Solid-Phase Fe(II)-Mediated Autotrophic Denitrification for Nitrate Removal from Wastewater with a Low Carbon-to-Nitrogen Ratio
Publication: Journal of Environmental Engineering
Volume 146, Issue 7
Abstract
In this study, three solid-phase iron sources—FeS, , and sponge iron—were used to investigate the autotrophic denitrification efficiency in low-carbon-to-nitrogen () wastewater. Among these iron sources, FeS obtained the best efficiency, with a nitrate removal of 96% at 120 h under and . Then, batch experiments with FeS as an electron donor were conducted to evaluate the effect of different influent ratios and concentrations. According to the results of the experiments, the nitrate removal efficiency of the mixotrophic system was greater than that of the pure autotrophic system under low- ratios, and the TN (total nitrogen) removal efficiency was also enhanced. In the mixotrophic system, the nitrate removal reached 98% in 48 h under a ratio of 1, and was in the range of to . Additionally, some accumulation of ammonia was observed in the nitrogen conversion process. According to microbial analysis, the synergistic action of heterotrophic and autotrophic denitrifiers improved nitrate removal.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study was supported by Science and Technology Support Program of Jiangsu Province (BE2016357) and a project founded by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.
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Journal of Environmental Engineering
Volume 146 • Issue 7 • July 2020
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©2020 American Society of Civil Engineers.
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Received: Nov 19, 2019
Accepted: Feb 24, 2020
Published online: May 13, 2020
Published in print: Jul 1, 2020
Discussion open until: Oct 13, 2020
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