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The study utilized a sequencing batch reactor (SBR) to initiate the Simultaneous nitritation, anammox and denitrification (SNAD) processSimultaneous Nitritation, Anammox and Denitrification (SNAD) process, using low-concentration municipal wastewater as the treatment object, to investigate the synergistic regulationSynergistic regulation mechanism between pHPH and dissolved oxygenDissolved oxygen (DO). A DO gradient (0–10 days: 1.5–2.0 mg/L; after 10 days: 0.5–1.0 mg/L) and pHPH dynamic equilibrium (7.0–7.5) were set to analyze the effects on ammonia nitrogen removal efficiency. The results showed that the total nitrogen (TN) removal efficiency fluctuated from 20 to 40%, while the ammonia nitrogen removal efficiency was poor. The reason was that the high DO in the start-up period caused excessive oxidation of ammonia nitrogen and inhibited anaerobic ammonia oxidizing bacteria, and the microbial community was slow to adapt and synergistic effects were not effectively established in the stabilization period with low DO, and the fluctuation of pHPH control was still difficult to be controlled by the addition of NaHCO3, affecting the activity of the key enzymes and leading to the low efficiency of nitrogen removal. This study revealed the problems in the synergistic control of DO and pHPH, and provided a direction for the subsequent optimization of the SNAD processSimultaneous Nitritation, Anammox and Denitrification (SNAD) process.

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Study of pH Dynamic Equilibrium and Dissolved Oxygen Synergistically Regulating the Performance of SNAD Process for Nitrogen Removal

  • 会议论文

  • 发表日期：

    2026年

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  • Xu Chen,
  • Lihui Zhan,
  • Zhouzhenyang Xia,
  • Jiajun Luo,
  • Ze Bao,
  • Yicheng Wu,
  • Haiyan Fu

摘要

The study utilized a sequencing batch reactor (SBR) to initiate the Simultaneous nitritation, anammox and denitrification (SNAD) processSimultaneous Nitritation, Anammox and Denitrification (SNAD) process, using low-concentration municipal wastewater as the treatment object, to investigate the synergistic regulationSynergistic regulation mechanism between pHPH and dissolved oxygenDissolved oxygen (DO). A DO gradient (0–10 days: 1.5–2.0 mg/L; after 10 days: 0.5–1.0 mg/L) and pHPH dynamic equilibrium (7.0–7.5) were set to analyze the effects on ammonia nitrogen removal efficiency. The results showed that the total nitrogen (TN) removal efficiency fluctuated from 20 to 40%, while the ammonia nitrogen removal efficiency was poor. The reason was that the high DO in the start-up period caused excessive oxidation of ammonia nitrogen and inhibited anaerobic ammonia oxidizing bacteria, and the microbial community was slow to adapt and synergistic effects were not effectively established in the stabilization period with low DO, and the fluctuation of pHPH control was still difficult to be controlled by the addition of NaHCO3, affecting the activity of the key enzymes and leading to the low efficiency of nitrogen removal. This study revealed the problems in the synergistic control of DO and pHPH, and provided a direction for the subsequent optimization of the SNAD processSimultaneous Nitritation, Anammox and Denitrification (SNAD) process.