OPERATION METHOD FOR AEROBIC TREATMENT TANK AND SEWAGE SEPTIC TANK

摘要

PROBLEM TO BE SOLVED: To provide an operation method for a sewage septic tank (or an aerobic treatment tank) having high inflow load and capable of efficiently cleaning a lower section even SS converted from an organic matter is generated in large quantity. SOLUTION: A sewage septic tank 1 is provided with an aerobic treatment tank 4 which is arranged so as to adjoin to an anaerobic treatment tank 2 vertically or linearly (apposition) from upper stream, in which a diffusing member 13 for reaction is arranged in the lower part or the downward of a biological reaction bed 22 and a diffusing member 14 for cleaning is arranged in the lower part or the downward of a filtration bed 23, a treatment water tank 5, and a sterilization tank 6. When the sewage septic tank 1 is operated, diffusing air is not conducted from the diffusing member 14 for cleaning but basically conducted from the diffusing member 13 for reaction, and sewage treatment (normal operation) is conducted. During the operation, diffusing air is conducted from the diffusing member 14 for cleaning for a predetermined time, and a cleaning operation for the filtration bed for draining the cleaned waste water is conducted several times a day.