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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%