SEWAGE TREATMENT APPARATUS USING HOLLOW FIBER MEMBRANE MODULE

摘要

PURPOSE:To circulate a mixed liquid by always positioning a hollow fiber membrane module in the mixed liquid even when the water level of the mixed liquid in a treatment tank is varied by providing a large number of hollow fiber membranes moving up and down along with a movable pipe moving up and down corresponding to the fluctuation of a water level and circulating the mixed liquid in the treatment tank. CONSTITUTION:A fixed pipe 7 is set to the central part of a treatment tank 1 and a movable pipe 8 is externally fitted to said fixed pipe 7 so as to be slidable up and down with the rising and falling fluctuation of a water level WL by a buoyancy means 9 such as a float ring. A hollow fiber membrane module 2 and the movable pipe 8 are integrally connected and moved up and down with the fluctuation of the water level. The mixed liquid in the pipes 7, 8 is discharged out of the pipes by a screw 10 to be circulated in the treatment tank. By this constitution, the movable pipe and the hollow fiber membrane module moves up and down corresponding to the fluctuation of the water level of the mixed liquid and the hollow fiber membrane module is positioned in the mixed liquid to make it possible to effectively circulate the mixed liquid.