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2008,28(12)1074~1078ChinaEnvironmentalScienceA2O1,1,2*,1(1.,,1500902.,,100124)52L//(A2O),A2O.,,DO1.08mg/L,CODNH4+NTNPO43P86.8%97.5%86.5%95.5%,,SVI130.1mL/g265.8mL/g,,.DO2.16mg/L,,SVI200mL/g.15%,30d,SVI100mL/g,.,DO,A2O.DOX703.1A10006923(2008)12107405ActivatedsludgebulkingandcontrolinA2Oprocess.WUChang-yong1,PENGYong-zhen1,2*,PENGYi1(1.StateKeyLaboratoryofUrbanWaterResourceandEnvironment,SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China).ChinaEnvironmentalScience,2008,28(12)1074~1078AbstractA52Lpilot-scalebiologicalnutrientsremovalsystem,basedonanaerobic/anoxic/oxic(A2O)configuration,wasusedtoinvestigatethesludgebulkingandcontrolwhentreatingsyntheticwastewater.GoodbiologicalnutrientsremovalperformancecouldbeachievedwhentheaverageDOwas1.08mg/LintheoxiczoneandtheremovalefficiencyofCODNH4+NTNandPO43Pwere86.8%,97.5%,86.5%and95.5%,respectively.ButsludgesettlecharacteristicsdeterioratedduringthisperiodandSVIincreasedfrom130.1mL/gto265.8mL/g,causingseveresludgebulking.WhenaverageDOconcentrationinoxiczonefromincreased1.08mg/Lto2.16mg/L,thesludgesettlecharacteristicswasimprovedbuttheSVIwasstillaround200mL/g.Tofurthercontrolsludgebulking,abypassflow(15%ofinfluentflowrate)wasinducedtothebeginningofoxiczone.ThesludgebulkingwascontrolledandtheSVIwasabout100mL/gafter30daysoperation.LoworganicloadingratherthanDOconcentrationintheoxiczonewasthemajorfactorforsludgebulkingandtheappropriatedistributionoforganicloadingalongthetankwasthebestwaytocontrolsludgebulkinginA2Oprocess.KeywordswastewatertreatmentsludgebulkingorganicloadingDOrawwastewaterbypassflow,50%[1].,95%[23].,DO(F/M),[4],,SBR,.,(BNR),[45].20080422863(2006AA06Z319);(50778005)*,,pyz@bjut.edu.cn12A2O1075,[6].BNR,,[4];[7]..,A2O,,A2O.11.1A2O1.,.52L,9,2,2,5.1:1:2.,,.21~22.26L..:140L/d,HRT9h,SRT15d,MLSS3546mg/L(2),55%,250%.,A/O,.15d,.1212123451A2OFig.1TheschematicdiagramofA2Oprocess1.2,:3~3.6mL/L,NH4Cl0.1~0.2g/L,KH2PO40.04~0.05g/L,NaHCO30.2~0.3g/L,NaOH0.15g/L,MgSO4·7H2O0.06g/L,CaCl2·2H2O0.015g/L.1.,Saito[8].1mL/L.1Table1WaterqualityofsyntheticwastewaterpHCOD(mg/L)NH4+N(mg/L)TN(mg/L)PO43P(mg/L)(CaCO3,mg/L)6.63~7.47142.90~499.3023.77~53.1223.94~54.585.34~15.78210~2307.01353.3040.0340.7610.26223.30107628CODNH4+NNO3NNO2NTNPO43PMLSS,.ORPWTWInoLablevel2,pHDOWTW340i.22.175dSVIMLSS2.3,,CODNH4+NTNPO43P86.8%97.5%86.5%95.5%.I30d,[9],SVI265.8mL/g,,0.2m3/h,DO1.08mg/L.II17d,SVI,SVI197.5mL/g,.0.3m3/h,DO2.16mg/L.III,,15%,II,30d,,SVI100mL/g,.50100150200250300010203040506070(d)SVI(mL/g)0500100015002000250030003500400045005000MLSS(mg/L)IIIIII2SVIMLSSFig.2ChangesofSVIandMLSSduringsteadystateMLSSSVI2.2,:pH[10];DO[1115];(F/M)[16];[17].1,,,.2.2.1pHpH6~9.pH,pH[10].1d,,,pH.NaHCO3NaOH,pH,pH7.47,6.63,7.01,pH,.2.2.2DO[1113],DO.