Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 398, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122898
Keywords
Iron-humic acid complex; Perchlorate; Bioreduction; Performance; Extracellular polymeric substances; Microbial community structure
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Funding
- National Natural Science Foundation of China [51678387]
- Talented Training Project of Hebei Province [A201902019]
- Key Project of Hebei Province Higher Education Science and Technology Research Foundation [ZD2019038]
- Youths Project of Hebei Province Higher Education Science and Technology Research Foundation [QN2018062]
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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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