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<p>The removal of ammonia, nitrate, and nitrite from wastewater is essential for controlling nitrogen pollution. However, the efficiency of biological nitrogen removal is often limited by the scarcity of highly active bacterial strains. In this study, a coculture system, designated YEM003, was constructed using eight nitrogen-metabolizing bacterial strains isolated from the same activated sludge. YEM003 exhibited robust nitrogen removal performance, effectively eliminating ammonia, nitrate, and nitrite from wastewater under varying oxygen conditions. Metagenomic analysis revealed enrichment of key genes involved in nitrogen metabolism and elucidated nitrogen removal pathways of YEM003. Due to the unbalanced abundance distribution of the eight strains in YEM003, the contributions of each strain to the nitrogen removal metabolism in different wastewaters differed significantly. Overall, YEM003 exhibits comprehensive and efficient biological nitrogen removal capabilities and shows strong potential for application in wastewater nitrogen removal processes.</p>

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Characteristics of Multispecies Bacterial Cocultures for the Removal of Ammonia, Nitrate, and Nitrite from Water

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Ya Hu,
  • Ao Li,
  • Shiwen Qiu,
  • Tingting Zhu,
  • Jinling Guo,
  • Wen Zhang,
  • Chunxia Zhao,
  • Yucai Lyu

摘要

The removal of ammonia, nitrate, and nitrite from wastewater is essential for controlling nitrogen pollution. However, the efficiency of biological nitrogen removal is often limited by the scarcity of highly active bacterial strains. In this study, a coculture system, designated YEM003, was constructed using eight nitrogen-metabolizing bacterial strains isolated from the same activated sludge. YEM003 exhibited robust nitrogen removal performance, effectively eliminating ammonia, nitrate, and nitrite from wastewater under varying oxygen conditions. Metagenomic analysis revealed enrichment of key genes involved in nitrogen metabolism and elucidated nitrogen removal pathways of YEM003. Due to the unbalanced abundance distribution of the eight strains in YEM003, the contributions of each strain to the nitrogen removal metabolism in different wastewaters differed significantly. Overall, YEM003 exhibits comprehensive and efficient biological nitrogen removal capabilities and shows strong potential for application in wastewater nitrogen removal processes.