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,,,,,(, 250100):.5.6m3(m2·h)、5min,45min,5NTU.,2,15h.,.,,3×10450%..:;;;:X703.3 :A :0250-3301(2007)06-1241-04:2006-06-26;:2006-08-09:(2004BS08009):(1976～),,,,,E-mail:zhangjian00@sdu.edu.cnOnlineAerationBackwashingintheInverseDirectionofEffluentAppliedinDynamicMembraneBio-reactorZHANGJian,QIUXian-feng,GAOBao-yu,ZHANGCheng-lu,LIUDong-mei,JINGYu-ming(SchoolofEnvironmentalScienceandTechnology,ShandongUniversity,Ji'nan250100,China)Abstract:Aerationintheinversedirectionofeffluentwasappliedasthemeasureofonlinebackwashingtocontrolmembranepollutioninthedynamicmembranebio-reactortreatingsewagewastewater.Whentheintensityofaerationwas5.6m3(m2·h)andtheaerationtimewas5min,ittook45minforthedynamicmembranetorecoverfiltrationcapacity.Withtherecoveryofdynamicmembranefilterability,effluentturbiditywasbelow5NTU.Thebackwashingintervalofthereactorcouldmaintainabout15h.SEMpicturesshowedthatonlineaerationbackwashingintheinversedirectionofeffluentcouldefficientlydestroypartofdynamicmembranelayer.Afterthedynamicmembranerecovery,dynamicmembranecouldcheckmorethan50%TOCofvariousmoleculeweightsrange3×104.Aerationintheinversedirectionofeffluentwasaneconomicalandeffectivemeansofonlinebackwashinginthedynamicmembranebio-reactor.Keywords:onlinebackwashing;inversedirectionofeffluent;dynamicmembrane;membranebio-reactor ,,,[1～4].Yoshiaki0.1mm,[5,6].0.1mm,,[1,2,7].,,50m3(m2·h)[8,9].,10h[10].Al-Malack100%[11].,,;,,.,,.1 1.1 1,,、、30cm、25cm、50cm,.,.PVC、,.2,0.1228620076 ENVIRONMENTALSCIENCEVol.28,No.6Jun.,2007DOI:10.13227/j.hjkx.2007.06.013m2.,.,1,2,.1 Fig.1 SchematicdiagramofDMBRequipment ,1.8000mgL.,6h,21L(m2·h).1 mg·L-1Table1 Concentrationofpollutantsinwastewatermg·L-1CODpH90～15727～4940～626.8～7.81.2 HACH2100P,COD、、[12].[13].[14],OMEGACELL(1000、30000100000).:=c0-c1c0×100%:c0TOC;c1TOC.(HitachiS-570),[12].2 2.1 ,,,,,,.2.1.1 5min,2.2 Fig.2 Influenceofaerationintensityondynamicmembranerecovery 2,80NTU,,,5NTU,,.3.2m3(m2·h),30min;5.6m3(m2·h),45min;8.0m3(m2·h),60min.,.,COD、78.4%、95.0%40.0%.,5.6m3(m2·h).2.1.2 ,5.6m3(m2·h),3.3,90NTU,,,5NTU,,.3min,30min;5min,45min;10min,1242 283 Fig.3 Influenceofaerationtimeondynamicmembranerecovery 60min.,.,COD、78.4%、95.0%40.0%.,5min.2.2 ,5.6m3(m2·h),5min,MLSS8000mgL,30L(m2·h),40cm,(nn-1、n)4.4 Fig.4 Changesofbackwashinterval 4,2,67,70h,,,,,15h.,、,.2.3 5.6m3(m2·h)、5min,5.5 Fig.5 SEMpicturesofdynamicmembrane 5,1,,,.,12436:,.2.4 5.6m3(m2·h)、5min,,5515h,2.2 Table2 Retainingrateofdynamicmembraneh%10001～3000030～10000010000008.5615.7820.3425.67132.5442.6751.0653.87333.8944.1251.4554.06634.2444.8451.7554.281034.3645.0551.8454.311534.5645.0951.9354.38 2,55,,1h,.,100034%,3000050%.3 (1).5.6m3(m2·h)、5min,45min,5NTU.(2)5.6m3(m2·h),5min,2,15h.,.(3),3×10450%.:[1],,,.-[J].,2002,23(6):51～56.[2]FanB,HuangX.Characteristicsofaself-formingdynamicmembranecoupledwithabioreactorformunicipalwastewatertreatment[J].EnvironmentalScienceTechnology,2002,36(23):5245～5251.[3]ParkMS,YoshiakiKiso,JungYJ,etal.Sludgethickeningperformanceofmeshfiltrationprocess[J].WaterScienceandTechnology,2004,50(8):125～133.[4]WuY,HuangX,WenX,etal.Functionofdynamicmembraneinself-formingdynamicmembranecoupledbioreactor[J].WaterScienceandTechnology,2005,51(6～7):107～114.[5]YoshiakiK,JungYJ,IchinariT,etal.Wastewatertreatmentperformanceofafiltrationbio-reactorequippedwithameshasfiltermaterial[J].WaterResearch,2000,34(17):4143～4150.[6]WangWen-hui,JungYong-Jun,YoshiakiKiso,etal.ExcesssludgereductionperformanceofanaerobicSBRprocessequippedwithasubmergedmeshfilterunit[J].ProcessBiochemistry,2006,41(4):745～751.[7],,.[J].,2003,24(5):65～69.[8],,.[J].,2005,24(1):14～17.[9].[D].:,2005.[10].-[D].:,2005.[11]Al-MalackMH,AndersonGK.Cleaningtechniquesofdynamicmembrane[J].SeparationandPurificationTechnology,1997,12:25～33.[12].[M].().:,2002.[13],,,.-[J].,2001,22(3):20～24.[14],,,.[J].,2003,24(1):91～97.1244 28