新型聚乙烯醇载体的设计、制备及其固定化污水处理系统的构筑研究

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1、兰州大学博士学位论文新型聚乙烯醇载体的设计、制备及其固定化污水处理系统的构筑研究姓名：白雪申请学位级别：博士专业：化学高分子化学与物理指导教师：李彦锋20100501AbstractThepreparationsofpoly(vinylimmobilizationandtheirimprovedimmobilizedmicroorganismbyPVAalcoh01)(PVA)carrierformicroorganismmethodsareintroduced．Theprocessesoncarderforwastewatertreatme

2、ntisreviewed．TheresearchorientationofPVAcarrierpreparationanddevelopmentprospectsinwastewatertreatme．ntarepointedout．NanoscaleFe”wasimmobilizedinandonPVAmicrospheresbytheinversesuspensioncrosslinkedmethod．TwodifferentsizesofFe”／PVAmicrospheresweresynthesizedinthepresenceand

3、absenceofdispersant．ThenitrobenzenemB)reductionreactionsfollowedpseudo．first．orderkinetics．Thenormalizedsurfacerateconstants(ksA)valuesweredeterminedtobe0．162Lh_1m-二forL．Fe”／PVAmicrospheres，0．098Lh～m-ZforS．Feo／FVAmicrospheres，and0．023Lh-1m1fornanoscaleFeuparticles．Furthermo

4、re，withtheanalysisoftheproductsbyGC．MS，possiblereductivepathwaysOfNBbvFeu／PVAmicrospheresweresuggested．Therecoveryratesofironinmicrospheresweredeterminedtobe81．17％forlargeFe”／PVAand60．31％forsmallFeu／PVA。MacroporousPVAfoamusingepichlorohydrinascrosslinkingagentwasinvestigate

5、d．Theaveragemolecularweightamongcrosslinks，crosslinkingdensity，andmeshsizewasdeterminedthroughtheequilibriumswellingtheory．Thecharacterizationoffoamswitlldifferentcrosslinkingratioswasalsoinvestigatedbytestingthermalproperties，specificsurfaceareas，anddiffusioncoefficients．T

6、11ebiomassdensitiesandactivityyieldsweremeasuredbydetectingproteinconcentrationandoxygenuptakerate．TGandDSCtestsshowedanincreaseinthermalstabilityandadecreaseinpolymericcrystallinitywithincreasingcrosslinkingratio．Thebiomassdensitiesincreasealongwiththeincreaseinthecrosslin

7、kingratio．withthehighestvalueshownat0．0638士0．0093gVSSg～carrier．However,theactivityyieldsdecreasewiththeincreaseinthecrosslinkingratio，showingthehighestvalueat69．38％．ThecrosslinkedPVAfoam(CPVAncarrierdemonstratedbetterchemicalandthermalstability．aswellas1argerspecificsurface

8、areaanddiffusioncoe伍cientsthanthetraditionalPVA(TPVA)carrier．Nitrifyingbacteriawer