搜索
AO1,2,1,2＊,2,2,2,2(1., 150090;2., 100022):,AO.,AOSVI150～230mLg,.、,COD,86%63%,,70%,10%～25%.SS,3NTU.DO=0.5mgLDO=2.0mgL17%,57%.:;;;;AO:X703.1 :A :0250-3301(2008)12-3348-05:2007-12-13;:2008-01-25:(863)(2006AA06Z319);(50778005);(8062006);(EDBS071-53974092):(1981～),,,.＊,E-mail:pyz@bjut.edu.cnEnergySavingAchievedbyLimitedFilamentousBulkingUnderLowDissolvedOxygen:ExperimentalValidationinAOProcessGUOJian-hua1,WANGShu-ying2,PENGYong-zhen1,2,ZHENGYa-nan2,HUANGHui-jun2,GEShi-jian2,SUNZhi-Rong2(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China;2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentalRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022,China)Abstract:PreliminarystudieshadbeenconductedtodeterminethecorrectnessofthetheoryandtechniqueofenergysavingachievedbylimitedfilamentousbulkingunderlowDOusingalab-scaleAOreactorwithrealdomesticwastewaterastheinfluent.TheresultsshowedthatSVIcouldbemaintained150-230mLgandsludgesettleabilitywouldnotbecomeverypoorundertheconditionoflowDO.Duringtheperiodoflimitedfilamentousbulking,CODandtotalnitrogenremovalefficiencieswereimproved,anddistinctsimultaneousnitrificationanddenitrification(SND)wasachieved,whileammoniaremovalefficiencywouldslightlydeclinewithdecreasingofDO,comparedwiththeperiodofgoodsettleabilitysludgeunderhighDO.COD,ammoniaandtotalnitrogenremovalefficiencieswere86%,70%and63%,respectively.Itwasfoundthatabout10%-25%nitrogenwouldberemovedbySNDbasedonthemassbalanceofnitrogen.Besides,SSintheeffluentwasalmostnegligibleandtheeffluentturbiditywaslowerthan3NTU.Significantly,aerationconsumptionswouldbedecreasedby17%undertheconditionwithDOof0.5mgLcomparedwith2.0mgLaccordingtotheoreticalcalculationofairrequirementstokeepdifferentDOlevels,whichwasabout57%inlab-scalereactorcorrespondingly.Keywords:lowdissolvedoxygen;limitedfilamentousbulking;aerationconsumption;filamentousbacteria;predenitrificationprocess(AOprocess) ,、,,.“”,().[1],.,.AO,,.1 1.1 AO,1.66L,6,1∶5.20.5L,,.DO2912200812 ENVIRONMENTALSCIENCEVol.29,No.12Dec.,2008DOI:10.13227/j.hjkx.2008.12.035 1.;2.;3.;4.;5.;6.;7.;8.;9.;10.;11.;12.1 AOFig.1 SchematicdiagramoftheAOprocess.(MLSS)2500～3500mgL,25℃,150%,100%.1.2 ,,1.1.3 .COD、SV、MLSS,NH+4-NMetrohm 1 Table1 WastewatercharacteristicspHCODmg·L-1NH+4-Nmg·L-1NO-2-Nmg·L-1NO-3-Nmg·L-1TNmg·L-1mg·L-17.0～7.8160～32040～800.04～0.260.12～1.0850～100280～400(761),NO-2-N、NO-3-NMetrohm(861),(TN)multiNC3000(AnalytikJenaAG),WTWTurb55,DOWTW(Multi340i).OLYMPUS-BX52.2 2.1 DO,AO,.DO2.0mgL0.5mgLSVI,(2).1SVI150～230mLg.SVI80～120mLg[2],,SVI,AO.AO,DO,、,(3).,DO,,,20～500μm(4),3.,,.[3],,.,.,,,.2 DOSVIFig.2 EffectofreducingDOsharplyonSVI,、DO、pH.,,,.,COD0.2～0.35kg(kg·d),0.5～0.8mgL,SVI334912:AO 3 (:40,ph2)Fig.3 MorphologicalcharacteristicsofsludgeflocunderhighDO(400times,ph2)4 (:40,ph2)Fig.4 MorphologicalcharacteristicsofsludgeflocunderlowDO(400times,ph2)250mLg,.(0.20)(0.38),.,,,SVI.2.2 5DOCOD、NH+4-N、TNSS.DOCOD,DOCOD,,.DO,,DO2.50.5mgL96%70%.,DO0.5mgL,DO2.50.5mgL57%63%.DODO,DO.5 DOFig.5 PollutantsremovalefficienciesunderdifferentDOlevels6DO,DO2.5mgL,,,DO0.5mgL,.,,DO(3350 29 Inf、A1、O1…O5Eff、1、156 DOFig.6 TypicalvariationsofCOD,ammonia,nitriteandnitrateineveryzoneunderhighandlowDOconcentrations0.5mgL),21.6%(SND),DO=1.5mgL,DO,SND(7).,10%～25%.,,gd7 DOAOFig.7 NitrogenmassbalanceunderbothhighDOandlowDO,.SS150～350mgL,DO、,SS10mgL,.,,.SS5mgL,.,AODO(DO1.5mgL)DO(DO=0.5mgL).35～80NTU,,2NTU,96%,DO15NTU.,.2.3 ,DO.Q=10000m3d,BOD5Sa=150mgL,BOD5Se=15mgL,90%,MLVSS2000mgL,3000m3,4.5m.5.0、4.0、3.0、2.5、2.0、1.5、1.0、0.5、0.3mgL.:a′=0.5,b′=0.1,α=0.85,β=0.95,ρ=1,EA=10%.[4],.8,,DODO=2.0mgL.8,DO335112:AO5.0mgL3.0mgL,;DO2.5mgL0.5mgL,,,.2.0mgL,55135m3d;0.5mgL,45828m3d,17%,,.AO,.2.25℃,DO0.5mgL,0.3m3h,DO=2.0mgL0.8m3h,57%.,DODO., 8 DOFig.8 TheoreticalsupplyairamountsunderdifferentDO,、、、[5].2 DOTable2 VariationofairflowrateunderdifferentDO(25℃)DOmg·L-12.52.01.51.00.50.3m3·h-10.8±0.050.7±0.050.6±0.050.5±0.050.3±0.050.2±0.053 (1)AO,SVI150～230mLg.(2)、,COD,86%63%,,70%,10%～25%.SS,3NTU.(3)DO,DO=0.5mgLDO=2.0mgL17%;DO=0.5mgLDO=2.0mgL57%.(4),,SVI.:[1] ,,,.、[J].,2008,29(12):3342-3347.[2] JenkinsD,RichardMG,DaiggerGT.Manualonthecausesandcontrolofactivatedsludgebulkingandothersolidsseparationproblems[M].(3rdedition).London,UK:IWAPublishing,2004.1-7.[3] SezginM,JenkinsD,ParkerDS.Aunifiedtheoryoffilamentousactivatedsludgebulking[J].JWaterPollutControlFed,1978,50(2):362-381.[4] ,,.[M].().:,2006.148-150.[5] TchobanoglousG,BurtonFL,StenselHD.WastewaterEngineering:TreatmentandReuse[M].(4thedition).NewYork:McGraw-Hill,2003.425-430.3352 29