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Table 1 Average organic loading rates (OLR) and SRTs at different periods and the corresponding biodegradability for both mesophilic and thermophilic conditions

From: Microbial population dynamics during long-term sludge adaptation of thermophilic and mesophilic sequencing batch digesters treating sewage fine sieved fraction at varying organic loading rates

Conditions and operational days OLR, kg COD/(m3∙day) Applied SRT (day) Required SRT (day) AnBD (%)
Mesophilic
 333–393 5.5 60 64 ND
 393–550 2.5 157 128 53
 550–608 3.4 58 107 54
 608–624 6.7 16 53 45
 624–644 10.0 20 36 45
 644–650 13.5 6 27 44
 650–656 22.0 6 16 14
Thermophilic
 333–550 5.5 217 64 60
 550–608 6.7 58 53 57
 608–624 10.0 16 36 58
 624–644 13.5 20 27 47
 644–656 22.0 12 16 34
  1. ND not detected