Backwash system for pyrite coupling device

The invention discloses a backwash system for a pyrite coupling device. The backwash system comprises a bioreactor, a gas inlet, a water inlet, a first water outlet, a second water outlet and a three-phase separator, wherein the bioreactor is internally provided with a filler layer; the gas inlet and the water inlet are formed below the filler layer; the first water outlet and the second water outlet are formed above the filler layer; the first water outlet is formed above the second water outlet; the three-phase separator comprises a liquid inlet, an exhaust hole, a liquid discharge hole anda solid outlet; the liquid inlet is connected with the first water outlet and the second water outlet; the solid outlet is connected with the filler layer of the bioreactor. By adopting the backwash system for the pyrite coupling device, water is discharged twice from the first water outlet and the second water outlet, a filler can be cleaned completely, and the water consumption can be reduced. 本发明公开了一种用于硫铁耦合装置的反冲洗系统，包括：