Print Email Facebook Twitter The key factor in High Pressure Hydrogenotrophic Denitrification Title The key factor in High Pressure Hydrogenotrophic Denitrification: Hydrogen partial pressure Author Zhou, Jianmin (East China University of Science and Technology) Ding, Lei (East China University of Science and Technology) Shi, Mu (East China University of Science and Technology) Lindeboom, R.E.F. (TU Delft Sanitary Engineering) Cui, Changzheng (East China University of Science and Technology) Date 2022 Abstract In the envisaged hydrogen economy, H2 could be an interesting alternative electron donor for the denitrification of drinking water or wastewater. The main obstacle to engineering the hydrogenotrophic denitrification process is the low solubility of H2 in water under atmospheric pressure, which limits denitrification rate and nitrogen removal efficiency. In this paper, we demonstrated a novel configuration of hydrogenotrophic denitrification, namely High Pressure Hydrogenotrophic Denitrification (HPHD). Elevated H2 partial pressure (pH2) was employed to increase dissolved H2 concentration and concomitantly enhance denitrification rate. Our results showed that the specific denitrification rate increased from 9.6 mg N/(gVSS·h) at 0.5 bars to 51.0 mg N/(gVSS·h) at 9 bars in HPHD. The denitrification effect could be retained with elevated pH2 at a low temperature. The specific denitrification rate at 3 bars and 15 °C was 20.5 mg N/(gVSS·h), approximately 1.5 times that at 1 bar and 30 °C, which was quite beneficial for hydrogenotrophic denitrification under cold conditions. Different from nitrite reduction, less impact was observed on nitrate reduction by low temperature, which explained high nitrite accumulation in HPHD at 15 °C. Overall, our investigations shed light on the role of pH2 in the promising solution for nitrogen removal in HPHD. Subject High pressureHydrogenLow temperatureNitrite accumulationSpecific denitrification rate To reference this document use: http://resolver.tudelft.nl/uuid:19970bf0-78a9-46e3-9494-761ee9f432d7 DOI https://doi.org/10.1016/j.jwpe.2022.103195 Embargo date 2023-07-01 ISSN 2214-7144 Source Journal of Water Process Engineering, 49 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Jianmin Zhou, Lei Ding, Mu Shi, R.E.F. Lindeboom, Changzheng Cui Files PDF 1_s2.0_S2214714422006390_main.pdf 1.67 MB Close viewer /islandora/object/uuid:19970bf0-78a9-46e3-9494-761ee9f432d7/datastream/OBJ/view