Abstract
Perchlorate is a widespread drinking water contaminant with regulatory standards ranging from 2 to 18 μg/L. The hydrogen-based membrane-biofilm reactor (MBfR) can effectively reduce perchlorate, but it is challenging to achieve low-µg/L levels. We explored chlorate addition to increase the abundance of perchlorate-reducing bacteria (PRB) and improve removals. MBfR reactors were operated with and without chlorate addition. Results show that chlorate doubled the abundance of putative PRB (e.g., Rhodocyclales) and improved perchlorate reduction to 23 ± 17 µg/L, compared to 53 ± 37 µg/L in the control. Sulfate reduction was substantially inhibited during chlorate addition, but quickly recovered once suspended. Our results suggest that chlorate addition can enhance perchlorate reduction by providing a selective pressure for PRB. It also decreases net sulfate reduction.
Key points
• Chlorate increased the abundance of perchlorate-reducing bacteria
• Chlorate addition improved perchlorate removal
• Chlorate appeared to suppress sulfate reduction
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors gratefully acknowledge the Center for Environmental Science and Technology (CEST) at Notre Dame for their support with analytical equipment.
Funding
This research was supported by the University of Notre Dame-Pontificia Universidad Católica Collaborative Seed Fund, the CEDEUS (Centro de Desarrollo Urbano Sustentable) CONICYT/FONDAP/15110020, FONDECYT 1201134, and National Scholarship for PhD (CONICYT, Chile) 21161573.
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RN, ITV, and MV conceived and designed the research. MV and AOV conducted the experiments and analyzed the data. MV wrote the manuscript. RN, AOV, and ITV revised the manuscript. All authors read and approved the manuscript.
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Vega, M., Ontiveros-Valencia, A., Vargas, I.T. et al. Chlorate addition enhances perchlorate reduction in denitrifying membrane-biofilm reactors. Appl Microbiol Biotechnol 106, 4341–4350 (2022). https://doi.org/10.1007/s00253-022-11976-1
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DOI: https://doi.org/10.1007/s00253-022-11976-1