U(Ⅵ)在处置场地质环境中迁移规律的模拟研究  

Simulation study on migration of U(Ⅵ)in geological environment of disposal site

作　　者：赖捷[1] 成建峰[2] 阳刚 冷阳春[1] 庹先国 Lai Jie Cheng Jianfeng Yang Gang Leng Yangchun Tuo Xianguo(College of National Defense Science and Technology, Southwest University of Science and Technology, Mianyang Sichuan 621010, China College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu Sichuan 610059, China College of Chemistry and Environmental Engineering , Sichuan University of Science ＆ Engineering , ZigongSichuan643000, China)

机构地区：[1]西南科技大学国防科技学院,四川绵阳621010 [2]成都理工大学核技术与自动化工程学院,四川成都610059 [3]四川理工学院化学与环境工程学院,四川自贡643000

出　　处：《化工环保》2017年第5期592-597,共6页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金重点项目(4163000426);四川省应用基础研究计划项目(2014JY0206)

摘　　要：以西南某极低放射性废物处置场土壤为研究对象,采用静态吸附和动态吸附实验获取处置场地质特征参数,结合PHREEQC软件和地下水数值模拟系统(GMS)预测U(Ⅵ)在处置场环境中的化学种态和迁移规律。结果表明:U(Ⅵ)在处置场土壤中的吸附平衡时间为20 d,吸附分配系数为358 m L/g;U(Ⅵ)在处置场地下水环境中主要以UO_2(CO_3)_2^(2-)和UO_2(CO_3)_3^(4-)形式存在;处置场关闭后安全运行30 a,处置场中心U(Ⅵ)质量浓度下降4.20%,外围50 m与下游河流边界处U(Ⅵ)质量浓度分别为初始给定值的3.40%和1.32%;在12 a时有0.10%的U(Ⅵ)到达河边。Using the soil from a very low level radioactive waste disposal site in southwestem of China as research object, the geologic parameters of the disposal site were obtained by static and dynamic adsorption experiments, and combined with PHREEQC software and groundwater modeling system （GMS）, the chemical species and migration of U（Ⅵ） in the disposal site soil were predicted. The research result showed that： The adsorption equilibrium time of U（Ⅵ） in the disposal site soil was 20 d with 358 mL/g of the adsorption partition coefficient; U（Ⅵ） in groundwater of the disposal site was mainly in the form of UO2 （CO3）22. and UO2 （CO3）34-; In 30 a of safe operation of the closed disposal site, the U （VI）mass concentration of soil in the disposal site centre will decrease by 4.20%, and that of soil at outer-ring 50 m and downstream boundary will be 3.40% and 1.32% of the initial value respectively; After 12 a of operation, only 0.10% of U（Ⅵ） will arrive at the riverside.

关 键 词：铀 核素迁移 地下水数值模拟系统(GMS) PHREEQC软件 

分 类 号：X591[环境科学与工程—环境工程]