集成式铁基质生物膜反应器自养反硝化深度脱氮

以污水厂处理水为研究对象，采用铁基质生物载体与生物膜耦合实现高效自养反硝化脱氮。考察停留时间（HRT）对系统脱氮效能的影响，通过动力学及微生物群落结构分析，揭示耦合技术的脱氮机理。结果表明：HRT为8 h，对一级A和一级B污水厂处理水，总氮(TN)平均去除率分别为95.41%和92.55%，TN处理负荷分别为0.48 kg TN/(m³·d）和0.58 kg TN/(m³·d），硝化过程氨氮(NH₄⁺-N)饱和常数分别为1.17 mg/L和0.72 mg/L，反硝化过程硝氮(NO₃^--N)饱和常数分别为0.87 mg/L和0.67 mg/L。出水水质分别达到《地表水环境质量标准》Ⅲ类、Ⅴ类水质标准。铁基质生物载体与生物膜耦合系统中微生物优势菌属为Maritimimonas、Rhodobacter和Sphaerotilus, 均为自养反硝化菌，证实了铁基质生物载体可为自养反硝化菌提供电子，实现生物自养反硝化脱氮。

Advanced nitrogen removal of autotrophic denitrification by integrated iron substrate biofilm reactor

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 \mathrm{N}{\mathrm{O}}_{\mathrm{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.