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,,,.UASB[J].,2005,25(2):176-179LIUYonghong,HEYanling,LIYaozhong,etal.ThesettlingcharacteristicsandterminalvelocityofgranularsludgeinUASBreactor[J].ActaScientiaeCircum2stantiae,2005,25(2):176-179UASB1,2,1,1,111,710049;21,710048:,UASB.,(1)(1Re100),,Allen;(2),.,.:UASB;;;;:025322468(2005)0220176204:X703:AThesettlingcharacteristicsandterminalvelocityofgranularsludgeinUASBreactorLIUYonghong1,2,HEYanling1,LIYaozhong1,YANGShucheng11.DepartmentofEnvironmentalScienceandEngineering,JiaotongUniversity,Xian,710049;2.DepartmentofEnvironmentalScienceandEngineering,XianEn2gineeringandTechnologyCollege,710049Abstract:Duetotheexcellentsettlingpropertiesofgranularsludge,UASBreactorsarewidelyusedinwastewatertreatment.ThesettlingcharacteristicsandterminalvelocityofgranularsludgeinUASBreactorswasdiscussedbyusingaterminalvelocitymodelontheviewofhydrodynamics.Theresultsshowedthat:(1)theset2tlingprocessofthemostgranularsludgewasinthecategoryofintermediateflowregime(1Re100)ratherthaninlaminarflowone,thesettlingvelocityofwhichwasinproportiontothegranulardiameterandinaccordancewithAllenformula;(2)theterminalsettlingvelocitywasmuchgreaterthanthatoftheliquidupflow,whichsuccessfullysolvedtheproblemofsludgewash-outunderhighorganicloadingrate(OLR).Thevalidityofthismodelwasverifiedbyusingtheoperatingpa2rametersofseveralanaerobicreactorsinthepractice.Furthermore,itcouldbeatheoreticaltheoryapplingasausefultoolforthedesignandtheoperationofthehigh-rateanaerobicreactorsKeywords:UASBreactor;granularsludge;hydraulics;intermediateflowregime;terminalvelocitymodel:2004202223;:2004208216:863(2002AA601190):(1968),,(),liuyhxa@sina.com.cn()[1,2].(SRT)(HRT),,,,.,[3].Stokes[46],Allen[7].,,(Stokes)(Allen),.1UASB(upflowanaerobicsludgeblanket),,U,,.,,.,:,()dp,25220052ACTASCIENTIAECIRCUMSTANTIAEVol.25,No.2Feb.,2005p;,,;()().:Fb=6d3pg(1)Fd=d2p4u22(2)Fg=6d3ppg(3),Fb,Fg,Fd,u;g;(dragco2efficient).,,.,,.,ut(ter2minalvelocity).,Fg-FbFd=6d3ppdud(4)(1)(2)(3)(4),dud=p-pg-34dppu2(5)dud=0,(5)ut=4gdp(p-)3(6),:ua=ut-U(7)2211ua0utU,,.212(6),,.,=(Re)=(dsutP)(8)(intermediateflowregime),1Re500,[8]:=1815Re-016(9):ut=0.781[d1.6(s-)P0.40.6]0.714(10),:Re=dsutP(11)213,UASB0152mh-1,EGSB(Expandedgranularsludgeblanket)26mh-1,IC(internalcircu2lationreactor)210mh-1.10301080kgm-301145mm[9]..1030,1040,1050,1060,1070,1080kgm-3,,013215mm[10].10-3Pas,1000kgm-3.12.1Fig.1TerminalSettlingvelocityofvarioussludgegranules1,10301080kgm-3013mm10mh-1,.,,.,,7712:UASB().,,[11]:(1).,.(2),.(3),,,.1,,SRT;,.,.2,0132mm1100;2mm160..2Fig.2Reynoldsnumberofsludgegranulesindifferetdensity214,(1),3.10-3Pas.3(a),.,.,,,.15[12]Table1ActualterminalvelocityoffivetypesofsludgegranulesPmmP(kgm-3)P(mh-1)(Nedalco,BergenopZoom,TheNetherlands)11510395219(CentralSuikerMaatschappij,Breda,TheNether2lands)118910388313(Aviko,Steender2en,TheNetherlands)117610579718(PapierfabrickRoermond,TheNetherlands)212010429819(SuikerUnie,Roosendaal,TheNetherlands)0180108253163Fig.3Comparisonbetweencalculationresultsandactualvalue3(b)(1070),.3(1),;.(2),87125.UASBEGSBIC.(3),.,.:[1]LettingaG,FieldJ,etal1Advancedanaerobicwastewatertreatmentinthenearfuture[J].WatSciTech,1997,35(10):512[2]SchmidtJE,AhringBK.GranularsludgeFormationinupflowanaerobicsludgeblanket(UASB)reactors[J].BiotechnologyandBioengineering,1996,49:229246[3]HedgesPeterD,BeckerFionaA,SmissonRobertPM.Theapplica2tionofsettlingvelocityasaparameterforcharacterisingwastewatersolids[J].WatSciTech,1998,37(1):4552[4].UASB[D].,2002:3738[5],,.[J].,2004,35(1):5759[6]JimField.AnaerobicGranularSludgeBedTechnology[OL].Sep2tember20th,2002,(http:PP)[7],,.EGSB[J].,2002,20(4):37[8].(2)[M].:,1996:128131[9],,.[J].,2000,26(1):3338[10].[M].:,1998:147155[11],,.[J].,2003,21(1):1214[12]HulshoffPolLW.ThePhenomenonofGranularofAnaerobicSludge[D].TheNetherlands:WAU,1989:1001029712:UASB