Table 2 Effect of FNA on the phosphorus removal performance of O/A/O/EI and A/O/A/O reactorsa

From: An efficient process for wastewater treatment to mitigate free nitrous acid generation and its inhibition on biological phosphorus removal

Influent FNA (×10−3 mg HNO2-N/L) O/A/O/EI reactor A/O/A/O reactor
PHA-up/VFA (C-mol/C-mol) Gly-syn/VFA (mM-C/g VSS) Effluent SOP (mg/L) Idle SOP release (mg/L) Anaerobic SOP release (mg/L) Gly-de/VFA (C-mol/C-mol) PHA-up/VFA (C-mol/C-mol) Gly-syn (C-mol/g VSS) Effluent SOP (mg/L)
0 0.52 ± 0.03 0.51 ± 0.04 0.22 ± 0.03 6.89 ± 0.04 62 ± 0.7 0.62 ± 0.04 1.19 ± 0.02 1.87 ± 0.09 0.75 ± 0.05
0.05 0.48 ± 0.05 0.49 ± 0.05 0.39 ± 0.05 6.22 ± 0.06 58 ± 1.2 0.61 ± 0.03 1.06 ± 0.05 1.72 ± 0.05 1.04 ± 0.07
0.15 0.42 ± 0.02 0.47 ± 0.08 1.15 ± 0.07 5.79 ± 0.03 53 ± 0.9 0.59 ± 0.05 1.01 ± 0.04 1.59 ± 0.07 3.85 ± 0.09
0.26 0.38 ± 0.05 0.41 ± 0.04 1.55 ± 0.11 5.42 ± 0.06 49 ± 0.8 0.55 ± 0.02 0.92 ± 0.06 1.36 ± 0.04 4.05 ± 0.11
0.38 0.35 ± 0.06 0.40 ± 0.02 2.36 ± 0.05 5.18 ± 0.02 43 ± 1.4 0.54 ± 0.03 0.79 ± 0.07 1.24 ± 0.06 5.12 ± 0.12
0.51 0.31 ± 0.03 0.38 ± 0.03 5.10 ± 0.08 4.87 ± 0.05 35 ± 0.5 0.53 ± 0.04 0.71 ± 0.05 1.12 ± 0.07 7.05 ± 0.09
  1. aResults are the average and standard deviation and the data were obtained during the steady-state operation.