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<p>The slow start-up process, unsatisfactory nitrogen removal, and long recovery time of sludge dormancy are the bottlenecks for the popularization and application of anaerobic ammonia oxidation technology in wastewater treatment. A new method of inoculating denitrifying sludge and anaerobically digested sludge in the reactor was proposed to realize rapid startup of anaerobic ammonia oxidation reaction. The operational performance of the reactor during startup was investigated. Changes in microbial community structure were analyzed. The process of activity recovery after sludge dormancy and its effect on the treatment of actual wastewater were investigated. The results showed that after the rapid startup of the anaerobic ammonia oxidation reaction, the removal rates of NH<sub>4</sub><sup>+</sup>-N and TN in the reactor reached 98.8% and 88.6%, respectively. Flocculated sludge granulation and succession of dominant genera occurred during reactor operation. Candidatus Brocadia was the only anaerobic ammonia oxidizing bacterial genus detected. Dormant sludge showed better nitrogen removal efficiency for low concentration of municipal wastewater after rapid reactivation. The results may provide a new idea for the rapid initiation of anaerobic ammonia oxidation reaction, which can be popularized and applied in the nitrogen removal process of low concentration domestic wastewater.</p>

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Anammox Biofilm Reactor Inoculated With Denitrification-anaerobic Sludge to Achieve Rapid Start-up and Efficient Treatment of Low Concentration Wastewater

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Li Wu,
  • Lei Zhang,
  • Xingyong Liu,
  • Meng Yang,
  • Sen Liu,
  • Chuanbing Zhang,
  • Yahui Xu

摘要

The slow start-up process, unsatisfactory nitrogen removal, and long recovery time of sludge dormancy are the bottlenecks for the popularization and application of anaerobic ammonia oxidation technology in wastewater treatment. A new method of inoculating denitrifying sludge and anaerobically digested sludge in the reactor was proposed to realize rapid startup of anaerobic ammonia oxidation reaction. The operational performance of the reactor during startup was investigated. Changes in microbial community structure were analyzed. The process of activity recovery after sludge dormancy and its effect on the treatment of actual wastewater were investigated. The results showed that after the rapid startup of the anaerobic ammonia oxidation reaction, the removal rates of NH4+-N and TN in the reactor reached 98.8% and 88.6%, respectively. Flocculated sludge granulation and succession of dominant genera occurred during reactor operation. Candidatus Brocadia was the only anaerobic ammonia oxidizing bacterial genus detected. Dormant sludge showed better nitrogen removal efficiency for low concentration of municipal wastewater after rapid reactivation. The results may provide a new idea for the rapid initiation of anaerobic ammonia oxidation reaction, which can be popularized and applied in the nitrogen removal process of low concentration domestic wastewater.