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- W2023684322 abstract "Permanent disposal of low- and intermediate-level radioactive wastes in the subterranean environment has been the preferred method of many countries, including Korea. A safety issue after the closure of a geological repository is that biodegradation of organic materials due to microbial activities generates gases that lead to overpressure of the waste containers in the repository and its disintegration with the release of radionuclides. As part of an ongoing large-scale in situ experiment using organic wastes and groundwater to simulate geological radioactive waste repository conditions, we investigated the geochemical alteration and microbial activities at an early stage (~63 days) intended to be representative of the initial period after repository closure. The increased numbers of both aerobes and facultative anaerobes in waste effluents indicate that oxygen content could be the most significant parameter to control biogeochemical conditions at very early periods of reaction (<35 days). Accordingly, the values of dissolved oxygen and redox potential were decreased. The activation of anaerobes after 35 days was supported by the increased concentration to ~50 mg L-1 of ethanol. These results suggest that the biogeochemical conditions were rapidly altered to more reducing and anaerobic conditions within the initial 2 months after repository closure. Although no gasesmore » were detected during the study, activated anaerobic microbes will play more important role in gas generation over the long term.« less" @default.
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- W2023684322 date "2014-09-01" @default.
- W2023684322 modified "2023-09-24" @default.
- W2023684322 title "Biogeochemical changes at early stage after the closure of radioactive waste geological repository in South Korea" @default.
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- W2023684322 doi "https://doi.org/10.1016/j.anucene.2014.03.021" @default.
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