| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable drawing sludge from a filter tank without deterioration of reversal washability. <P>SOLUTION: When operating a sewage treatment device 1 equipped with an upstream side tank F, the filter tank E2, a first transfer mechanism H1 for transferring water to be treated to the filter tank E2, a reversal washdevice G for peeling off the sludge adhering to a filter carrier C2, and a second transfer mechanism H2 for transferring the sludge in the filter tank E2, operation of the reversal wash device G and operation of the second transfer mechanism H2 are started in a state of stopping the first transfer mechanism H1. When the water level of the filter tank E2 is lowered to a prescribed lower limit position WL, the water to be treated is supplied to the filter tank E2 so as to restore the water level to a prescribed upper limit position WH. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
