36617.減壓膜蒸餾濃海水脫鹽及膜污染研究_第1頁(yè)
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1、天津大學(xué)碩士學(xué)位論文減壓膜蒸餾濃海水脫鹽及膜污染研究姓名：王麗申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化學(xué)工程指導(dǎo)教師：李保安20090501ABSTRACTInrecentyears，theproblemofthesustainabledevelopmentondesalinationhasbecomeallincreasingconcernThefocusisonmarinepollutionandmarineecologicalproblemsc

2、ausedbyconcentrationseawaterwhichisdisposedafterdesalinationprocessnecomprehensiveutilizationofchemicalresourcesonconcentrationseawaterhasbecomethehotresearchiSSUCinthemajorcountriesInthispapertheexperimentsusedtheseawat

3、erofBohaiasresearchobjectAdeepandsystematicstudyondesalinationmechanismofsaltsolutionandseawaterwouldbeimplementedbasedonthevacuummembranedistillationprocessMembranemodulesusedintheexperirnentwereselfmadepolypropylenehol

4、lowfibermembraneFirst，thepurewaterexperimentofvacuummembranedistillationhadbeenimplementedtoknowtheimpactofthesinglefactoronmembranefluxThen也estudyfocusedonthedesalinationmechanismoftheVMDandDCMDprocessTlleresultsshowedt

5、hatintheVMDprocess，thefluxincreasedwiththeliquidtemperature，vacuulndegreeandthevelocitybutthemechanismandlawsweredifferentThereasonofthefluxdeclinecausedbysalinityincludedthreeparts：thesalinityonthemembranesurfaceledtoth

6、edropofthesaturationvaporpressureoftheliquid；salinityledtOtheconcentrationpolarizationeffectandaffectedthetemperaturepolarizationeffect；salinityledtOtheliquidnaturechanged，includingviscositydensityspecificheatcapacityhea

7、ttransfercoefficientandSOonStudyalsofoundthatinacertainrangeofvacuumdegree，theeffectofthesalinityonthefluxwaslessanditisveryimportantintheindustrialdesignandapplication；Thevacuunlmembranedistillationisbetterthanthedirect

8、contactmembranedistiUationonthedeepconcentrationanddesalinationprocess，andithasmoreindustrialprospectIntheexperimentofVMD，discussedthedifferentpre—treatmentoftheseawaterandthroughtheexperimentsultimatelydeterminedthebest

9、pre—treatmentoperationofMDprocess，microfdtration，thehardnessremoval，thepHvalueadjustInthispretreatmentprocesstheremovalrateofthehardnessachievedabout95％Throughanumberofcontinuousoperationexperiment，wecallseethattheincrea

10、singsalinityturbidityhardnessofliquidcaused也eattenuationoffluxThefluxdeclinedwith也esalinityincreasingTheturningpo血offluxdeclineonseawaterafterpretreatmentisabout13％Afterthedecline，thefluxkeptat24kg／(m。車(chē)h)，andthedesalinat

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