| 摘要 |
<p>PURPOSE:To obtain the purifying device for sewage of an intermittent aeration type for decreasing an equipment burden of an aeration device to half, while setting aeration to sewage in an aeration tank, executed by the aeration device provided in an aeration tank, to a form of aeration, in which an aeration process and a non-aeration process are repeated alternately. CONSTITUTION:Two or more aeration tanks 3 are installed in parallel, and in those aeration tanks 3, a diffusing tube 42 allowed to communicate through a feed air tube 41 with a discharge port of an air blower 40 for discharging pressure air of an aeration device 4 is distributed and provided at every aeration tank 3, and in a conduit line between the discharge port of the air blower 40 and the diffusing tube 42, control valve devices V1, V2 for controlling so that the diffusing tubes 42 distributed at every aeration tank 3 are switched alternately and allowed to communicate at every aeration tank 3 against the discharge port of the air blower 40.</p> |
