膜分離技術(shù)在L-乳酸分離中的應(yīng)用.pdf

1、合肥工業(yè)大學(xué)碩士學(xué)位論文膜分離技術(shù)在L乳酸分離中的應(yīng)用姓名：唐曉明申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：農(nóng)產(chǎn)品加工及貯藏工程指導(dǎo)教師：姜紹通20100401ApplicationofMembraneSeparationTechnologyinLLacticAcidSeparationABSTRACTLlacticacidasanimportantlygreenplatformcompounds，hasgreatapplicationprospectI

2、t’SgreatlysignificanttosolvethekeytechnologyintheseparationofLlacticacidforstrengtheningthecomprehensiveutilizationofrenewableresourcesandenhancingenvironmentalprotectionInviewofmembraneseparationtechnologywithnon—phase，

3、lowenergyconsumption，doesnotdestroybiologicalactivityandthecharacteristicsofeasyoperation，thispaperadoptsmembranecombinedprocesstodealwithL—lacticacidfermentationbrothMembranefluxattenuationandmembranefoulingarethemajorp

4、roblemsforthemembraneseparationprocessLlacticacidfermentationbrothpretreatmentprocesseswerestudiedteducemembranefluxattenuationandmembranefouling，suchasflocculationsedimentationandactivatedcarbondecolorizationUltrafiltra

5、tionandreverseosmosismembranesoperatingconditionswereoptimized，themathematicalmodelsbetweenmembranefluxandoperatingparameterswereestablished，themechanismofmembranefoulingwasinitiallyexplored，thebestmembranecleaningcondit

6、ionsweredetermined(1)Thefloceulation—sedimentationprocessconditionswereoptimizedbythecombinationofsinglefactorandorthogonalexperimentsTheresultswereasfollowing：thedosageofcalciumhydroxidewas45％o，thedosageofactivatedcarbo

7、nwas75％o，thedosageofmagnesiumsulfatewas3‰，floeculationtemperaturewas70℃andflocculationtimewas45minUndertheseconditions，theremovalrateofbacteriawas9948％，theremovalrateofproteinwas8442％，theremovalrateofresidualsugarwas3980

8、％andlacticacidlOSSratewas188％(2)Comparedtogranularactivatedcarbon，thepowderedactivatedcarbonwasbetterforL1acticaciddeeolorizationThemathematicalregressionmodelsbetweenthediscolorationtotalefficiencyrateanditsinfluencingf

9、actorswereattainedbythecombinationdesignofquadraticorthogonalrotationbasedontheresultsofthesinglefactordesignTheoptimumprocessparametersfordiscolorationtotalefjcicieneyratewereobtainedasthedosageofactivatedcarbon0318％，di

10、scoloringtemperature4318℃anddiscoloringtime1883minAnoptimumrangeunder95％probabilityofthediscolorationtotalefficiencyratemorethan70％couldbesummarizedforthedosageofactivatedcarbon，discoloringtemperatureanddiscoloringtimeat