Study the Performance of Dissolved Air Flotation as Industrial Wastewater Treatment Method
AbstractThis research aimed to study the removal efficiency of oil pollutant from industrial wastewater by dissolved-air flotation (DAF) with and without chemical coagulants. The sample test of wastewater is discharged from Daura Refinery. The performance of dissolved air flotation for example saturation pressure and recycle ratio were studied. The industrial wastewater treated by DAF is carried out with two types of chemical coagulants: Alum and Polyacrylamid. The treatment method of wastewater by DAF with and without chemical coagulants and their effect on the removal efficiency of oil, results were obtained at different parameters such as saturation pressure (2,5-5.5atm) and recycle ratio (20-50). It has been found the oil removal efficiency (R %) increases with increase in recycle ratio (R.R) and saturation pressure (P). The maximum oil removal efficiency in DAF unit without coagulants is found to be equal to 60%, while with polyacrylamide coagulants is equal to 94, 90 %, while with alum coagulants is equal to 89, 82 % and with combination of alum+ polyacrylamide coagulants is equal to 98.96, 95.5 % for initial oil concentration (Co) 50, 200 ppm respectively. The experimental results were indicated the removal efficiency of oil by using polyacrylamide as alone is more effective than adding alum but combination of them, resulted improvement in removal efficiency. The experimental results of DAF process with coagulants are expressed in develop general empirical correlation by chemical cad in computer program.
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