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1、JournalofHazardousMaterialsA135(2006)3239Mathematicalsimulationandlong-termmonitoringofleachatecomponentsfromtwodifferentlandfillcellsBestaminOzkaya∗,AhmetDemir,M.SinanBilgiliYildizTechnicalUniversity,EnvironmentalEngineeringDepartment,34349Besiktas,Istanbul,
2、TurkeyReceived24August2005;receivedinrevisedform17November2005;accepted21November2005Availableonline18January2006AbstractInthisstudywemonitoredfor920daysthesulfate(SO2−),chloride(Cl−),chemicaloxygendemand(COD)andbiologicaloxygendemand4(BOD)parametersinleacha
3、teproducedintwolarge-scaletestcellsattheOdayeriSanitaryLandfill,Istanbul,Turkey.Wepresentamathematicalmodeloftheseparameterconcentrationsinleachatesoftwotestcellswithonebeingthecontrol(C1)andtheother(C2)leachaterecirculation.Therelationshipbetweentheseparamet
4、ersandrefuseageissimulatedbyamathematicalformula.Theunknownconstantsofthesimulationformulaaresolvedbytheleastsquaresmethod,whichminimizesthesquaredtotalofdeviationfromthemodeloftheactualdatausingaMATLAB®computerprogram.Agoodfitwasobtainedbetweenthemeasureddat
5、aandmodelsimulations.CODconcentrationsinleachatefromC1andC2rapidlyattainedtheirmaximumvaluesof75and70g/l,respectively,after1monthoflandfilling.BODtoCODratiosarearound0.8forbothtestcellsduringtheacidogenicphase;thisratiothendecreasedto0.06.Asharpdecreaseinthec
6、oncentrationofCl−from14to15g/lwasobservedafterapproximately2monthsofoperation,followedbyaslowdecrease.SO2−concentrationsrapidlyreachedamaximumvalueof2000mg/l4within45days;developmentofanaerobicconditionscausedasharpdecreasetoaround75mg/lforC2and450mg/lforC1a
7、fter5monthsofoperation.TheresultsshowedthatthereappearedtobelittleimprovementinleachatequalitybyleachaterecirculationintermsofCODandBODvalues,however,itisdeterminedthatthepollutionloadsmorerapidlyreachedminimumvalueswithintheC2testcell.©2005ElsevierB.V.Allri
8、ghtsreserved.Keywords:Landfill;Leachate;Longterm;MSW;Recirculation;Simulation1.Introductionbilizationfromseveraldecadesto23years,thusminimizingtheopportunityforlong-termadverseenvironmentalimpact
