| 摘要 |
<p>PURPOSE:To increase the counteraction force against a fluctuation in load and to improve the stability of treated water quality by measuring the overflow water depth of a movable weir by regarding the same as the water level in a ditch tank and controlling the revolving speed of an aeration rotor by the water level signal of this time. CONSTITUTION:An outflow path 6 in which the treated water overflows is provided in the circulation path 2 of the ditch tank 1 for aerating sewage by the revolving type rotor 3 and a liquid level gage 8 which detects the overflow water depth h1 is installed. The water level signal from this level gage 8 is fed to a revolution controller 9 which receives the signal and controls the revolv ing speed of the aeration rotor 3 is accordance with the water level in the tank 1. The necessary oxygen supply is executed in this way by the revolution of the rotor 3 according to the volume of the sewage (load).</p> |
