College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, China.
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou 510275, China.
Bioresour Technol. 2024 Aug;406:131070. doi: 10.1016/j.biortech.2024.131070. Epub 2024 Jul 4.
In this study, two bioprocess models were first constructed with the newly-discovered comammox process described as one-step and two-step nitrification and evaluated against relevant experimental data. The validated models were then applied to reveal the potential effect of comammox bacteria on the granular bioreactor particularly suitable for undertaking partial nitritation/anammox (PN/A) under different operating conditions of bulk dissolved oxygen (DO) and influent NH. The results showed although comammox bacteria-based PN/A could achieve > 80.0 % total nitrogen (TN) removal over a relatively wider range of bulk DO and influent NH (i.e., 0.25-0.40 g-O/m and 470-870 g-N/m, respectively) without significant nitrous oxide (NO) production (< 0.1 %), the bulk DO should be finely controlled based on the influent NH to avoid the undesired full nitrification by comammox bacteria. Comparatively, conventional ammonium-oxidizing bacteria (AOB)-based PN/A not only required higher bulk DO to achieve > 80.0 % TN removal but also suffered from 1.7 %∼2.8 % NO production.
在这项研究中，首先构建了两个生物过程模型，新发现的 comammox 过程被描述为一步和两步硝化，并根据相关实验数据进行了评估。然后，将经过验证的模型应用于揭示 comammox 细菌对特别适合进行部分亚硝化/厌氧氨氧化（PN/A）的颗粒生物反应器的潜在影响，在不同的总溶解氧（DO）和进水氨（NH）的操作条件下。结果表明，尽管基于 comammox 细菌的 PN/A 可以在相对较宽的 DO 和进水 NH 范围内（即 0.25-0.40 g-O/m 和 470-870 g-N/m）实现>80.0%的总氮（TN）去除，而不会产生显著的氧化亚氮（NO）（<0.1%），但应根据进水 NH 精细控制 DO，以避免 comammox 细菌的非预期完全硝化。相比之下，传统的氨氧化细菌（AOB）为基础的 PN/A 不仅需要更高的 DO 才能实现>80.0%的 TN 去除，而且还会产生 1.7%∼2.8%的 NO 生成。
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