TABLE 2.
Effect of aggregate size on the self-diffusion coefficient, T2 and D/Daq of different methanogenic aggregates sampled from mesophilic full-scale anaerobic UASB bioreactors and a thermophilic laboratory-scale reactor
| Wastewater type and size fraction (diam [mm]) | Da (10−9 m2/s) | T2 (ms) | D/Daq (%) |
|---|---|---|---|
| Pulp and paper (Eerbeek) | |||
| 0.5-1.0 | 1.36 ± 0.02 | 49.3 | 63 |
| 1.0-1.4 | 1.22 ± 0.03 | 46.3 | 56 |
| >1.4 | 1.39 ± 0.01 | 42.0 | 64 |
| Brewery I (Heineken) | |||
| 0.5-1.0 | 1.20 ± 0.02 | 49.3 | 67 |
| 1.0-1.4 | 1.16 ± 0.01 | 46.3 | 68 |
| 1.4-2.0 | 1.16 ± 0.03 | 30.0 | 65 |
| >2.0 | 1.27 ± 0.01 | 46.8 | 74 |
| Brewery II (Grolsh) | |||
| 0.5-1.0 | 1.31 ± 0.03 | 50.4 | 77 |
| 1.0-1.4 | 1.34 ± 0.02 | 44.7 | 77 |
| >1.4 | 1.26 ± 0.03 | 28.9 | 76 |
| Food (Cargill) | |||
| 1.0-1.4 | 1.32 ± 0.01 | 49.3 | 69 |
| 1.4-2.0 | 1.29 ± 0.03 | 45.7 | 78 |
| >2.0 | 1.29 ± 0.03 | 47.1 | 78 |
| Citric acid (Ringaskiddy), all fractions | 1.32 ± 0.02 | 45.3 | 61 |
| Thermophilic oleate-degrading aggregates, all fractions | 1.68 ± 0.03 | 25.7 | 86 |
a
Values are means ± standard deviations from triplicate experiments.