Treatment of landfill leachate by coagulation-flocculation process using red earth as coagulant

In this study, the comparative suitability of red earth and alum as coagulants in the treatment of stabilized leachate from Padang Siding Landfill Site were evaluated via a series of Jar Test experimental works. The red earth effectively removed 53.9% of COD, 90.0% of turbidity and 46.7% of NH3-N at optimal pH value of 2.0 with dosage of 8000 mg/L. On the other hand, the optimal pH 5.0 of alum with optimal coagulant dosage of 9000 mg/L induced 66.9% COD reduction, 96.2% turbidity removal and 43.3% NH3-N removal from the same leachate sample.