| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a septic tank incorporated an airlift pump capable of maintaining stable pumping up and a stable circulation water quantity for a long period. SOLUTION: In the septic tank 1 arranged from the upstream side in order of an anaerobic filter bed tank, an aerobic filter bed tank, a precipitation tank 9 or a treating water tank 12 and a sterilized tank 10 partitioned the tank inside with partitioning walls, a transferring device for circulating the tank water in the anaerobic filter bed tank, the precipitation tank 9 or the treated water tank 12 to the anaerobic filter bed tank is on an airlift pump system, and a movable body 24 for automatically washing the vertical pipe inside is provided in the vertical pipe of the airlift pump 13 and also the circulation water 18 lifted with the airlift pump 13 is transferred to the anaerobic filter bed tank.</p> |
