Table 3.
Parameters characterizing the MMC selection and PHA accumulation processes with the three OFMSW-supernatants
| Substrate | PHA contenta (g kg−1 VSS) | Polymer composition (ΔHB/ΔHV) (% w/w) | PHA yieldc (mg mg−1 CODcons.) | PHA yieldd (mg mg−1 CODOA-cons.) | PHA yielde (g kg−1 CODin) | PHA yieldf (g kg−1 OAin) | PHA productivity (g L−1 day−1) | X growth yieldg (mg mg−1 CODcons.) |
|---|---|---|---|---|---|---|---|---|
| Selection | ||||||||
| OFMSW-supernatantin 1 | 342 ± 23 | – | 0.51 ± 0.02 | 0.85 ± 0.26 | – | – | – | 0.16 ± 0.01 |
| OFMSW-supernatantin 2 | 383 ± 2 | – | 0.54 ± 0.07 | 0.87 ± 0.09 | – | – | – | 0.05 ± 0.01 |
| OFMSW-supernatantin 3 | 234 ± 20 | – | 0.42 ± 0.04 | 1.15 ± 0.34 | – | – | – | 0.09 ± 0.01 |
| Accumulation | ||||||||
| OFMSW-supernatantacc. 1 | 476 ± 41b | 56.5 ± 3.5/43.5 ± 3.5 | 0.44 ± 0.17 | 1.13 ± 0.18 | 134 ± 22 | 230 ± 38 | 4.4 ± 1.3 | – |
| OFMSW-supernatantacc. 2 | 465 ± 21b | 54.5 ± 2.6/45.5 ± 2.6 | 0.52 ± 0.1 | 0.75 ± 0.21 | 128 ± 16 | 220 ± 28 | 4.3 ± 1.2 | – |
| OFMSW-supernatantacc. 3 | 405 ± 28b | 57 ± 2/43 ± 2 | 0.5 ± 0.1 | 0.66 ± 0.09 | 94 ± 5 | 161 ± 9 | 7 ± 0.9 | – |
aPHA stored at the end of the feast phase referred to VSS
bPHA accumulated at the end of the accumulation test referred to VSS
cPHA storage yield expressed as COD (CODPHA) referred to CODcons.
dPHA storage yield expressed as COD (CODPHA) referred to CODOA-cons.
ePHA produced referred to CODin
fPHA produced referred to OAin
gX growth yield during feast phase expressed as COD (CODX) referred to CODcons.