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1、BiochemistryofenhancedbiologicalphosphorusWaterScience&TechnologyremovalandanaerobicCODstabilizationZ.K.Erdal*?,U.G.Erdal*andC.W.Randall***CH2MHILL,3HuttonCentreDrive,Suite200,SantaAna,CA92707,USA**CivilandEnvironmentalEngineeringDepartment,VirginiaTech,Blacksburg,VA24060,USACorrespondingA
2、uthorAbstractImproveddesignstrategiesatBNRplantsshouldincludecostreductionssothattheconsumersVol52No10–11pp557–567andwaterauthoritieswillbemorewillingtobuildEBPRplantsinsteadofconventionalactivatedsludgeplants.Throughef?cientdesign,actualsavingsinconstructionandoperationcostscanberealized.
3、Forthisreason,anaerobicstabilizationofCODneedstobeseriouslyconsideredduringdesignfordirectenergysavingsattheplants.Theexistenceofanaerobicstabilizationhasbeendemonstratedthroughexperimentalwork.Evaluationofoperationaldatafromexistingplantshasalsoindicatedthede?nitepresenceofanaerobicstabil
4、izationatplantsthatincludeanaerobiczonesforEBPRaspartoftheiroperation.ByexploringthebiochemicalreactionstakingplaceinEBPRprocess,particularlytheinvolvementofthestoragemechanismsforPHA,poly-Pandglycogenstorage,thepotentialmechanismsoftheanaerobicstabilizationofCODinEBPRsystemswasexplored.Th
5、eresultantbalancespointedouttheimportanceofQglycogenmetabolismintermsofconservingcarbonandprovidingasinkforthereducingequivalentsIWAPublishing2005producedunderaerobicconditions.Thismechanismisdifferentfromthoseobservedinanoxic-aerobicandconventionalaerobicactivatedsludgesystems,andappearst
6、obeatleastpartiallyresponsiblefortheobservedanaerobicstabilizationofCOD.KeywordsEnhancedbiologicalphosphorusremoval;CODloss;anaerobicstabilization;EBPRmetabolism;biochemicalmetabolism;glycogen;polyhydroxyalkanoatesIntroductionTheconceptofanaerobicstabilization(i.e.CODlossinsystemmassbalanc
7、eswhichcan-notbeaccountedfor)was?rstreportedbyLanetal.(1983)basedontheobservedreductioninoxygenrequirementsinalaboratoryscalebiologicalphosphorusremoval(BPR)systemconsistingofanaerobicandaerobiczones,operatedwithnitri?cationinhi-bition.Theoxygendemandintheaero
