给水超滤膜系统中曝气对膜通量的影响及其机理研d

Vol35No112009129雷晓玲(,400074)通过系列试验探讨了淹没式给水超滤膜系统中曝气对膜通量的影响及其机理,结果表明:淹没式给水超滤膜系统中膜通量随时间和过滤水量的变化均由快慢两个指数衰减模式共同组成,其衰减过程符合相似的衰减方程式;曝气可有效改变膜表面的流体流态,提高膜通量,最大假想稳定态膜通量及其最小衰减系数均在曝气条件下达到;曝气强度对膜通量改善影响明显,曝气强度越大,膜通量改善程度越强,但超过一定曝气强度后曝气强度对膜通量改善的影响甚微给水超滤膜系统曝气膜通量衰减模式影响机理StudyonmechanismsandimpactsofaerationonthemembranefluxindrinkingwaterultrafiltrationmembranetreatmentLeiXiaoling(ChongqingJiaotongUniversity,Chongqing400074,China)Abstract:Thispaperstudiedtheinfluenceofaerationinthesubmergeddrinkingwaterultrafiltrationmembranesystemonmembranefluxanditsmechanisms.Theresultsshowedthat:thevarianceofthemembranefluxinthesubmergeddrinkingwaterultrafiltrationmembranesystemdependingontimeandpermeatedfluxwascomposedofrapidandslowexponentialevanescentmodes,andtheevanescentprocessesmatchedthesimilarevanescentequation;aerationcouldefficientlyimprovethefluidflowpatternonthemembranesurface,increasemembraneflux,andrealizethemaximumtheoreticalstablemembranefluxandtheminimumevanescentcoefficient;theinfluenceofaerationonmembranefluxwasobvious,themoreaerationintensitythebetterimprovementonmembraneflux,buttheinfluencebecameindifferentwhentheaerationintensitywasabovecertain.Keywords:Drinkingwaterultrafiltrationsystem;Aeration;Membraneflux;Evanescentmode;Impactsmechanisms01960,:2008([2009]11);NaturalSciencesandEngineeringResearchCouncilofCanada(NSERC);([2009]4),(),[1],(),,()130Vol35No112009()[2~4],CuiChangFane2003[5],,,,[6],,,111:Jv=PRm(1)Jv,L/(m2h);P,N/m2;,Ns/m2;Rm,Ns/m3,,,,,,,,,,(2)Jv=P(Rm+Rr)(2)Rr,Ns/m3,,Hermia1982::,:,[7],/12,[8],,[9~11]OzakiYamamoto2001,;6h,,ChangFane2002[12]:;,;221,11Vol35No112009131,:,22()()(+),,2a2(),,2b23,,3,:002m/s03m/s04m/s3,()11/m/s/mL/min/mL/min00000023800303200250364005153004204102008275006024,22/m/s1()021-1-T-A031-1-T-B041-1-T-C2()021-2-T-A031-2-T-B041-2-T-C3()01-1-T-025,(3NTU)()51,132Vol35No1120093TOC/m/sTOC/mg/LTOC/mg/LTOC/%0866920202904550003115495720494445320288504320310848553049544537TOC333144:(1),(2),:a;b;c(3),,,(4),260min(5),:a;b;c32Hermia1982:,,,55:(1)(2),(3),:a;b;c(4),,,(5),07L,(6),:a;b;c441,:Vol35No112009133Jv=cexp-a(t,V)+dexp-b(t,V)(3)a,b,c,d;t,h;V,L(3),44(3)/m/s(I2)102098520985003093230933304091980909720209901099480309536095870409486094953000979309953,,(3),(3)HermiaField19921995,,1995Field,(J0)()(Jss)[13],Field,,(3),,[(3)c](Jss)(a),((3)),(b),(3)(4)Jv=(Jo-Jss)exp-aV+Jssexp-bV(4)Jo,L/(m2h);Jss,L/(m2h);a,L-1;b,L-1;V,L(4),99%42(41psi(277kPa),25)6,2405L/(m2h),,643(Sigmaplot80,SPSSScience,Inc),(4)55:,,;;,,,44134Vol35No1120095/m/s(Jss)/L/(m2