低温时污泥膨胀对MBR中膜污染的影响任南琪

MBR,,＊(,　150090):,.,COD85%92%,.MBR,,(FI)25,.,15d.7d,.,(EPS)3,(RH)FI.EPSRH,,.,、Zeta、.:;;;:X703.1　:A　:0250-3301(2009)01-0155-05:2008-01-02;:2008-03-23:(5050811);(50638020);(200866):(1959～),,,,,E-mail:[e-mail]＊,E-mail:[e-mail]nMembraneFoulingofMBRUnderLowTemperatureRENNan-qi,LIUJiao,WANGXiu-heng(StateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology,Harbin150090,China)Abstract:Theperformanceandmembranefoulingofsubmergedmembranebioreactorwerestudiedinthecaseofactivesludgebulkingunderlowtemperature.Thefactorscontributingtomembranefoulingwerediscussedfromthemicroorganismaspect.TheresultsshowedthatCODremovalefficienciesofsupernatantandpermeatewere85%and92%respectivelyandfilamentoussludgebulkinghadlittleimpactonthem.Thesludgesettleabilitybecamebadandthefilamentindex(FI)increasedfrom2to5duringtheformationoffilamentoussludgebulkingunderlowtemperature.Thefilamentousbacteriaextendingfromthesludgeflocsformednetstructure.MembranefoulingchangedwithtimeinlinearunderlowtemperatureandtheoperationperiodofMBRwas15d.However,membranefoulingwasmoreseriousintheconditionoffilamentoussludgebulkingatlowtemperature,shorteningtheoperationperiodofMBRto7d.Theextracellularpolymericsubstances(EPS)contentofbulkingsludgewasthreetimesasthatofnormalsludgeandtherelativehydrophobicity(RH)ofsludgeflocswasdecreasedasFIincreased.TheincreaseofEPSandRHmaycausemorematerialstodepositonthemembranesurface,thusthemembranefoulingrateimprovedandtheoperationperiodofMBRbecameshort.Furtheranalysisindicatedthatthemixedliquidviscosity,Zetapotentialandsludgeflocstructurewereallimportantfactorsofmembranefouling.Keywords:membranebioreactor;lowtemperature;sludgebulking;membranefouling　　,(membranebioreactor,MBR),MBR[1,2].,,MBR[3].,MBR,[4,5].Choi[6],,.EPS、[7].,MBR.、[8],MBR.,.1　1.1　(1),30L.,,8min3min,.30120091　　　　　　ENVIRONMENTALSCIENCEVol.30,No.1Jan.,2009DOI:10.13227/j.hjkx.2009.01.015,0.2μm,1m2,10L(m2·h).,0.32m3h.(1),6500mgL,7～8℃.1.;2.;3.;4.;5.;6.;7.;8.;9.;10.;11.;12.1　Fig.1　Schematicdiagramoftheexperimentalsystem　1　Table1　Compositionsofsyntheticwastewatermg·L-1mg·L-1500COD395～475NH4Cl128TOC133～154KH2PO458NH+4-N30～38MgSO4·7H2O10PO3-4-P6～8CaCl250FeSO4·2H2O15NaHCO3401.2　COD,MLSSMLVSS,.Jenkins[9](filamentindex,FI),(Olympus,CX31).FI6(0～5):0,5.EPS-NaOH[10],Lowry[11],-[11],EPS.