The MBBR process principle is to increase the biomass and species in the reactor by adding a certain amount of suspension carrier to the reactor, so as to improve the treatment efficiency of the reactor. Because the density of the filler is close to that of water, it is completely mixed with water during aeration, and the environment for microbial growth is gas, liquid and solid. The collision and shear effect of the carrier in the water makes the air bubbles finer and increases the utilization rate of oxygen. In addition, each carrier has different biological species inside and outside, some anaerobic bacteria or facultative bacteria grow inside, and the outside is good trophic bacteria, so that each carrier is a miniature reactor, so that nitrification reaction and denitrification reaction exist at the same time, so as to improve the treatment effect.
