Aim of this study was to determine efficiency of coagulation/flocculation process for the removal
of suspended solids (SS), color, COD and oil and grease (O&G) from biodiesel wastewater using Aluminum sulfate,
polyaluminum chloride, ferric chloride and ferric sulfate. This study also investigates optimum coagulant dosage on
the coagulant process. The optimization of these factors may significantly increase the process coagulation and
flocculation efficiency.