title: Survey of dissolved air flotation system efficiency for reduce of pollution of vegetable oil industry wastewater.
abstract: The aim of this research was to sudy the reduction of pollution of vegetable oil manufacturing wastewater with DAF system. At first phase of this examination, the optimum dosage of the coagulants was determined. The coagulants that used in this study were Alum and Ferric Chloride. The second phase was flotation in this series of examinations, oil, COD, total solid, volatile solid, fixed solid and suspended solid measured in raw wastewater and the effluent of the DAF pilot. Optimum value of pH for alum and ferric chloride obtained 7.5 and 5.5, respectively. Optimum dosage for these obtained 30 and 32 mg L(-1) in this research. Mean removal for the parameters ofoil, COD, total solid, volatile solid, fixed solid and suspended solid obtained 75.85, 78.27, 77.32, 82.47, 73.52 and 85.53%, respectively. With pressure rising from 3 to 4 and 5 atm removing rate of COD, total solid, volatile solid, fixed solid parameters reduced, but oil and suspended solid have increase. In addition, following increase of flotation time up to 120 sec all of the measured parameters have increase in removing rate. Optimum A/S for removal of COD, total solid, volatile solid, fixed solid parameters obtained 0.001 and for oil and suspended solid obtained 0.0015.
authors.affiliation: Department of Environmental Health, Faculty of Health, Gonabad University of Medical Sciences, Iran.
authors.forename: H
authors.initials: H
authors.lastname: Keramati
authors.forename: H
authors.initials: H
authors.lastname: Alidadi
authors.forename: A R
authors.initials: AR
authors.lastname: Parvaresh
authors.forename: H
authors.initials: H
authors.lastname: Movahedian
authors.forename: A H
authors.initials: AH
authors.lastname: Mahvi
mesh_terms: D000388:Air; D000534:Alum Compounds; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002712:Chlorides; D005290:Ferric Compounds; D007220:Industrial Waste / Q000517:prevention & control*; D010865:Pilot Projects; D010938:Plant Oils; D014865:Waste Disposal, Fluid / Q000379:methods; D014877:Water Pollution, Chemical / Q000517:prevention & control*
chemical_list: D000534:Alum Compounds; D002712:Chlorides; D005290:Ferric Compounds; D007220:Industrial Waste; D010938:Plant Oils; C041524:aluminum sulfate; C024555:ferric chloride