National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2022 Jun;354:127188. doi: 10.1016/j.biortech.2022.127188. Epub 2022 Apr 19.
Partial-denitrification (PD, NO-N → NO-N) is emerging as a promising approach for application of anaerobic ammonium oxidation (anammox) process. In this study, stable PD with high nitrite (NO-N) accumulation was achieved by modulating nitrate (NO-N) reduction activity and carbon metabolism. With the influent NO-N increasing from 30 to 200 mg/L, specific NO-N reduction rates (r) were significantly improved, corresponding to the nitrate-to-nitrite transforming ratio (NTR) increasing rapidly to 80.0% within just 70 days. The required COD/NO-N decreased from 4.5 to 2.0 and the carbon flux was more shared in NO-N reduction to NO-N. Notably, Thauera spp. as core denitrifying bacteria was highly enriched with the relative abundance of 70.5%∼82.1% despite different inoculations. This study provided a new insight into inducing high NO-N accumulation and promoting practical application of anammox technology.
部分反硝化（PD，NO-N→NO-N）作为一种应用厌氧氨氧化（anammox）工艺的有前途的方法正在出现。在这项研究中，通过调节硝酸盐（NO-N）还原活性和碳代谢，实现了稳定的高亚硝酸盐（NO-N）积累的 PD。随着进水 NO-N 从 30 增加到 200mg/L，特定的 NO-N 还原率（r）显著提高，相应的硝酸盐到亚硝酸盐转化比（NTR）在短短 70 天内迅速增加到 80.0%。所需的 COD/NO-N 从 4.5 降低到 2.0，并且碳通量更多地用于 NO-N 还原为 NO-N。值得注意的是，尽管接种不同，但作为核心反硝化菌的 Thauera spp. 的相对丰度仍高度富集，为 70.5%∼82.1%。本研究为诱导高 NO-N 积累和促进 anammox 技术的实际应用提供了新的见解。
