UASB反应器中颗粒污泥的沉降性能与终端沉降速度刘永红

,,,.UASB[J].,2005,25(2):176-179LIUYonghong,HEYanling,LIYaozhong,etal.ThesettlingcharacteristicsandterminalvelocityofgranularsludgeinUASBreactor[J].ActaScientiaeCircum-stantiae,2005,25(2):176-179UASB刘永红1,2,贺延龄1,李耀中1,杨树成11.,　710049;2.,　710048:,UASB.,(1)(1Re100),,Allen;(2),.,.:UASB;;;;:0253-2468(2005)02-0176-04　　:X703　　:AThesettlingcharacteristicsandterminalvelocityofgranularsludgeinUASBreactorLIUYonghong1,2,HEYanling1,LIYaozhong1,YANGShucheng11.DepartmentofEnvironmentalScienceandEngineering,JiaotongUniversity,Xi'an,710049;2.DepartmentofEnvironmentalScienceandEngineering,XianEn-gineeringandTechnologyCollege,710049Abstract:Duetotheexcellentsettlingpropertiesofgranularsludge,UASBreactorsarewidelyusedinwastewatertreatment.ThesettlingcharacteristicsandterminalvelocityofgranularsludgeinUASBreactorswasdiscussedbyusingaterminalvelocitymodelontheviewofhydrodynamics.Theresultsshowedthat:(1)theset-tlingprocessofthemostgranularsludgewasinthecategoryofintermediateflowregime(1Re100)ratherthaninlaminarflowone,thesettlingvelocityofwhichwasinproportiontothegranulardiameterandinaccordancewithAllenformula;(2)theterminalsettlingvelocitywasmuchgreaterthanthatoftheliquidupflow,whichsuccessfullysolvedtheproblemofsludgewash-outunderhighorganicloadingrate(OLR).Thevalidityofthismodelwasverifiedbyusingtheoperatingpa-rametersofseveralanaerobicreactorsinthepractice.Furthermore,itcouldbeatheoreticaltheoryapplingasausefultoolforthedesignandtheoperationofthehigh-rateanaerobicreactorsKeywords:UASBreactor;granularsludge;hydraulics;intermediateflowregime;terminalvelocitymodel:2004-02-23;:2004-08-16:“863”(2002AA601190):(1968—),,(),[e-mail]　　()[1,2].(SRT)(HRT),,,,.、,[3].Stokes[4～6],Allen[7].,,(Stokes)(Allen),.1　　　UASB(upflowanaerobicsludgeblanket),ρ,μU′,,.,,、、.,:①,()dp,25220052　　　　　ACTASCIENTIAECIRCUMSTANTIAEVol.25,No.2Feb.,2005DOI:10.13671/j.hjkxxb.2005.02.008ρp;②,,;③()().:Fb=π6d3pρg(1)Fd=ξπd2p4ρu22(2)Fg=π6d3pρpg(3),Fb,Fg,Fd,u;g;ξ(dragco-efficient).,,.,,.,ut(ter-minalvelocity).,Fg-FbFd=π6d3pρpdudτ(4)　　(1)、(2)、(3)(4),dudτ=ρp-ρρpg-3ξρ4dpρpu2(5)　　dudτ=0,(5)ut=4gdp(ρp-ρ)3ξρ(6)　　,:ua=ut-U′(7)2　2.1　ua0utU′,,.2.2　ξ(6),ξ,.ξ,ξ=(Re)=(ρdsutμ)(8)　　(intermediateflowregime),1Re500,ξ[8]:　　ξ=18.5Re-0.6(9)　　:ut=0.781[d1.6(ρs-ρ)ρ0.4μ0.6]0.714(10)　　,:　　Re=ρdsutμ(11)2.3　,UASB0.5～2m·h-1,EGSB(Expandedgranularsludgeblanket)2～6m·h-1,IC(internalcircu-lationreactor)2～10m·h-1.1030～1080kg·m-3、0.14～5mm[9]..1030,1040,1050,1060,1070,1080kg·m-3,,0.3～2.5mm[10].10-3Pa·s,1000kg·m-3.1、2.1　Fig.1　TerminalSettlingvelocityofvarioussludgegranules　　1,1030～1080kg·m-3、0.3mm10m·h-1,.,,、.,,1772:UASB().　　,,[11]:(1).,.(2),.(3),,,.　　1,,SRT;,.,.　　2,0.3～2mm1～100;2mm160..2　Fig.2　Reynoldsnumberofsludgegranulesindifferetdensity2.4　,(1),3.10-3Pa·s.3(a),.,.,,,.1　5[12]Table1　Actualterminalvelocityoffivetypesofsludgegranulesmm(kg·m-3)(m·h-1)(Nedalco,BergenopZoom,TheNetherlands)1.5103952.9Ⅰ(CentralSuikerMaatschappij,Breda,TheNether-lands)1.89103883.3(Aviko,Steender-en,TheNetherlands)1.76105797.8(PapierfabrickRoermond,TheNetherlands)2.20104298.9Ⅱ(SuikerUnie,Roosendaal,TheNetherlands)0.80108253.63　Fig.3　Comparisonbetweencalculationresultsandactualvalue　　3(b)(10～70),.3　　　(1),;.(2),178　　　　　　　　　　25.UASB、EGSBIC.(3),.,、.:[1]　LettingaG,FieldJ,etal.Advancedanaerobicwastewatertreatmentinthenearfuture[J].WatSciTech,1997,35(10):5—12[2]　SchmidtJE,AhringBK.GranularsludgeFormationinupflowanaerobicsludgeblanket(UASB)reactors[J].BiotechnologyandBioengineering,1996,49:229—246[3]　HedgesPeterD,BeckerFionaA,SmissonRobertPM.Theapplica-tionofsettlingvelocityasaparameterforcharacterisingwastewatersolids[J].WatSciTech,1998,37(1):45—52[4]　　.UASB[D].,2002:37—38[5]　,,.[J].,2004,35(1):57—59[6]　JimField.AnaerobicGranularSludgeBedTechnology[OL].Sep-tember20th,2002,(http:)[7]　,,.EGSB[J].,2002,20(4):3—7[8]　.(2)[M].:,1996:128—131[9]　,,.[J].,2000,26(1):33—38[10]　.[M].:,1998:147—155[11]　,,.[J].,2003,21(1):12—14[12]　HulshoffPolLW.ThePhenomenonofGranularofAnaerobicSludge[D].TheNetherlands:WAU,1989:100—1021792:UASB