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刘 凌,陆桂华(, 210024):。,:/、、,,、;Monte-Carlo,,,,8,4-Cl-PCBs69.4%75%,4-Cl-PCBs10.9%75%;4-Cl-PCBs16.2075%,20.9%75%。 :;;;:X131 :A :1001-6791(2003)01-079-06:2002-09-12;:2002-12-03:(59909003);: (1964-),,,,,。,、[1],[2]。(PCBs),,,、。、,。,、[3]。,,,,,。,[4]:,-,;GhoshWeber[5]、,,,“”。,,PCBs:,,,。,,[6],PCBs“”,;,,,,。,,,,,,,,。4～5,(4-Cl-PCBs)。14120031 ADVANCESINWATERSCIENCEVol.14,No.1 Jan.,2003 DOI:10.14042/j.cnki.32.1309.2003.01.0141 ,,1,,,,,,。, 1 Fig.1SchematicmapofbiodegradationofPCBsinwetlandsystem,,。,(1-θ)ρSRt+(1-θ)ρSIt+θCPt=1r2rθDPr2CPr (1) SR,mg/kg;SI,mg/kg;CP,mg/L;ρ,kg/L;θ;DP,cm2/h;t,h;r,cm。(1)CPrr=0 t≥0(2)εdCdt=-εKCKS+C-(1-ε)ρ′ASθDPCPrr=a t≥0(3)CPt=0=Ct=0=C0 0≤r≤a(4)SRt=0=KdC0=S0 0≤r≤a(5) ε;C,mg/L;KS,mg/L;K,mg/(L·h);ρ′;AS,cm2/kg;a,cm;C0,mg/L;S0,mg/kg。/:SR=KdCP(6) Kd-,L/kg。,,,,,,,,。:SIt=KISR=KIKdCP(7) KI,1/h。(2),。(3),,,,8014Monod。(4)(5),,。。2 ,。Mossna,1.5m,7m,,15cm,15cm10cm,,、,,,。,2%,,,,。1995,,10(71d),,PCBs:、25%～35%、pH6.5～7.5、15℃～20℃、(N10～25mg/kg,P5～10mg/kg)。10,,,PCBs、。,。3 ,-KdDP,[7,8],KI,[9],[10]。,,,1,,(8)(9)。p(x)=12πσexp-(x-μ)22σ2 (x∈R) ()(8)p(x)=12πσ1xexp-(lnx-μ1)22σ21 (x0) ()(9)1 Table1Distributionresultsofinputparameter ρ/(kg·L-1)2.60.039μ=2.6,σ=0.039θ0.10.008μ=0.1,σ=0.008ε0.40.021μ=0.4,σ=0.021a/mm0.010.003μ=0.01,σ=0.003Kd/(L·kg-1)857069.64μ1=9.056,σ1=0.008126K()/(mg·L-1·h-1)0.0240.0025μ=0.024,σ=0.0025K()/(mg·L-1·h-1)0.00150.0003μ=0.0015,σ=0.0003KS/(mg·L-1)4.2×10-41.5×10-5μ=4.2×10-4,σ=1.5×10-5KI/h-17.0×10-61.4×10-7μ=7.0×10-6,σ=1.4×10-7DP/(cm2·h-1)0.02110.0012μ=0.0211,σ=0.0012S0/(mg·kg-1)43.22.82μ1=3.7637,σ1=0.0652181 1 、:4 ,。2 Fig.2Comparisonof4-Cl-PCBmeasurementswiththesimulation1,2,,ST/S04-Cl-PCBs,ST4-Cl-PCBs,:4-Cl-PCBs(SRA),4-Cl-PCBs(SIA);S04-Cl-PCBs;;AB,PB。2,,30%,,。5 ,,,。 3 Fig.34-Cl-PCBdegradationcurveinsoil1,4-Cl-PCBs3,,SRA/S04-Cl-PCBs,SIA/S04-Cl-PCBs,ST/S04-Cl-PCBs。3,,4-Cl-PCBs,4-Cl-PCBs,,4-Cl-PCBs,,,14,,4-Cl-PCBs,4-Cl-PCBs,4-Cl-PCBs,。,4-Cl-PCBs,4-Cl-PCBs,,4-Cl-PCBs。3,26%4-Cl-PCBs,14,19%4-Cl-PCBs,。,4-Cl-PCBs,14。,,。1,Monte-Carlo,,200,,200,,,:4-Cl-PCBs8(10,),2。8214,8,4-Cl-PCBs13.37mg/L(69.4%)75%,4-Cl-PCBs19.42mg/L(58.5%)95%;4-Cl-PCBs4.55mg/L(4-Cl-PCBs10.9%)75%,4-Cl-PCBs8.86mg/L(4-Cl-PCBs19.7%)95%;4-Cl-PCBs8.67mg/L(4-Cl-PCBs19.9%)75%,4-Cl-PCBs10.38mg/L(4-Cl-PCBs22.5%)95%。84-Cl-PCBs(),,2004-Cl-PCBs,19795%,,:μ1=2.34,σ1=0.354。