摘要
铀尾渣中污染物的稳定化是铀矿冶行业亟待解决的关键问题。以中国北方某酸浸铀矿铀尾渣为研究对象,利用XRD、FTIR、16s rRNA等技术,开展了生物和非生物作用下淋滤过程的动态监测。结果表明:实验初期(0~14 d)实验柱出水U质量浓度明显高于对照柱,可能是微生物群落的竞争繁殖加速了铀尾渣中次生矿物分解和铀的淋滤;此后,实验柱出水中U质量浓度逐渐降低,在28 d时微生物修复效果可达到84.90%,42 d后出水铀质量浓度降低至(0.15±0.03)mg/L,修复效率最高达到92.29%以上,并且效果可实现至少30 d以上的长期稳定。本研究通过投加生物炭负载的功能微生物能够显著缩短微生物修复铀尾渣周期,填补尾渣间隙过水通道,提升铀尾渣物相结构的稳定性,降低污染物的迁移性,具有用于铀尾渣原位修复的潜在价值。
The stabilization of uranium tailings is a key problem to be solved in uranium mining and metallurgy industry.Based on the X-ray diffraction(XRD),Fourier transform infrared spectrometer(FTIR),16s rRNA and other technologies,the dynamic monitoring of leaching process under biological and abiotic action was carried out for uranium tailings from an acid leached uranium mine in northern China.The results showed that the uranium concentration in the effluent of the experimental column was significantly higher than that of the control column at the beginning of the experiment(0~14 d).It may be that the proliferation of functional microorganisms accelerated the decomposition of secondary minerals in uranium tailings and the leaching of uranium;After that,the concentration of U in the effluent of the experimental column gradually decreased,and the microbial remediation effect reached 84.90%at 28 days,then,it raised up to 92.29%and uranium concentration was 0.15±0.03 mg/L at 42 d,and the effect remained stable for more than 30 days.In this study,adding functional microorganisms loaded with biochar can significantly shorten the microbial remediation cycle,effectively achieve the remediation of U in uranium tailings,fill the pore water passage,improve the stability of the phase structure of uranium tailings,reduce the migration of pollutants,and have potential value for in-situ remediation of uranium tailings.
作者
安毅夫
连国玺
高扬
孙娟
武旭阳
任丽江
An Yifu;Lian Guoxi;Gao Yang;Sun Juan;Wu Xuyang;Ren Lijiang(The Fourth Research and Design Engineering Institute of China National Nuclear Corporation,Shijiazhuang 050021,China;School of Environment,Beijing Normal University,Beijing 100875,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第S02期562-567,共6页
Environmental Engineering
基金
河北省重点研发计划(20374205D)
国防科工局核设施退役及放射性废物治理科研项目(科工二司[2018]1251号)
关键词
铀尾渣
微生物
生物炭
铀污染
原位修复
uranium tailings
microorganism
uranium pollution
in-situ remediation
biochar
作者简介
第一作者:安毅夫(1992-),男,工程师,主要研究方向为环境微生物。anif_2015@126.com;通信作者:连国玺(1980-),男,研究员级高工,主要研究方向为辐射防护和环境保护。13931136052@139.com
