Sewage treatment equipment using hollow fiber membrane module

摘要

PURPOSE:To circulate a mixed liquid even when the level of the mixed liquid in a treatment tank is varied by packing the treatment tank with a large number of hollow fiber membranes in a freely movable manner and circulating the mixed liquid in the treatment tank through a fixed pipe and a movable pipe moving up and down corresponding to the fluctuation of a water level. CONSTITUTION:A hollow fiber membrane module 2 is opened at the upper and lower end parts thereof to allow a mixed liquid to freely flow down and 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 to make it possible to allow the mixed liquid to flow in the fixed pipe 7. A buoyancy means 9 such as a float ring is mounted to the outer periphery of the upper part of the movable pipe 8 and the movable pipe 8 moves up and down with the rising or falling fluctuation of a water level WL. The mixed liquid in the pipes 7, 8 are circulated in the treatment tank 1 by a screw 10. By this method, the movable pipe is moved up and down corresponding to the fluctuation of the water level of the mixed liquid and, even when the water level is present at any position, the mixed liquid can be effectively circulated.