Table 1 Summary of the overall operating dada of the waste water 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 |