膜污染控制及清洗方法的研究

1、天津大學碩士學位論文膜污染控制及清洗方法的研究姓名：李衛(wèi)民申請學位級別：碩士專業(yè)：環(huán)境工程指導(dǎo)教師：張宏偉20070601ABSTRACTMembraneBioreactor(MBR)isacomparablynewtypeofbiologicalreactorthathasattractedgreatattentioninrecentyearsTheadvantagesofferedbyMBRoverconventionalactiv

2、atedsludgeprocess(ASP)includeasmallfootprint，reducedsludgeproductionandSOonIntheexperimentalprocedure，submergedMBRwasusedtotreatmunicipalwastewaterDuringnearlyoneyearoperationperiodfromMay2006toApril2007，theoperationeffe

3、ctswereasbelowTheaverageremovalefficienciesofCODcr，BOD5andammoniawererespectively969％、950％and847％MembranefoulingisoneofthemostimportantfactorsthatinfluencethedevelopmentofMBRTheincreasesofmembranefoulingunderdifferentcon

4、ditionsweremonitoredandmembranefoulingincreaseshowedatwostagetrendwhichwerestableincreasestageandacceleratedincreasestage，undersubcriticalfluxMembranefoulingwasacceleratedwiththeriseofsludgeconcentrationFurthermore，themu

5、ltinomialregressionofmembranefoulingincreasetrendWasmadeandtheexactdecompositiontimeWasobtainedtogivetheoreticalbackgroundtoonlinebackwashingOn—linebackwashingWasmadeeveryfivedaysandthenthetimethatmembranefoulingenteredt

6、hesecondstagewasdelayedTheenergyconsumptionlossduetoovergreatmembranefoulingspeedWasalsoreducedButthereagentintroductionduringon—linebackwashingcouldhaveadverseinfluenceonmicroorganismactivityTheinfluencethatreagentshado

7、nmicroorganismactivityWasreviewedintermsofdehydrogenaseactivityandOURandthetwomethodswerecomparedExperimentalresultshowedwhenNaCl0concentrationWas250ppmtheslightmicroorganismactivitychangewouldnotinfluencesystemoperation

8、，butNaCl0concentrationmorethanl000ppmwouldleadtoconsiderablemicroorganismactivitydeclineMembranefoulingspeedWasSOgreatunderhi【ghsludgeconcentrationthatguidedboardswereaddedtobothsidesofthemembraneteducemembranefoulingMem

9、branecleaningisthefocusofcurrentstudyThroughanalysisofmembraneresistancesunderdifferentconditions，itWasfoundthatcakelayerwhichwouldbeeliminatedbyhighspeedstreamwasthemostimportantfactorofmembranefoulingTheanalysisofthesu