Format

Send to

Choose Destination
J Appl Microbiol. 2000 Dec;89(6):1038-47.

Mixing and sulphate-reducing activity of bacteria in swelling, compacted bentonite clay under high-level radioactive waste repository conditions.

Author information

1
Department of Cell and Molecular Biology, Microbiology Section, Göteborg University, Göteborg and Clay Technology AB, Ideon Research Centre, Lund, Sweden. pedersen@gmm.gu.se

Abstract

AIM:

The fate of micro-organisms in the bentonite clay surrounding high-level radioactive waste (HLW)-containing copper canisters in a future Swedish underground (500 m) repository were investigated.

METHODS AND RESULTS:

Laboratory experiments were designed in which the mixing of various bacterial species with swelling bentonite was studied. A clear trend of fewer cultivable bacteria at depth was seen in the clay. This trend was consistent as the incubation time was increased from 8 h to 28 weeks. Sulphate-reducing bacteria were found to be active, reducing sulphate at the lowest density studied, 1.5 g cm-3, but sulphate reduction activity ceased at higher densities.

CONCLUSIONS:

The number of viable micro-organisms in an HLW repository bentonite clay buffer will decrease rapidly during swelling and very few viable cells will be present at full compaction.

SIGNIFICANCE AND IMPACT OF THE STUDY:

Sulphate-reducing bacteria will most probably not be able to induce corrosion of HLW-containing copper canisters.

[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center