搜索
,*,,,(,116024):,8000mgL-1,(PDM).(PDMBR),(DO)3~5mgL-1,,,31dCOD1248mgL-1,9749%,NH+4-N527mgL-1,7613%,27kPa.PDMBR,PDM,.:;;;:X7031:A:0250-3301(2006)10-2003-06:2005-08-09;:2005-10-19:(20031083):(1980~),,,.*ExperimentalStudyonApplicationoftheBoundaryLayerTheoryforDeterminingSteadyAerationIntensityofPrecoatedDynamicMembraneBioreactorYEMao-sheng,ZHANGHan-min,WEIQ-ifeng,YANGFeng-lin,MAHui(SchoolofEnvironmental&BiologicalScience&Technology,DalianUniversityofTechnology,Dalian116024,China)Abstract:TherheologicalbehaviourofthelowsludgeconcentrationliquorinMBRwasinvestigatedandmadeaconclusionthatthisliquorapproximatedtotheNewtonianfluidwhiletheconcentrationofthesludgewaslessthan8000mgL-1.Furthermore,whenthelaminarflowboundarylayerthicknessonthesurfaceofflatmembranecameuptothethicknessofprecoateddynamicmembrane(PDM),thesteadyaerationintensitywascalculatedbyusingtheboundarylayertheoryintheNewtonianhydrodynamics.Inordertoensurethestabilityofthepre-coateddynamicmembranebioreactor(PDMBR),oxygensupplyaerationintensitywaschosentosupplythebestdissolvedoxygen(3~5mgL-1)intheinitialstagesandgraduallyincreasedtothesteadyaerationintensity.TheresultsindicatedthatthismodecouldenhancethestabilityofPDM.Intheexperimentperiod(31d),effluentCODwaslessthan1248mgL-1anditsaverageremovalratewas9749%,NH+4-Nwaslessthan527mgL-1anditsaverageremovalratewas7613%,whiletheoperationalpressurejustincreasedto27kPa.Duringthelastperiodoftheexperiment,thestabilityofthePDMBRwasstudiedwhentheaerationintensitywasmorethanthesteadyaerationintensityanditwasfoundthattheprecoatedlayerhadbeenbrushedofffromthesurfaceofcommonfiltercloth,sothisphenomenonprovedthatusingtheboundarylayertheorycoulddeterminesteadyaerationintensityofPDMBR.Keywords:precoateddynamicmembrane;boundarylayer;aerationintensity;flatmembrane(membranebioreactor,MBR),(dynamicmembranebioreactor,DMBR).DMBR,,(precoateddynamicmembrane,PDM)[1](sel-fformingdynamicmembrane,SFDM).[2]Kiso[3]100m,,,,,,[2].Galjaard[4],PDM,2710200610ENVIRONMENTALSCIENCEVol.27,No.10Oct.,2006,.(precoateddynamicmembranebioreactor,PDMBR)[5],PDM,,.MBR,,,PDM,,,PDM,PDMBR,.1MBR,ReRec,,,Rec,,Rec[6].,.MBR[7].,,[8].PDMBRMBRMLSS,MBRMLSS.,,[7].NDJ-7,,251.005,,(Happel)[9]:=l(1+5.5)(1),l,Pas-1;,Pas-1;.MLSS,,(1),MLSS.2().,,,.,PDM,.,PDM,,.PDM,PDMBR,.[10],:bD=52Ref(2),b,m;D,D=4R,R,m;ReD;f,.-(Prandt-lKarman):1f=4.0lg(Ref)-0.4(3)(2)(3)Re.,,:Re=VgD(4),Vg,ms-1;,m2s-1.,Vg024~035ms-1,:Vg=1.35(-g)Rb(5),,Nm-1;200427,kgm-3;g,129kgm-3;Rb,m.Vb,m3,:Vb=43R3b(6),-(Davidson-Schuler):Vb=431415Qg2g(-g)34(7),Qg,m3s-1;g,98ms-2;,Pas-1.