Table 1.
Characterization of nutrients in the streams of the microfiltration process.
| Food Waste 1 | Food Waste 2 | ||||||
|---|---|---|---|---|---|---|---|
| Compound | Unit | Influent 1 | Permeate 1 | Retentate 1 | Influent 2 | Permeate 2 | Retentate 2 |
| Lactic acid | g/L | 24.7 ± 0.9 | 21.5 ± 1.3 | 20.4 ± 0.6 | 37.8 ± 0.4 | 36.6 ± 0.5 | 36.0 ± 0.4 |
| Acetic acid | g/L | 10.1 ± 0.8 | 8.7 ± 0.6 | 8.3 ± 0.4 | 17.7 ± 0.2 | 16.8 ± 0.1 | 15.9 ± 0.1 |
| Propionic acid | g/L | 20.0 ± 1.2 | 17.2 ± 1.1 | 16.7 ± 0.6 | 14.1 ± 0.2 | 12.9 ± 0.2 | 12.2 ± 0.1 |
| Butyric acid | g/L | 4.4 ± 0.3 | 3.8 ± 0.3 | 2.8 ± 0.1 | 4.4 ± 0.1 | 4.1 ± 0.1 | 3.6 ± 0.1 |
| Iso-butyric acid | g/L | 0.4 ± 0.0 | 0.4 ± 0.0 | 0.4 ± 0.0 | 0.3 ± 0.0 | 0.3 ± 0.0 | 0.3 ± 0.0 |
| Iso-valeric acid | g/L | 0.7 ± 0.0 | 0.6 ± 0.0 | 0.7 ± 0.1 | 1.0 ± 0.1 | 0.9 ± 0.1 | 0.8 ± 0.0 |
| Valeric acid | g/L | 0.1 ± 0.0 | 0.1 ± 0.0 | 0.3 ± 0.0 | 0.1 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 |
| Total carboxylic acids | g/L | 60.2 ± 3.5 | 52.4 ± 3.4 | 49.7 ± 2.8 | 76.2 ± 0.5 | 71.6 ± 0.7 | 68.8 ± 0.4 |
| COD from acids | g/L | 82.5 ± 1.5 | 71.5 ± 1.7 | 71.1 ± 2.0 | 96.5 ± 1.0 | 84.8 ± 0.5 | 83.9 ± 0.5 |
| Total COD | g/L | 232.6 ± 1.5 | 108.5 ± 2.0 | 560.3 ± 7.3 | 108.5 ± 0.8 | 92.5 ± 1.0 | 149.8 ± 1.2 |
| Total N | g/L N | 4.6 ± 0.3 | 3.8 ± 0.1 | 6.7 ± 0.4 | 3.0 ± 0.2 | 2.5 ± 0.1 | 4.3 ± 0.3 |
| Total P | g/L P | 3.7 ± 0.1 | 0.8 ± 0.0 | 6.5 ± 0.1 | 2.8 ± 0.1 | 0.6 ± 0.0 | 4.8 ± 0.2 |