| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an aerobic filter bed tank or satisfactorily maintaining the performance of waste water treatment by preventing SS from remaining on the bottom of this tank, and a method for cleaning a lower filter bed (filter layer) of the aerobic filter bed tank. SOLUTION: At the time of cleaning a filter layer 2 of an aerobic filter bed tank C in which a biological reaction layer 1 is formed as an upper filter bed and the filter layer 2 is formed as a lower filter bed, aeration from an air diffusing tube 4b arranged at he lower of the filter layer 2 is carried out, and also aeration from an air injecting tube 6 arranged at the lower part of the air diffusing tube 4b is carried out, and purified waste water is extracted from a purified water extraction port 5a through an air lift pump 5, and transferred to the upper part of an anaerobic filter bed tank first chamber A on the upstream of the aerobic filter bed tank C, and the transferred flowing water from an anaerobic filter bed tank second chamber B pushed out according to the transfer is introduced to the upper filter bed 1 of the aerobic filter be tank C.</p> |
