Device for improving water purification efficiency of ultra-filtration membrane by performing pre-treatment of activating persulphate by ferrous ions and application method thereof

The invention relates to a device for improving the water purification efficiency of an ultra-filtration membrane by performing pre-treatment of activating persulphate by ferrous ions and an application method thereof, and aims to solve the problems that membrane pollution exists in ultra-filtration membrane operating, a trace organic substance removal effect is poor, and the ultra-filtration membrane pollution cannot be relieved effectively and pollutant removal cannot be reinforced in a conventional pre-treatment technology. The device consists of a raw water pipeline, a ferrous ion adding device, a persulphate adding device, an oxidative coagulation reaction tank, a sedimentation tank and an ultra-filtration membrane assembly. According to the device for improving the water purification efficiency of the ultra-filtration membrane by performing the pre-treatment of activating the persulphate by the ferrous ions and the application method thereof, a synergistic effect between the ferrous ions and the persulphate can be fully played; the ultra-filtration membrane pollution is relieved effectively, and meanwhile, the removal of micropollutant is reinforced.