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A Study on Conditions for Microbial Transport through Compacted Buffer Material

Published online by Cambridge University Press:  21 March 2011

Fukunaga,
M. Honya,
E. Yokoyama,
K. Arai,
T. Mine,
M. Mihara and
T. Senju
Fukunaga
Affiliation:
IHI (Ishikawajima-Harima Heavy Industries Co., Ltd.), Shin-nakahara-cho 1, Isogo-ku, Yokohama 235-8501, Japan
M. Honya
Affiliation:
IHI (Ishikawajima-Harima Heavy Industries Co., Ltd.), Shin-nakahara-cho 1, Isogo-ku, Yokohama 235-8501, Japan
E. Yokoyama
Affiliation:
IHI (Ishikawajima-Harima Heavy Industries Co., Ltd.), Shin-nakahara-cho 1, Isogo-ku, Yokohama 235-8501, Japan
K. Arai
Affiliation:
IHI (Ishikawajima-Harima Heavy Industries Co., Ltd.), Shin-nakahara-cho 1, Isogo-ku, Yokohama 235-8501, Japan
T. Mine
Affiliation:
JNC (Japan Nuclear Cycle Development Institute), Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194, Japan
M. Mihara
Affiliation:
JNC (Japan Nuclear Cycle Development Institute), Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194, Japan
T. Senju
Affiliation:
IIC (Ishikawajima Inspection and Instrumentation Co., Ltd.), Shin-nakahara-cho 1, Isogo-ku, Yokohama 235-8501, Japan
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Abstract

In order to assess microbial transport through compacted buffer material consisting of bentonite and silica sand with a density of 1.2, 1.6 or 1.8 g/cm3, sterilized test pieces with the diameter of 50 mm and the depth of 25 mm were fed with bacteria, Escherichia coli. The bacteria freely diffused when the proportion of Na-bentonite was 20 wt% or that of Ca-bentonite was 50 wt%. Bacterial movement was less than 5 mm in three weeks when the proportion of Na-bentonite was 70-100 wt% or that of Ca-bentonite was 100 wt%. A high proportion of bentonite is essential to slow down microbial entrance to the surface of a nuclear-waste container.

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References

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