集成式铁基质生物膜反应器自养反硝化深度脱氮

Taking wastewater treatment plant as the research object, the iron matrix biological carrier and biofilm were used to achieve efficient autotrophic denitrification. The effect of HRT on autotrophic denitrification was studied. The mechanism of denitrification was revealed through the analysis of the dynamics and microbial community structure. The results showed when HRT was 8 h, for the tail water of primary A and primary B, the average removal rate of total nitrogen (TN) were 95.41% and 92.55%, and TN loads were 0.48 kg TN/(m³•d) and 0.58 kg TN/(m³•d), which reached the standard of "The Environmental Quality Standard of Surface Water". The saturation constants of NH₄⁺-N in nitrification process were 1.17 mg/L and 0.72 mg/L and the saturation constants of NO_3^--N in denitrification process were 0.87 mg/L and 0.67 mg/L, respectively. In the system, the dominant microorganisms were Maritimimonas, Rhodobacter and Sphaerotilus. They are autotrophic denitrification bacteria, which confirmed that the iron matrix biological carrier can provide electron for autotrophic denitrification bacteria, achieving autotrophic denitrification.