电絮凝-Pretreatment of Brackish Water Using DC-Electr

电絮凝-Pretreatment of Brackish Water Using DC-ElectrocoagulationIran.J.Chem.&Chem.Eng.VoL21,No.1,2002PretreatmentofBrackishWaterUsingDC-Electrocoagulation-MethodandOptimizationDaneshvar*+,Nezameddin;Ashassi,HabibandRakhshaei,RohanDepartmentofAppliedChemistry,FacultyofChemistry,TabrizUniversity,Tabriz,51664,J.R.Iran.ABSTRACT:Electrochemicallygeneratedironcanremovemostcontaminantspresentinwaterandwastewater,byprecipitation,adsorption,electrostaticinteraction,andcomplexformation(generallycalledelectrocoagulation-EC).Inthepresentpaper,pretreatmentofbrackishwaterhavinghightotalhardness(TH),alkalinity(.4),SO/-andCrions,isstudiedbyapplicationofaDC-electricalcurrenttotheironelectrodes.Operatingparameterssuchaselectricalcurrentdensity,volumeflow,surfaceareaofelectrodes,distancebetweenthetwoelectrodes,watertemperature,aeratingflow,retentiontime,contacttimeofproducedsludgebeforeandaftertheprocess,additionofcoagulantaid(bentonite)andthecolloidaladditive(clayparticles)wereopti-mized.Theresultsofthiss