AEROBIC FILTER-BED TANK PROVIDED WITH WATER-LEVEL SENSOR, SEPTIC TANK AND SEWAGE TREATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an aerobic filter-bed tank, septic tank or sewage treating method by which sewage is appropriately treated irrespective of the load or longitudinal level, and energy is saved.;SOLUTION: Sewage is aerobically treated by using the aerobic filter-bed tank C having two filter beds, i.e., a biological reaction bed 1 (upper filter bed) and a filter bed 2 (lower filter bed), while cleaning the filter bed 2 (lower filter bed) intermittently. In this case, the cleaning is started when a specified water level is detected by a water-level sensor 8 arranged in the tank or a fixed time (time lag) has passed after the detection.;COPYRIGHT: (C)2001,JPO