一株硫酸盐还原菌脱硫固铀性能及其固铀稳定性研究  

Characteristics of Desulfurization and Uranium Immobilization by a Sulfate-reducing Bacteria Strain and Stability of the Immobilized Product

作　　者：陈新 刘亚洁[1,2] 陈宏亮 赵贝 刘淼 孙占学[1,2] 陈箭光 徐屹群 CHEN Xin;LIU Yajie;CHEN Hongliang;ZHAO Bei;LIU Miao;SUN Zhanxue;CHEN Jianguang;XU Yiqun(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Changping District River and Lake Ecological Environment Service Center,Beijing 102200;Xinjiang Tianshan Uranium Co.,Ltd.,CNNC,Yining 835000,Xinjiang,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]东华理工大学水资源与环境工程学院,南昌330013 [3]中国地质大学(北京)水资源与环境学院,北京100083 [4]北京市昌平区河湖生态环境服务中心,北京102200 [5]新疆中核天山轴业有限公司,新疆伊宁835000

出　　处：《有色金属（冶炼部分）》2024年第6期154-162,共9页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(41772266);中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金资助项目(2022NRE-LH-20)。

摘　　要：从某铀矿山周边土壤中富集分离出一株硫酸盐还原菌A1_(S)XC21Q,研究了该菌株在不同pH、温度、SO_(4)^(2-)浓度下的脱硫和固铀性能,及其固铀产物的稳定性。结果表明:pH升高有利于该菌对SO_(4)^(2-)和铀的去除,初始pH为5.5~7.0条件下,SO_(4)^(2-)和铀的去除率均可达到95%以上;初始SO_(4)^(2-)浓度增加会降低菌株对SO_(4)^(2-)和铀的去除率,但在SO_(4)^(2-)浓度为2000 mg/L条件下,SO_(4)^(2-)和铀的去除率仍可达到75.42%和50.57%;温度升高可显著加速SO_(4)^(2-)和铀的去除,25~35℃条件下,SO_(4)^(2-)和铀的去除率均达到95%左右;A1 S XC21Q菌株可将富集于其表面的铀转移到细胞内部并形成多个“核状”磷酸铀酰络合物,形成的固铀产物稳定。从A1 S XC21Q菌脱硫固铀效果及其固铀产物稳定性来看,该菌有望用于后续酸法地浸铀矿山退役采区地下水生物修复技术试验研究中。A sulfate-reducing bacterial strain,A1_(S)XC21Q,was enriched and isolated from the soil in a uranium mine,and the desulfurization and uranium-fixing properties of the strain and the stability of its uranium-fixing products were investigated under different pH value,temperature,and SO_(4)^(2-)condition.The results show that elevated pH value favores the removal of SO_(4)^(2-)and uranium by the bacterial strain,and the removal of both SO_(4)^(2-)and uranium can reach higher than 95%under the initial pH value of 5.5-7.0.Increasing initial SO_(4)^(2-)concentration decreases the removal rate of SO_(4)^(2-)and uranium,however,the removal rate of SO_(4)^(2-)and uranium can still reach 75.42%and 50.57%when the initial SO_(4)^(2-)concentration is 2000 mg/L.The removal of SO_(4)^(2-)and uranium can be accelerated significantly by increasing temperature,and the removal rate of both SO_(4)^(2-)and uranium reaches about 95%at 25-35℃.A1 S XC21Q can transfer uranium enriched on its surface to the interior of the cell and form multiple“nucleated”uranyl phosphate complexes,resulting in a stabilized uranium-fixing product.From the perspective of the desulfurization and uranium fixation effect of A1_(S)XC21Q and the stability of its solid uranium fixation products,it is expected that A1 S XC21Q can be used in the subsequent experimental research of groundwater bioremediation technology in the retired mining area of acid leaching uranium mines in the future.

关 键 词：硫酸盐还原菌 脱硫 固铀 固铀产物稳定性 含铀地下水 

分 类 号：X703[环境科学与工程—环境工程]