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Open AccessArticle

Effect of Nitrate and Perchlorate on Selenate Reduction in a Sequencing Batch Reactor

1
Department of Environmental Engineering, Soil Environment Research Center, Jeonbuk National University, Jeonju 54896, Korea
2
Gangto Engineering Co. Ltd., Anyang 14058, Korea
3
Department of Civil and Environmental Engineering, Wonkwang University, Iksan 54538, Korea
*
Author to whom correspondence should be addressed.
Processes 2020, 8(3), 344; https://doi.org/10.3390/pr8030344
Received: 12 February 2020 / Revised: 7 March 2020 / Accepted: 13 March 2020 / Published: 16 March 2020
(This article belongs to the Special Issue Bioprocess Monitoring and Control)
Selenate removal from a water body is being vigorously debated owing to severe health impact, but inhibitions of coexisting anions have been reported. To suggest a viable treatment option, this study investigates the effect of nitrate and perchlorate on selenate reduction in a laboratory-scale sequencing batch reactor. The experimental design tests how competing electron acceptors (NO3 and ClO4) and electron donor (acetate) limitations affect selenate reduction in the reactor. Results show that the reactor achieves almost complete selenate reduction within the initial concentration ranges of 0.1–1 mM by enriching selenate-reducing bacteria with appropriate temperature (30 °C) and acclimation period (50 days). We monitored simultaneous selenate and nitrate reduction in the reactor without specific inhibition due to a difference in microbial growth strategy related to electron donor status. Lack of perchlorate-reducing bacteria makes perchlorate addition (0.2 mM) not to be closely associated with dissimilative perchlorate reduction. These results provide information that can help us to understand the effect of competing electron acceptors on selenate reduction and the kinetics of potential parallel reactions in the reactor. View Full-Text
Keywords: biological selenate reduction; electron donor competition; nitrate; perchlorate; sequencing batch biological selenate reduction; electron donor competition; nitrate; perchlorate; sequencing batch
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MDPI and ACS Style

Kim, H.-W.; Hong, S.H.; Choi, H. Effect of Nitrate and Perchlorate on Selenate Reduction in a Sequencing Batch Reactor. Processes 2020, 8, 344.

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