Study on the Start-Up of Sulfur Autotrphic Denitrification Bioreactor for the Simultaneous Removal of Nitrogen and Sulfur

The start-up of sulfur autotrphic denitrification process in anaerobic filter is conducted.This experiment choose the anaerobic biofilter for the biological reactor,the ordinary anaerobic digestion sludge as the inoculated sludge,containing a self-equipped S2--S,and NO-3-N as influent and the influent volumetric loading are 0.24 kg/(m3·d)and 0.105 kg/(m3·d).The start-up of sulfur autotrophic denitrification is researched through the 15 d intermittent operation and 15 d continuous operation.The S2--S and NO-3-N removal efficiency are basically stable at more than 90% and 80%,the volumetric removal loading are 0.238 kg/(m3·d)and 0.093 3 kg/(m3·d)respectively.The generation rate of sulfur and nitrite-nitrogen are about 75% and 64%.The reactor screen enriches sulfur autotrophic denitrification bacteria in a short time successfully,and achieve a high S2--S and NO-3-N removal volumetric loading rate.The result showes that start-up of sulfur autotrphic denitrification is successfully achieved.