Novel combined defluorinating device for underground water

The invention provides a novel combined defluorinating device for underground water. The device comprises a water inlet unit, a defluorinating reaction unit, a pipe chute or cantboard separating area, an initial filter unit, a terminal filter unit, a backwashing device and an electromagnetic exhausting valve which are sequentially arranged from bottom to top, wherein the terminal filter unit comprises a central water inlet pipe as well as a stainless steel filter screen and a closed quartz sand filter layer sequentially arranged from bottom to top, the central water inlet pipe is arranged on the top of the initial filter unit at the bottom and penetrates through the middle parts of the stainless steel filter screen and the quartz sand filter layer, and the lower part of the central water inlet pipe between the stainless steel filter screen and the quartz sand filter layer is stainless steel filter cloth with the aperture of 0-0 mu m; a water collecting area is arranged at the bottom of the quartz sand filter layer, and water outlet pipes which are communicated with each other are arranged on the top of the stainless steel screen and the side wall of the water collecting area. The novel defluorinating device provided by the invention has the advantages of compact structure, small occupied area, low treatment cost, high effluent quality and the like, is convenient to change and flexible to use, and has a good popularization and application prospect.