TABLE 2.
Summary of the stoichiometric parametersa obtained for the different cycle studies performed
| Operation time (days) | Results for:
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Xi | La:Ac:Pr:Bu:Vab | 3HB:3H2MB:3HV: 3H2MV:3HHx | PHAmax (%) | VFAs | ΔNH4+ | Anaerobic phase
|
Aerobic phase
|
|||||
| YPHA/VFA | YPHA/(VFA+Glyc) | YGlyc/VFA | YGlyc/PHA | YX/PHA | ΔY | |||||||
| 81 | 3.6 | 0:44.8:33.1:14.2:7.8 | 25.3:0:74.2:0:0.5 | 14.9 | 11.3 | 0.23 | 2.28 | 0.94 | 1.43 | 0.48 | 0.21 | 0.69 |
| 137 | 5.1 | 9.1:66:8:14.3:2.6 | 38.4:0:59.9:0:1.7 | 17.4 | 20.9 | 1.59 | 2.11 | 0.87 | 1.43 | 0.45 | 0 | 0.45 |
| 198 | 3.6 | 2.8:72.7:5.9:15.6:2.9 | 31.8:10:46:7:5.3 | 15.8 | 15.8 | 0.01 | 2.50 | 0.99 | 1.53 | 0.71 | 0.09 | 0.81 |
| 266 | 3.7 | 1.3:75.6:7.1:13:3.1 | 26.7:6.1:39.5:4.6:23.1 | 13.2 | 11.6 | 0.24 | 2.53 | 0.94 | 1.70 | 0.74 | 0.02 | 0.77 |
| 304 | 4.2 | 0.9:70.3:5.9:21.4:1.5 | 29.5:6.7:30.2:4.8:28.9 | 20.0 | 18.5 | 0.77 | 2.78 | 0.98 | 1.84 | 0.42 | 0.14 | 0.56 |
| 365 | 4.8 | 1.4:65.5:8.4:23.1:1.5 | 25.5:5.6:33.4:4.7:30.8 | 20.8 | 18.6 | 1.31 | 2.89 | 0.90 | 2.21 | 0.50 | 0.03 | 0.53 |
a
Xi, initial specific biomass in g/liter; La:Ac:Pr:Bu:Va ratio in % mmol/mmol VFAs; 3HB:3H2MB:3HV:3H2MV:3HHx ratio in % mmol; PHAmax in mg PHA/mg TSS; VFAs in C-mmol/liter; ΔNH4+ in N-mmol/liter; YPHA/VFA and YPHA/(VFA+Glyc) in C-mol PHA/C-mol substrate; YGlyc/VFA in C-mol Glyc/C-mol VFA; YGlyc/PHA in C-mol Glyc/C-mol PHA; YX/PHA in C-mol X/C-mol PHA; aerobic ΔY in C-mol/C-mol.
b
Ac, acetate; Pr, propionate; Bu, butyrate; Va, valerate; La, lactate.