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32DOSBBR11211.5100062.100022SBBR。DOSBBRDO2.8～4.0mg/L67％。SBBR。SBBRDO。DODO。SBBRDOX703.1A1003-6504(2009)10-0016-04EffectofDOonSimultaneousNitrificationandDenitrificationinSequencingBatchBiofilmReactorRONGHong-wei1,ZHANGChao-sheng1,PENGYong-zhen2,ZHANGKe-fang1(1.SchoolofCivilEngineering,GuangzhouUniversity,Guangzhou510006,China;2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022,China)AbstractSequencingbatchbiofilmreactor(SBBR)wastestedforsimultaneousnitrificationanddenitrification(SND)formunicipalwastewater.Resultsshowedthatthedissolvedoxygen(DO)presentinSBBRwasanimportantfactorinachievingahigherdegreeofSND,withTNremovalefficiencyabove67%atDOof2.8~4.0mg/L.ThemechanismofSNDinSBBRwasanalyzedonthebasisofDOdiffusionmodelwithinbiofilmandobservationofscanningelectronmicroscopy.ItwasfoundthatSNDinSBBRwascausedbyanoxicmicroenvironmentwhichexistedinthebiofilmunderaerobicconditions.DOconcentrationdirectlyaffectedtheproportionofaerobicfractionandanoxiafractioninthebiofilm,whichledtoaneffectonefficiencyofnitrificationanddenitrification.WithincreaseofDOconcentration,thespeedtransferefficiencyofoxygenwasenhancedtomakemicroenvironmentconvertfromanoxiaenvironmenttoaerobicenvironment.MicroenvironmentinclinedtoconvertfromaerobicenvironmenttoanoxiaoranaerobicenvironmentwithdecreaseofDOconcentration.Keywordssequencingbatchbiofilmreactor(SBBR);simultaneousnitrificationanddenitrification(SND);dissolvedoxygen(DO);microenvironment。。(SimultaneousNitrificationandDenitrificationSND)。、、、SBR、CAST[1-4]。(SND)、、。SBBRDOSBBR2008-09-082008－11－1850878058“”2006BAC19B032004B333010061973-020-39366657rhwcn@126.com。EnvironmentalScience&Technology32820098Vol.32No.8Aug.20098。11.11。15cm120cm17L。150mm1236m2/m399％1260mm。1.2、、、、、1。1.3CODN-(1-)-DO、pHWTW。。22.1DOSBBR5.0h20min10min5.5h。、。25℃DO1.3mg/L、1.8mg/L、2.8mg/L、3.5mg/L、4.0mg/L、4.55.0mg/LDO2。DOSBBRCODTNTPNH3-NNO3--NNO2--NpH229.2~267.529.17～35.292.19～5.4226.23～33.890.26～1.950.02～0.836.78～7.841Tabble1RawwaterqualitypHmg/LDOCODNH3-NNO2--NNO3--NTN%%%1.3232.345.480.4529.6118.6037.180.160.110.751.5731.8521.8231.491.8247.530.187.8430.0213.1856.090.270.761.032.6232.7817.7345.912.8229.620.591.0831.684.6485.350.161.150.574.9334.7511.467.173.5258.421.691.6430.020.5198.30.290.760.846.2633.647.7377.024.0230.118.691.9228.720.2299.230.321.250.918.4733.5910.1269.874.5260.319.492.5532.120.4798.490.120.561.1612.0935.1714.8357.835.0237.817.992.4829.740.3198.960.160.110.751.5732.4119.5239.772DOCOD、NH3-N、NO2-N、NO3-NTNTable2VariationofCOD、NH3-N、NO2-N、NO3-NandTNatdifferentDOconcentrationmg/L2DOCODDO1.8mg/LCOD87％30mg/L。DONH3-NTN。DO1.8mg/LNH3-N＜60％TNNH3-NTN＜50%。DO。DONO2--NNO3--NN2。DO2.8mg/L～4.0mg/LTN67.17%～77.02%65%NH3-NDO85％。DO32。DO4.5mg/LNH3-N99％。TNDO5.0mg/L39.77%TNNO3--N。DONO3--N。DODODO。DO2.8～4.0mg/L。2.25hDO2.8mg/LDO2.0mg/L。DO。12。。2。1[5]C=CoexpKD姨δ-L+x姨姨-expKD姨L-δ-x姨姨expKD姨δ-exp-KD姨δ1CxDOmg/LDDOm2/sC0DOmg/LxmLmδmK。。、。。。DODO。2.3。34。。。5。8DO＜1.8mg/LδTN。DO2.8mg/L～4.0mg/LDOδ。DO4.5mg/LDOδTN。31DO2.8～4.0mg/L85％65％。2SBBR。3DODO。[][1]OskarModinKensukeFukushiKazuoYamamoto.Denitri-ficationwithmethaneasexternalcarbonsource[J].WaterResearch200741(6)2726-2738.[2]ABGupta,SKGupta.SimultaneouscarbonandnitrogenremovalfromhighstrengthdomesticwastewaterinanaerobicRBCbiofilm[J].WaterResearch200135(5)1714-1722.[3]GaoShou-youPengYong-zhenWangShu-ying,etal.NovelstrategyofnitrogenremovalfromdomesticwastewaterusingpilotOrbaloxidationditch[J].JournalofEnvironmentalSciences20061(9/10)833-839.[4]WangXJXiaSQChenLetal.Nutrientsremovalfrommunicipalwastewaterbychemicalprecipitationinamovingbedbiofilmreactor[J].ProcessBiochemistry200641(4)824-828.[5],.SBBR[J].200824572-76.RongHong-wei,PengYong-zhen,ZhangChao-sheng,etal.Effectofaerationrateonbiologicalphosphorusremovalusingsequencingbatchbiofilmreactor(SBBR)[J].ChinaWaterandWastewater,2008,24(5):72-76.(inChinese)DOSBBR