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Table 2 Description of samples collected and important WWTP parameters

From: Activated sludge bacterial communities of typical wastewater treatment plants: distinct genera identification and metabolic potential differential analysis

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