[1415].,µmaxKs,DO,,DO,,.I~III0.2,0.3,0.3m3/h.DODO,30s,,DO.310minDO.3,IDO,30.5mg/L,4DO1.5mg/L,,,DO3.5mg/L,,51SBR,SBR[17],.3DO.I12A2O1077DO,,,.4I,4,,.00.51.01.52.02.53.03.54.04.5DO(mg/L)123453DOFig.3DOconcentrationsofdifferentrunsintheaerobicphasesIIIIII4I(×5000)Fig.4SludgeSEMofrunningstageI(×5000)II,DO:11.25mg/L54.25mg/L.,.2,II,SVI,17d,SVI200mL/g.DO,,DO.IIIDOIII,15%,,IIDOII.2,30d,.,DO,,DO,.2.2.3.,,,[18].COD0.28kg/(kg⋅d),.,.,,COD85%12%3%,,,.,,:PHA,.I,DO,,,.II,DO,,DO,DO,,,M.parvicella[19],SVI200mL/g,.III,15%,COD(2),COD75%,16%,107828.II,,(),30d,,.33.10.2m3/h,DO,,SVI265.8mL/g.3.20.3m3/h,,SVI200mL/g,,,.3.30.3m3/h,15%,,,,SVI100mL/g,.BNR,DO.[1]KristensenGH,JorgensenPE,NielsenPH.SettingcharacteristicsofactivatedsludgeinDanishtreatmentplantswithbiologicalnutrientsremoval[J].WaterScienceandTechnology,1994,29(7):157165.[2],,,.SBR[J].,2000,20(2):129133.[3],,.[J].,2006,7(5):19.[4]MartinsAMP,PagillaK,HeijnenJJ,etal.Filamentousbulkingsludge-acriticalreview[J].WaterResearch,2004,38(4):793817.[5]AntonioMartinsMP,HeijnenJJ,vanLoosdrechtMCM.Bulkingsludgeinbiologicalnutrientremovalsystems[J].BiotechnologyBioengineering,2004,86(2):125135.[6]KrhutkovaO,RuzickovaI,WannerJ.MicrobialevaluationofactivatedsludgeandfilamentouspopulationateightCzechnutrientremovalactivatedsludgeplantsduringyear2000[J].WaterScienceandTechnology,2002,46(1/2):471478.[7]EkamaGA,WentzelMC,CaseyTG,etal.Filamentousorganismbulkinginnutrientremovalactivatedsludgesystems[J].WaterSA,1996,22:147152.[8]SaitoT,BrdjanovicD,vanLoosdrechtMCM.Effectofnitriteonphosphateuptakebyphosphateaccumulatingorganisms[J].WaterResearch,2004,38(17):37603768.[9]KruitJ,HulsbeekJ,VisserA.Bulkingsludgesolved?[J].WaterScienceandTechnology,2002,46(1/2):457464.[10],,,.[J].,1999,32(5):5255.[11]MinoT.SurveyonfilamentousmicroorganismsinactivatedsludgeprocessesinBangkok,Thailand[J].WaterScienceandTechnology,1995,31(9):193202.[12]KappelerJ,GujerW.Developmentofamathematicalmodelforaerobicbulking[J].WaterResearch,1994,28(2):303310.[13]MartinsAMP,VanLoosdrechtMCM,HeijnenJJ.Effectoffeedingpatternandstorageonthesludgesettleabilityunderaerobicconditions[J].WaterResearch,2003,37(11):25552570.[14]Marti