Table 4 Mineral content of coffee waste sludge
From: Bio-ethanol production from wet coffee processing waste in Ethiopia
| Mineral | Amount |
|---|---|
| Manganese | 1.74 mg/kg |
| Magnesium | 137 mg/kg |
| Zinc | 5.28 mg/kg |
| Iron | 45.5 mg/kg |
| Copper | 4.02 mg/kg |
| Nitrogen | 0.56% |
| Phosphorus | 0.15% |
| Potassium | 0.50% |