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Pollutant concentration analysis of the unused and used stone media in the filtration chamber.
| Parameters | Unused (mg/kg) | Used (mg/kg) |
|---|---|---|
| N | 1000 | 1600 |
| P | 600 | 1200 |
| Cr | 255.4 | 4.4 |
| Cd | 14.7 | 0.3 |
| Ni | 11.2 | 5.9 |
| Cu | 22.2 | 3.1 |
| Zn | 28.6 | 1455.0 |
| Pb | 12.9 | 0.8 |
| Fe | 810.3 | 1944.7 |
| Mn | 86.5 | 31.9 |
