U(VI) removal efficiency by natural pyrite under the oxygen-rich conditions with/without bicarbonate present

2018 International Conference of Green Buildings and Environmental Management

土木建筑工程;生态环境科学

Xie, Yanpei^1 ; Fang, Qi^1,2 ; Luo, Yingfeng^1 ; Tan, Zhenghang^1 ; Wang, Zhihong^1 ; Ding, Liu^1

School of Environment and Safety Engineering, University of South China, 421001, China^1

Hunan Provincial Engineering and Technology Center of Decommissing Uranium Tailings Treatment, 421001, China^2

关键词: Bicarbonate ions;    Dynamic leaching;    Effective materials;    Oxygen-rich conditions;    Pyrite oxidation;    Reducing environment;    Removal efficiencies;    Removal rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/186/4/012046/pdf
DOI  :  10.1088/1755-1315/186/4/012046

来源: IOP

【 摘 要 】

Natural pyrite, as an ubiquitous mineral in the reducing environments, shows great potential on the treatment of wastewater polluted by heavy metals. In the present work, a dynamic leaching experiment was carried out to investigate the removal efficiency of U(VI) by natural pyrite under the oxygen rich conditions with/without bicarbonate ions. Experimental results shows that pyrite oxidation can significantly remove U(VI) from the solution under the oxygen rich conditions with/without bicarbonate ions. With the absence of bicarbonate ions, U(VI) concentration decreases from 50 mg/L to 20 mg/L with the removal rate up to 60%; with the presence of bicarbonate ions, U(VI) concentration decreases from 50 mg/L to 30 m/L with the removal rate up to 40%, indicating that natural pyrite can be an effective material to treat high-uranium groundwater under the oxygen-rich conditions with bicarbonate present or not.