Study on key influencing factors of magnetic autotrophic denitrification reactor

Abstract

Under the condition of inoculating autotrophic denitrification sludge cultured earlier in the laboratory by constructing a magnetic autotrophic nitrogen removal reactor, the effect of the change in the range of Influent ammonia nitrogen loading at 0.05KgN·m-3 d-1-0.2KgN·m-3 d-1, pH = 6 ~ 8, COD concentration in 0-300mg/L on the treatment efficiency of autotrophic nitrogen removal process was investigated. Research shows that, magnetic autotrophic denitrification reactor has better resistance to ammonia-nitrogen shock load. When the influent ammonia nitrogen concentration was 400mg / L (ammonia nitrogen loading was 0.2 KgN·m-3 d-1, the autotrophic nitrogen removal efficiency could be ensured. PH had obvious effects on short-cut nitrification and anaerobic ammonia oxidation in magnetic autotrophic denitrification reactor. Too high or too low pH had great effect on nitrogen removal efficiency of the reactor. At pH=8, the removal efficiency of total nitrogen is up to 60%, and the efficiency of autotrophic nitrogen removal is the best. The presence of appropriate organic carbon source is helpful to improve the efficiency of nitrogen removal. When the influent COD concentration is 100mg/L, the nitrogen removal efficiency of the reactor is the highest, and the removal rate of total nitrogen is 74%.