Draghici, EcaterinaEcaterinaDraghiciCosma, GeorgetaGeorgetaCosmaCosma, CristianaCristianaCosmaBallo, AurelieaAurelieaBalloNicolau, MargaretaMargaretaNicolauToma, DorinaDorinaTomaBalalia, AncutaAncutaBalaliaMitila, StefaniaStefaniaMitila2017-04-192017-04-192000-12-29Patent no. RO116271­-B1http://hdl.handle.net/123456789/845Patent Assignee Name(s) and Code(s): SC PETROSTAR SA; INST CERC PROI EPURAREA APELOR REZIDUALEProcess 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.en-USBiological treatmentEffluentWastewaterOil industryPatent