1. The Two Step Remediation Approach for Groundwater in the Decommissioned Mining Field of Acid In-situ Leach Uranium Mining.
- Author
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WANG Xianlei, LI Feng, ZHANG Hui, MA Jianhong, HU Nan, DAI Zhongran, DING Dexin, WANG Xinting, and JIANG Tang
- Abstract
Groundwater in the decommissioned mining field of acid-based in-situ leaching of uranium has such characteristics as strong acidity and excessive uranium and SO42- concentrations, and its remediation is an urgent problem to be studied and solved. In this paper, the groundwater in the decommissioned mining field of an acid in situ leach uranium mine in northwestern China was taken as the research object, and the CaO neutralization method was firstly applied for the removal of uranium. After that, an anaerobic Desul fovibrio desul furicans microbial membrane reactor was constructed, and the effects of carbon source and influent flow rate on the removal of SO42- in the neutralized groundwater were explored. The results showed that after neutralization with 0. 167 g CaO, the pH value of each liter of groundwater was raised from original 3.0 to 7.0, the uranium concentration was decreased from original 0.4 mg/L to 0.04 mg/L, which met the standard for discharge, and the SO42- concentration was decreased from original 1 349.2 mg/L to 840.3 mg/L. The neutralized groundwater was then treated by the constructed Desul fovibrio desul furicans microbial membrane reactor, and when the carbon source was glucose and the influent flow rate was 1.0 mL/min, the SO42- concentration was decreased from 840.3 mg/L to 256 mg/L, which also met the standard for discharge. This study shows that the two-step remediation approach, in which uranium was firstly removed using CaO neutralization method and the SO42- was then removed by anaerobic Desul fovibrio desul furicans microbial membrane reactor, has a potential application prospect in the treatment of groundwater in the decommissioning mining field of acid in-situ leach uranium mining. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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