The response rule of wetland microorganisms by coupling of partial nitrification process and constructed wetland

Abstract

In this study, the response rule of wetland microorganisms by coupling of partial nitrification (PN) process and vertical flow constructed wetland (VFCW) were determined. Coupling of PN effluent and exhaust gas positively affected microbial abundance and community. Results revealed that the microbial community structure in the VFCW was changed. The nitrification and denitrification intensities were promoted and the abundance of functional bacteria related to nitrogen and organic matter removal were increased. In addition, the removal efficiencies of pollutants of VFCW have been significantly improved. The results showed that the System II coupling the PN effluent and intermittent aeration with exhaust gas achieved better removal of NH4+-N (92.61 ± 2.25 %) and TN (70.33 ± 3.61 %) than the System I that only fed PN effluent without exhaust aeration. NO2−-N pollution in PN effluent was eliminated with a removal efficiency of 97.58 ± 1.08 %.