Thauera sp. in Hydrogen-Based Denitrification: Effects of Plentiful Bicarbonate Supplementation on Powerful Nitrite Reducer

Suphatchai Rujakom (), Tatsuru Kamei and Futaba Kazama
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Suphatchai Rujakom: School of Interdisciplinary Studies, Mahidol University Kanchanaburi Campus, No. 199, Moo 9, Lumsum Sub-District, Saiyok District, Kanchanaburi 71150, Thailand
Tatsuru Kamei: Interdisciplinary Research Centre for River Basin Environment, University of Yamanashi, 4-4-37 Takeda, Kofu 400-0016, Yamanashi, Japan
Futaba Kazama: Interdisciplinary Research Centre for River Basin Environment, University of Yamanashi, 4-4-37 Takeda, Kofu 400-0016, Yamanashi, Japan

Sustainability, 2022, vol. 15, issue 1, 1-13

Abstract: Nitrite accumulation in hydrogen-based denitrification (HD) has been reported as a difficulty for achieving complete denitrification. Thauera sp. has been found as the dominant bacterial species in HD previously when using a plentiful amount of HCO 3 − . This present study was successful in isolating Pseudomonas sp., Dietzia sp., Pannonibacter sp., Halomonas sp., Bacillus sp., and Thauera sp. These isolated strains were selected for investigating the nitrogen removal performance under the plentiful HCO 3 − condition. Only Pseudomonas sp. and Thauera sp. were capable of removing NO 2 − where the specific NO 2 − removal rate of Thauera sp. (36.02 ± 5.66 mgN gVSS −1 day −1 ) was 9 times quicker than that of Pseudomonas sp. (3.94 ± 0.80 mgN gVSS −1 day −1 ). The Thauera sp. strain was then tested at different HCO 3 − amounts. As a result, Thauera sp. had no ability to function both NO 3 − and NO 2 − removals under HCO 3 − deficit condition. This study provided evidence on the role of Thauera sp. and the necessity of bicarbonate in the hydrogen-based denitrification process to enhance its efficiency and to simultaneously reduce the operational cost especially for hydrogen.

Keywords: hydrogen-based denitrification; autotrophic denitrification; inorganic carbon; bicarbonate; Thauera; nitrogen removal; nitrite; water quality (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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