College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China.
College of Hydraulic Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
Bioresour Technol. 2022 May;352:127060. doi: 10.1016/j.biortech.2022.127060. Epub 2022 Mar 26.
The unstability of mainstream nitritation at low temperature has always been a limiting factor for the nitrogen removal from domestic wastewater by anammox. In this study, the competitive inhibition caused by the organics has been demonstrated as an effective strategy to rapidly and stably achieve mainstream nitritation. This strategy was based on our novel discovery that nitrite-oxidizing bacteria (NOB) was more susceptible to the organics inhibition than ammonia-oxidizing bacteria (AOB). Batch tests showed while NOB activity gradually decreased by 66.5%, AOB activity only decreased by 31.6% with the initial C/N ratio raising from 0.0 to 3.0. Furthermore, treating the actual domestic wastewater at 14-18 °C, mainstream nitritation was rapidly established within 12 days and then the nitrite accumulation ratio was stable at ∼92.1% during a long-term operation. This strategy could be easily and effectively applied in urban WWTPs through modifying the operation mode.
低温下主流硝化的不稳定性一直是厌氧氨氧化从生活污水中脱氮的一个限制因素。在这项研究中，有机污染物的竞争抑制被证明是一种快速稳定实现主流硝化的有效策略。该策略基于我们的新发现，即亚硝酸盐氧化菌（NOB）比氨氧化菌（AOB）更容易受到有机物的抑制。批处理实验表明，随着初始 C/N 比从 0.0 升高到 3.0，NOB 活性逐渐下降 66.5%，而 AOB 活性仅下降 31.6%。此外，在 14-18°C 下处理实际生活污水，在 12 天内迅速建立了主流硝化，然后在长期运行中，亚硝酸盐积累比稳定在约 92.1%。通过修改运行模式，该策略可以很容易且有效地应用于城市污水处理厂。
