| 摘要 |
<p>PURPOSE:To efficiently treat raw water by propagating microorganisms having a different time of alternation of generation for an appropriate time and activating the microorganisms. CONSTITUTION:This device is provided with a first biological activated carbon bed 3 in which the microorganisms having a relatively short generation alternation time is propagated and a second biological activated-carbon bed 4 in which the microorganisms having a relatively long generation alternation time is propagated. The first bed 3 is furnished with the air feed pipe 6 and backwashing pipe 8 for backwashing the bed at short time intervals, and the second bed 4 is provided with the air feed pipe 7 and backwashing pipe 9 for backwashing the bed at long time intervals.</p> |
