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Identification of novel bacteria capable of accumulating 137 Cs under K + from anaerobic digested sludge for decontamination of 137 Cs-contaminated biomass
Journal of Material Cycles and Waste Management ( IF 2.7 ) Pub Date : 2020-03-02 , DOI: 10.1007/s10163-020-01004-7
Hayato Tokumoto , Kenta Nomoto , Kensuke Kurahashi

Abstract

Environmental purification using microorganisms has drawn attention for the decontamination of 137Cs released during a nuclear accident; however, Cs absorption by microorganisms is inhibited by the coexistence of potassium. In this study, we aimed to identify Cs-absorbing bacteria resistant to the inhibition of Cs absorption in the coexistence of potassium for the purpose of decontaminating 137Cs-contaminated biomass. When anaerobic sludge was cultured with the addition of CsCl, Cs accumulated in the microorganisms. This may be because Cs administration promoted the growth of specific Cs-absorbing bacteria. Metagenomics analysis of flora showed that the Tepidibacter genus dominated in the presence of Cs. In addition, Tepidibacter mesophilus accumulated 61.8 kBq/g dry weight of 137Cs in the presence of 4 mM K+, and presented high 137Cs-absorption ability, even in the presence of K+. Moreover, 74% of 137Cs absorption by anaerobic sludge was estimated to be due to bacteria of the Tepidibacter genus. It is assumed that 137Cs in the surface soil layer can be absorbed by surrounding microorganisms along with microbial decomposition of biomass containing a large amount of K+. Therefore, anaerobic sludge containing Tepidibacter genus may be used in the decontamination process of Cs released into environment as a useful Cs-accumulating flora.



中文翻译:

从厌氧消化污泥中鉴定能够在K +下累积137 Cs的新型细菌,以净化137 Cs污染的生物质

摘要

使用微生物进行环境净化已引起对核事故中释放的137 Cs的净化的关注。然而,钾的共存抑制了微生物对Cs的吸收。在这项研究中,我们旨在鉴定对钾共存的Cs吸收具有抑制作用的Cs吸收细菌,以净化137 Cs污染的生物质。在添加CsCl的情况下培养厌氧污泥时,Cs会在微生物中累积。这可能是因为Cs给药促进了特定的Cs吸收细菌的生长。菌群的元基因组学分析表明,在Cs的存在下,双歧杆菌属占优势。此外,嗜热嗜热双歧杆菌在4 mM K +存在下累积的137 Cs的干重为61.8 kBq / g ,即使在存在K +的情况下也表现出较高的137 Cs吸收能力。此外,估计厌氧污泥吸收的137 Cs中有74%是由于Tepidibacter属的细菌引起的。据推测,表层土壤层中的137 Cs可以被周围的微生物吸收,同时微生物分解含有大量K +的生物质。因此,含有Tepidibacter属的厌氧污泥可用于释放到环境中的Cs作为有用的Cs累积菌群的去污过程。

更新日期:2020-03-02
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