| 摘要 |
<p>PURPOSE:To simultaneously perform denitrification treatment with aerobic treatment by providing an agitator to the inner circumferential side of an aqueduct slow in flow velocity and supplying the amount of necessary oxygen by an aerator provided to the outer circumferential side of the aqueduct by intermittent operation while always securing the necessary water flow. CONSTITUTION:An aerator 2 is arranged at the outer circumferential side of a terminalless aqueduct 13 and provided in the tangential direction to the aqueduct. An agitator 3 is arranged at the inner circumferential side of the aqueduct 13 and also a fitting angle for the aqueduct is regulated in the tangential direction of the aqueduct. In order to prevent sludge from being deposited on the bottom part of the aqueduct and to prevent deterioration of water quality, the agitator 3 is continuously operated so that the necessary flow velocity is always obtained in the aqueduct. The aerator 2 is intermittently operated. When operating this aerator, necessary water flow is generated in the aqueduct by the cooperative action of the agitator. While sewage is agitated, aeration is performed and aerobic fermentation treatment of sewage is performed. Water flow due to the agitator is generated in the aqueduct by stopping operation of an aerator but sewage is not aerated. Therefore denitrification of sewage is performed at the time the aeration is suspended.</p> |
