This study developed an innovative A-B process for enhanced nutrients removal in municipal wastewater reclamation, in which a micro-aerated moving bed biofilm reactor served as A-stage and a step-feed sequencing batch reactor (SBR) as B-stage. In the A-stage, 55% of COD and 15% of ammonia nitrogen was removed, while more than 88% of the total nitrogen was removed via nitritation and denitritation, together with 93% of phosphorous removal at the B-stage where ammonia oxidizing bacteria activity was significantly higher than nitrite oxidizing bacteria activity. Meanwhile substantial phenotype of polyphosphate accumulating organisms (PAOs) was also observed in the B-stage SBR. Fluorescence in situ hybridization revealed that Accumulibacter was the dominant PAOs with undetectable Competibacter. Compared to the conventional activated sludge process, the proposed A-B process could offer a more cost-effective alternative for enhanced biological nutrients removal from municipal wastewater with less energy consumption.

中文翻译：

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在市政污水再生中增强生物营养去除能力的新型AB工艺

这项研究开发了一种创新的AB工艺，用于在市政废水回收中提高去除营养的能力，其中微充气的移动床生物膜反应器用作A级，分步进料顺序批处理反应器（SBR）作为B级。在A阶段，去除了55％的COD和15％的氨氮，而通过硝化和反硝化去除了总氮的88％以上，以及在B阶段将氨氧化的磷去除了93％。细菌活性显着高于亚硝酸盐氧化细菌活性。同时，在B期SBR中也观察到了多磷酸盐蓄积生物（PAOs）的实质表型。荧光原位杂交显示，Accumulibacter是占主导地位的PAOs，无法检测到竞争杆菌。与传统的活性污泥工艺相比，拟议的AB工艺可以提供一种更具成本效益的替代方案，从而以更低的能耗来提高市政污水中生物营养的去除率。