The use of a fully mixed flow inside a single reaction chamber enhances the good contact of the microorganisms with the influent substrate to facilitate the biochemical reaction. The push flow between multiple reaction chambers is formed to form a high mass transfer driving force, which improves the reaction rate, treatment effect and processing capacity of the system.

The push-flow reactor has a greater mass transfer driving force than a fully mixed-flow reactor. Under the same conditions, the push flow fluidized reactor can achieve better treatment results than the fully mixed fluid state reactor.

In the flow state of N series-connected fully mixed reactors, when N=1, it is a complete mixed flow, and when N tends to ∞, it is a push flow.