(4)(5)(6)(7)Qg.33.11,256m,22cm,0087m2.(PAC,:200,80%;:1030mgg-1).PDM,25cm,25cm,2cm.1;2;3;4;5;6;7;8PDMBR1Fig.1Schematicdiagramoftheexperimentation12L(25cm12cm40cm),,162Lh-1,186L(m2h)-1,74h;(251);3min3min;.3.2PDM,,,PDM,PDMBR,PDM(SMP),,,.LuDOMBR,,,30~50mgL-1[11].MBR,PDMBR70Lh-1,.,,,PDMBR(70Lh-1)10L,,.,PDM,.PDMBR,PDM.,CODNPFe=1005101,,MgSO47H2OCaCl22H2OFeSO42H2ONaClCuSO45H2O.,PDMBR,MLSS3000mgL-1,MLVSS/MLSS058.3.3NDJ-7MLSS;K12;[12]CODNH+4-N.44.123MLSS(1).,2,3,MLSS,200510MLSS,,(8)MLSS.=310-5MLSS+1.0477(8)(8)MLSS010477mPas-1,1036mPas-1,Xing[13]MBRMLSS.=6106MLSS+0.0021(9)(9)(1)005,MLSS8000mgL-1,PDMBR,.2Fig.2ApparentviscosityofdifferentMLSSconcentration3Fig.3ConstantofdifferentMLSSconcentration4.2PAC025~035mm[14].135gPAC03mmPDM,b.MLSS3000mgL-111510-3Pas,1003kgm-3,=/11510-6m2s-1;K120078Nm-1.D0037m,,86Lh-1,Qg172Lh-1.4.3PDM4PDMBR.4,(70Lh-1)10Lh-1(172Lh-1)10d,PDM,,(p).4Fig.4Variationoftrans_dynamicmembranepressureversustimeunderconstantpermeateflux10~30d,PDMBR172Lh-1,DO7~8mgL-1,,.,PDM,,PDM,PDMBR30d,PDM27kPa.29d,31d200Lh-1,,PDM..,PDM,PDM,200627(172Lh-1)(200Lh-1).,PDM0004MPa,PDM,11d004MPa,.,,,SFDMSFDM4d[5].[15],3000mgL-136m3(m2h)-1,57m3(m2h)-1.4.4PDMBRCOD21422~46457mgL-1,35425mgL-1.5,PDMBR(0~31d),COD1248mgL-1,97.49%.31~33dCOD,,,,,COD2092mgL-1,9616%,PDMSFDMPDM.5,PDMBRCOD4676mgL-1,8650%,PACCOD,PAC7484%,PAC.5COD,CODCOD,PDM,PDMBR.NH+4-N1205~3473mgL-1.6,PDMBRNH+4-N,30%.PDMBR,,NH+4-N,80%.(7~31d),PDMBRNH+4-N527mgL-1,7613%.PACNH+4-N,NH+4-N,PDMBR.,PDM[5],90%,PDM,.5CODFig.5CODconcentrationandremovalefficiencyinthesupernatantandeffluentinthesystem6NH+4-NFig.6NH+4-Nconcentrationandremovalefficiencyintheeffluentinthesystem5(1)MBR,MLSS8000mgL-1.(2)PDMBR172Lh-1,31d27kPa.,PDM.PDM.200710(3)PDMBR31dCOD1248mgL-1,9749%,NH+4-N527mgL-1,7613%,PDM.:[1]FanB,HuangX.Characteristicsofasel-fformingdynamicmembranecoupledwithabioreactorformunicipalwastewatertreatment[J].Environ.Sci.Technol.,2002,36:5245~5251.[2],,,.-[J].,2002,23(6):51~56.[3]KisoY,JungYJ,IchinariT,etal.Wastewatertreatmentperformanceofafiltrationbio-reactorequippedwithameshasafiltermaterial[J].WaterRes.,2000,34(17):4143~4150.[4]GaljaardG,BuijsP,BeerendonkE,etal.Pre-coating(EPCE)UFmembranesfordirecttreatmentofsurfacewater[J].Desalination,2001,139(1-3):305~316.[5],,,.-[J].,2005,25(2):249~253.[6],,,.[J].,2003,23(1):53~57.[7]SandraR,KirstenK,MatthiasK.Rheologyofactivatedsludgeinmembranebioreactors[J].Eng.Life.Sci.,2002,2(9):269~275.[8],.-[J].,1997,18(5):19~22.[9],,.[M].:,1987.270~271.[10],.[M].:,1991.287~292.[11]LuSG,Imai