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1、JournalofEnvironmentalManagement97(2012)22e27ContentslistsavailableatSciVerseScienceDirectJournalofEnvironmentalManagementjournalhomepage:www.elsevier.com/locate/jenvmanNitrogenremovalfromlandfillleachateinconstructedwetlandswithreedandwillow:Redoxpotentialintherootzonea,*bcbAndrzejBia1ow
2、iec,LauraDavies,AntonioAlbuquerque,PeterF.RandersonaUniversityofWarmiaandMazuryinOlsztyn,DepartmentofEnvironmentalBiotechnology,ul.Sloneczna45G,10-900Olsztyn,PolandbSchoolofBiosciences,CardiffUniversity,CardiffCF103AX,UKcDepartmentofCivilEngineeringandArchitecture,UniversityofBeiraInteri
3、or,Edificio2dasEngenharias,CalcadaFontedoLameiro,6201-001Covilha,PortugalarticleinfoabstractArticlehistory:ThisstudyinvestigatedtheeffectsofreedandwillowonbioremediationoflandfillleachateinReceived30July2010comparisonwithanunplantedcontrolbymeasuringredoxpotentiallevelsintherhizosphereofRe
4、ceivedinrevisedformmicrocosmsystemsinagreenhouse.Plantshadasignificantinfluenceonredoxpotentialrelativetothe16May2011plant-lesssystem.Redoxpotentialinthereedrhizospherewasanoxic(mean10285mV),butitwasAccepted25November2011theleastnegative,beingsignificantlyhigherthaninthewillow(mean28611
5、8mV),whichhadtheAvailableonline24December2011lowestEh.Redoxpotentialfluctuatedsignificantlyinthewillowrhizosphereduringdaylighthours,withlargedecreasesinthemorning.LevelsofNHþdecreasedsignificantlyinthefirstdayoftheexperimentKeywords:4andremainedatsimilarlowlevelsinallthreevariantsforthenext
6、fourweeksoftheexperiment.LandfillleachateFollowingthisremovalofammoniasignificantpeaksinNOoccurredinthecontrolandreedtanksonConstructedwetland2the1stday,andagainon14thdayinthecontroltankupto13mg/dm3.InthewillowtanktherewasalsoRedoxpotentialonesignificantpeakofNOinthefirstweek,butonlyupto0.
7、5mg/dm3.Significantaccumulation,withinNitrogenremoval221daysofNO3inallvariantswasobserved,butintankswithreedandwillowtheconcentrationofNO3remainedsignificantlylower(<4mg/dm3)thanintheunplantedtank(w35mg/dm3).Finallevelsoftotal-nitrogen,nitrateandchemicaloxygendemandwereco
