SHB decanter rotary type is a suitable for various kinds of intermittent cycle of activated sludge treatment systems (e.g., SBR sewage, etc.), CASS fluid exhaust equipment. This equipment is designed in considering the water surface processing and bottom sludge layer on the quality of drainage effect of water and equipment set up Cao Bi before a floating barrels, guarantees will collect and fluid guarantee not carry on and bottom sludge.