Table 2 Description of samples collected and important WWTP parameters
Date | 2015/8/15 | 2015/8/17 | 2015/8/18 | ||||||
Temperature (°C) | 28 | 32 | 32 | 32 | 32 | ||||
WWTP name | Qige WWTP | Shangyu WWTP | Shaoxing WWTP I | Shaoxing WWTP-II | Shaoxing WWTP-III | ||||
Sampling site | Anaerobic tank | Anoxic tank | Aeration tank | Anaerobic tank | Aeration tank | Anaerobic tank | Aeration tank | Oxidation ditch | Oxidation ditch |
Code | QG-Ana | QG-Ano | QG-O | SY-A | SY-O | SX-1-A | SX-I-O | SX-II (OD) | SX-III (OD) |
Valid tank volume (m3) | 5792 | 22,010 | 43,443 | 9640 | 36,730 | 44,640 | 216,691 | 818,670 | 302,000 |
Hydraulic retention time (h) | 1 | 3.8 | 7.5 | 4.11 | 15.67 | 8.5 | 15 | 43.6 | 40.3 |
Sludge retention time (days) | 15–18 | 6–14 | 15–22 | 10–17 | |||||
pH value on sample | 7.5 | 7.4 | 7.21 | 8.18 | 7.92 | 7.49 | 7.62 | 7.3 | 7.9 |