In this paper, the physiological characteristics and kinetic features of zooglea and filamentous bacteria in activated sludge are analyzed, and the main factors causing the filamentous bulking of low rate oxidation ditch are investigated. 通过分析活性污泥中菌胶团细菌和丝状细菌的生理特性及动力学特征,探讨了导致低负荷氧化沟工艺中丝状菌膨胀的主要限制因子。