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1、MicrowavedestructionoftrichloroethyleneinaH2O-O2-ArplasmaYoungsamKo1,GoSuYang1,DanielP.Y.Chang2andIanM.Kennedy31DepartmentofMechanicalEngineering,ChonbukNationalUniversity,Korea2DepartmentofCivilandEnvironmentalEngineering,3DepartmentofMechanicalandAeronauticalEngineering,UniversityofCaliforniaDavi
2、sSupportedbyCaliforniaARBBackgroundAsof1997,solventusageincreasedtoroughlyto6.5X106tpyToxicaircontaminants(TAC)mayproducetoxicby-productswhileundergoingcaptureandtreatment.Chlorinatedsolvents,chlorofluorocarbonsandsulfurhexafluoridefallintosuchacategorybecauseoftheirhigheractivationenergiesandlowbi
3、odegradabilityunderoxidativeconditionsAnincreaseofabout67%(16X106)tpyhasoccurredintheemissionsofHCFCs,PFCs,andSF6duringthedecadeofthe1990'sAlthoughincreasesinemissionshaveoccurred,concentrationsofemittedstreamsmayactuallybedecreasingbecauseofimprovedproductionmethodsorcaptureofthesepollutantsUCDavi
4、sBackgroundControlcostsgenerallyincreaseasconcentrationsdecrease,e.g.,thecostofcatalyticincinerationofVOCsincreasesfromabout$5,000/tonto$50,000/tonforacompoundsuchasbenzeneasitsconcentrationdropsfrom100ppmvto10ppmControlcostsforNOxrangefromroughlylessthanabout$1000/tonforadvancedburnertechnologiest
5、oover$5,000/tonforexhaustgastreatmentsDevelopmentofefficientcontrolstrategiesforlowconcentrationsofthesecompoundswhileavoidingNOxformationishighlydesirableAdsorptionisanefficientandeconomicalmethodformoderatetolowconcentrationstreams.Nevertheless,adsorbates(suchasVOCs)mustberemovedperiodicallyafter
6、theysaturatetheadsorbents(e.g.,activatedcarbonorzeolites)andrequirefurthertreatmentUCDavisSorbentregenerationConventionalregenerationmethods:steamandhotgas-firstneedssteamsource,leaveswetbed;secondrequireshighflowrates,largeenergydemandtoheatwholesystemMicrowaveregenerationutilizes"dielectricheatin
7、g"whicheliminatesmanyoftheabovedrawbacksUCDavisAdvantagesofmicrowaveprocessingofVOC‘sProductionofhighionizationlevelsandmoleculardissociationwithoutexcessheatingofthecontainedgasConstructionofreactionvessel
