Downward flow type sulfur autotrophic nitrogen removal filter tank

The utility model discloses a down-flow type sulfur autotrophic nitrogen removal filter tank which comprises a tank body, a drainage channel is arranged at the bottom in the tank body, a water distribution and gas distribution system, a supporting layer, a cushion layer and a sulfur filler are sequentially arranged above the drainage channel, an overflow weir is arranged above the sulfur filler, and a water inlet channel is defined by the overflow weir and the inner wall of one side of the tank body. And the top of the overflow weir is provided with a grating plate with aperture smaller than that of the sulfur filler. The down-flow type sulfur autotrophic nitrogen removal filter tank disclosed by the utility model can avoid loss of small-particle sulfur filler due to backwashing. 本实用新型公开了一种下流式硫自养脱氮滤池，包括池体，池体内底部设置排水渠，排水渠上方依次设置配水布气系统、承托层、垫层和硫填料，硫填料上方设置溢流堰，溢流堰与池体一侧内壁围成进水渠，溢流堰顶部设置孔径小于硫填料粒径的格栅板。本实用新型的下流式硫自养脱氮滤池可避免小颗粒硫填料因反洗流失。