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Enhanced anammox performance under lower nitrite accumulation in modified partial nitritation-anammox (PN/A) process
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-06-20 , DOI: 10.1016/j.biortech.2024.131018
Qiongpeng Dan 1 , Tong Wang 1 , Jianwei Li 1 , Qiong Zhang 1 , Yongzhen Peng 1
Affiliation  

Higher nitrite accumulation, which is challenging to achieve reliably, is always sought to obtain better nitrogen removal performance in traditional partial nitritation-anammox (PN/A) process. This study developed a modified PN/A process by introducing nitrite-oxidizing bacteria and endogenous metabolism. Advanced nitrogen removal performance of 95.5 % was achieved at a low C/N ratio of 2.7 under nitrite accumulation ratio (NAR) fluctuations. Higher nitrate accumulation at lower NAR (70 ∼ 40 %) resulted in superior anammox contribution (60 ∼ 75 %) and nitrogen removal performance (93 ∼ 98 %). This was attributed to the higher nitrogen removal efficiency of the post-anoxic endogenous partial denitrification coupling anammox process, although the PN/A process occurring first possessed a faster anammox rate of 2.0 mg NH-N /(g VSS⋅h). The introduction of nitrate allowed more nitrite flow to anammox, promoting a high enrichment of anammox bacteria ( Brocadia, 0.3 % to 2.8 %). This study provides new insights into the practical application of the PN/A process.

中文翻译:


改进的部分亚硝化-厌氧氨氧化 (PN/A) 工艺中亚硝酸盐积累较低,提高了厌氧氨氧化性能



在传统的部分亚硝化-厌氧氨氧化(PN/A)工艺中,为了获得更好的脱氮性能,始终寻求更高的亚硝酸盐积累,而可靠地实现这一点具有挑战性。本研究通过引入亚硝酸盐氧化细菌和内源代谢开发了一种改进的 PN/A 工艺。在亚硝酸盐累积率 (NAR) 波动的情况下,在 2.7 的低 C/N 比下,实现了 95.5% 的先进脱氮性能。较低的 NAR (70 ∼ 40 %) 下较高的硝酸盐积累导致了优异的厌氧氨氧化贡献 (60 ∼ 75 %) 和脱氮性能 (93 ∼ 98 %)。这归因于缺氧后内源部分反硝化耦合厌氧氨氧化过程的较高脱氮效率,尽管首先发生的PN/A过程具有更快的厌氧氨氧化速率,为2.0 mg NH-N /(g VSS·h)。硝酸盐的引入使得更多的亚硝酸盐流向厌氧氨氧化菌,促进了厌氧氨氧化菌的高度富集(Brocadia,0.3%至2.8%)。这项研究为 PN/A 流程的实际应用提供了新的见解。
更新日期:2024-06-20
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