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FK;JJ݌ ( (#(# Ќ  eF &  OtherConsiderations:  ~  '~LForgasabsorption,thewaterorothersolventmustbetreatedtoremovethecapturedpollutantfromthesolution.Theeffluentfromthecolumnmayberecycledintothesystemandusedagain.Thisisusuallythecaseifthesolventiscostly(e.g.,hydrocarbonoils,causticsolutions,amphiphilicblockcopolymer).Initially,therecyclestreammaygotoatreatmentsystemtoremovethepollutantsorthereactionproduct.Makeupsolventmaythenbeaddedbeforetheliquidstreamreentersthecolumn(EPA,1996a).ForPMapplications,wetscrubbersgeneratewasteintheformofaslurry.Thiscreatestheneedforbothwastewatertreatmentandsolidwastedisposal.Initially,theslurryistreatedtoseparatethesolidwastefromthewater.Thetreatedwatercanthenbereusedordischarged.Oncethewaterisremoved,theremainingwastewillbeintheformofasolidorsludge.Ifthesolidwasteisinertandnontoxic,itcangenerallybelandfilled.Hazardouswasteswillhavemorestringentproceduresfordisposal.Insomecases,thesolidwastemayhavevalueandcanbesoldorrecycled(EPA,1998).Configuringacontroldevicethatoptimizescontrolofmorethanonepollutantoftendoesnotachievethehighestcontrolpossibleforanyofthepollutantscontrolledalone.Forthisreason,wastegasflowswhichcontainmultiplepollutants(e.g.,PMandSO2,orPMandinorganicgases)aregenerallycontrolledwithmultiplecontrol +{ devices,occasionallymorethanonetypeofwetscrubber(EC/R,1996).Z: References:  " Avallone,1996. MarksStandardHandbookforMechanicalEngineers,editedbyEugeneAvalloneandTheodoreBaumeister,10thEdition,McGrawHill,NewYork,NY,1996. Y"% AWMA,1992.Air&WasteManagementAssociation,AirPollutionEngineeringManual,VanNostrand $c' Reinhold,NewYork.CrollReynolds,1999.CrollReynoldsCompany,Inc.,websitehttp://www.croll.com,accessedMay19,1999.EC/R,1996.EC/R,Inc., EvaluationofFineParticulateMatterControlTechnology:FinalDraft,preparedforU.S.EPA,IntegratedPolicyandStrategiesGroup,Durham,NC,September,1996.EPA,1981.U.S.EPA,OfficeofAirQualityPlanningandStandards, ControlTechnologiesforSulfurOxideEmissionfromStationarySources,SecondEdition,ResearchTrianglePark,NC,April,1981.EPA,1982.U.S.EPA,OfficeofResearchandDevelopment, ControlTechniquesforParticulateEmissionsfromStationarySources!Volume1,EPA450/381005a,ResearchTrianglePark,NC,September,1982. L/*4 ЇEPA,1991.U.S.EPA,OfficeofResearchandDevelopment, ControlTechnologiesforHazardousAirPollutants,EPA/625/691/014,Washington,D.C.,June,1991.EPA,1992.U.S.EPA,OfficeofAirQualityPlanningandStandards, ControlTechnologiesforVolatileOrganicCompoundEmissionsfromStationarySources,EPA453/R92018,ResearchTrianglePark,NC,December,1992EPA,1993.U.S.EPA,OfficeofAirQualityPlanningandStandards, ChromiumEmissionsfromChromiumElectroplatingandChromicAcidAnodizingOperations!BackgroundInformationforProposedStandards,EPA453/R93030a,ResearchTrianglePark,NC,July1993.EPA,1995.U.S.EPA,OfficeofAirQualityPlanningandStandards, SurveyofControlTechnologiesforLowConcentrationOrganicVaporGasStreams,EPA456/R95003,ResearchTrianglePark,NC,May,1995.EPA,1996a.U.S.EPA,OfficeofAirQualityPlanningandStandards, OAQPSControlCostManual,FifthEdition,EPA453/B96001,ResearchTrianglePark,NCFebruary,1996.EPA,1996b.U.S.EPA,OfficeofAirQualityPlanningandStandards, ChemicalRecoveryCombustionSourcesatKraftandSodaPulpMills,EPA453/R96012,ResearchTrianglePark,NC,October,1996.EPA,1998.U.S.EPA,OfficeofAirQualityPlanningandStandards, StationarySourceControlTechniquesDocumentforFineParticulateMatter,EPA452/R97001,ResearchTrianglePark,NC,October,1998.