混凝-中空纖維膜微濾工藝處理微污染地表水及出水系統(tǒng)水力學(xué)計算的研究.pdf

1、天津大學(xué)碩士學(xué)位論文混凝中空纖維膜微濾工藝處理微污染地表水及出水系統(tǒng)水力學(xué)計算的研究姓名：張穎申請學(xué)位級別：碩士專業(yè)：環(huán)境工程指導(dǎo)教師：顧平2001.12.1ABSTRACTWaterresourcesbeingmoreandmoreseriouslypolluted，theconventionalwaterhcatmentprocesscannolongermeetthemoreandnlorestrictstandardofdrin

2、kingwarerThereforeitbecomesurgenttodevelopalternativemeanstomakefulluseofmicropollutedsurfacewaterUndersuchcircumstances，amobileintegrativedevicethatbasedonIabscaleresearchwasdesignedandoperatedItwasusedtopurifymicropoll

3、utedwaterquicklyintheCaSeoffieldoperationsornaturaldisasters，Aprocessintegratedwithcoagulation，powderedactivatedcarbon(PAC)adsorptionandmicrofiltration，SO—calledPACMCRwasstudiedinthisresearchonitsabilitiesandmechanismsof

4、removingorganicmicropollutantsAtthesametimethedevicewasoptimizedforitsindustrializationDuringthewholeoperationofPAC—MCR，theaverageremovalefficienciesofCODMn，UV254，UV410andNH3一Nwere6944％，6052％，9033％and5557％respectively，wh

5、ileduringthesteadyoperatingstage，theyreached7147％，6192％，9298％and6089％respectivelyTheaverageturbidityoftreatedwaterwas07NTU，priortotheNationalSanitationStandardsforDrinkingWater(3NTU)Inthecaseofnodisinfectionstotalbacteri

6、aof112CFU／mLintreatedwatercouldbeexpectedtomeettheNationalSanitationStandardsforDrinkingWaterfl00CFU／mL)Fromtheresultsoft11etest，itcalnetoaconclusionthatPAC—MCRwaspreferablefortreatingmicropollutedsurfacewater，especially

7、consideringitsflexibilityinthefieldInthelaterstage，organicsremovalmechanismswerediscussedbymearlsofanalyzingorganicsmolecularweightsdistributionWhilsttheremovalefficiencyofeachunitprocessinPAC—MCRwasalsodiscussedandcompa

8、redwiththeirintegrationTheresultsshowedthattheorganicswithmolecularweightslessthan1kwerenotremovedefficientlybyPAC—MCREvenmore，organicsinthisrangemightbeincreasedbycoagulationAlthoughPACdosingcanimprovethequalityoftreate

9、dwatertosomeextent，organicsconcen仃atiOilinthisrangewasstillhighFortunatelyorganicsinotherrangesofmolecularweightswereremovedefficiently，andtheirconcentrationsintreatedwaterwerekeptlowTherefore，howtoincreasetheremovaleffi

10、ciencyoforganicswithmolecularweightslessthanlkwasoneofourfocusesinfurtherresearchAnotheremphasisofthisresearchwashydraulicscalculationoftheoutletsystemwhichhelpedtoguideoptimaldesignandoperationItwasshowedthatkeepinghigh

11、erwaterleveldifferenceplayedanimportantroleinavoidingfluxdecline，AndthereasonwhytheflowratecouldnotachievethedesignvaluewasthehighlossofwaterpotentialthroughtheoutletsystemMeanwhile，somedisadvantagesofPAC—MCRwerefound，an