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1、Wat.Res.Vol.28,No.5,pp.1077-1086,1994~PergamonCopyright©1994ElsevierScienceLtdPrintedinGreatBritain.Allrightsreserved0043-1354/94$6.00+0.00MODELINGOFELECTROCHEMICALLY-ACTIVATEDDENITRIFYINGBIOFILMSYUTAKASAKAKIBARAj,JOSEPHR.V.FLORAl,MAKRAMT.SUIDANI*andMASAOKURODA2'DepartmentofCivilandE
2、nvironmentalEngineering,UniversityofCincinnati,Cincinnati,OH45221-0071,U.S.A.and2DepartmentofCivilEngineering,GunmaUniversity,Kiryu-shi,Gunma376,Japan(FirstreceivedFebruary1993;acceptedinrevisedformAugust1993)Abstract--Theabilityofanelectrode-biofilmsystemtoreducenitratehasbeenexperi
3、mentallydemon-strated.Inthissystem,adenitrifyingbiofilmisattachedtoanelectrodeandtheH2producedbytheelectrolysisofwaterisusedforthereductionofNO~-toN2gas.Completedenitrificationwasachievedinthepresenceofanelectriccurrent.Asteady-statebiofilmmodeldescribingthesystemispresented.Themodel
4、takesintoaccountthemasstransferrates,biologicalreactionratesandelectrochemicalreactionratesofH+,OH-,H2,NOA-andsupportingelectrolytes.Thedenitrificationratescalculatedusingthemodelareinfairlygoodagreementwithexperimentalresults.Thenetdenitrificationrateisaffectedsignificantlybytheelec
5、triccurrentanditsresponsecanbedividedintothreeregions,namely,the"linear,""plateau"and"decline"regions.Theoverallfeasibilityoftheelectrode-biofilmsystemistheoreticallydemonstrated.Keywords--biofilmmodel,denitrification,electricfield,electrochemicalbiofilmreactor,H2utilization,masstran
6、sferNOMENCLATURESubscriptsA=totalsurfaceareaofcathode(cm2)C=referstotheboundarylayerC=concentrationofconstituent(mol/1ormol/cm~)f=referstothebiofilmD=diffusioncoefficient(cm2/day)i=ionicspeciesEr=effectivenessfactor(--)j=referstoneutralandionicspeciesF=Faraday'sconstant(C/mol)Supersc
7、ript1=electriccurrent(C/sormol-e/day)J=molarfluxofconstituent(mol/cm2/day)*=bulkconcentration(mol/1ormol/cm2)=netdenitrificationrate(mol/cm2/day)K,,K2=firstandseconddissociationconstantsforcarbon-INTRODUCTIONateions(--)Km.i=half-velocitycoefficientfortheutilizationofcon-Thepublicheal
8、thstandardfo
