Implementation of mainstream partial nitritation/anammox (PN/A) can lead to more sustainable and cost-effective sewage treatment. For mainstream PN/A reactor, an integrated fixed-film activated sludge (IFAS) was operated (26 °C). The effects of floccular aerobic sludge retention time (AerSRT_floc), a novel aeration strategy, and N-loading rate were tested to optimize the operational strategy. The best performance was observed with a low, but sufficient AerSRT_floc (~7d) and continuous aeration with two alternating dissolved oxygen setpoints: 10 min at 0.07–0.13 mg O₂ L⁻¹ and 5 min at 0.27–0.43 mg O₂ L⁻¹. Nitrogen removal rates were 122 ± 23 mg N L⁻¹ d⁻¹, and removal efficiencies 73 ± 13%. These conditions enabled flocs to act as nitrite sources while the carriers were nitrite sinks, with low abundance of nitrite oxidizing bacteria. The operational strategies in the source-sink framework can serve as a guideline for successful operation of mainstream PN/A reactors.

主流的部分硝化/厌氧氨氮（PN / A）的实施可以导致更可持续和更具成本效益的污水处理。对于主流的PN / A反应器，运行了集成的固定膜活性污泥（IFAS）（26°C）。的絮状好氧污泥停留时间（AerSRT效果_絮状物），一种新型曝气策略，和N-负荷率进行了测试，以优化操作策略。用低观察到的最好的性能，但是足够AerSRT_絮状物（〜7D）和连续曝气用两个交替的溶解氧设定值：10分钟，0.07-0.13毫克邻₂大号^-1和在0.27-0.43毫克O 5分钟₂大号^-1。脱氮率是122±23 mg NL ^-1 d^-1，去除效率73±13％。这些条件使絮凝物可以充当亚硝酸盐源，而载体是亚硝酸盐汇，亚硝酸盐氧化细菌的丰度低。源汇框架中的运行战略可作为主流PN / A反应堆成功运行的指南。