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SBR1,2,2,2(1.,101102;2.,710055):SBR,/,1h3h;/,,1h;,,;,6h,10h,,:SBR;;;;;:X703.1:C:1000-4602(2008)07-0104-05StudyonInfluencingFactorsofSludgeSettleabilityinSBRLIUYan1,ZHANGLi2qing2,XINGJia2shen2,WANGZhi2ying2(1.BeijingSoundEnvironmentalEngineeringCo.Ltd.,Beijing101102,China;2.SchoolofEnvironmentalandMunicipalEngineering,XianUniversityofArchitectureandTechnology,Xian710055,China)Abstract:Theinfluenceofoperationmode,operationtime,nitrateconcentration,aerationrate,sludgeloadandaerationtimeonsludgesettleabilitywasinvestigatedinsequencingbatchreactor(SBR).Theexperimentalresultsdemonstratethatgoodsludgesettleabilitycanbeobtainedasrunninginanaero2bic/aerobicmodewithmorethan1hofanaerobicstageandmorethan3hofaerobicstage.Asrunninginanoxic/aerobicmode,thesludgebulkingcanberesultedfromexcessivenitrateconcentrationinanoxicstage.Thetimeofanoxicstageshouldbecontrolledatabout1h.Undertheconditionofhighorganicload,thesludgebulkingcanbecausedbyhigherorloweraerationrate,andthesludgesettleabilitycanbeimprovedeffectivelybyreducingthesludgeload.Undertheconditionoflowsludgeload,suitableaer2ationrateandsufficientnutrientconcentration,thesludgesettleabilityispoorerby6haerationtime,nevertheless,thesludgeconcentrationisstableandthesettleabilityisbetterwhentheaerationtimeisprolongedto10h.Keywords:SBR;operationmode;anaerobictreatment;anoxictreatment;aerobictreat2ment;settleability:(50178059)40124720084CHINAWATER&WASTEWATERVol.24No.7Apr.2008SBR,//,,,,,,,SBR,SBR1111111115.0LSBR,(),6h,25([1]);,200300mL/min11112,300mg/L,15mg/LNH4Cl,3mg/LKH2PO4,3g/L//,(2h)/(3h)(1h)/(4h)(0.5h)/(4.5h);(2h)/(3h)(1h)/(4h)(0.5h)/(4.5h)1121121130.8LSBR,1#3#,25,3mg/L,12h16h11212,BOD5NP=10051([2])11Tab.1Designofoperationparameters/(kgCODkg-1MLSSd-1)/(mLmin-1)1#0.8300400300400mL/min150200mL/min6h/5.5h/0.5h2#0.81502000.8kgCOD/(kgMLSSd)0.5kg2COD/(kgMLSSd)6h/5.5h/0.5h3#0.32003006h10h6h10h/5.5h/0.5h113COD:;NH+4-N:;NO-2-N:N-(1-)-;NO-3-N:;Eikelboom[3]2211/SBR,(2h)/(3h)(1h)/(4h)(0.5h)/(4.5h),,11SVIFig.1VariationofSVIindifferentoperationmodes1,(2h)/(3h)(1h)/(4h),SVI150mL/g,,,501:SBR247(0.5h)/(4.5h),SVI/,:2h,;3.04.0h,,[4]1h3h,,;(0.5h)/(4.5h),,,SVI212/21211,20%65%,[5],/,,(1h)/(4h)(2h)/(3h)(0.5h)/(4.5h),10mg/L50mg/L,,232(1h)/(4h)SVIFig.2VariationofSVIwithnitratenitrogenconcentrationinanoxic(1h)/aerobic(4h)modes2,1h,30mg/L,50mg/L,SVI3,(2h)/(3h)(0.5h)/(4.5h),10mg/LSVI400mL/g,,3(2h)/(3h)SVIFig.3VariationofSVIwithnitratenitrogenconcentrationinanoxic(2h)/aerobic(3h)modesCOD,(2h)/(3h),1hCOD50mg/L;(1h)/(4h),COD50100mg/L,COD,,1h,,(2h)/(3h),2h,,1h,,,,(3)(1h)/(4h),,1h,,;,,;COD50mg/L,,(2)(0.5h)/(4.5h),,,,601247(1h)/(4h),4(,mg/L)4A(1h)30/O(4h)A(1h)50/O(4h)Fig.4VariationofnitratenitrogeninacycleofA(1h)30/O(4h)andA(1h)50/O(4h)4,50mg/L,,;,,,,SVI,213,,,,,,Palm,DO[6][0.750.9kgCOD/(kgMLSSd)],1#0.8kgCOD/(kgMLSSd),300400mL/min,12150200mL/min,SVI55,,SVI,7250mL/g,,1851;,,SVI300mL/g,Eikelboom17015SVIFig.5EffectofaerationrateonSVIathighsludgeload,SBR,,[79],,(Ks),;,[10],,,,2#150200mL/min,0.8kgCOD/(kgMLSSd),60.5kgCOD/(kgMLSSd),66Fig.6Recoveryofsludgebulkingathighsludgeloadbydecreasingsludgeload6dEikel2701:SBR247boom1701,6,SVI,10,SVI150mL/g,,,,,,214,,,,;,,,,,3#,6h10h,77Fig.7Effectofaerationtimeonsludgesettleability7,,,,SVI,150mL/g,,:,,,,,;,,,3SBR/,1h3h;/,,1h,,,,6h;10h,,:[1],,,.SBR[J].,2005,25(1):105-108.[2],,.[J].,2001,21():137-142.[3]EikelboomDH.Filamentousorganismobservedinacti2vatedsludge[J].WaterRes,1975,9(6):148-156.[4],.SBR[J].,2006,7(2):116-120.[5].A/O[J].,1999,15(12):45-46.[6]PalmJC,JenkinsD,ParkerDS.Relationshipbetweenorganicloading,dissolvedoxygenconcentrationandsludgeprocess[J].JWPCF,1980,52(10):2484-2506.[7]ChudobaJ,BlahaJ,OttovaV.Controlofactivatedsludgefilamentousbulking-.Effectofsludgeloading[J].WaterEnvironRes,1974,(8):231-237.[8],,,.SBR[J].,1999,15(6):11-13.[9],.[J].,2001,17(3):66-69.[10],,,.[J].,2006,(12):33-35.:13520133864E-mail:ly_donna@sohu.com:2007-11-18801247