不同渗滤液循环方式对填埋层甲烷产生的影响

:0253-2468(2004)02-0304-05　　　:X705　　　:A张晓星,何品晶＊,邵立明,李国建　(,　200092):,.:、(SBR)、.:COD、VFA,,;COD、VFA,、;,,100%.:;;;;EffectsonlandfillmethaneproductionbydifferentleachaterecirculationoperationsZHANGXiaoxing,HEPinjing,SHAOLiming,LIGuojian　(StateKeyLaboratoryofPollutionControlandReuse,TongjiUniversity,Shanghai　200092)Abstract:Atpresent,comprehensiveandsuccessfulstudyonleachaterecirculationtechniquetodegradetheorganicpollutantsinthefreshMSWlandfillindevelopingcountry,whichcharacterizedoffoodwastebeingthemainbiodegradablecomponent,islack.Inthispaper,lab-scalelandfillcolumnsthatsimulatedthefreshMSWlandfillbasedontheMSWcompositioninChina,effectsonmethaneproductionbydiffer-entleachaterecirculationoperationswerestudied.Duringtheexperimentalcourse,leachatewithoutanypretreatment,leachatepretreatedbyaerobicprocess(SBR)ormixedwithleachatefrommineralizedlandfillwasrecirculatedtolandfillcolumnsrespectively.TheresultsindicatethatCODandVFAconcentrationinleachateattheinitialstageswashigher.Suchleachaterecirculatingtolandfillcolumnsdirectlyorwithoutanypretreatmentwouldleadtoaccumulationofthevolatilefattyacid(VFA)andtoinhibitionofmethanefermentation.Whenleachatewaspretreatedtosomeextentthenrecirculatingtolandfillcolumnswouldgreatlyshortenthemethaneproductionlagphasetimeandspeedupthemethanefermentation.Onlywhenmethanefermentationiscreatedandmaintainedsteadily,thelandfillorganicpollutantcanbebiodegradedeffectively,andnearly100percentoftheorganicpollutantisconversedtolandfillgas.Keywords:leachaterecirculation;landfillmethaneproduction;methaneproductionlagphasetime;volatilefattyacid(VFA);ratiooforganiccarbonconvertedtogas:2003-04-17;:2003-09-07:“”863(2001AA644010);():(1980—),,;＊()20a[1],[2],[2,3].[4,5].,[6].,,:①、[7];②(1a)[4,5].(24220043　　　　　ACTASCIENTIAECIRCUMSTANTIAEVol.24,No.2Mar.,2004DOI:10.13671/j.hjkxxb.2004.02.023),.,.1　1.1　,[8].()()85%,5.0%,7.0%,1.6%,1.0%,0.4%.5cm,.1　Fig.1　Theexperimentalequipmentsandflowchart1.2　,,:400mm、2200mm,210L,,;,(BSD-0.5),.435℃(1).1,,1,10%,(1);2;386d,SBR,87d;4.1　＊Table1　ThemeanmonthlyprecipitationinNanhui,Shanghaimm12345678910111244.162.379.3103.1126.2153.093.2115.1173.656.750.842.5＊　2002《》2　Table2　AnalyticalparametersandanalyticalmethodsBSD-0.5CODCH4GC102VFAGC122CO2pHPHS-25pH1.3　2.2　2.1　[9].5%,.233052::1、2、34263d,56d,21d42d.1,2,34,:.2　Fig.2　Profileofmethaneconcentrationinsimulatedlandfillcolumnreactors3　Table3　Methaneproductionlagphasetimeinsimulatedlandfillcolumnbioreactors1234d-a)56214220%d-a)-a)427650%d-a)-a)92104　a.2.2　50%,,.5%50%.3　Fig.3　Profileofchangingrateofmethaneconcentrationinsimulatedlandfillcolumnreactors3:2,,10%,,10%.3(0.50%～1.50%·d-1),30%,0.50%·d-1,50%,71d.4(0.50%·d-1),20%(0.50%～2.50%·d-1),62d.2.3　,.、,.4.,4　Table4　Thequantityandqualityofrecirculatingleachateinsimulatedlandfillcolumnreactors123b)86d86d4(mm·d-1)0.42020206COD(mg·L-1)0a)55000～65000300～90012000～1800019000～22000VFA/(mg·L-1)0a)25000～380001003000～90008000～10000NH+4-N/(mg·L-1)0a)1450～16500～100300～450600～800pH6.95.6～5.88.0～8.45.6～6.56.0～6.5a);b)86dSBR,87d306　　　　　　　　　　24.2,3,4COD、VFApH.COD(VFA),pH.2.4　[10],、3[10].,[10],1,(VFA),.4　Fig.4　Profileoftheratiooforganiccarbonconvertedtogas1(VFA、pH),,,.2VFA、pH,,,(,)[11,13].3VFA,pH8,,、,()[12],;,pH、VFA,,[13].4,VFA,pH,,,;VFA,,,3,.432[14].,VFA[13],VFA,pH,.2.5　.=+4,3、0.05,0.05～0.800.801.,(90%),COD,40000～70000mg·L-1,,CO2(80%).,3072:,,CH4CO2,CODVFA,CH4,,.,COD2000mg·L-1,VFA,,50%,,1.,,,.3　　　(1)COD、VFA,VFA,,.(2)COD、VFA,;(50%),,100%.(3),COD、VFA,,.(4),,.:[1]　PohlandFG.Landfillbioreactors:Historicalperspective,fundamentalprincipals,andnewhorizonsindesignandoperations[A].VasukiNC.SeminarPublicationLandfillBioreactorDesignandOperation[C].Washington:U.S.EPA,1995:9—24[2]　CarsonDA.Themunicipalsolidwastelandfilloperatedasabioreactor[A].VasukiNC.SeminarPublicationLandfillBioreactorDesignandOperation[C].Washington:U.S.EPA,1995:1—8[3]　PohlandFG,KimJC.Insituanaerobictreatmentofleachateinlandfillbioreactors[J].WatSciTech,1999,40(8):203—210[4]　,,,.[J].,2003,16(4):10—12[5]　,　,,.[J].,2003,16(4):7—9[6]　VasukiNC.Paneldiscussion[A].VasukiNC.SeminarPublicationLandfillBioreactorDesignandOperation[C].Washington:U.S.EPA,1995:193—228[7]　LeszkiewiczJJ,McAulayPB.Municipalsolidwastelandfillbioreactortechnology:closureandpostclosureissues[A].VasukiNC.SeminarPublicationLandfillBioreactorDesignandOperation[C].Washington:U.S.EPA,1995:81—122[8]　,,.[M].:,2003[9]　LayJiunnJyi,LiYY,NoikeTT.Mathematicalmodelformethaneproductionfromlandfillbioreactor[J].JournalofEnvironmentalEngineering,1998,124(8):730—736[10]　,,.[M].:,1996:1—82[11]　BorzacconiL,LopezI,AnidoC.HydrolysisconstantandVFAinhibitioninacidogenicphaseofMSWanaerobicdegradation[J].WatSciTech,1997,36(6-7):479—484[12]　MartinDJ.Anovelmathematicalmodelofsolid-statedigestion[J].BiotechnologyLetters,2000,22:91—94[13]　VavilinVA,SchelkanovMYu,LokshinaLYa.Acomparativeanalysisofabalancebetweentheratesofpolymerhydrolysisandacetoclasticmethanogenesisduringanaerobicdigestionofsolidwaste[J].WatSciTech,2002,45(10):249—254[14]　VasilyAV,SergeyVR.Distributedmodelofsolidwasteanaerobicdigestioneffec