College of Environmental Sciences and Engineering, Department of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.
Beijing Enterprises Water Group Limited Co., Ltd., Beijing 102299, PR China.
Sci Total Environ. 2023 Jun 15;877:162843. doi: 10.1016/j.scitotenv.2023.162843. Epub 2023 Mar 15.
Nowadays, applying anammox to treat high nitrogenous side-stream wastewater has taken a step forward. However, the partial nitritation process is sensitive to the ammonium concentration and the nitrogen loading rate, which significantly influences the nitrogen removal performance. This study investigated the performance of a novel nitritation pilot-scale reactor which was divided into four chambers. The nitrite accumulation efficiency reached more than 90 % in the rural wastewater treatment process. As the reactor was divided into four chambers, the comprehensive statistical results showed that the concentration of free ammonium in the front chambers had been effectively improved. The proportion of free ammonium concentration (>0.1 mg NH·L), which could inhibit the activity of nitrite oxidizing bacteria, in first chamber (PN1) was 2 times higher than in the last chamber (PN4). Meanwhile, Nitrosomonas, responsible for ammonium oxidation to nitrite, was highly enriched in the first two chambers even though the dissolved oxygen was maintained at 1.5 ± 0.3 mg·L. Compare to conventional reactor, the resistance of the novel reactor to volumetric shock loading has been enhanced. Even though the ammonium loading rate fluctuated greatly, the effluent was still stable and could meet the demand following the anammox process. This study demonstrated that the reactor with multi-chambers could effectively improve the nitrite accumulation efficiency in the partial nitritation process and thus provide a new perspective on the partial nitritation process in a single reactor and further promote the anammox performance in the wastewater treatment process.
目前，应用厌氧氨氧化处理高含氮侧流污水已经取得了一定的进展。然而，部分亚硝化过程对氨氮浓度和氮负荷率较为敏感，这会显著影响氮的去除性能。本研究考察了一种新型亚硝化中试规模反应器的性能，该反应器分为四个隔室。在农村污水处理过程中，亚硝酸盐的积累效率超过 90%。由于反应器被分为四个隔室，综合统计结果表明，前几个隔室中的游离氨浓度得到了有效提高。第一个隔室（PN1）中可以抑制亚硝酸盐氧化菌活性的游离氨浓度（>0.1mgNH·L）的比例比最后一个隔室（PN4）高 2 倍。同时，尽管溶解氧保持在 1.5±0.3mg·L，但负责将氨氧化为亚硝酸盐的硝化菌在第一和第二隔室中得到了高度富集。与传统反应器相比，新型反应器对体积冲击负荷的抵抗力得到了增强。即使氨氮负荷率波动较大，出水仍保持稳定，且满足后续厌氧氨氧化工艺的要求。本研究表明，多隔室反应器可以有效提高部分亚硝化过程中亚硝酸盐的积累效率，为单反应器中的部分亚硝化过程提供了新的视角，并进一步促进了废水处理过程中厌氧氨氧化的性能。
