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DO,,,,(,710055):(SBR),;NH+4-N300mg/LCOD400600mg/L,80%:;;;:X703.1:A:1000-4602(2004)05-0013-04Short-cutNitrificationandSimultaneousNitrificationandDenitrificationinSBRatLowDOZHANGXiao2ling,LIBin,YANGYong2zhe,WANGLei,WANGZhi2ying(SchoolofEnvironmentalandMunicipalEngineering,XianUniversityofArchitectureandTech2nology,Xian710055,China)Abstract:Studywasmadeonthecharacteristicsandcontrolconditionofshort-cutnitrificationinSBRatlowDO,andtheeffectofcarbonsourceconcentrationanddosingmodeonefficiencyofsi2multaneousdenitrification.TheresultsshowedthattomaintainenvironmentinwhichhighandlowDOoccuralternatelyisthekeytoachievingshort-cutnitrification.WhenNH+4-Nis300mg/LandCOD400600mg/Lininfluent,useofsemi-continuousdosingofcarbonsourcecanguaranteesi2multaneousdenitrificationefficiencyupto80%.Keywords:SBR;short-cutnitrification;simultaneousnitrificationanddenitrification;lowDO:(50178059)11111SBR5L(4L),,(5min)112,:NH4HCO3NaHCO3CH3COONa3H2OKH2PO4,NH+4-N300mg/L,COD400600mg/L,PO3-4-P3mg/L;113:;:N-1-;:;COD:;312004Vol.20CHINAWATER&WASTEWATERNo.512211,2832,50100mg/L,5mg/L100mg/L200mg/L,,10d,,5mg/L,0.62kg/(m3d),98%,212SBRSBR6h,5min295min30min15min15min,(7080L/h)22SBR2,(150mg/L)(5180min),(180240min),(240300min),Monod,15mg/L,,;15mg/L,,,,DODOpH33SBRDOpH23:,,DO;15mg/L,,,DO,(6mg/L),pHNaHCO3,20minpH,pHpH,H+H+(CO2),CO2,pH20min,pH,213DO7080L/h,SBR(3),;5060L/h,(00.2mg/L),;()4545,SBR,5mg/L,73%90%,412004Vol.20No.5;SBR,8,80140mg/L(12d),50%,10mg/L5mg/L,;SBR,4d45,3DO,,DO,DO,[1],,,DO,1060120min,,11,,,,,,NO-2NO-3,,,30min1DO(min)1060120[kgN/(kgMLSSd)]0.1530.2280.311[kgN/(kgMLSSd)]0.00830.01130.0198(mg/L)125.913097.76(mg/L)48.518.45DO,[2],(PHB),,PHB,,[3],();SBR(),,,,1031,SBR,214,(),,,,,512004Vol.20No.5COD:();;()2(300mg/L)2CODCOD(mg/L)COD(%)COD(%)40054.2595.4160060.3895.8256469.6696.3389768.9796.7140880.0894.1560280.996.242,COD,COD,COD,,50%60%;70%,COD,,,;,80%2CODCODCOD(,1gNO-2-N1.71gCOD),COD5.71%9.26%18.56%10.85%37.82%26.33%COD,,,COD,,215DO,,(160mL/g5060mL/g)(55),:200m,543m,,32125300mg/L7080L/hSBR,90%,,NH+4-N300mg/LCOD400600mg/L,80%:[1]LaanbroekHJ.Competitionforlimitingamountsofoxy2genbetweennitrosomonaseuropaeaandnitrobacteriawinogradskyigrownincontinuouscultured[J].ArchMi2crobiology,1993,159:453-459.[2]CartaF,BeunJJ,VanLoosdrechtMCM,etal.Simul2taneousstorageanddegradationofPHBandglycogeninactivatedsludgecultures[J].WaterResearch,2001,35(11):2693-2701.[3],Nicolasbernet.[J].,1999,17(6):10-14.:(1976-),,,,:13152173991:2003-12-18::612004Vol.20No.5