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| Elements | K, mg L−1 | Ca, mg L−1 | Mg, mg L−1 | Elements | K, mg g−1 | Ca, mg g−1 | Mg, mg g−1 |
|---|---|---|---|---|---|---|---|
| Supernatant (R1) | 291 | 663 | 259 | Sludge solids (R1) | 1.9 | 13.9 | 5.2 |
| Supernatant (R3) | 262 | 16.2 | 3.16 | Sludge solids (R3) | 11.5 | 43.6 | 18.4 |
