COD-RE at each HRT. CODIN and CODEF represent the CODs in the influent and effluent, respectively. The average values and standard deviations are shown for samples taken at different times (n = 4), indicated by arrows in Fig. 2. * denotes a significant difference (p < 0.05) in the statistical test, which was conducted using an unpaired two-tailed Welch's t-test.
| HRT [h] | CODIN [mg L−1] | CODEF [mg L−1] | COD-RE [%] | ||
|---|---|---|---|---|---|
| MFC | NON | MFC | NON | ||
| 3 | 150 ± 11 | 110 ± 10 | 110 ± 11 | 28 ± 3.6 | 29 ± 5.4 |
| 6 | 210 ± 13 | 150 ± 6.3 | 160 ± 13 | 30 ± 4.2 | 21 ± 10 |
| 12 | 180 ± 21 | 99 ± 21 | 130 ± 8.9 | 46 ± 6.4* | 31 ± 4.0 |
| 18 | 180 ± 30 | 73 ± 6.4 | 100 ± 12 | 59 ± 3.9* | 43 ± 4.0 |