| 摘要 |
<p>PURPOSE:To reduce the cost of driving power by dividing air diffusing pipes for feeding air to an aeration tank to plural air diffusing pipe groups of with which the flow rates are adjustable, providing devices for measuring the rate of utilizing oxygen to the respective air diffusing pipe groups and providing an arithmetic part to the device. CONSTITUTION:Sewage flows through a pipeline A into the aeration tank 1 and is mixed with the return sludge returned from a settling basin B through a pipeline C. Air for aeration is fed from the plural air diffusing pipe groups 2 via respective flow rate control valves 3 to the tank 1 and the air flow rate over the entire part is controlled by a blower 4 and a flow rate control valve 5. A water temp. measuring device 6 and sample selector valves 7 which can make sampling with each of the air diffusing pipes and a sampling pump 8 are provided to the tank 1. The rate of utilizing oxygen is measured by each number of the air diffusing pipes.</p> |
