| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently treat sewage even when sewage inflow volume exceeds planned maximum inflow volume. <P>SOLUTION: In a sewage treatment method, when the sewage inflow volume exceeds the planned maximum inflow volume, activated sludge mixed liquid in a biological reaction vessel 1 is supplied to an activated sludge concentration device 3 by adjusting the opening degree of an opening/closing valve B arranged in a flow channel L5 by means of a control device 4 to reduce the water levels of the activated sludge mixed liquid in the biological reaction vessel 1 and a final settling basin 2 to predetermined values or less. Consequently even when the sewage inflow volume exceeds the planned maximum inflow volume, sewage can be efficiently treated. <P>COPYRIGHT: (C)2013,JPO&INPIT |
