Techno-economical evaluation of fluoride removal by electrocoagulation process

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1、Desalination271(2011)209–218ContentslistsavailableatScienceDirectDesalinationjournalhomepage:www.elsevier.com/locate/desalTechno-economicalevaluationoffluorideremovalbyelectrocoagulationprocess:Optimizationthroughresponsesurfacemethodologyaa,⁎,M.AramibM.Be

2、hbahani,M.R.AlaviMoghaddamaCivilandEnvironmentalEngineeringDepartment,AmirkabirUniversityofTechnology(AUT),HafezSt.,Tehran,15875-4413,IranbTextileEngineeringDepartment,AmirkabirUniversityofTechnology(AUT),HafezSt.,Tehran,15875-4413,Iranarticleinfoabstract

3、Articlehistory:Inthisresearch,responsesurfacemethodology(RSM)wasappliedtoevaluatetheeffectofmainoperationalReceived11October2010variablesincludinginitialpH,initialfluorideconcentration,currentdensityandreactiontimefortheremovalofReceivedinrevisedform11Dece

4、mber2010fluorideanditsrelativeoperatingcostsbyelectrocoagulation.ItwasfoundthattheeffectofinitialpHwasAccepted13December2010negligibleonfluorideremovalefficiencyandoperatingcosts.Withthedecreaseofinitialfluorideconcentration,Availableonline14January2011fluorid

5、eremovalefficiencyimproved;however,ithadnoeffectonoperatingcosts.Ontheotherhand,theincreaseofcurrentdensityandreactiontimeseverelyinfluencedprocessperformanceandincreasefluorideKeywords:Electrocoagulationremovalefficiencyandoperatingcosts.AccordingtotheANOVA(

6、analysisofvariance)results,themodels2FluorideremovalefficiencypresentedthehighRvaluesof96.5%and97.3%forfluorideremovalefficiencyandoperatingcosts,respectively.OperatingcostsTheoptimuminitialpH,initialfluorideconcentration,currentdensityandreactiontimewerefoun

7、dtobe7,Responsesurfacemethodology225mg/l,0.0167A/cm,25min,respectively,fortheremovaloffluoride.Fluorideremovalefficiencyof94.5%wasobservedintheexperimentatoptimumconditionswhichconfirmedclosetomodelpredicted(90%)result.©2010ElsevierB.V.Allrightsreserved.1.In

8、troductionVarioustechnologiesbasedonmembraneprocessesandadsorp-tionswereusedforfluorideremoval[8].Electrocoagulation(EC)isFluorideconcentrationslessthan1mg/larebeneficialtopreventanothermethodwhichhasbeenusedwidelytor