Table 3 Overview of critical performance parameters for the bioreactor with pertraction (BP; pH 6) and the bioreactor without pertraction (BNP; pH 7) for the different operating phases as defined in Table 1 (average ± stdev)
From: Upgrading syngas fermentation effluent using Clostridium kluyveri in a continuous fermentation
Phase | OLR (g COD L−1 day−1) | OLR (mM-C day−1) | n-Butyric acid (mM day−1) | n-Caproic acid (mM day−1) | n-Caprylic acid (mM day−1) | Specificity C6 (%) | Specificity C8 (%) | Carbon conversion efficiency (%) | Extr. C6 (%) | Extr. C8 (%) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
BP | II–III | 7.0 ± 0.4 | 151.9 ± 31.4 | 0.9 ± 0.7 | 8.4 ± 8.4 | 0.2 ± 0.1 | 88.5 ± 10.1 | 3.7 ± 2.9 | 38.9 ± 17.4 | 80.4 ± 10.5 | 100.0 ± 0.0 |
IV | 10.9 ± 0.4 | 255.2 ± 7.4 | 1.3 ± 0.2 | 16.2 ± 5.4 | 0.6 ± 0.4 | 90.9 ± 2.0 | 3.9 ± 2.2 | 41.9 ± 2.5 | 64.8 ± 13.7 | 94.4 ± 6.6 | |
V | 14.2 ± 1.0 | 298.3 ± 9.6 | 1.7 ± 0.4 | 19.1 ± 6.6 | 1.0 ± 0.4 | 87.7 ± 3.9 | 6.4 ± 3.0 | 38.5 ± 12.6 | 37.8 ± 27.2 | 65.0 ± 26.5 | |
VI | 16.3 ± 0.4 | 370.0 ± 9.7 | 9.4 ± 0.7 | 39.9 ± 0.9 | 1.4 ± 0.2 | 83.0 ± 1.0 | 4.0 ± 0.4 | 79.9 ± 2.0 | 42.7 ± 6.9 | 77.0 ± 4.5 | |
VII | 10.7 ± 3.3 | 244.6 ± 74.4 | 7.8 ± 0.11 | 23.1 ± 4.7 | 0.47 ± 0.3 | 79.5 ± 1.9 | 1.9 ± 1.6 | 76.4 ± 19.5 | 70.0 ± 40 | 101 ± 2.7 | |
BNP | II | 6.9 ± 0.2 | 122.5 ± 31.7 | 1.0 ± 0.3 | 11.1 ± 2.7 | 0.8 ± 0.2 | 86.5 ± 0.5 | 8.1 ± 0.2 | 65.9 ± 17.4 | ||
III–IV | 10.9 ± 0.4 | 233.0 ± 7.9 | 1.7 ± 0.3 | 15.7 ± 0.5 | 1.2 ± 0.1 | 85.5 ± 1.2 | 8.5 ± 0.4 | 47.5 ± 2.5 | |||
V | 11.3 ± 1.2 | 241.0 ± 28.4 | 1.5 ± 0.2 | 18.6 ± 2.9 | 1.8 ± 0.3 | 84.7 ± 1.5 | 10.8 ± 1.2 | 54.7 ± 6.5 | |||
VI | 13.0 ± 0.03 | 296.5 ± 0.7 | 7.8 ± 0.7 | 37.6 ± 1.6 | 2.6 ± 0.01 | 81.4 ± 0.5 | 7.4 ± 0.3 | 93.6 ± 4.4 | |||
VII | 12.3 ± 1.2 | 279.7 ± 27 | 5.7 ± 0.7 | 35.3 ± 2.7 | 2.14 ± 0.4 | 84.2 ± 1.0 | 6.7 ± 0.7 | 90.1 ± 0.7 |