Abstract
This study presents a successful treatment of biological acidic Se(IV)- and Cd(II)-containing wastewater via the SBR with limited carbon source (100 mg/L COD). Scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS), high solution transmission electron microscopy (HRTEM) and X-ray photoelectron spectrometer (XPS) results verified the formation of elemental Se and CdSe nanoparticles in the sludge. The abundance of genera in the microbial community gradually changed over the treatment phases depending on the Se(IV) and Cd(II) exposure with different influent COD concentrations. The taxa of Proteiniclasticum, Clostridium_sensu_stricto_12, Longilinea and Mycobacterium were dominant. Redundancy analysis (RDA) indicates that COD concentrations had the greatest impact on Zoogloea and Pseudomonas by promoting an increased abundance and decreased abundance, respectively. Overall, the results extended our understanding of the mechanisms and microbial community responding for the Se(IV) and Cd(II) removal under limited carbon availability in acidic wastewater.
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Acknowledgements
This research was supported by the Open Project of Key Laboratory of Environmental Biotechnology, CAS (Grant No. kf2018001), Hunan Provincial Natural Science Foundation of China (2019JJ50507) and the Scientific Research Foundation for Returned Scholars at the University of South China (2018XQD25). The authors thank the lab staff members of Yingjiu Liu and Pingli Cai for guidance of analytical instruments operation.
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Zeng, T., Hu, Q., Zhang, X. et al. Biological Removal of Se and Cd from Acidic Selenite- and Cadmium-containing Wastewater with Limited Carbon Availability. Bull Environ Contam Toxicol 107, 1208–1219 (2021). https://doi.org/10.1007/s00128-021-03302-8
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DOI: https://doi.org/10.1007/s00128-021-03302-8