National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
Bioresour Technol. 2022 Oct;361:127693. doi: 10.1016/j.biortech.2022.127693. Epub 2022 Jul 26.
The collapse of mainstream anammox system caused by deterioration of partial nitrification (PN) is easy to occur and it is vital to quickly restore the stable nitrogen elimination performance. Herein, a novel continuous push-flow anaerobic-oxic-anoxic-oxic (AOAO) process treating sewage was used to restore the nitrogen elimination performance rapidly under deteriorated PN. The increased abundances of Nitrospira and Candidatus Nitrotoga was responsible for the deterioration of PN. Effluent total inorganic nitrogen of 8.7 mg N/L and a stable nitrogen removal rate of 0.083 kg N/m·d were obtained with the aerobic hydraulic retention time (HRT) of 3.75 h even PN deteriorated. Endogenous partial denitrification coupled anammox in the anoxic zone was essential to maintain stable nitrogen removal under the deterioration of PN and the anammox contribution increased from 17.2 % to 23.6 %. The AOAO system shows robustness on nitrogen removal even PN deteriorated under the decrease of HRT from 16 to 12 h.
部分硝化（PN）恶化导致主流厌氧氨氧化系统崩溃很容易发生，快速恢复稳定的脱氮性能至关重要。本文采用一种新型连续推流式厌氧-好氧-缺氧-缺氧（AOAO）工艺，在 PN 恶化条件下快速恢复脱氮性能。硝态氮和疑似硝化螺菌属的丰度增加是 PN 恶化的原因。即使 PN 恶化，好氧水力停留时间（HRT）为 3.75 h 时，出水总无机氮为 8.7mgN/L，稳定脱氮速率为 0.083kgN/m·d。缺氧区的内源性部分反硝化耦合厌氧氨氧化对于在 PN 恶化条件下维持稳定脱氮至关重要，厌氧氨氧化的贡献从 17.2%增加到 23.6%。即使在 HRT 从 16 小时减少到 12 小时的情况下，AOAO 系统在 PN 恶化条件下仍具有很强的脱氮能力。
