Table 1.
Experimental conditions in the PHA (Polyhydroxyalkanoates) fed-batch accumulations.
| Experiment set | Substrate Composition and Feeding Strategy (gCOD Basis) | Experiment Label | Process Time (h) | Initial VSS (g·L−1) | Total substrate added (gCOD) | Feed Concentration (gCOD·L−1) | Total Number of Pulses | ||
|---|---|---|---|---|---|---|---|---|---|
| HAc | HPr | HAc | HPr | ||||||
| 1 | 100% Acetic acid | Exp 1 | 23.2 | 1.2 | 1374 | - | 96 | 138 | - |
| Exp 1′ | 21.9 | 1.4 | 1684 | - | 98 | 147 | - | ||
| 2 | 100% Propionic acid | Exp 2 | 23.3 | 1.2 | - | 939 | 106 | - | 77 |
| Exp 2′ | 24.6 | 1.7 | - | 1439 | 102 | - | 137 | ||
| 3 | 50% Acetic/50% propionic acid | Exp 3 | 24.2 | 1.5 | 600 | 600 | 98 | 95 | |
| Exp 3′ | 20.4 | 1.9 | 817 | 817 | 98 | 140 | |||
| 4 | 100% Acetic acid—100% propionic acid (alternating) | Exp 4 | 22.3 | 1.4 | 1429 | 982 | 101/103 | 106 | 105 |
| Exp 4′ | 22.5 | 1.7 | 570 | 552 | 94/97 | 57 | 56 | ||