Journal
BIORESOURCE TECHNOLOGY
Volume 250, Issue -, Pages 239-246Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.11.044
Keywords
Sb(V)-reduction; Electron donors; Microbial communities; Pyrosequencing; Antimony trioxide microcrystals
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [NRF-2015R1A2A1A15054528]
- Ministry of Education [NRF-2017R1D1A1B03029180]
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This study aims to enrich Sb(V)-reducing bacterial communities from Sb-contaminated soils using various electron donors for bioremediation of Sb-contaminated sites and recovery of Sb from wastewater. When the organic electron donors were used, Sb(V) reduction rates were 2-24 times faster but electron recoveries were 24-59% lower compared to the culture using inorganic electron donor. The morphological crystallizations of the antimony-reduced precipitates were completely different depending on the electron donor. Different microbial populations were enriched with various electron donors but most commonly, only Proteobacteria and Firmicutes phyla were enriched from a diversified soil microbial community. Geobacter sp. seemed to be an important bacterium in organic electron donors-fed cultures whereas an unclassified Rhodocyclaceae was dominant in inorganic electron donor-fed cultures. The results indicated that organic electron donors especially sugar groups were preferable options to obtain rapid Sb(V)-reduction whereas inorganic electron donor like H-2 was better option to achieve high electron recovery.
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