2 4-Cl-PCBs8Table2Distributionof4-Cl-PCBconcentrationinsoilafter8years'biodegradationST/(mg·L-1)ST/S0SRA/(mg·L-1)SRA/S0SIA/(mg·L-1)SIA/S05.050.1230.05690.0014.930.12025%7.730.1851.130.0286.660.15750%()10.330.2402.660.0647.490.17875%13.370.3064.550.1098.670.19995%19.420.4158.860.19710.380.22524.560.52812.490.27412.070.25411.070.2553.310.0767.760.1794.140.0862.740.0601.480.0283 4-Cl-PCBTable3Calculationdistributionof4-Cl-PCBconcentrationinsoilattheend-pointSIA/(mg·L-1)SIA/S0/a4.940.1209.2925%6.730.15912.4350%()7.820.18314.4375%9.170.20916.2095%11.720.25319.8114.770.31525.328.140.18814.591.910.03713.03 4-Cl-PCBs3。,4-Cl-PCBs,,,,9.17mg/L(20.9%4-Cl-PCBs)75%,11.72mg/L(25.3%4-Cl-PCBs)95%;16.2075%;4-Cl-PCBs19.8195%;4-Cl-PCBs,14.59,18.8%4-Cl-PCBs,。4-Cl-PCBs(),,200,19995%,,:μ1=2.66,σ1=0.200。6 (1)/、、,,、83 1 、:。(2)Monte-Carlo,,,,8,4-Cl-PCBs58.5%95%,4-Cl-PCBs19.7%95%;4-Cl-PCBs19.8195%,25.3%95%。(3),84-Cl-PCBs,μ1=2.34,σ1=0.354;4-Cl-PCBs,μ1=2.66,σ1=0.200。:[1],.[J].,2001,21(2):157-161.[2]WetzelRG.Constructedwetlandsforwaterqualityimprovement[M].BoaRaton,FL:CRCPress,1993,3-20.[3]BrownJR,BedardDL,BrennanMJ.Polychlorinatedbiphenyldechlorinationinaquaticsediments[J].Science,1987a,236:709-712.[4] ,.[J].,2000,11(4):401-407.[5]GhoshU,WeberS,JensenJN,etal.RelationshipbetweenPCBdesorptionequilibrium,kinetics,andavailabilityduringlandbiotreatment[J].EnvironSciTechnol,2000,34:2542-2548.[6]LuthyRG,AikenGR,BruseauML.Sequestrationofhydrophobicorganiccontaminantsbygeosorbents[J].EnvironSciTechnol,1997,31:3341-3347.[7]CurtisGP,RobertsPV,ReinhardM.Anaturalgradientexperimentandsolutetransportinasandaquifer:4.Sorptionoforganicsolutesanditsinfluenceonmobility[J].WaterResourceResearch,1986,22:2059-2067.[8]HaydukW,LaudieH.Predictionofdiffusioncoefficientsfornon-electrolytesindiluteaqueoussolutions[J].AIChEJ,1974,20:611-615.[9]AdeelZ,LuthyRG,DzombakDA,etal.LeachingofPCBcompoundsfromuntreatedandbiotreatedsludge-soilmixtures[J].JournalofCon-taminantHydrology,1997,28:289-309.[10] ,,.[J].,2002,3(2):1-6.PCBbiodegradationinconstructedwetlandandcontaminationriskanalysisLIULing,LUGui-hua(WaterResourcesDevelopmentandUtilizationLaboratory,HohaiUniversity,Nanjing210098,China)Abstract:PCBbiodegradationinconstructedwetlandcouldbedescribedquantitativelywithamathematicalmodel,whichwasestablishedconsideringthesorption/desorption,sequestration,diffusionandbiodegradationprocesses.ThemodelsimulationswereperformedinthispapertopredictthePCBs'degradationbehavior,thenecessarytreatmenttimeandtheend-point.UsingtheMonte-Carlosimulationtechniques,thecontaminationriskanalysisforPCBbiodegradationinconstructedwetlandwascon-ducted.Itisnoteworthythat,after8years'biodegradation,nolessthan69.4%4-Cl-PCBsinsoilwouldhavebeendegradedwith