National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2019 Feb;274:386-394. doi: 10.1016/j.biortech.2018.11.101. Epub 2018 Dec 5.
In this study, the synergy of high nitrite (NO-N) accumulated partial-denitrification (PD) and anammox in a continuously fed upflow anaerobic sludge blanket (UASB) reactor was verified for simultaneous nitrate (NO-N) and ammonia (NH-N) removal. A 225-days operation demonstrated that the relatively low total nitrogen (TN) concentration of 6.56 mg/L in effluent could be achieved with influent NH-N and NO-N both of 30 mg/L, resulting in a high TN removal of 89.1% at 17.5 °C. Batch tests revealed that the NO-N-to-NO-N transformation ratio (NTR) of PD stabilized at 90% during the whole operation, which played a crucial role in the desirable performance. However, the PD and anammox activity was negatively impacted by the limited mass transfer with serious sludge flotation. Significantly, hydrodynamic mixing optimization by adjusting liquid recirculation ratio effectively enhanced the nitrogen removal. Moreover, protein composition and tightly-bound structure of EPS played an important role in the sludge stability.
在这项研究中，通过连续进料上流式厌氧污泥床（UASB）反应器验证了高亚硝酸盐（NO-N）积累部分反硝化（PD）和厌氧氨氧化之间的协同作用，用于同时去除硝酸盐（NO-N）和氨（NH-N）。225 天的运行结果表明，当进水 NH-N 和 NO-N 均为 30mg/L 时，出水可达到相对较低的总氮（TN）浓度 6.56mg/L，在 17.5°C 时 TN 的去除率高达 89.1%。批处理试验表明，整个运行过程中 PD 的 NO-N 到 NO-N 的转化比（NTR）稳定在 90%，这对良好的性能起着至关重要的作用。然而，PD 和厌氧氨氧化活性受到严重污泥浮选的限制传质的负面影响。值得注意的是，通过调整液体回流比优化水动力混合，有效地增强了氮的去除。此外，EPS 的蛋白质组成和紧密结合结构对污泥稳定性起着重要作用。
