| 内容提要: |
A lab-scale anammox biofilm reactor was run for 110 days with the operation temperature declining from 36 ℃ to 15 ℃. The total inorganic nitrogen removal efficiency showed a reduction from 80% to 66%, when the temperature declined from 36 ℃ to 15 ℃. This study observed that N-acyl-L-homoserine lactones (AHLs) concentrations, especially C8-HSL as well asC6-HSL, declined in water and also in biomass phases, and the result indicated that the microbial communication weakened. Microbial community analysis revealed that Candidatus Kuenenia wasthe predominant anammox bacteria during the whole operating period. The abundance of Candidatus Kuenenia increasedfrom 1.43% to 22.89%, with the temperature decreasing from 36 ℃ to 15 ℃. The correlation between microbial genus and AHLs was complicated. Overall, temperature decrease weakened the microbial communication so that the nitrogen removal performance deteriorated, and increasing the activity of anammox microorganisms might be an efficient way for performance improvement. |