| 摘要 |
<p>PURPOSE:To accomplish effective treatment of sewage or the like by maintaining appropriate ratio of inflow of substrate to amount of microorganism (F/M ratio) through control of excessive sludge with quick and accurate (quantitative) detection of changes in the inflow load. CONSTITUTION:A suspended mixture densitometer 7 and a dissolved oxygen densitometer 5 are provided in an aeration tank 2 to measure the concentration of activated sludge along with an air consumption gauge 7b for measuring the amount of aerated air fed to a blower 3. A sludge return pipe 8 between a final sedimentation pond 4 and an aeration tank 3 is provided with a return sludge densitometer 9 and a return sludge flowmeter 10 while a excessive sludge pipe 11 between a final sedimentation pond 4 and an initial sedimentation pond 1 with an excessive sludge flowmeter 12. CPU 14 computes the results of the measurement from the afore- mentioned measuring devices 5, 7, 7b, 9, 10 and 12 whose output controls the drive section 7a of an air pressure feeder B and an excessive sludge pump 13.</p> |
