METHOD AND APPARATUS FOR TREATING WASTE WATER

摘要

PROBLEM TO BE SOLVED: To provide a waste water treatment apparatus capable of preventing the sedimentation of a carrier to the lower part of the air diffusion device arranged in a reaction tank or to the lower part of the air diffusion device of an aeration tank and an apparatus therefor. SOLUTION: Air diffusing devices 3 are arranged to an aeration tank 1 receiving a carrier 2 growing bacteria to biologically treat waste water or to aeration sub-units 1a connected by partition walls 4 containing screens capable of separating the carrier 2, and an air bubbles generator 5 generating air bubbles under the air diffusion devices is arranged and water streams fluidizing the carrier 2 under the air diffusion devices 3 are generated by air bubbles from the air bubbles generator 5 to prevent the sedimentation of the carrier 2 under the air diffusion devices 3. In the waste water treatment apparatus thus constituted, the sedimentation of the carrier 2 under the air diffusion devices 3 is eliminated and the treatment efficiency as the aeration tank is kept and the treatment capacity corresponding to a plan value can be obtained.