PLANT FOR AEROBIC AND ANAEROBIC DIGESTION TREATMENT BY PFR

A plant for aerobic and anaerobic digestion treatment by PFR is provided to maintain a form of the PFR and to make a complete PFR reactor, to reduce an installation time and cost, to increase variety of design to be easily installed. A water-treatment apparatus comprises a reactor(3), sludge separation units(S1, S2, S3), and an air diffusion part(7). The waste water flows into the reactor and aerating and denitrogen processes are advanced in the reactor. A plurality of sludge separation monomers(5) are laminated inside the reactor and the sludge separation unit is segmented. The sludge separation unit separates the sludge by an aeration process by having a stay space collecting a gas rising from a lower part of the reactor. The air diffusion part flows in the gas inside the reactor.