Perchlorate bioreduction by anaerobic granular sludge immobilised with Fe-HA complex: Performance, extracellular polymeric substances and microbial community structure

被引：23
作者：
Liu, Weilong [1 ,3 ]
Lian, Jing [1 ]
Guo, Jianbo [2 ]
Guo, Yankai [1 ]
Yue, Lin [1 ]
Niu, Yanyan [1 ]
Duan, Lili [1 ]
机构：
[1] Hebei Univ Sci & Technol, Pollut Prevent Biotechnol Lab Hebei Prov, Sch Environm Sci & Engn, Yuhua East Rd 70, Shijiazhuang 050018, Hebei, Peoples R China
[2] Tianjin Chengjian Univ, Sch Environm & Municipal Engn, Tianjin Key Lab Aquat Sci & Technol, Jinjing Rd 26, Tianjin 300384, Peoples R China
[3] China Nucl Power Engn Co Ltd, Hebei Branch, Yuhua East Rd 56, Shijiazhuang 050019, Hebei, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2020年 / 398卷
基金：
中国国家自然科学基金;
关键词：
Iron-humic acid complex; Perchlorate; Bioreduction; Performance; Extracellular polymeric substances; Microbial community structure; CONCENTRATED PERCHLORATE; ELECTRON-ACCEPTORS; REDOX MEDIATORS; ORGANIC-MATTER; REDUCTION; KINETICS; BIOTRANSFORMATION; FLUORESCENCE; REACTORS; PH;
D O I：
10.1016/j.jhazmat.2020.122898
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
An iron-humic acid (Fe-HA) complex was used as a redox mediator in perchlorate (ClO4-) bioreduction. Bioreduction performance, extracellular polymeric substances (EPS), and microbial community structure were comprehensively explored using different types of anaerobic granular sludge (AnGS) immobilised without the Fe-HA complex (AnGSCON) and with the Fe-HA complex (AnGSFH). The ClO4- was completely removed by AnGSCON by day 20, while the ClO4- was completely removed by AnGSFH by day 6. The AnGS immobilised with the Fe-HA complex significantly increased the ClO4- bioreduction. The acceleration of ClO4- bioreduction was also explained by the mixed liquor volatile suspended solids (MLVSS), MLVSS/mixed liquor suspended solids (MLSS), EPS composition, and microbial community structure. Compared with AnGSCON, the MLVSS and MLVSS/MLSS of the AnGSFH increased 1.4and 1.2-fold, respectively. Humic substances in the EPS were stimulated by the Fe-HA complex. The microbial community structure analysis indicated that perchlorate and quinone reducing bacteria were enriched by the Fe-HA complex. Based on the analysis, the ClO4- bioreduction mechanism of the AnGSFH was revealed because the Fe-HA complex in the AnGS increased the biomass concentration, biological activity, and redox-active mediator and shifted the microbial community structure.
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页数：10
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