Process for treatment of effluent from oil extraction industry

Process secures separation of water from oil products by treatment of effluent in a first physical­-chemical phase by coagulation ­flocculation in two steps, followed by biologic treatment in two steps and sand filtration. Coagulation-­flocculation consists of a step with cationic polyelectrolyte, 1-­2.5g/m3 active substance dose and a step with 60-­89g/m3 aluminium sulphate, followed by gravitational separation. Biological treatment phase is done in two steps with immersed aerobic filters and in a system using granulated active charcoal.