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有色金属(冶炼部分):2021,(4):62-70
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浸铀菌株选育及生理生化特征研究
(东华理工大学水资源与环境工程学院 东华理工大学核资源与环境国家重点实验室)
Study on the Breeding of Uranium Leaching Strains and Their Physiological and Biochemical Characteristics
Liu Jia-chen1, Liu Jin-hui2, Xu Ling-ling, Zhou Yi-peng, Zhang Yi-nuo
(1.School of Water Resources Environmental Engineering State Key Laboratory of Nuclear Resources and Environment,East China University of Technology;2.School of Water Resources Environmental Engineering State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang)
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投稿时间:2020-11-10    修订日期:2020-11-18
中文摘要: 为充分利用有限的菌液生产量进行地浸采铀生产,需开展地下原位植菌生物地浸技术研究,其关键技术之一是地浸中浸铀菌株的铁氧化活性是否能满足地下浸铀的要求。对采集于新疆某铀矿床岩心与地下水样品分离纯化得到的具有铁氧化活性的Acidithiobacillus ferriooxidans菌株(512SCK-Af-17),在20 ℃的低温环境和地浸尾液中铁氧化活性及其生理生化特征进行了系统研究。结果表明,经过连续培养和逐级驯化,菌株的铁氧化活性明显增强,可在20 ℃低温环境30 h将体系内5 g/L Fe2+完全氧化;该菌种在Fe2+浓度为3 g/L,初始pH为1.8,温度30 ℃的尾液培养环境中最短生长周期为16 h,且菌株在接种量20%,起始pH=1.8,Fe2+浓度5~10 g/L的培养环境中Fe2+氧化速率最快。研究成果对砂岩型铀矿原位植菌生物地浸技术的应用提供了科学依据。
Abstract:In order to make full use of limited production of bacterial liquid to extract uranium in situ, it is necessary to study biological leaching technology of underground in situ bacteria. One of the key technologies is whether iron-oxidation activity of uranium-leaching strains in in-situ leaching can meet requirements of underground uranium leaching. Acidithiobacillus ferriooxidans(512SCK-AF-17), a Acidithiobacillus ferriooxidans with ferric oxidation activity, was isolated and purified from a uranium deposit in Xinjiang, and its physiological and biochemical characteristics were systematically studied at low temperature environment of 20 ℃ and in-situ leaching tail solution. The results show that after continuous culture and gradual acclimation, ferric oxidation activity of strain is significantly enhanced, and 5 g/L Fe2+ can be completely oxidized in the system at low temperature of 20 ℃ for 30 hours. The shortest growth cycle of these strains is 16 h cultured in tail liquid with Fe2+ concentration of 3 g/L, initial pH value of 1.8, and temperature of 30 ℃. Fe2+ oxidation rate is the highest in culture environment with 20% inoculations, initial pH value of 1.8, and Fe2+ concentration of 5~10 g/L. This research results provide a scientific basis for application of biological in-situ leaching technology of sandstone-type uranium deposits.
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基金项目:国家自然科学基金(核技术创新联合基金)资助项目(U1967209);江西省重点研发计划项目(20161BBH80051)
引用文本:
刘佳晨.,刘金辉.,徐玲玲.,周义朋.,张一诺..浸铀菌株选育及生理生化特征研究[J].有色金属(冶炼部分),2021(4):62-70.
Liu Jia-chen,Liu Jin-hui,Xu Ling-ling,Zhou Yi-peng,Zhang Yi-nuo.Study on the Breeding of Uranium Leaching Strains and Their Physiological and Biochemical Characteristics[J].Nonferrous Metals (Extractive Metallurgy),2021(4):62-70.

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