FLOW RATE ADJUSTING TANK, ANAEROBIC TREATMENT TANK AND SEWAGE CLEANING TANK

PROBLEM TO BE SOLVED: To provide a compact sewage cleaning tank further enhanced in capacity than before and capable of stably treating sewage. SOLUTION: A flow rate adjusting tank is divided into an upper effective part and a lower effective part by the horizontal surface of a water level half the maximum water level to be formed into a top-heavy shape wherein the volume of the lower effective part is 10-90% that of the upper effective part and the shape of an anaerobic treatment tank is bisected in the same way to be formed into each a fan shape wherein the volume of an upper effective part is 20-90% of the volume of a lower effective part, and these two tanks are provided side by side, and further, an aerobic treatment tank and a disinfection tank are provided to form the sewage cleaning tank.