Robustness of an activated sludge system, describing uncertainty and operational risk, was evaluated using the absence or presence of calcium-induced enhancement of respiration (CaER) effect. Generally, the fast-growing system was susceptible to external environmental variations, of which the sludge exhibited significant CaER effect under normal operational conditions, while the slow growing system showed less significant CaER effect. However, sludge in both systems exhibited CaER effect under stressed conditions of decreasing temperature or ammonia shocking. Therefore, the absence of CaER effect indicates a more robust system, while the presence of CaER effect indicates a susceptible system. Additionally, a method to identify safe and dangerous shocking was established by a hybrid usage of absence or presence of CaER effect and recovery index (RI) curve type. The evaluation of robustness could help determining when adjustment should be really taken to cope with the uncertainty, and thus holds a high promise for field application.

使用或不使用钙诱导的呼吸增强作用（CaER）对活性污泥系统的稳健性（描述不确定性和操作风险）进行了评估。通常，快速增长的系统易受外部环境变化的影响，其中污泥在正常运行条件下表现出显着的CaER效应，而缓慢增长的系统则表现出较不显着的CaER效应。然而，在降低温度或氨冲击的压力条件下，两个系统中的污泥均表现出CaER效应。因此，CaER效应的缺失表明系统更健壮，而CaER效应的存在表明系统易受影响。此外，通过将不存在或存在CaER效应和恢复指数（RI）曲线类型混合使用，建立了一种识别安全和危险电击的方法。鲁棒性评估可以帮助确定何时应真正进行调整以应对不确定性，因此对现场应用具有很高的希望。