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Biofilter media characteristics
| Characteristic | Fresh scoria | Compost |
|---|---|---|
| Particle size (mm) | 6-13 | 1-6 |
| Bulk density (kg m−3) | 444 | 325 |
| Initial moisture (%) | <2 | 26.5 |
| Water holding capacity (kg kg−1 dry weight) | 43 | 125 |
| pH (−) | 7.9 | 8.5 |
| Porosity (%) | 70 | 58 |
| C/N ratio (−) | - | 18 |
| Special surface area (m2 g−1) | 0.282 | - |
