Fig. 2: Long-term performance in partial nitrification sequencing batch reactor (PN-SBR). | Communications Engineering

Fig. 2: Long-term performance in partial nitrification sequencing batch reactor (PN-SBR).

From: Pilot-scale partial nitrification and anaerobic ammonium oxidation system for nitrogen removal from municipal wastewater

Fig. 2

a Influent NH4+-N (Inf. NH4+-N, black solid squares), effluent NH4+-N (Eff. NH4+-N, black hollow squares), effluent NO2−-N (Eff. NO2−-N, pink hollow circles), effluent NO3−-N (Eff. NO3−-N, blue hollow triangles), NH4+-N removal efficiency of PN-SBR (Re-NH4+-N, gray columns). b Influent chemical oxygen demand (Inf. COD, red solid rhombus), effluent chemical oxygen demand (Eff. COD, red hollow rhombus), chemical oxygen demand removal efficiency of PN-SBR (Re-CODPN, olive-green columns). c Influent chemical oxygen demand to total inorganic nitrogen ratio of PN-SBR (Inf. COD/TIN, light blue pentagons), nitrite accumulation rate (NAR, light purple columns), and aeration duration (green lines). I, II, and III at the top of the figure represent phase I, phase II, and phase III in the long-term operation of the system, respectively.

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