[7].2　2.1　MBR,SVIFI(2),(3).SVI100,,、,(3a),FI2.,,,,.MBR15dSVI140,,,,.,FI5.1,,(3b),.2　SVIFIFig.2　VariationsofSVIandFIinsludgebulkingformation　3　(100×)Fig.3　Microscopephotosofsludgeflocs(100×)　2.2　MBR2.2.1　COD4,MBRCOD85%92%,COD.,,.156　　　　　　30,,MBRCOD.,COD,,[12].,COD.4　CODFig.4　CODremovalefficienciesduringsludgebulking　2.2.2　MBRMBR,15d,TMP4kPa30kPa,TMP(5).MBR,TMP,TMP,[13]..15d,SVI130,,15d7d,.Meng[7],,,.5,TMP,、[14],,.2.3　2.3.1　EPS(extracellularpolymericsubstances,5　Fig.5　Membranefoulingduringsludgebulking　EPS),,、DNA[15].6MBREPS.,EPS3,.,[16],.,,EPS.6　EPSFig.6　ComparisonofEPSbetweennormalandbulkingsludge　56,EPS,,.[17],EPS.Nagaoka[18]EPS,,.EPS,1571:MBR.MBR,EPS,,.2.3.2　RH(relativelyhydrophobicity,RH),.,,.MBR7.,RH.57,RH,,,.[17],EPS,RH,RHEPS.Lee[19],RHEPS,EPS.(6、7),EPS.7　RHFig.7　ComparisonofRHbetweennormalandbulkingsludge　2.3.3　,,.,.,,(6),.,,,.Zeta,.Wilén[20],Zeta.Meng[7],Zeta,.,EPSZeta,,.,,、(3).,,.Meng[21],.,,,,,.3　(1)MBR,FI125,,,,.(2)MBRCOD85%92%,COD.TMP,15d7d,.,MBR.(3)、、、Zeta,,,.:[1]　GuglielmiG,ChiaraniD,JuddSJ,etal.Fluxcriticalityandsustainabilityinahollowfibresubmergedmembranebioreactorformunicipalwastewatertreatment[J].JMembrSci,2007,289:241-289.[2]　,,.[J].,2007,28(1):131-136.[3]　,,.[J].,2006,9(4):469-473.158　　　　　　30[4]　,.-[J].,2006,38(6):888-892.[5]　,,.MBR[J].,2004,25():56-58.[6]　ChoiJG,BaeTH,KimJH,etal.Thebehaviorofmembranefoulinginitiationonthecrossflowmembranebioreactorsystem[J].JMembrSci,2002,203:103-113.[7]　MengFG,ZhangHM,YangFL,etal.Effectoffilamentousbacteriaonmembranefoulinginsubmergedmembranebioreactor[J].JMembrSci,2006,272:161-168.[8]　,,.[J].,2007,28(2):377-381.[9]　JenkinsD,RichardMG,DaiggerGT.ManuelontheCausesandControlofActivatedSludgeBulkingandFoaming[M].Lafayette,CA:RidgelinePress,1986.[10]　LiuH,FangHP.Extractionofextracellularpolymericsubstances(EPS)ofsludges[J].JBiotechnol,2002,95:249-256.[11]　LoweryOH,RosebroughNJ,FarrAL,etal.Proteinmeasurementwiththefolinphenolreagent[J].JBiolChem,1951,193:265-275.[12]　,,.[J].,2006,18(2):67-69.[13]　SombatsompopK,VisvanathanC,BenAR.Evaluationofbiofoulingphenomenoninsuspendedandattachedgrowthmembranebioreactorsystems[J].Desalination,2006,201:138-149.[14]　,,.-[J].,2004,24(2):247-251.[15]　LiXY,YangSF.Influenceoflooselyboundextracellularpolymericsubstances(EPS)ontheflocculation,sedimentationanddewaterabilityofactivatedsludge[J].WatRes,2007,41:1022-1030.[16]　,,.[J].,2006,36:141-143.[17]　,,,.[J].,2006,27(7):1348-1352.[18]　NagaokaH,UedaS,MiyaA.Influenceofbacterialextracellularpolymersonthemembraneseparationactivatedsludgeprocess[J].WatSciTech,1996,34:165-172.[19]　LeeJ,AhnWY,LeeCH.Comparisonofthefiltrationcharacteristicsbetweenattachedandsuspendedgrowthmicroorganismsinsubmergedmembranebioreactor[J]