聚偏氟乙烯微滤膜过滤纯生啤酒性能与滤菌效果研究.pdf

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1、生物程ScienceandTechnologyofFoodIndustry聚偏氟乙烯微滤膜过滤纯生啤酒性能与滤菌效果研究董伦。陆茵(宁波大学海洋学院食品科学与工程系，浙江宁波315211)摘要：研究了指孔状结构和网状结构的亲水性聚偏氟乙烯(PVDF)微滤膜的滤菌性能与膜结构、膜孔径的关系，探讨了生啤酒过滤过程中膜结构、清洗方式对除菌效果和膜过滤通量的影响规律，通过SEM和接触角测定仪表征了微滤膜的结构和亲水性。结果表明：膜的结构对滤菌效果影响不大；O．22p,m数量级的PVDF微滤膜的滤菌效果达到啤酒生产要求；清水清洗和碱、清水、酸、清水连

2、续清洗两种清洗方式对网状结构的PVDF膜影响不大，其平衡过滤通量保持在22-2—22．4L／(m·h)，但碱、清水、酸、清水连续清洗方式更有利于指孔状结构PVDF膜性能的恢复，平衡通量约为40．8L／(m·h)，而同样条件下清水清洗的平衡通量为35．0L／(in·h)。实验数据表明用亲水性的PVDF微滤膜过滤生啤除菌，仅采用清水清洗膜在操作上是可行的。关键词：亲水性PVDF膜，生啤，除菌，性能StudyontheperformanceofPVDFmembranesanditsdegermingeffectforapplicationofdr

3、aftbeerfiltrationDONGLun，LUYin(SchoolofMarineSciences，FoodScience&EngineeringDepartment，NingboUniversity，Ningbo315211，China)Abstract：HydrophilicPoly(vinylidenefluoride)(PVDF)microfiltrationmembraneswithfinger—likestructureandreticularstructurewereusedtofliterbacteria．There

4、lationshipbetweenthestructureandporesize0fPVDFmembranesanditsdegerminqeffectwasstudied．Theinfluenceofmembranestructureandcleanmanneronthedegermingeffectandfiltrationfluxduringdraftbeerfiltrationwasalsoinvestigated．Scanningelectronmicroscope(SEM)andwatercontactanglemeasurer

5、wereusedtocharacterizethemembranestructureanditshydrophilicity．TheresultsshowedthatthedegermingeffectcouldmeettherequirementofdraftbeerwhentheporesizegradeofPVDFmembranewasabout0．22pmforbothfinger—likestructureandreticularstructuremembranes．Therewerenosiqnificantd；fference

6、sbetweenbase—．water—．acid——watercleaningmannerandthewatercleaningmannerontherecoveryofthefiltrationfluxofreticularstructuremembranes．Thedraftbeerfluxforbothofthecleaningwayswasstableto22．222．4L／(m·h)around．Thebase—water—acid—watercleaningmethodwasbeneficialtotheperformance

7、0ffinger—likemembraneswherethedraftbeerfluxwasstableto40．8L／(m·h)．Comparedtothebase—water—acid—watercleaningway，thedraftbeerfluxwasstableto35．0L／(m-h)whenthewatercleaningmethodwasused．Theresultsjndicatedthatthewatercleaningmethodwasavailablefordraftbeerfiltrationdegermingw

8、henhydrophilicPVDFmicrofiitrationmembraneswereusedinperformance．Keywords：hydrophilicPVDFm