PDF
Full
Outline
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 mechanism 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 uranium (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 subsequently co-precipitated. A minor fraction is reduced to U(IV) via electrode reactions. Experiments show that the different potential gradients can lead to different pH in the cathode chamber, which affects 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 economy. This study provides a theoretical basis and technical support for the green and efficient remediation of acidic wastewater from uranium extraction by in-situ leaching technology.
PDF
484
196
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
