Partial nitritation/anammox can provide energy-efficient nitrogen removal from the main stream of municipal wastewater. The main bottleneck is the growth of nitrite oxidizing bacteria (NOB) at low temperatures (<15 °C). To produce effluent suitable for anammox, real municipal wastewater after anaerobic pretreatment was treated by enriched ammonium oxidizing bacteria (AOB) in suspended sludge SBR at 12 °C. NOB were continually washed out using aerobic duration control strategy (ADCS). Solids retention time was set to 9–16 days. Using this approach, average ammonia conversion higher than 57% at high oxidation rate of 0.4 ± 0.1 kg-N kg-VSS^–1 d^–1 was achieved for more than 100 days. Nitrite accumulation (N–NO₂^–/N–NO_X) of 92% was maintained. Thus, consistently small amounts of present NOB were efficiently suppressed. Our mathematical model explained how ADCS enhanced the inhibition of NOB growth via NH₃ and HNO₂. This approach will produce effluent suitable for anammox even under winter conditions in mild climates.

中文翻译：

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厌氧厌氧预处理后城市废水的高速率部分硝化

部分硝化/厌氧氨水可以从市政废水的主流中去除高能效的氮。主要瓶颈是在低温（<15°C）下亚硝酸盐氧化细菌（NOB）的生长。为了生产适合厌氧氨水的废水，厌氧预处理后的实际市政废水通过在12°C的悬浮污泥SBR中富集的氨氧化细菌（AOB）进行处理。使用有氧持续时间控制策略（ADCS）持续冲洗NOB。固体保留时间设置为9-16天。使用这种方法，在超过100天的时间里，在0.4±0.1 kg-N kg-VSS ^–1 d ^–1的高氧化速率下，平均氨转化率高于57％。亚硝酸盐积累（N–NO ₂ ^– / N–NO _X）保持92％。因此，始终有效地抑制了当前少量的NOB。我们的数学模型解释了ADCS如何通过NH ₃和HNO ₂增强NOB的抑制作用。即使在温和气候下的冬季条件下，这种方法也会产生适合厌氧氨气的废水。