Table 2.
Concentrations and HVEP results of heavy metals in residues.
| Heavy metals | Content of trace elements (mg/kg) | HVEP leaching results of heavy metals (mg/L) | Identification Standard for hazardous wastes [9] (mg/L) | Environmental Quality Standards for surface water IV [10] (mg/L) |
|---|---|---|---|---|
| Cu | 128.85 | n.d. | 100 | 1.0 |
| Zn | 1279.24 | n.d. | 100 | 2.0 |
| Cd | n.d. | n.d. | 1 | 0.005 |
| Pb | 212.56 | n.d. | 5 | 0.05 |
| Cr | n.d. | n.d. | 15 | 0.05 |
| Be | n.d. | n.d. | 0.02 | — |
| Ba | 1046.80 | 0.84 | 100 | — |
| Ni | n.d. | n.d. | 5 | — |
| Ag | n.d. | n.d. | 5 | — |
| As | 5552.40 | 8.35 | 5 | 0.1 |
| Se | n.d. | n.d. | 1 | 0.1 |