| 摘要 |
<p>PURPOSE:To detect the clogging of a diffuser in an installed state by dipping a bubbler pipe into an aeration tank to almost the same depth as the diffuser, and measuring the differential pressure between the air supply lines for the bubbler pipe and diffuser and the air flow rate of the air diffuser. CONSTITUTION:Compressed air is supplied to the diffuser 2 from a blower 3 through an air supply line 4 to carry out aeration, and a small amt. of air is simultaneously ejected from the tip of the bubbler pipe 5 through a line 6 into water. The differential pressure at this time between both air supply lines 4 and 6 is detected by a differential pressure transmitter 7. Since the flow rate of the air to be sent to the diffuser 2 changes sharply, the value measured by an air flowmeter 8 and the differential pressure are inputted to a computing element 9. The obtained air flow rate is expressed in terms of a value at a reference air flow rate, the discharge resistance to the air ejected from the diffuser 2, namely the variations in the differential pressure, is measured, and the clogging degree of the diffuser 2 can be obtained with the lapse of time.</p> |
