile uninoculated medium. In both experiments, the agglomeration of the clay was greater than that of the sterile, uninoculated control. Based on these results, which indicate that this microorganism enhanced the agglomeration of the bentonite clay, it is possible to say that in the presence of microorganisms colloidal movement through a rock matrix could be reduced because of an overall increase in the size of colloidal particle agglomerates. 32 refs.
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Citations
Evaluation of Potential Impacts of Microbial Activity on Drift Chemistry
Y. Wang
- 18 Nov 2004
TL;DR: In this article, the potential impacts of microbial activity on drift chemistry were evaluated using a near field environment and transport in-drift geochemistry analyses, and the potential for microbial activity in the waste emplacement drift under the constraints of anticipated physical and chemical conditions.
Radionuclide Uptake and Transport on Microbes in Potential Repository Drifts at Yucca Mountain, Nevada
TL;DR: In this paper, the average cumulative microbial biomass generated in the EBS at any given time was derived using MING V 1.0 software code, and a distribution for uranium uptake onto microbes (162.88 ± 133.05 mg U/gm dry cell) was applied to the microbial source term.
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References
Influence of clay minerals on microorganisms: iii. effect of particle size, cation exchange capacity, and surface area on bacteria
TL;DR: The stimulation of bacterial respiration by clay minerals was related to certain physicochemical characteristics of clays and the importance of surface area could not be unequivocally established, as some of the methods used to determine this characteristic on certain clay species were questionable.
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Selection of Attachment Mutants during the Continuous Culture of Pseudomonas fluorescens and Relationship between Attachment Ability and Surface Composition
TL;DR: The results demonstrate the role of cell surface characteristics in the adaptability of the organism to micro-environments such as a solid/liquid or air/liquid interface or the aqueous phase.
Studies by Microelectrophoretic and Microscopic Techniques of the Sorption of Illite and Montmorillonite to Rhizobia
TL;DR: Electrophoretic measurements indicated that with increasing concentrations of illite or montmorillonite the surfaces of bacteria became progressively enveloped by a layer of adsorbed clay.
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