In this paper,five kinds of sulfur autotrophic filter media to municipal sewage secondary sedimentation tank effluent nitrate removal effect,for the subsequent optimization of sewage treatment process to provide theoretical support.The experimental results show that the removal efficiency of nitrate by five sulfur autotrophic filter media is different when the filter media is filled at 1.0 m height and the filter velocity is different(2 m/h～8 m/h).Among them,A and B have the best removal efficiency,the removal rate of nitrate is up to 90%,which is mainly due to the low strength of these two filter media,sulfur release rate caused by large.The nitrate removal rate of the other three filter media ranged from 20%to 80%,showing a trend of first increasing and then decreasing with the increase of the filtration rate of the empty tower.In general,sulfur autotrophic filter can be used to replace quartz sand filter media in the retrofit of existing V-type filter and denitrification filter to meet the increasingly stringent requirements of total nitrogen emission.
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