基于ptfe中空纤维膜的膜吸收脱氨-研究

《基于ptfe中空纤维膜的膜吸收脱氨-研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、万方数据浙江理工大学硕士学位论文基于PTFE中空纤维膜的膜吸收脱氨研究度和吸收液流速对氨氮传质性能的影响规律。实际废水的中试结果与实验室结果基本一致，去除氨氮效果良好。关键词：PTFE；中空纤维膜；膜吸收；氨氮；传质万方数据浙江理工大学硕士学位论文基于PTFE中空纤维膜的膜吸收脱氨研究StudyonmembraneforstrippingammoniabyusingP耶EhollowfibermembraneAbstractAmmoniaisacommonkindofwaterpollutant,whichisofseriousharmtoh

2、umanhealthandtheecologicalenvironment．Thediversityandcomplexityofammoniawastewaterfromdifferentindustriesbringgreattroubletoammoniaremoval．Traditionalmethodsfarammoniaremovalsuchasphysicalandchemicalmethods，biobgicaldenitrification,whichhaveshortcomings，suchashighenergycomu

3、mptiort,bigcoveringareaandbwefficiency．Membraneabsorptionisanewseparationtechnologycombiningchemicalabsorptionmethodandmembraneseparationtechnology,whichisenergysavhg．coverhgasrmllarea,etc．Thechoiceofmembranematerialshasgreatinfluencesontheremovaleffectofmembraneabsorption,

4、mostofthemembranematerialsalepolypropylene俨P)，polyvinylidenefluoride(PVDF)．HoweverPTFEhasbeenthemostpromisingmembranematerialsduetoitssuperiorhydrophobicity,chemicalresistanceandthermalstability．Inrecentyears,ourresearchgrouphasfabricatedPTFEhollowfibermembranesthrough‘bast

5、e—extrusion-stretching-sintering”method．Inthispaper,PTFEholbwfibermembraneswerepreparedthrough‘baste—extrusion-sintering”method．sixkindsofPTFEhollowfibermembraneswithdifferentstructuresweremadebychangingextrusionheadsizesandslretehingratios，theeffectsofextrusionheadsizesand

6、stretchingratiosonthestructureofPTFEhollowfibermembraneswereinvestigated．Self-mademembranemoduleswerepreparedtocarryoutammoniaremovalexperimemsviamembraneabsorption．Theeffectsofmembranestructure(wallthickness,poresize)andmembranemoduledesign(packingdensity,membranelengtKpla

7、cementmode，runningmode)ontheammoniamasstransferperformancewereinvestigated．Resultsshowthatthemasstransfercoefficientandtheremovalrateincreasewiththedecreaseofwallthicknessandtheincreaseoftheporediameter．Itexistsabestpackingdensitytoi／laketheammoniamaSStransfercoefficiemlarg

8、est,whichalsocanachievehighammoniaremoval．TheammoniamassIransfercoefficientdecreas