The biological reaction tank is divided into anaerobic tank, anoxic tank and aerobic tank to treat sewage and wastewater containing organic substance, nitrogen and phosphate. And wastewater influent divide into the anaerobic tank and the anoxic tank.
Aerobic tank is filled with cilium biofilm(media) using the adhesive microorganisms and floating microorganisms. Cilium biofilm consisting of cilium and cilium plate move along the flow of the liquid to attach and detatch microorganisms. It is free from any clogging, and fixes the nitrifier which is to increase the nitrification rate.