Abstract
In this study, heat-pretreated sulfate-reducing bacteria (SRBs) were evaluated for simultaneous sulfate and nitrate removal in a bioelectrochemical system (BES). The effect of the applied potential of 20 mV to SRBs was evaluated at a sulfate concentration of 3 g/L and/or nitrate concentration of 0.5 g/L supplemented before heat pretreatment for sulfate and nitrate removal. The highest H2 production of 2.24 ± 0.04 mM/L in heat-pretreated culture was observed in the presence of sulfate at an applied potential of 20 mV (BHE-S). Simultaneous reduction of sulfate and nitrate was significant in BESs supplemented with either sulfate or nitrate during heat-shock pretreatment of the culture. The highest SO42− removal of 88.91 ± 0.8% was found in culture heat pretreated with NO3− and applied with 20 mV potential (BHE-N). The kinetics of heat-pretreated culture showed higher R2 and ultimate potential for H2 on the continuous application of 20 mV potential.
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Acknowledgements
One of the authors Dhar V. is grateful to the University Grants Commission (UGC), New Delhi for providing a Non-NET Fellowship. We also thank Mr. Kailash Bahuguna (Chief Operating Officer, Zydus Infrastructure Pvt. Ltd.) for providing the anaerobic sludge and other technical help required for the research study.
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VD: Investigation, methodology, data curation, formal analysis and data interpretation, writing—original draft. RS: Methodology, Writing—review and editing, validation, supervision. All authors read and approved the final manuscript.
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Dhar, V., Singh, R. Biohydrogen production potential with sulfate and nitrate removal by heat-pretreated enriched sulfate-reducing microorganisms-based bioelectrochemical system. Arch Microbiol 205, 7 (2023). https://doi.org/10.1007/s00203-022-03352-4
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DOI: https://doi.org/10.1007/s00203-022-03352-4