Application-of-Doehlert-matrix-to-determine-the-optimal-conditions-for-landfil

J.Mater.Environ.Sci.3(3)(2012)426-433Trabelsietal.ISSN:2028-2508CODEN:JMESCN426ApplicationofDoehlertmatrixtodeterminetheoptimalconditionsforlandfillleachatetreatmentbyelectro-FentonprocessSouhailaTrabelsi1,2,3,NihalOturan1,NizarBellakhal2,3,MehmetA.Oturan1,*1LaboratoireGéomatériauxetEnvironnement,EquipeChimiedel’Environnement,UniversitéParis-Est77454Marne-la-ValléeCedex2,France2DépartementdeGénieChimiqueetBiologique,InstitutNationaldesSciencesAppliquéesetdeTechnologie1080Tunis,Tunisie3LaboratoiredeChimieAnalytiqueetd’Electrochimie,FacultédesSciencesdeTunisCampusUniversitaire2092,ElManarTunisReceived1Feb2012,Revised1March2012,accepted1March2012*Correspondingauthor:Mehmet.oturan@univ-paris-est.frAbstractThedegradationofrecalcitrantorganicmatterpresentinlandfillleachates(whicharehazardousandheavilypollutedwastewaters)hasbeenstudiedbyelectro-FentonprocessusingaPtanodeandacarbonfeltcathode.Thisprocessexhibitsgreatoxidationabilityduetotheinsituproductionabilityofhydroxylradicals(●OH)atlargeextentfromelectrochemicallyassistedFenton’sreactionwhichtakesplacebetweenelectrogeneratedH2O2andFe2+inhomogeneousmedium.H2O2andFe2+aregeneratedbysimultaneousreductionatthecathodeofdissolvedO2andadded(atcatalyticamount)Fe3+ions.●OHthusgeneratedreactonorganicpollutantsuntiltheirmineralization.TheoptimaloperatingparametersforthemineralizationoforganicpollutantshavebeeninvestigatedbyusingDoehlertmatrix.Ithasbeendemonstratedthatundertheoptimalconditionsdeterminedbythismethod,electro-Fentonprocesscanleadtoaneffectivemineralizationdegreeof78%oflandfillleachatesolutionafter8hoftreatment.Theobtainedresultsshowtheefficiencyoftheelectro-Fentonprocesstoremoveorganicpollutantsfromaqueousmedium.Keywords:Landfillleachates,Electro-Fenton,Doehlertmatrix,Hydroxylradical,Mineralization.1.IntroductionThedegradationoftheorganicfractionofthemunicipalsolidwasteinlandfillincombinationwiththepercolationofrainwater[1-2]producesaliquidcalledleachate.Thecompositionofthisleachatedependsonavarietyofparameters,suchas