废水膜生物工艺处理中膜污染与膜清洗技术的研究

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1、东南大学硕士学位论文废水膜生物工艺处理中膜污染与膜清洗技术的研究姓名：夏明芳申请学位级别：硕士专业：材料工程指导教师：张征林;张利民20030901东南大学硕士学位论文Abstract础spaperstudiedthedevelopinghistory,thecharacteristics，themechanismandtheapplicationofthemembranebioreactor(MBR)technology．TheinfluenceofthemembranefoulingwasalSOsummarized．BYt

2、estingthemembranefoulingcharacteristicsofvariouskindofMBR(suchastheflatMB＆thehollowfiberMBRthecapillarytubeMBR)underdifferenthydromechanicalconditions，welearnedtheinfluenceofworkingtime，theprocessingpressuretothemembranefouling．ThemethodstocontrolandwipeOffthemembran

3、efoulingwereoptimized．ThedesignofaflatⅣ略RWascarriedouttotreatthepracticalindustrialwater．Themainresultsareasfollowing：1．Theoperationofthescparatecapillarymembrane，separatehollowfibermembraneandtheflatmembranemodulefitthemodelofsludgeconcentrationcontrolledmembraneflu

4、xdecrease．Themembranefluxdecreasewiththesludgeconcentrationincreases．Thereisa109arithmierelationbetweenthesludgeconcentrationandthevelocityofthemembranefluxdecrease．AddingzeoliteinthewaterCancausethemembraneflaxtoincreasecomparatively．2．Therearethreemomentsinitschang

5、eofmembraneblockageasfarasaflatMBRwasconcerned．Atthebeginning．theresistanceremainedinalowlevel；thenitroserapidlywiththefoulingofthemembrane；inthethirdmoment，thesludgeblockWasconstantlywipedoffbyitsgravityandtheaeration，theresistanceswung．Attheendoftheoperation，theres

6、istancecausedbythesludgeblockaccountforupper3／4thetotal．3．ForthecapillaryMBR．in．reversewashbyNaClOismoreeriectivethanbywater,butisalSOmoreexpensive．ForthehollowfiberMBR，washbyNaClOiSoptimal．whileotherreagentssuchasNaOHandHClarealsoeffective．FortheflatMBR．themechanica

7、lfrictioncanobtaingoodresult．4．Tostudytheeffectofin—versewashbydifferentreagents，weselectthehollowMBRt0dofurtherresearch．theresultisarrangedfromthebesttotheworstasfollowing：1：10disinfector,1：20NaCl0，0．5％NaOH，1％H202，0．5％HCI．Thetemperaturecanaffecttheresultgreatly．Abet

8、terresultwillgetinahighertemperature．Themixtureofcertainkiridofreagentscanbeusedtoachievethepurpose·5．TheflatME；Rhasbeenusedinaprac