Influencing factors of denitrification of glycans and transformation characteristics of internal carbon sources

The denitrifying glycan bacteria were successfully enriched in the SBR reactor with sodium acetate as the carbon source and NO3--N as the electron acceptor, and the effects of the influent C/N ratio (3.3,6.7,10), electron acceptors (NO3--N, NO2--N), carbon source types (sodium acetate, glucose) on the activity of denitrifying glycans and the conversion characteristics of internal carbon sources were further investigated by batch experiment. The results show that the higher the influent C/N ratio, the higher the NOx--N removal rate of the system, and the more PHB synthesis in the anaerobic section, but the influent C/N ratio is too high, which leads to the predominance of common denitrifying bacteria. The denitrification efficiency of the internal carbon source is suitable for the influent C/N ratio of 6.7. The DGAOs system with NO3--N as the electron acceptor for long-term cultivation is not domesticated by NO2--N, and has good anti-NO2--N. Nitrification performance, after adding the same concentration of NO2--N as NO3--N, the system NOx--N removal rate is 89.6%; when glucose is used as the carbon source, the amount of PHB synthesized by DPAOs in the anaerobic section is only 79.5% of PHB with sodium acetate as the carbon source, and the anaerobic glucose utilization rate is only 72.8%, which is much smaller than the utilization rate of sodium acetate. © All Right Reserved.