污水处理工艺对污泥热处理特性的影响

第37卷第4期燃料化学学报V01．37No．42009年8月JournalofFuelCheITlistryandTechnologyAug．2009文章编号：0253-2409(2009)04-0501-05EffectofwastewatertreatmentprocessesonthermaltreatmentpropertiesofsewagesludgeXIELi—ping，ZHENGShi—mei，LITao(SchoolofEnvironmental＆ChemicalEngineering，TianjinPolytechnicUniversity，Tianjin300160，China)Abstract：Thepropertiesofpyrolysisandcombustionforfivedifferentsewagesludgesa11estudiedbythermalgravimetricanalysisataheatingrateof10oc／minintheatomosphereofnitrogenandoxygen。respectively．Theresultsshowthatbothofthe“anaerobic”wastewatertreatmentandthesludgeanaerobicdigestionmaketheorganiccompoundsinsludgesocomplicatedthattheorganiccompoundsdecompositionandreleasetemperaturebecomeshigherduringpyrolyzing．andthe“aerobic+anaerobic’’processmakestheorganiccompoundsinsludgemorecomplicatedthanthe“anaerobic+aerobic”process．Thereisnoinfluenceonthecombustionprocessandtheburnoutpoint，butcanmakethecombustiontemperatureofsludgehigher．ThethermalreactionmechanismshavebeenstudiedwithSatava·焉estakequation．Itshowsthatthepyrolysismechanismofthesesludgesisaprocessofvolatilediffusionatfirstandthenthechemicalreactionfunction，whilethecombustionmechanismofthemisaprocessofchemicalreactionanddiffusionfunction．Keywords：sewagesludge；pyrolysis；combustion；wastewatertreatmentprocesses；anaerobicdigestionCLCnumber：0643．2Documentcode：ADuetotheadvantagesoftreatmentcompletely，largestreductioninvolume，littlesecondaryenvironmentalpollutionandeffectiveutilizationofenergythanothertreatmentmethods【。“．thermaltreatments(i．e：pyrolysis，combustion)ofsewagesludgearebecomingattractiverecently．andthermaltreatmentbehaviorsofsewagesludgebyTGandDTGhavebeencarriedoutwidelyL5。驯．However．thestudies8reallfocusedonthethermaltreatmentpropertiesofsingleordifferentsludges．suchasCalvoetal【5Jstudiedthekineticsofpyrolysisandcombustionofsludge．Conesaeta1⋯andScottetal[4]studiedthedifferentenceofpyrolysisbehaviorsbetweendigestedandundigestedsludge．Thereislittleinformationabouttheeffectofwastewatertreatmentprocessesonthebehaviorsavailab