chapter 1 introduction to anaerobic digestion：1章介绍了厌氧消化

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1、126EnhancingSolidsDestructionfromAnaerobicMunicipalDigestersByFaridKadeAThesissubmittedtotheFacultyoftheGraduateSchool,MarquetteUniversity,inPartialFulfillmentoftheRequirementsfortheDegreeofMasterofScienceinCivilandEnvironmentalEngineeringMilwaukee,WisconsinJul

2、y,2004126ABSTRACTThepurposeofthisstudywastocomparetemperaturephasedandtemperaturestagedanaerobicdigestiontoconventionalmesophilicanaerobicdigestionintermsofsolidsdestruction,biomassactivity,andpathogeninactivation.Previousstudieshaveestablishedthattemperatureph

3、asedanaerobicdigestion(TPAD)mayproducemoremethane,destroyvolatilesolids,andinactivatepathogenicmicroorganismsmorecompletelythancomparableconventionalmesophilicdigestion.Alsopreviousstudiesshowedthatbatch-stagedtemperatureanaerobicdigestion(B-STAD)andanaerobicdi

4、gestionelutriatedphasedtreatment(ADEPT)canproducelowervolatilefattyacids(VFA)concentrationsintheeffluent.ThestudyreportedhereinalsoprovidesinformationonnutrientadditioneffectsoneffluentVFAconcentrationsandbiomassactivity.Theconventionalmesophilic,TPAD,B-STAD,an

5、dADEPTpilotdigestersoperatedforthisstudywereeachfedonceadayand,therefore,receivedadailyslugdoseoffeed.Thishadtheadvantageofholdingallparticlesofsludgefor24hoursat55oC.However,thedailyslugfeedingtypicallyresultedinelevatedvolatilefattyacidconcentrations,especial

6、lyinthethermophilicdigester.Eachsystemhadatotalactivevolumeof24litersandwasoperatedata15dayhydraulicretentiontime(HRT).Thesingle-phaseconventionalanaerobicdigestionsystemwasoperatedundermesophilicconditions.TheTPADsystemconsistedofan8-literthermophilicreactorfo

7、llowedbya16-litermesophilicreactor.TheB-STADsystemconsistedofthesamereactorsusedintheTPAD126systembutconfiguredtorecycleeffluentfromthemesophilicreactortothethermophilicreactor.TheADEPTsystemconsistedofa16-literthermophilicreactorfollowedbyan8-litermesophilicre

8、actor.ReactorsusedintheADEPTsystemwerenotmixed.Eachsystemwasfedamunicipalsludgeblendof70%primarysludgeand30%wasteactivatedsludgefromtheCityofJanesvilleWastewaterTreatmentPla