错流膜生物反应器水力清洗特性研究李春杰

20219993　　　　　　ENVIRONMENTALSCIENCEVol.20,No.2Mar.,1999*李春杰　何义亮(,　200092)　　　　欧阳铭(,　730070)　-.:、,;vk=1.92m/s,10min,0.07MPa.　,,,,.*　:,27,:1998-08-22StudyontheCharacteristicsofHydraulicCleaninginCrossflowMembraneBioreactorLiChunjie　HeYiliang(SchoolofEnvironmentalEngineering,TongjiUniversity,Shanghai200092,China)OuyangMing(Dept.ofEnviron.Eng.,LanzhouRailwayInstitute,Lanzhou730070,China)Abstract　TheexternalpressuretubularmoduelandPS-PANblendedmembraneswereusedinthestudyonthecharacteristicsofhydrauliccleaningincrossflowmembranebioreactor.Itwasdemonstratedthatlowtrans-membranepressureandhighvelocitiesalongmembranesurfaceplayedanimportantroleinremovingthefoulinglayerandsodidtheeliminationoftheeffectoftheconvectivetransporttomembranebecausethepressuredifferencesacrossthemembranewerereducedtozero.Considerationsofthemechanismofmasstransferintheformationande-liminationofthemembranefoulingfurtherlysupportedthesecleaningconditions.Thecleaningoperationparameterswereobtainedatcrossflowvelocityalittlemorethanvk=1.92m/swhichwasthecriticalvelocity,cleaningtimeabout10min,trans-membraneabout0.07MPa.Keywords　membranebioreactor,crossflow,membranefouling,hydrauliccleaning,mechanismofmasstransfer.　　,.,、(),(),.()().[1,2],.,.1　1.1　DOI:10.13227/j.hjkx.1999.02.0141.,-(PS-PAN),6×104.A.　B.　P1、P2、P3　1.2.　3.　4.　5.6.　7.　8.　9.10.　11、12　13.1　,.1.2　.,1.1　/mg·L-1CODCrBOD5SSNH3-NpH148—25298—18428—1519.8—34.36.8—7.61.3　,,Jrel,:Jrel=JJw×100%,JL/(m2·h),JwL/(m2·h).,1h,,Jrel.2　2.1　,,ReΔpCF(=p1-p2),Rekvk.2.2　logΔpCF-logRe2,Rek=673.5(),vk=1.92m/s,.(ΔpTM),2.1(vs),(vc)(3).ΔpTM=0.12MPa　vs=1.92m/s　a.vc=1.92m/s　Jw=37.4L(m2·h)　b.vc=5.26m/s　Jw=36.2L/(m2·h)c.vc=7.04m/s　Jw=38.0L/(m2·h)3　58　　　　　　20　　,,,,,,.,,.310min,,,,10min.2,,4.ΔpTM=0.12MPa　vc=7.04m/s　Jw=38.0L/(m2·h)a.vs=7.04m/s　b.vs=1.92m/s4　4ab(Jrel)(Jrel).,ab,,2.,,[3],,.2.2　(vc=3.64m/s),5.,(c).,,,,.,,Jw,Jrel,.,0.07MPa.a.ΔpTM=0.17MPa　Jw=54.0L/(m2·h)b.ΔpTM=0.13MPa　Jw=39.1L/(m2·h)c.ΔpTM=0.07MPa　Jw=21.3L/(m2·h)5　,,..2.3　15,,,6.ΔpTM=0.1MPa　vc=5.26m/s　Jw=31.3L/(m2·h)a.,b.6　592　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　,.,0,,,.3　.3(7a),(Js+Jv)·c(,Js,Jv),(-Dg·dc/dy)()Js·ax.,cg.7a3,,cb≠0,(Js+Jv)·c.(7b),,cb=0,Jv·c,3,,Js·axJv·c.,Js·ax;,;7c,(),.7　4　(1),vk=1.92m/s,10min;.(2),0.07MPa,.,,.1　BelfortGandNagataN.Fluidmechanicsandcrossflowfiltration:somethoughts.JoumalofDesalination,1985,53:57—612　MellisR.Fluiddynamicsinatubularmembtrane:throryandexperiment.Chem.Eng.Comm.,1993,122:103—1253　.-.、().1995,95—10260　　　　　　20