Landfill Leachate Pretreatment by Coagulation/Flocculation Process : Optimization by response surface methodology

Abstract

In this work, FeCl3 has proven its capacity to keep suspended solids and chemical oxygen demand through the coagulation/flocculation process of the landfill leachate pretreatment. The experimental variables (pH and coagulant dosage) were optimized by applying response surface methodology equipped with the central composite faced design. Results showed that the reduction efficiencies for turbidity and COD at pH 5 and FeCl3 dosage of 3.12 g/L were recommended to achieve final values of 8.1 NTU and 225.2 mg/L(O2) for turbidity, and COD respectively.