D城市污泥电渗脱水实验研究冯源

32520125ActaScientiaeCircumstantiaeVol．32No．5May20121984—[e-mail]*[e-mail]1984—[e-mail]*[e-mail]iae3251081-1087*3100582011-06-222011-10-272011-10-31．．、、．．．．0253-2468201205-1081-07X703ALaboratorystudyonelectroosmosisdewateringofsewagesludgeFENGYuanZHANLiangtong*CHENYunminMOEKeyLaboratoryofSoftSoilsandGeoenvironmentalEngineeringZhejiangUniversityHangzhou310058Received22June2011receivedinrevisedform27October2011accepted31October2011AbstractElectroosmosisdewateringisamethodwhichcanremovewaterinsludgeeffectivelytoachievevolumereduction．Thispaperpresentedalaboratorystudyonelectroosmosisdewateringofsludgewithpurposely-designedapparatuses．Duringthedewateringteststhechangesofelectroosmoticflowratevoltagegradientandresidualwatercontentweremeasured．Onthebasisofthemeasurementstheinfluencesofvoltagegradientelectrodedistanceandtreatingtimeonthedewateringprocesswereanalyzedandtheattenuationmechanisminthedewateringeffectwasexplained．Itwasfoundthattheelectroosmosisdewateringgraduallyextendedfromtheanodetocathodeandafteracertaintimethedewateringceasedinthedewateredsectionandtransitedtothesubsequentundewateredsection．Electricalresistanceofthedewateredsectiongraduallyincreasedandinresponsethevoltageleftfortheundewateredsectiondecreased．Boththeelectroosmoticflowrateanddewateringeffectweredeterminedbythevoltagegradientoftheundewateredsludge．Thephenomenonresultedinsignificantattenuationinelectroosmoticflowanddewateringeffectovertimeandnon-uniformdistributionofresidualwatercontentalongthedewateringdirection．Theoveralldewateringeffectandthecorrespondingenergyconsumptionincreasedwithanincreaseintheappliedvoltage．Thedewateringefficiencywouldbeimprovedwithashorterelectrodedistance．Keywordssludgeelectroosmosisdewateringelectroosmoticflowratedewateringeffectvoltagegradientresidualwatercontent1Introduction20102170t80%．．10－4mBrendan2006Glendinningetal．2007．．．veHelmholyz-SmoluchowskiHunter198132ve=εζiη1vem·s－1εF·m－1ζZetaVηPa·siV·m－1．qem3·s－1qe=venA=εζnηiA=keiA2nAm2kem2·V－1·s－1．Mahmoudetal．2011YuanandWeng2003Yangetal．2005Fourieetal．2007Glendinningetal．2007Raatsetal．2002Hamiretal．2001Yangetal．2005、Yuanetal．2003．．．2Materialsandmethods2．11．1138mm76mm8cm16cm．1mm、．200g·m－2．2．1Table1Maincharacteristicsofthesludge/g·cm－3pH82．1%28．72%1．056．42pHNY/T1377—2077．1Fig．1Experimentalapparatusforelectroosmosisdewatering2Table2Distancesamongvoltagemeasuringprobesofthemiddlesizecell/cmS1S2S3S4S5S63．22．42．72．52．72．52．23123Table3Theexperimentalscheme/cm/V·cm－1/minT182160T284140T386100T488100T58240T68440T7164100T8166100T91415T101615T1116430T121647028015、．2minI0．01g2minqeT7、T8S1—S6i．w．3Results3．1T1—T4100minqe0.05mL·min－1Iqe2．qeIT1I、qe50%T480%．qe、2ke7．18×10－5cm2·V－1·s－10．24～1．38×10－5cm2·V－1·s－1Yuanetal．2003、1．5×10－5cm2·V－1·s－1Glendinningetal．2007．qe2ke．2T1—T4Fig．2ChangesofelectricalcurrentandflowratewithtimeforT1—T4T7、T816cm100minT9、T101cmIqe、15min．T7—T10Iqe3T1—T4Iqe．T7T9、T8T10Iqe．3T7—T10Fig．3ChangesofelectricalcurrentandflowratewithtimeforT7—T104Fig．4Residualwatercontentprofilesinsludge3．2T1—T64a．．．T5、T6T1、T240minT1、T2140min380132．．pHAcaretal．1993．ZetapHLelandetal．19972、pH．T7—T124b．T7—T126cm4b．T7、T8T8、．T11、T12T7T11、T12T730min70min．30min、70min、100min0．5cm、2cm3．5cm、．0．5cm2cm30min70min72．1%73．4%．．．．．3．3T7、T8S1—S655T7、T8a、bFig．5ChangesofvoltagegradientandelectricalresistancewithtimeforeachsectioninT7＆T848015．S1．S270minS2．、．．5．Alshawabkeh、Alshawabkehetal．1996．、T7T8．6Fig．6Relationshipbetweenflowrateandvoltagegradientofundewateredsludge、．T7、T8S3—S6qe62ke'6．94×10－5cm2·V－1·s－17．18×10－5cm2·V－1·s－1．．ke、．、．7、T1—T4、T7T8T7T8100min、T1270minS3—S6T7T83．5cm、T122cm．．、、．7Fig．7Relationshipbetweenvoltagegradientofundewateredsludgeandresidualwatercontentnearthedewateringboundary4Discussion4．1580132．8．T1、ww1、S1i1i'、qe'．S1T2S2i'w2w1i2i″qe″．、．．、16cm1cm．8Fig．8Electroosmosisdewateringprocess4．2、．．EE=U∫fIdt3UfI．4T1—T4100minT9、T1015minm3．．．．4Table4Energyconsumptionandaveragewatercontent/V·cm－1/kWh·m－3T1—T4214．3780．1%8cm450．6278．1%694．4676．2%8145．6573．1%T9、T1049．9373．8%1cm619．0571．2%5Conclusions1ke7．18×10－5cm2·V－1·s－12～8V·cm－182%74．9%～62．2%．268015．．3、．．4．．．1972—、[e-mail]＆Technology27132638-2647AlshawabkehANAcarYB．1996．Electrokineticremediation．IItheoreticalmodelJ．JournalofGeotechnicalandGeoenvironmentalEngineering1223186-196BrendanCO．2006．GeotechnicalpropertiesofmunicipalsewagesludgeJ．GeotechnicalandGeologicalEngineering24833-850FourieABJonesDGJonesCJFP．2007．DewateringofminetailingsusingelectrokineticgeosyntheticsJ．CanadianGeotechnicalJournal442160-172GlendinningSLamontJJonesC．2007．TreatmentofsewagesludgeusingelectrokineticgeosyntheticsJ．JournalofHazardousMaterials1393491-499HamirRBJonesCClarkeB．2001．Electricallyconductivegeosyntheticsforconsolida