| 共存重金属和含氧阴离子对U(VI)生物沉淀过程的影响 |
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| 引用本文： | 易正戟,曹新星,谢叶归.共存重金属和含氧阴离子对U(VI)生物沉淀过程的影响[J].衡阳师范学院学报,2008,29(6). |
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| 作者姓名： | 易正戟 曹新星 谢叶归 |
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| 作者单位： | 1. 衡阳师范学院,化学与材料科学系,湖南,衡阳,421008;中国科学院地球化学研究所,环境地球化学国家重点实验室,贵州,贵阳,550002
2. 衡阳师范学院,化学与材料科学系,湖南,衡阳,421008 |
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| 基金项目： | 国家自然科学基金
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| 摘 要： | 以硫酸盐还原菌生物还原法消除模拟地浸废水中的放射性铀污染,分别研究了主要共污染离子Zn2+、Cu2+、SO2/4-和NO3-对铀生物沉淀过程的影响.厌氧序批式实验结果表明,初始Cu浓度低于10 mg/L或Zn浓度低于20 mg/L时对铀生物沉淀过程影响不大,当初始Cu浓度超过15 mg/L或Zn浓度超过25 mg/L时,该过程会因重金属的生物毒性作用被完全抑制.初始SO2/4-浓度低于4000 mg/L时时铀生物沉淀过程影响很小,超过5000 mg/L时会产生明显的抑制作用,且抑制作用随着SO2/4-浓度的上升而加强.研究还表明,含有NO3-的氧化性环境不利于铀的生物沉淀过程,通过反硝化反应彻底去除环境中的NO3-成为消除环境中铀污染的前提.本实验结果可望为我国核污染水环境的修复提供生物技术思路.
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| 关 键 词： | 硫酸盐还原菌(SRB) 生物沉淀 地浸采铀废水 |
Effect of Coexistent Heavy Metals and Oxyanions on the Bioprecipitation of Hexavalent Uranium |
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| YI Zheng-ji,CAO Xin-xing,XIE Ye-gui.Effect of Coexistent Heavy Metals and Oxyanions on the Bioprecipitation of Hexavalent Uranium[J].journal of Hengyang Normal University,2008,29(6). |
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| Authors: | YI Zheng-ji CAO Xin-xing XIE Ye-gui |
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| Institution: | YI Zheng-ji1,2,CAO Xin-xing1,XIE Ye-gui(1.Department of Chemistry , Material Science,Hengyang Normal University,Hengyang Hunan 421008,China,2.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang Guizhou 550002,China) |
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| Abstract: | The technology of microbial U(VI) reduction by sulfate reducing bacteria(SRB) was employed to treat simulated wastewater from in situ leach(ISL) uranium mining.Anaerobic batch experiments were performed to evaluate the effects of environmental factors,including coexisting heavy metals(Zn,Cu) and oxyanions(sulfate,nitrate)on U(VI) bioreduction processes(UBP).Sulfate concentration lower than 4000 mg/L did not affect UBP,however,sulfate concentration over 5000 mg/L significantly slowed UBP.Biogenic H2S produce... |
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| Keywords: | Zn Cu SO2/4- NO3- |
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