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Table 1 Operational parameters and process performance

From: Comparison of the bacterial community composition in the granular and the suspended phase of sequencing batch reactors

Parameter Unit R1 R2 R3
t H 4 4 4
OLR kg COD/m3/day 3.71 ± 0.04 1.87 ± 0.04 0.91 ± 0.04
NLR kg NH4–N/m3/day 0.22 ± 0.02 0.22 ± 0.02 0.22 ± 0.02
COD:N ratio 100:6 100:12 100:24
Influent COD mg/L 1416 ± 14 712 ± 14 346 ± 14
Influent NH4–N mg/L 85 ± 6 85 ± 6 85 ± 6
ECOD % 98.3 ± 1.1 96.0 ± 1.4 86.3 ± 0.6
ENH4 % 100 100 100
ETN % 65.5 ± 7.2 38.1 ± 16.4 0.4 ± 19.0
Effluent SS mg/L 301 ± 98 133 ± 28 74 ± 13
  1. Cycle length (t); organic and nitrogen loading rate (OLR, NLR); COD:N ratio; influent COD and NH4–N concentration; removal efficiency (E) of COD, NH4 and TN during the last 4 weeks; average effluent suspended solids concentration (SS)