您好,欢迎访问三七文档
当前位置:首页 > 建筑/环境 > 工程监理 > 超声振动强化膜分离过程机理的研究芮延年
芮延年 郭旭红 刘文杰 李军涛(,215021) ,。,,、。 ResearchonmechanismofmembraneseparationprocessundertheroleofsupersonicvibrationRuiYannian GuoXuhong LiuWenjie LiJuntao(MechanicalandElectricalEngineeringCollege,SuzhouUniversity,Suzhou215021)Abstract Thephenomenonofconcentrationpolarizationinmembraneseparationprocessisoneofthemainfactorstoweakentheeffectofmembraneseparation.Inthispaper,weexploreawaytostrengthenthemembraneseparationprocessundertheroleofsupersonicvibration.Wefirstsetupitsdynamicmodel,thenmakefurtherstudyonitsstrengtheningmechanismbysomeexperiments.Allwedidwillfindanewwaytostrengthentheeffectofmembraneseparationeffectivelyandeconomically.Keywords concentrationpolarization;supersonicvibration;strengtheningthemembraneseparationpro-cess1 ,,。,,。,,,,,。,,。,,。,,,、、。,,;,,。,,,,。、。2 ,,。,。,,,(bulkflow),,,:“”(concentrationpolarization)。。,1[1]。36Vol.3,No.620026TechniquesandEquipmentforEnvironmentalPollutionControlJun.,20021 :Jc+Ddcdx=JcP(1):Jc-(m3/m2·h);D-;c-(mg/L);x-(m);Jcp-(m3/m2·h)。:x=0,c=cm;x=δ,c=cm。(1),:lnCm-CpCb-Cp=JδD(2) Cm-CpCb-Cp=exp(JδD)(3)DδK,:K=Dδ(4):Rm=1-CpCm(5)(3):CmCb=exp(JK)Rm+(1-Rm)exp(JK)(6):Cm-(mg/L);Cb-(mg/L);Rm-;Cm/Cb-。(6):J,RmK,。Rm=1、Cp=0,(3):CmCb=exp(JK)(7)(3)(7)。,J,。sherwood(sh),:sh=kdhD=aRebSccdhLd =adhvubvDcdhLd(8):dh-(m);Re-;v-(m/s);u-(m2/s);L-(m);a,b,c,d-,b,c,d1。(8),kv、D、、。,。,Jk。3 ,、。。,。,,t()x:x=x0sin2πft(9):x-(mm);x0-(mm);f-(kHz)。(9)t,:v=dxdt=V0cos2πft(10):v0=2πfx0—(m/s)。,,;。,patf。443pa=pAsin2πft(11):pa-(dB);pA-(Hz);。A,dx,:ED=1/2mv20=1/2(ρAdx)Av20(12):Ed-(J);ρ-(kg/m3);dx-;m-(kg);A—(m2)。2 (12),En:En=1/2ρAxv20(13),:E=1/2ρv20(14)C,:I=EC=1/2ρv20vs(15):I-(W/m2);vs-(m/s)。3 v0pa,paCDEF[2]。paCDEF,:(ρ×A×dx)(vcdx)=pa×Av=papvsv0=pApvs(16)(16)(8)(sh):sh=kdhD=a(dhvpapvs)b(vD)cdhL)d(17),,。4 4.1 ,1m2,(δ=1.5mm)。,4。4 4.2 (1/6),COD=800—1200mg/L,pH=9.5—11,250—500。,,。1.5—1.8MPa,1.3—1.5MPa,4—5L/s,18—50℃;92%—95%,COD78%—90%,40—45L/m2·h,10—12h。(),、。5、6、7、8。:(1)5,,10—12h。,,;15kHz,;456:5 6 7 8 25kHz,。(2)6,25kHz,。,35kHz,,40kHz,,。50kHz,。,。(3)7,40μm。(4)8,80W/m2。,,。、。,。5 :(1),,;(2),;(3),15kHz,,,,20—25kHz;(4),40μm;(5),,60—80W/m2;(6)。[1]Mulder,M.H.V.Polarizationphenomenaandmembranefouling.In:Eds.Noble,R.D.,Stern,S,A.MembraneSeparationTechnology,PrinciplesandApplications.Elsevi-er,Amsterdam,1993,[2]..:,1999(责任编辑:郑晓梅)463
本文标题:超声振动强化膜分离过程机理的研究芮延年
链接地址:https://www.777doc.com/doc-6547556 .html