铀矿冶2025，Vol.44Issue(3)：1-15,15.DOI:10.13426/j.cnki.yky.2025.04.06
微电场耦合微生物修复地浸采铀酸性废水机制研究及条件优化
Mechanism Study and Conditions Optimization of Microelectric Field Coupled Microbial Remediation of Acidic Wastewater from In-situ Leaching Uranium Mining
摘要
Abstract
Acidic wastewater generated by in-situ leaching uranium poses a serious threat to the groundwater environment.Aiming at the problems of long microbial remediation cycle,low survival rate and insufficient stability of electrokinetic remediation,a remediation method of microelectric field-coupled sulfate-reducing bacteria(SRB)was proposed.Through simulated wastewater remediation experiments,a three-chamber electrochemical device was constructed to explore the remediation mech-anism and optimize the key parameters by combining the electromigration effect with the reduction function of SRB.The results show that the coupled remediation system significantly enhanced the ura-nium(Ⅵ)removal rate(more than 98％),and effectively reduced the concentrations of Ca,Mg,Al,Fe and other metal ions(removal rate＞80％)and sulfate content(removal rate＞90％).Under the influence of an electric field,uranyl ions migrate to the cathode region,where they are predominantly reduced by S2-generated through the metabolic activity of sulfate-reducing bacteria(SRB)and subse-quently co-precipitated.A minor fraction is reduced to U(Ⅵ)via electrode reactions.Experiments show that the different potential gradients can lead to different pH in the cathode chamber,which af-fects the remediation effect,with H+leading to the escape of S2-under acidic conditions(pH＜4)and the formation of soluble uranium complexes easily under alkaline conditions(pH＞9);with a potential gradient of 0.2～0.4 V/cm,the balancing remediation efficiency,microbial activity and energy econo-my.This study provides a theoretical basis and technical support for the green and efficient remedia-tion of acidic wastewater from uranium extraction by in-situ leaching technology.关键词
微电场/硫酸盐还原菌(SRB)/地浸采铀/铀去除/电迁移/酸性废水Key words
microelectric field/sulfate-reducing bacteria(SRB)/in-situ leaching uranium/uranium re-moval/electromigration/acidic wastewater分类
资源环境引用本文复制引用
韩兆顺,刘振中,李春光,李咏梅,谭凯旋,张宇,刘龙成..微电场耦合微生物修复地浸采铀酸性废水机制研究及条件优化[J].铀矿冶,2025,44(3):1-15,15.基金项目
湖南省自然科学基金(2024JJ5332,酸法地浸采铀退役矿山地下水中的同位素分馏机制研究). （2024JJ5332,酸法地浸采铀退役矿山地下水中的同位素分馏机制研究）