h)(a)/L-1(b)/L-11024291688390270673004503380447828097046301200444212977703203590025202650130536017023500140391842477811203090049049371005361310268009630025712969301608390043,777:,(1/Jss),(4),(5)Jv=(Jo-Jss)exp-aV+Jssexp-bV(1/Jss)(5)b,b=2144214(L-1)551(1),,(2),(3)(4),:(5),:(6),:Jv=(Jo-Jss)exp-a(t,V)+Jssexp-b(t,V)(6)(7)2405L/(m2h)(41psi(277kPa),25)(8),,(9),,,(10),(1/Jss)Jv=(Jo-Jss)exp-aV+Jssexp-bV(1/Jss),,b=2144214(L-1)52(1),,;,,,(2),,,参考文献1EPA815-D-03-008Membranefiltrationguidancemanual,2003Vol35No112009135王婵1张锡辉1冯兆敏2李辉2(1,518055;2,614032)R市属于典型沿海城市,采用多水源供水系统,其受到上游污染城区污染和近海咸潮上溯等多重影响调查分析了R市水源及给水厂出厂水质指标,包括溶解氧藻类浊度氨氮氯化物等,结果表明R市的复杂水源对给水厂出水水质产生规律性的交替影响根据水源水质变化规律,提出了多水源调控和给水厂工艺运行相结合的联合供水模式,以保证安全供水安全供水多水源水质咸潮,,,,,;[1],863(2008AA06A413);(U0773002,20721140019),,;[2],,[3],,,,R,,,2ChengTW.Influentofinclunationongas-spargedcross-flowultrafiltrationthroughaninorganictubularmembrane.JMembrSci,2002,196(1):1033CuiZF,GhoshR,YuJ,etal.Anexperimentalstudyoffluxenhancementwithairsparginginahorizontaltubularmembranemodule.In:ProceedingsoftheSixthWorldCongressonChemicalEngineering,Melbourne,20014VerberkJQJC,HoogeveenPE,FutselaarH,etal.Hydraulicdistributionofwaterandairoveramembranemoduleusingairflush.WatSciandTech,WaterSupply,2002,2(2):2975CuiZF,ChangS,FaneAG.Theuseofgasbubblingtoenhancemembraneprocesses.JMembrSci,2003,(221):16BellaraSR,CuiZF,PepperDS.Gasspargingtoenhancepermeatefluxinultrafiltrationusinghollowfibremembranes.JMembrSci,1996,121:1757DucomG,PuechFP,CabassudFP.Airspargingwithflatsheetnanofiltration:Alinkbetweenwallshearstressandfluxenhancement.Desalination,2002,145:978CabassudC,LaborieS,Durand-BourlierL,etal.Airsparginginultrafiltrationhollowfibers:Relationshipbetweenfluxenhancement,cakecharacteristicsandhydrodynamicparameters.JMembrSci,2001,181(1):579TahaT,CuiZF.CFDmodellingofgasspargedultrafiltrationintubularmembranes.JMembrSci,2002,210:1310UmMJ,YoonSH,LeeCH,etal.Fluxenhancementwithgasinjectionincrossflowultrafiltrationofoilywastewater.Pergamon,2001,(01)00155-511VerberkJQJC,HoogeveenPE,FutselaarH,etal.Combinedair-waterflushindead-endultrafiltration.WatSciandTech,WaterSupply,2001,1(5/6):39312ChangS,FaneAG.Filtrationofbiomasswithlaboratory-scalesubmergedhollowfibremodules-effectofoperatingconditionsandmoduleconfiguration.JournalofChemicalTechnologyandBiotechnology,2002,77:103013VeraL,DelgadoS,ElmalehS.Dimensionlessnumbersforthesteady-statefluxofcross-flowmicrofiltrationandultrafiltrationwithgassparging.ChemEngSci,2000,55:3419:13983290829E-mail:[e-mail]:2008-09-11:2009-10-30