| 摘要 |
PURPOSE:To reduce the treating time and to decrease the frequency of washings by passing org. waste water through a filter bed, and further injecting an oxygen-contg. gas. CONSTITUTION:The waste water 8 is passed through a screen, etc., and then introduced into a tank filter 2. Most of the suspended solids(SS) and SS-based oxygen demand (OD) are collected by a fibrous filter medium packed in the filter bed 1, and removed. The effluent water 22 from the tank filter 2 is sent to a biological-membrane tank filter 4, and fine SS, which has not been removed in the tank filter 2, is collected. The BOD component is biologically oxidized and decomposed by the oxygen in the air supplied from an air diffuser 10 and the microbes living in the filter bed 3, and the waste water is purified. By this method, the working rate of the filter is increased. |
