Table 1. Observed variables and calculated kinetic parameters of cycle measurements and short-term temperature change experiment.
| SBR (#) | Cycle length (h) | Temperature (°C) | Length feasta (min) | Length feastb (%) | PHBfeast%c (wt%) | PHBend%d (wt%) | qSmaxe (Cmmol Cmmol−1 h−1) | YPHB,Sfeast (Cmmol Cmmol−1) | k-valuef ((Cmmol Cmmol−1)1/3 h−1) | Bacteria |
|---|---|---|---|---|---|---|---|---|---|---|
| SBR1 | 4 | 20 | 31 (2.83) | 12.9 (1.18) | 17.7 (0.42) | 2.4 (0.57) | −0.96 (0.32) | 0.59 (0.01) | −0.26 (0.04) | Zoogloea sp. |
| SBR2 | 12 | 20 | 119 (2.12) | 16.5 (0.29) | 51.3 (0.64) | 4.1 (2.76) | −1.28 (0.16) | 0.60 (0.06) | −0.18 (0.06) | Zoogloea sp. |
| SBR2g | 12 | 30 | 86 (N/A) | 11.9 (N/A) | 46.8 (N/A) | 1.2 (N/A) | −1.54 (N/A) | 0.60 (N/A) | −0.43 (N/A) | Zoogloea sp. |
| SBR3 | 1 | 30 | 3 (0.00) | 5.0 (0.00) | 6.6 (1.41) | 1.5 (0.49) | −2.52 (0.23) | 0.61 (0.00) | −0.56 (0.01) | P. acidivorans |
| SBR4 | 4 | 30 | 10 (2.83) | 4.2 (1.18) | 21.5 (1.48) | 4.7 (1.70) | −3.25 (0.35) | 0.62 (0.01) | −0.26 (0.01) | P. acidivorans |
| SBR5 | 12 | 30 | 33 (2.00) | 4.7 (0.29) | 53.1 (0.07) | 2.8 (2.26) | −4.07 (0.21) | 0.66 (0.03) | −0.17 (0.01) | P. acidivorans |
| SBR5g | 12 | 20 | 73 (N/A) | 10.1 (N/A) | 56.3 (N/A) | 41.5 (N/A) | −2.00 (N/A) | 0.66 (N/A) | −0.04 (N/A) | P. acidivorans |
| SBR6 | 18 | 30 | 137 (N/A) | 12.7 (N/A) | 71.3 (N/A) | 4.7 (N/A) | −2.40 (N/A) | 0.64 (N/A) | −0.13 (N/A) | P. acidivorans |
Abbreviations: N/A, not available; PHB, polyhydroxybutyrate; SBR, sequencing batch reactor.
a
Absolute length of the feast phase during one cycle measurement.
b
Relative length of the feast phase over total cycle length.
c
The PHB content at the end of the feast phase.
d
The PHB content at the end of the famine phase.
e
The maximum biomass specific substrate uptake rate. ‘–' indicates the consumption of substrate.
f
Rate constant of PHB degradation. It was used to estimate the PHB degradation rate during the famine phase. ‘–' indicates the consumption of PHB.
g
The short-term temperature change experiment.
The s.ds. are given in the brackets. Within the experiments, without repeating, the s.ds. are marked as not available (N/A).