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Table 1 Summary of the overall operating dada of the waste water treatment plants

From: Nitrite oxidizing bacteria (NOB) dominating in nitrifying community in full-scale biological nutrient removal wastewater treatment plants

Plant Process Operational parameters Influent Effluent
Flow rate (104m3/d) Tem (°C) SRT (d) HRT (h) SS (mg/L) VSS (mg/L) SV30 Sludge recycle ratio pH in aeration basin COD (mg/L) TN (mg/L) NH4 +-N (mg/L) COD (mg/L) TN (mg/L) NH4 +-N (mg/L)
W1 A2O 14.5 23 10 11–12 3600 2500 26 90 7.5 500–600 58 45 30 13 ≤1
W2 MAO 14.5 23 10 11–12 4000 2800 50 100 7.5 500–600 58 45 30 13 3
W3 Oxidation ditch 15 23.2 16 12 6000 4080 88 95 7.2 368 43.29 35.14 21 4.36 0.68
W4 MAO 15 25 15 12 5800 3900 90 95 7.2 208 46.75 39.12 23.67 16.95 11.56
W5 Oxidation ditch 15 24.2 17–19 21 5700 3000 88 100 7.7 301 39 27.57 22 7.06 0.363
W6 A2O 25 23.1 23 12.5 4000 2500 70 100 7.6 620 47.88 30.71 18 12.66 0.18
W7 A2O 20 24.17 19 15 7000 4500 88 80–85 7.6 442.71 43.7 32.27 17.9 7.68 ≤1
W8 A2O 10 25 10 16 5800 3000 87 80 7.5 700 48 25–30 22 8 0.1
W9 Oxidation ditch 6.8 20 17 18 4800 2400 50 80 7.5 550 48 40 22 10 0.5–1
W10 Oxidation ditch 10 20 15 20 4500 2500 65 60 7.5 550 65 50 20 8 1