化工学报 ›› 2023, Vol. 74 ›› Issue (6): 2655-2667.DOI: 10.11949/0438-1157.20230147

• 能源和环境工程 • 上一篇    下一篇

铁炭微电解与硫酸盐还原菌耦合修复铀尾矿库渗滤水的研究

胡南1,2(), 陶德敏1,2, 杨照岚1, 王学兵1, 张向旭1, 刘玉龙3, 丁德馨1,2()   

  1. 1.南华大学铀矿冶生物技术国防重点实验室,湖南 衡阳 421001
    2.南华大学极贫铀资源绿色开发技术湖南省重点实验室,湖南 衡阳 421001
    3.中广核铀业发展有限公司,北京 100029
  • 收稿日期:2023-02-22 修回日期:2023-05-19 出版日期:2023-06-05 发布日期:2023-07-27
  • 通讯作者: 丁德馨
  • 作者简介:胡南(1982—),男,博士,教授,hn12352000@163.com
  • 基金资助:
    国家自然科学基金项目(U1967210);湖南省杰出青年基金项目(2022JJ10041);湖南省科技人才托举项目(2020TJ-Q03)

Remediation of percolate water from uranium tailings reservoir by coupling iron-carbon micro-electrolysis and sulfate reducing bacteria

Nan HU1,2(), Demin TAO1,2, Zhaolan YANG1, Xuebing WANG1, Xiangxu ZHANG1, Yulong LIU3, Dexin DING1,2()   

  1. 1.Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
    2.Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, University of South China, Hengyang 421001, Hunan, China
    3.China General Nuclear Power Group (CGN) Uranium Resources Co. , Ltd. , Beijing 100029, China
  • Received:2023-02-22 Revised:2023-05-19 Online:2023-06-05 Published:2023-07-27
  • Contact: Dexin DING

摘要:

设计了铁炭微电解-硫酸盐还原菌(Fe/C-SRB)、铝炭微电解-硫酸盐还原菌(Al/C-SRB)、炭-硫酸盐还原菌(C-SRB)、铁炭微电解(Fe/C)、铝炭微电解(Al/C)和炭(C)6个反应器,并研究了它们修复铀尾矿库渗滤水中U、Mn、Zn、SO42-以及NO3-的效果。结果显示:经过2.5 h,Fe/C-SRB系统出水U浓度降至0.05 mg/L以下;1 d后,Mn浓度降至10 mg/L以下;1 d后,Zn浓度降至0.05 mg/L以下;10 d后,SO42-浓度降至50 mg/L以下;18 d后,NO3-浓度降至10 mg/L以下,均达到了相关国家排放标准,并运行稳定,处理效率显著高于其他反应器。60 d时,Fe/C-SRB系统填料中具有还原U(Ⅵ)功能的微生物DesulfotomaculumDesulfovibrioDesulfosporosinus群落丰度总和达到61.45%,与Al/C-SRB、C-SRB、Al/C、Fe/C和C系统相比,分别高了40.35%、60.06%、57.22%、59.73%和52.46%;渗滤水中33.20%的U(Ⅵ)被微生物和铁还原成U(Ⅳ)。本研究表明Fe/C-SRB是一种具有应用前景的修复铀尾矿库渗滤水的方法。

关键词: 铀, 硫酸盐还原菌, 微电解, 还原, 厌氧, 修复

Abstract:

Six reactors, including iron-carbon micro-electrolysis coupling with sulfate reducing bacteria (Fe/C-SRB), aluminum-carbon micro-electrolysis coupling with sulfate reducing bacteria (Al/C-SRB), carbon coupling with sulfate reducing bacteria (C-SRB), iron-carbon micro-electrolysis (Fe/C), aluminum-carbon micro-electrolysis (Al/C) and carbon (C), were designed to investigate their effects on the remediation of U, Mn, Zn, SO42- and NO3- in the percolate water from the uranium tailings reservoir. The results indicated that the concentration of U in the effluent of Fe/C-SRB reactor system decreased to 0.05 mg/L after 2.5 h. The concentration of Mn decreased to 10 mg/L and the concentration of Zn decreased to 0.05 mg/L after 1 d. The concentration of SO42- decreased to 50 mg/L after 10 d, and the concentration of NO3- decreased to 10 mg/L after 18 d, all of which satisfied with the relevant national emission standards, and operated stably. The treatment efficiency of Fe/C-SRB reactor was significantly higher than that of other reactors. The total abundance of microbial communities including Desulfotomaculum, Desulfovibrio, and Desulfosporosinus with the function of reducing U(Ⅵ) in the filler of the Fe/C-SRB reactor system reached 61.45%, which was 40.35%, 60.06%, 57.22%, 59.73% and 52.46% higher than that of Al/C-SRB, C-SRB, Al/C, Fe/C and C reactor systems at 60 d, respectively. The 33.20% of U(Ⅵ) in the leachate was reduced to U(Ⅳ) by microorganisms and iron. The study demonstrates that Fe/C-SRB is a promising method for remediating percolation water from uranium tailings reservoir.

Key words: uranium, sulfate reducing bacteria, micro-electrolysis, reduction, anaerobic, remediation

中图分类号: