The conventional activated sludge process is increasingly receiving concerns for its high energy consumption and excess sludge production. To cope with these issues, an A-B process for nitrogen removal via nitritation-denitritation was proposed in previous study which showed the possibility to achieve energy self-sufficient wastewater reclamation. However, nitritation-denitritation in such a process could not be sustained due to excessive COD capture at A-stage. In this study a novel A-B process configuration in which a portion of influent was directed to B-stage was developed for sustainable and stable nitrogen removal via nitrite shunt with minimal impacts on energy recovery. In this process configuration, the bypass flow was found to significantly shape microbial community structure by enriching ammonia oxidizer and denitrifiers against nitrite oxidizer. As the result, about 78% of total nitrogen was removed via nitritation-denitritation. In addition, the potential energy recovery and sludge reduction were not compromised in the proposed A-B process with the bypass of influent to B-stage. It is expected that this study may offer a feasible engineering solution for concurrently achieving direct energy recovery from wastewater at A-stage, and sustainable nitritation-denitritation for nitrogen removal at B-stage.

常规的活性污泥工艺因其高能耗和过量的污泥生产而日益受到关注。为了解决这些问题，在先前的研究中提出了一种通过硝化-反硝化脱氮的AB工艺，该工艺显示出实现能源自给自足的废水回收的可能性。但是，由于在A阶段过度捕获了COD，因此在这种过程中无法持续进行亚硝化反硝化。在这项研究中，开发了一种新颖的AB工艺配置，其中一部分进水被引导至B级，以便通过亚硝酸盐分流器可持续，稳定地去除氮，并且对能量回收的影响最小。在此流程配置中，通过增加氨氧化剂和反硝化剂对亚硝酸盐氧化剂的作用，发现旁路流显着地影响了微生物群落结构。结果，通过硝化-反硝化除去了约78％的总氮。另外，通过将进水旁路到B级，在建议的AB工艺中，潜在的能量回收和污泥减少没有受到影响。预期这项研究将为同时实现A级废水直接能量回收以及B级脱氮的可持续硝化-反硝化提供可行的工程解决方案。通过将进水旁路到B级，在拟议的AB工艺中不会降低潜在的能量回收和污泥减少。预期该研究将提供可行的工程解决方案，以同时在A级实现废水的直接能量回收，并在B级实现可持续的硝化-反硝化以去除氮。通过将进水旁路到B级，在拟议的AB工艺中不会降低潜在的能量回收和污泥减少。预期该研究将提供可行的工程解决方案，以同时在A级实现废水的直接能量回收，并在B级实现可持续的硝化-反硝化以去除氮。