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<p>The practical application of the Feammox for nitrogen removal is challenging in the presence of high amounts of oxygen and organic carbon. This study presents a novel approach to address this issue which involves enhancing biological nitrogen removal in a magnetic zeolite modified intermittently aerated sequential biological reactor (MZeo-IASBR). The MZeo-IASBR demonstrated excellent performance, achieving 99.09% NH<sub>4</sub><sup>+</sup>-N and 89.12% TN removal efficiencies. The relative abundances of <i>Proteobacteria</i>, <i>Planctomycetota</i>, and <i>Chloroflexi</i> at the phylum level and <i>Delftia</i> and <i>Pirellula</i> at the genus level increased with the addition of NZ@Fe<sub>3</sub>O<sub>4</sub>, when compared to the microbial community analysis results of the IASBR with no addition of supplements and Zeo-IASBR with the addition of natural zeolite. The genera <i>Acinetobacter</i> and <i>Bdellovibrio</i> were mainly observed in the MZeo-IASBR system, and <i>Acinetobacter</i> may be related to the Feammox process. The combination of NZ@Fe<sub>3</sub>O<sub>4</sub> and intermittent aeration under low oxygen levels promoted the aggregation of aerobic denitrifying bacteria and iron-reducing bacteria, which predominately removed nitrogen through the integration of simultaneous nitrification and denitrification (SND), Feammox, anammox, and NDFO processes. The MZeo-IASBR represents a promising strategy for advanced nitrogen removal in wastewater treatment, offering considerable supports for the practical application of Feammox processes.</p>

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Enhanced nitrogen removal via simultaneous nitrification-denitrification (SND) and Feammox in a magnetic zeolite modified intermittently aerated sequential biological reactor

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Min Pan,
  • Tao Jiang,
  • Zihan Wang,
  • Xuanzhao Huang,
  • Shiji Liu,
  • Xiaoming Huang

摘要

The practical application of the Feammox for nitrogen removal is challenging in the presence of high amounts of oxygen and organic carbon. This study presents a novel approach to address this issue which involves enhancing biological nitrogen removal in a magnetic zeolite modified intermittently aerated sequential biological reactor (MZeo-IASBR). The MZeo-IASBR demonstrated excellent performance, achieving 99.09% NH4+-N and 89.12% TN removal efficiencies. The relative abundances of Proteobacteria, Planctomycetota, and Chloroflexi at the phylum level and Delftia and Pirellula at the genus level increased with the addition of NZ@Fe3O4, when compared to the microbial community analysis results of the IASBR with no addition of supplements and Zeo-IASBR with the addition of natural zeolite. The genera Acinetobacter and Bdellovibrio were mainly observed in the MZeo-IASBR system, and Acinetobacter may be related to the Feammox process. The combination of NZ@Fe3O4 and intermittent aeration under low oxygen levels promoted the aggregation of aerobic denitrifying bacteria and iron-reducing bacteria, which predominately removed nitrogen through the integration of simultaneous nitrification and denitrification (SND), Feammox, anammox, and NDFO processes. The MZeo-IASBR represents a promising strategy for advanced nitrogen removal in wastewater treatment, offering considerable supports for the practical application of Feammox processes.