Table 4 Washing behavior of the two washing processes
Item | First washing process | Secondary washing process | Total washing percentage (%) | ||
|---|---|---|---|---|---|
FWFA | Wastewater | SWFA | Wastewater | ||
Al | 61.8 | 38.2 | 71.0 | 29.0 | 59.9 |
Ca | 27.6 | 72.4 | 45.0 | 55.0 | 78.2 |
Cd | 96.1 | 3.9 | 95.0 | 5.0 | 8.6 |
Co | 40.2 | 59.8 | 64.9 | 35.1 | 75.6 |
Cr | 77.1 | 22.9 | 90.3 | 9.7 | 33.6 |
Cu | 51.1 | 48.9 | 60.9 | 39.1 | 52.7 |
Fe | 83.3 | 16.7 | 94.0 | 6.0 | 11.8 |
K | 14.2 | 85.8 | 24.1 | 75.9 | 94.7 |
Mn | 36.6 | 63.4 | 49.5 | 50.5 | 70.9 |
Mg | 35.3 | 64.7 | 51.2 | 48.8 | 83.6 |
Na | 23.0 | 77.0 | 12.5 | 87.5 | 97.2 |
Ni | 29.3 | 70.7 | 2.4 | 99.9 | 81.2 |
Pb | 80.7 | 19.3 | 95.9 | 4.1 | 38.6 |
Si | 46.8 | 53.2 | 83.4 | 16.6 | 41.7 |
Zn | 47.9 | 52.1 | 40.0 | 60.0 | 72.7 |
Cl− | 21.2 | 78.8 | 30.5 | 69.5 | 93.1 |