Sustainable treatment of nitrate-containing wastewater by an autotrophic hydrogen-oxidizing bacterium

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dc.contributor.authorChen, Yi-Zhenen
dc.contributor.authorZhang, Li-Juanen
dc.contributor.authorDing, Ling-Yunen
dc.contributor.authorZhang, Yao-Yuen
dc.contributor.authorWang, Xi-Songen
dc.contributor.authorQiao, Xue-Jiaoen
dc.contributor.authorPan, Bao-Zhuen
dc.contributor.authorWang, Zhi-Wuen
dc.contributor.authorXu, Nanen
dc.contributor.authorTao, Hu-Chunen
dc.date.accessioned2022-08-23T13:48:39Zen
dc.date.available2022-08-23T13:48:39Zen
dc.date.issued2022-01en
dc.description.abstractBacteria are key denitrifiers in the reduction of nitrate (NO3--N), which is a contaminant in wastewater treatment plants (WWTPs). They can also produce carbon dioxide (CO2) and nitrous oxide (N2O). In this study, the autotrophic hydrogen-oxidizing bacterium Rhodoblastus sp. TH20 was isolated for sustainable treatment of NO3--N in wastewater. Efficient removal of NO3--N and recovery of biomass nitrogen were achieved. Up to 99% of NO3--N was removed without accumulation of nitrite and N2O, consuming CO2 of 3.25 mol for each mole of NO3--N removed. The overall removal rate of NO3--N reached 1.1 mg L-1 h(-1) with a biomass content of approximately 0.71 g L-1 within 72 h. TH20 participated in NO3--N assimilation and aerobic denitrification. Results from N-15-labeled-nitrate test indicated that removed NO3--N was assimilated into organic nitrogen, showing an assimilation efficiency of 58%. Seventeen amino acids were detected, accounting for 43% of the biomass. Nitrogen loss through aerobic denitrification was only approximately 42% of total nitrogen. This study suggests that TH20 can be applied in WWTP facilities for water purification and production of valuable biomass to mitigate CO2 and N2O emissions. (C) 2022 Published by Elsevier B.V. on behalf of Chinese Society for Environmental Sciences, Harbin Institute of Technology, Chinese Research Academy of Environmental Sciences.en
dc.description.notesThis work was funded by the Shenzhen Fundamental Research Programs (JCYJ20180503182122539, JCYJ20180503182130795, and GXWD20201231165807007-20200810165349001) and the Na-tional Natural Science Foundation of China (51939009) . We appreciate the suggestions and help of Dr. Wei-Min Wu from Stanford University during manuscript preparation.en
dc.description.sponsorshipShenzhen Fundamental Research Programs [JCYJ20180503182122539, JCYJ20180503182130795, GXWD20201231165807007-20200810165349001]; Na-tional Natural Science Foundation of China [51939009]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.ese.2022.100146en
dc.identifier.issn2666-4984en
dc.identifier.other100146en
dc.identifier.urihttp://hdl.handle.net/10919/111602en
dc.identifier.volume9en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectWastewateren
dc.subjectNitrateen
dc.subjectHydrogen-oxidizing bacteriaen
dc.subjectAutotrophic assimilationen
dc.subjectAerobic denitrificationen
dc.titleSustainable treatment of nitrate-containing wastewater by an autotrophic hydrogen-oxidizing bacteriumen
dc.title.serialEnvironmental Science and Ecotechnologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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