SUPPORT SEPARATION SCREEN APPARATUS, METHOD OF AERATION OF SUPPORT SEPARATION SCREEN, AERATION APPARATUS FOR THE METHOD, WASTE LIQUID PROCESSING METHOD AND APPARATUS USING THE SCREEN APPARATUS AND AERATION APPARATUS

摘要

A support separation screen apparatus is used for separating a bacteria fixation support (5) used in an aeration tank (1) for biologically purifying organic and inorganic matters in a waste liquid. A flow straightening body (20) is disposed in the proximity of a support separation screen (7) in a spaced relation and an aeration device (8) is disposed below and in the proximity of the support separation screen in order to reliably prevent clogging of the screen. A method and an apparatus for support separation screen is provided for preventing clogging of the screen by providing an air-diffusing header for air-diffusion at a time-varying diffusion rate and an air-diffusion rate controller for changing the air-diffusion rate with time. Further, a waste liquid processing method and an apparatus is provided for preventing clogging of a screen and allowing the function of a bacteria fixation support to be fully performed by producing a circulation in a tank and by dispersing uniformly a flow into a support separation screen.