超滤膜的超声波助清洗研究

1,2,2(1.,100012;2.,100085):.:20W,30W,.,,20W,,2030min5min,.SEM,,.:;;;:TQ12818;X703:A:025023301(2003)0620520130:(KZ9512A12201202;KZ95T205):(1975),,,,.:2002211217;:2003202213StudyonAssistantCleaningofUltrasoundfortheUltrafiltrationMembraneZhangGuojun1,2,LiuZhongzhou2(1.CenterforEnvironmentalEngineering,ChineseResearchAcademyofEn2vironmentalSciences,Beijing100012,China;2.ResearchCenterforEco2EnvironmentalSciences,ChineseAcademyofSciences,Beijing100085,China)Abstract:Theeffectsofultrasoundswithdifferentfrequencyonmembraneperformancewereinvestigatedinthispaper.Theexperimentalresultsshowthattherewerenearlynoeffectsof20Wultrasoundonmembraneretentioncoefficient,butitdecreasedseriouslywhentheultrasoundpowerwasabove30W.Onthebasisoftheseresults,lowfrequencyultra2sound(20W)wasintroducedtoassistthechemicalcleaningintheultrafiltrationprocessofwastewaterfrombanknoteprintingworks.Thecleaningtimecouldbeshortenedfrom2030minto5minbytheultra2liberationandultra2blendeffectsofultrasound,therefore,thecleaningefficiencywashighlyimproved.However,thefoulingsubstancescouldnotbecleanedentirelyinthesimplephysicalcleaningprocessbySEManalysis.Keywords:lowfrequencyultrasound;ultrafiltration(UF);membranecleaning;wastewaterfrombanknoteprintingworks[1].(ultra2sound,US)(ultrafiltration,UF).[25]:UF,,2[6]:;.,.,,,,.,,.11111:(20W50W),40kHz,.246200311ENVIRONMENTALSCIENCEVol.24,No.6Nov.,20032:100W,40kHz,.:754,.S250MK3,.:,30000.:,,30000,.(BSA):.:.,.:.1121.2.,010157m2,,,.1Fig.1Flowsheetofflatultrafiltrationexperimentalapparatuses1130110MPa,280nmBSA,(1),BSANaOH.2Fig.2Flowsheetofhollowfiberultrafiltrationapparatusesindynamicultrasoniccleaningprocess114SEM50%10h,,.115:JPW=VSt,JPW[L/(m2h)],V(L),S(m2),t(h).R=c0-c1c0(1),R(%),c0BSA,c1BSA.221120W30W40W50W100W30min,.1.1,,30W,,13161Table1Effectsofultrasoundpoweronultrafiltrationperformance/W/L(m2h)-1/L(m2h)-1BSA/%BSA/%20180212971697133019635098125413401875209810341350190570981022111001935839810221350W,.,,.,1,20W,,.20W5,2.220WTable2Effectsof20Wultrasoundonultrafiltrationperformance/L(m2h)-1/L(m2h)-1BSA/%BSA/%1180212971697132188193981598153203205981398114213240981398105188199981298122,20W,,,,,.,20W,.,.[7],.21221211,20W,3.3,20W,,.3,SEM.3()/L(m2h)-1Table3Physicalcleaningefficiencyusingultrasound(Purewaterflux)/L(m2h)-1/min12023151043462043463043463(a)(b),,,.,,,.2121223124(a)(PS/PDC);(b)(PS/PDC)(20W)(60115m/s0110MPa)30min3SEMFig.3SEMofmembranesurfaceusingultrasonicphysicalcleaning018%NaOH+018%+013%+9811%3,20W,4.4,20W4Fig.4Effectsofchemicalcleaningassistedbyultrasound3,..,:02119851.9..5min,2030min.55minSEM.5(a)(b)4,5min,.,,,,,3316,,;,,.3(a)(PS/PDC);(b)(PS/PDC)(20W)(018%NaOH+018%+013%+9811%,60115m/s0110MPa)5min5SEMFig.5SEMofmembranesurfaceusingchemicalcleaningassistedbyultrasound(1),(20W),,.(2),.,,,2030min5min..:1,11,2001,21(4):3945.2AhnerN,GottsechD,NarangS.Piezoelectricallyassistedultrafiltration.Sep.Sci.Technol.,1993,28(123):895908.3KokuganT,FujiwaraS,ShimizuM.Ultrasoniceffectonul2trafiltrationpropertiesofceramicmembrane.Membrane,1995,20(2):213215.4SabriN,PikonenP,SekkiH.Ultrasonicallyenhancedmem2branefiltrationofpapermilleffluent.ProceedingsofFirstConferenceonApplicationsofPowerUltrasoundinPhysicalandChemicalProcessing.FranceToulouse:1997.99103.5ChaiX,KobayashiT,FujiiN.Ultrasoundeffectoncross2flowfiltrationofpolyacrylonitrilultrafiltration.J.Membr.Sci.,1998,148(1):129135.6..:.2002.7GuojunZhang,ZhonzhouLiu.Membranefoulingandclean2ingintheultrafiltrationofwastewaterfrombanknoteprint2ingworks.J.Membr.Sci.,2003,211:235249.43124