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首页> 外文期刊>Annals of nuclear energy >Biogeochemical changes at early stage after the closure of radioactive waste geological repository in South Korea
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Biogeochemical changes at early stage after the closure of radioactive waste geological repository in South Korea

机译：韩国放射性废物地质处置库关闭后早期的生物地球化学变化

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摘要

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 geo-chemical 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 gases were detected during the study, activated anaerobic microbes will play more important role in gas generation over the long term.
机译：在地下环境中永久处置中低放射性废物一直是包括韩国在内的许多国家的首选方法。地质处置库关闭后的一个安全问题是，由于微生物活动而导致的有机材料的生物降解会产生气体，这些气体导致处置库中废物容器的压力过大，并随着放射性核素的释放而分解。作为正在进行的使用有机废物和地下水模拟地质放射性废物储存条件的大规模原位实验的一部分，我们调查了早期（〜63天）的地球化学变化和微生物活动，旨在代表初始阶段。存储库关闭后的期限。废水中需氧菌和兼性厌氧菌数量的增加表明，在反应的非常早期（＜35天），氧含量可能是控制生物地球化学条件的最重要参数。因此，溶解氧和氧化还原电位的值降低。 35天后厌氧菌的激活是由浓度增加至〜50 mg L〜（-1）乙醇来支持的。这些结果表明，在库关闭后的最初两个月内，生物地球化学条件迅速改变为更多的还原性和厌氧条件。尽管在研究期间未检测到气体，但长期而言，活化的厌氧微生物将在气体产生中发挥更重要的作用。

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  • 来源
    《Annals of nuclear energy》 |2014年第9期|6-10|共5页
  • 作者

    Sungwook Choung; Wooyong Um; Seho Choi; Arokiasamy J. Francis; Sungpyo Kim; Jin beak Park; Suk-Hoon Kim;

  • 作者单位

    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), 77 Chongam-ro, Nam-gu, Pohang 790-784, Republic of Korea;

    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), 77 Chongam-ro, Nam-gu, Pohang 790-784, Republic of Korea,Energy and Environment Directorate, Pacific Northwest National Laboratory (PNNL), 902 Battelle Blvd., P7-54, Richland, WA 99354, USA;

    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), 77 Chongam-ro, Nam-gu, Pohang 790-784, Republic of Korea;

    Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), 77 Chongam-ro, Nam-gu, Pohang 790-784, Republic of Korea,Environmental Sciences Department, Brookhaven National Laboratory, Upton, NY 11973, USA;

    Department of Environmental Engineering, Korea University, 2511 Sejong-ro, Sejong 339-700, Republic of Korea;

    Korea Radioactive Waste Agency (KORAD), 111, Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon 305-353, Republic of Korea;

    FNC Technology Co., 135-306, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 110-799, Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Geological repository; Radionuclide; Gas generation; Microbial activities; Organic waste;

    机译：地质库;放射性核素;气体产生;微生物活动;有机废物;

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