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Removal of ammonium and nitrate through Anammox and FeS-driven autotrophic denitrification
An autotrophic denitrifying bioreactor with iron sulfide (FeS) as the electron donor was operated to remove ammonium (NH4+) and nitrate (NO3−) synergistically from wastewater for more than 298 d. The concentration of FeS greatly affected the removal of NH4+/NO3−. Additionally, a low hydraulic retention time worsened the removal efficiency of NH4+/NO3−. When the hydraulic retention time was 12 h, the optimal removal was achieved with NH4+ and NO3− removal percentages both above 88%, and the corresponding nitrogen removal loading rates of NH4+ and NO3− were 49.1 and 44.0 mg/(L·d), respectively. The removal of NH4+ mainly occurred in the bottom section of the bioreactor through sulfate/ferric reducing anaerobic ammonium oxidation (Sulfammox/Feammox), nitrification, and anaerobic ammonium oxidation (Anammox) by functional microbes such as Nitrospira, Nitrosomonas, and Candidatus Kuenenia. Meanwhile, NO3− was mainly removed in the middle and upper sections of the bioreactor through autotrophic denitrification by Ferritrophicum, Thiobacillus, Rhodanobacter, and Pseudomonas, which possessed complete denitrification-related genes with high relative abundances.
Removal of ammonium and nitrate through Anammox and FeS-driven autotrophic denitrification
An autotrophic denitrifying bioreactor with iron sulfide (FeS) as the electron donor was operated to remove ammonium (NH4+) and nitrate (NO3−) synergistically from wastewater for more than 298 d. The concentration of FeS greatly affected the removal of NH4+/NO3−. Additionally, a low hydraulic retention time worsened the removal efficiency of NH4+/NO3−. When the hydraulic retention time was 12 h, the optimal removal was achieved with NH4+ and NO3− removal percentages both above 88%, and the corresponding nitrogen removal loading rates of NH4+ and NO3− were 49.1 and 44.0 mg/(L·d), respectively. The removal of NH4+ mainly occurred in the bottom section of the bioreactor through sulfate/ferric reducing anaerobic ammonium oxidation (Sulfammox/Feammox), nitrification, and anaerobic ammonium oxidation (Anammox) by functional microbes such as Nitrospira, Nitrosomonas, and Candidatus Kuenenia. Meanwhile, NO3− was mainly removed in the middle and upper sections of the bioreactor through autotrophic denitrification by Ferritrophicum, Thiobacillus, Rhodanobacter, and Pseudomonas, which possessed complete denitrification-related genes with high relative abundances.
Removal of ammonium and nitrate through Anammox and FeS-driven autotrophic denitrification
Front. Environ. Sci. Eng.
Wang, Yanfei (Autor:in) / Zheng, Xiaona (Autor:in) / Wu, Guangxue (Autor:in) / Guan, Yuntao (Autor:in)
01.06.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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