In this research, a final equation to calculate hydraulic retention time ( HRT) in the MBR is successfully derived from reaction kinetics model of the organic degradation, membrane fouling kinetics model and simplification of the HRT formula. 根据有机物降解反应动力学模型和膜污染反应动力学模型,结合实验数据对水力停留时间公式进行了简化,并最终建立了MBR水力停留时间(HRT)的计算公式。