Roles of extracellular polymeric substances in uranium immobilization by anaerobic sludge

AMB Express

Xian-Jin Lyu¹  Jian Chu¹  Yong-Peng Wang¹  Hai-Ling Zhang¹  He-Xiang Huang¹  Shi-Cheng Li¹  Wei-Dong Liu¹  Dong Zhao¹  Meng-Xi Cheng¹  Huan-Huan Ding¹  Feng-Yu Huang² 

[1] Institute of Materials, China Academy of Engineering Physics;School of Environment and Resources, Southwest University of Science & Technology;

关键词: Uranium;    Extracellular polymeric substances (EPS);    Anaerobic sludge;    Analysis of variance;    Grey relational analysis;   

DOI  :  10.1186/s13568-019-0922-2

来源: DOAJ

【 摘 要 】

Abstract The specific roles of extracellular polymeric substances (EPS) and how factors influenced EPS’s roles during U(VI) immobilization are still unclear. In this study, high content of U with the main form of nanoparticles was detected in EPS, accounting for 10–42% of total U(VI) removal. EPS might be utilized as energy source or even as electron donors when external carbon source was unavailable. The influencing degree of each experimental parameter to uranium (U) removal process was elucidated. The influential priority to U(IV)/U(VI) ratios in sludge was as follows: acetate, U(VI), and nitrate. The influential priority to total EPS contents was as follows: U(VI), nitrate and acetate. The complex interaction mechanism between U(VI) and EPS in the U immobilization process was proposed, which might involve three ways including biosorption, bioreduction and bioprecipitation. These results indicate important and various roles of EPS in U(VI) immobilization.

【 授权许可】

Unknown