Biological waste water treatment apparatus and a method of producing the same

摘要

A rotating disc-type biological waste water treatment apparatus comprises rotating disc assemblies rotatively driven while their lower halves are immersed in waste water. This rotating disc assemblies include a plurality of impellers, each comprises two parallel discs fixed to a main shaft, one of the discs being formed at its center with a suction opening, and impeller blades radial to the main shaft between the two discs, thereby increasing the surface areas of the rotating disc assemblies without increasing the driving power. Besides, only by closing the outer peripheries of the two discs the apparatus can perform the anaerobic denitrification.