Combined treatment septic tank system using single treatment septic tank

摘要

PROBLEM TO BE SOLVED: To provide a new incorporation treating septic-tank system effectively utilizing an existing single treating septic tank without removing or disposing the existing single treating septic tank. SOLUTION: A small-sized incorporation treating septic tank 18 manufactured on the basis of a structural reference established by the Ministry of Construction is installed onto a frame 17 mounted on the ground, discharge pipes 23, 24, 25 with transparent pipes 23a, 24a, 25a for monitoring sediment sludge and on-off valves V1, V2, V3 are set up to the lower sections of each tank of the small-sized incorporation treating septic tank 18, and sediment sludge is discharged to an original contact areration chamber 2 for an existing single treating septic tank 16 through the discharge pipes. Sewage flowed into the existing single treating septic tank 16 is forwarded into the small-sized incorporating treating septic tank 18 through a dividing basin 21, and the overflowing sewage from the dividing basin 21 is returned into an original sediment separating chamber 1 for the single treating septic tank 16 while a liquid in the small- sized incorporation treating septic tank 18 is discharged to a final effluent channel for the single treating septic tank 16 or a new final effluent channel.