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The average concentration of heavy metals in the tannery wastewater sample before treatment.
| Metals | Initial concentration in the tannery effluent (mg/l) | Concentration in the US EPA guidelines (mg/l) | |
|---|---|---|---|
| Chromium (Cr) | 225 | 0.1 | |
| Cadmium (Cd) | 15.4 | 0.1 | |
| Copper (Cu) | 2.8 | 1.0 | |
| Lead (Pb) | 14.5 | 0.2 | |
| Nickel (Ni) | 6.5 | 0.1 | |
| Iron (Fe) | 10.5 | 0.3 | |
| Manganese (Mn) | 2.5 | 1.0 | |
