Primary treatment is designed to remove suspended or insoluble solids through a variety of processes. Primary treatment prepares the wastewater for further treatment in the secondary and tertiary stages. The various primary treatment involved are :

• Screening
• Wastewater Equalisation
• Oil-Water Separation/ Oil Skimming
• Coagulation, Flocculation and Sedimentation
• Chemical Dosing
• pH Adjustment/ Neutralisation
• Vacuum Evaporation