COMPRESSED-AIR DRYING SYSTEM

A compressed-air drying system is provided with: an air dryer (12) having a drying agent and a drain discharge port via which drainage liquid generated by regeneration of the drying agent is discharged; an oil mist separator (11) having a drain discharge port via which effluent containing captured oil is discharged, the separator being provided in the flow path between a compressor (15) and the air dryer (12); and an oil separator (40) for storing the effluent discharged from the air dryer (12) and the effluent discharged from the oil mist separator (11).