| Biosorbent | Bulk density (g·L−1) | Reference |
| HP-GH | 0.01 | This study |
| W-GH | 0.03 | This study |
| R-GH | 0.05 | This study |
| HP-WMR | 0.41 | [20] |
| DW-WMR | 0.46 | [20] |
| U-WMR | 0.61 | [20] |