Laboratory Examination of Microbial Perturbations in a Granitic Environment
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Laboratory Examination of Microbial Perturbations in a Granitic Environment J. M. West1, K. Hama2, K. Bateman1, P. Coombs1, V. Hards1, A. E. Milodowski1, P. Wetton1 and H. Yoshida2 1 British Geological Survey, Keyworth, Nottingham, Ng12 5gg, UK 2 Japan Nuclear Cycle Development Institute, Tono Geoscience Centre, 959-31, Jorinji Izumi, Toki, Gifu 509-51 Japan. ABSTRACT Microbial activity can have a significant impact on geochemical processes as it can influence mineral dissolution and precipitation, pH, alkalinity and redox. Experiments were conducted to study the rock-water and microbial interactions, specifically to examine the influence of microbes on the groundwater environment in fractured crystalline rock. These used combinations of crushed Äspö Diorite, Äspö groundwater with iron and sulphate reducing bacteria in columns and continuously stirred tank reactors under both anaerobic and aerobic conditions. Results showed loss (dissolution and/or mobilization) of fine grained crushed material (
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