电去离子集成过程分级浓缩与纯化电镀镍漂洗废水王玉珍

　61　3　　　　　　　　　　　　Vol.61　No.3　20103　　CIESC　Journal　　　March　2010王玉珍,王建友,卢会霞,王少明,董　恒(,300071):;;:TQ028.8　　　　　　　:A:0438-1157(2010)03-0754-07Successiveconcentrationandpurificationofnickel-electroplatingrinsingwastewaterbyintegratingmembraneprocesswithelectrodeionizationWANGYuzhen,WANGJianyou,LUHuixia,WANGShaoming,DONGHeng(SchoolofEnvironmentalScienceandEngineering,NankaiUniversity,Tianjin300071,China)Abstract:Successiveconcentrationandpurificationofsimulatednickel-electroplatingrinsingwastewaterwascarriedoutbyintegratingmembraneprocesswithelectrodeionization.Theconcentratecompartmentswerefilledwithionexchangeresinstoenhancetheseparation.TheconcentratestreamoftheprimaryEDIprocedurewasoperatedinclosedcircuitcirculation.Theinfluenceofthevolumetricratioofresinsinconcentratecompartmentsontheseparationwasexamined.Itwasfoundthatthebestperformancecouldbeachievedwhenaniontocationresinratioof6∶4wasadopted.WithfeedNi2+concentrationof50mg·L-1andpHof4.25,theNi2+concentrationofeffluentdilutestreamcouldreach2.78mg·L-1whilethatoftheeffluentconcentratestreamwasashighas11171mg·L-1,whichgaveaconcentrationratioofhigherthan220.TheeffluentdilutestreamoftheprimaryEDIwasthensenttothesecondEDIstackfordeepdesalting.Diluteproductwithresistivityof1.6—2.0MΨ·cmwasthenobtained,whichcouldberecoveredaspurewaterforelectroplating.ThemembraneprocessintegratedwithEDIcouldfinditspotentroleforzeroemissionandresourcereuseofheavymetalwastewater.Keywords:electrodeionization;electroplatingwastewater;nickelion　　2009-08-31,2009-10-31。:。:(1985—),,。:(2007AA06Z330);(08ZCKFSH01800)。　　。,。,,(EDI)。　　Receiveddate:2009-08-31.Correspondingauthor:Prof.WANGJianyou,[e-mail]:supportedbytheHigh-techResearchandDevelopmentProgramofChina(2007AA06Z330)andtheSpecialProjectofScience&TechnologySupportProgramofTianjin(08ZCKFSH01800).　,EDI。,,。,EDI。,[1-5]、EDICu2+、Ni2+,H+OH-,H2SO4,EDI。,,。,EDI。,5～14,50mg·L-11800mg·L-1。,[2,6-8],,。,EDI,。:、;;,。[9],EDI。,EDI65.5,52mg·L-13407mg·L-1,Ni2+0.28mg·L-1,12000。,EDI,;EDIEDI,EDI。1　1.1　:EDI,。:D072D296,0.7～0.8mm,。,0.5mol·L-11mol·L-1NiSO448h,Ni2+,SO2-4。NiSO4·6H2O:,。:,12μS·cm-1。1.2　EDIEDI1。1　EDIFig.1　InnercellconfigurationofprimaryEDIC—cationexchangemembrane;A—anionexchangemembrane　·755·　3　　:2　EDIFig.2　FlowdiagramofIMPsystemofEDI　　　EDI,、,。,。,4。,。EDI1,,。EDI4∶6。100mm×300mm,PP。4mm。1.3　2。Ni2+,EDI。EDIEDI,;EDI,。1.4　EDINiSO4·6H2O,Ni2+50mg·L-1,H2SO4pH4.25。EDIEDI,Ni2+3mg·L-1,pH5.00。0.6L。EDI、pH、。TAS-996,Ni2+。2　2.1　,EDI“-(I-V)”“-(R-V)”。,EDI6∶4,、25L·h-122.5L·h-1,EDI、25L·h-115L·h-1。EDI0.25mol·L-1H2SO4,15L·h-1。。5V,2.5V,5min。EDI3(a)、(b)。3,EDI。,。“-”,,[9]。,H+OH-,。EDI,EDINi2+,Ni(OH)2,。3(a),15V。EDI,,22μS·cm-1,EDI。,,。3(b),25VEDI。·756·　　　　　61　2.2　EDI4∶6,15V,7∶3、6∶4、5∶5、4∶63∶7,,,。2.2.1　浓缩室树脂比对膜堆电流的影响　4,0.28～0.38A。,,。,。(∶)5∶54　EDIFig.4　Variationofstackcurrentsversusoperationtime　4∶6,;3∶77∶3,,。6∶4,。,3∶7,,,,。,Ni2+,OH-,,Ni(OH)2。7∶3,2,。:2,Ni2+,;Ni2+,Ni2+,Ni2+。4∶65∶5,2,6∶4(∶),。,。,·757·　3　　:3∶7、4∶6、5∶5、6∶47∶3,0.34、0.52、1.27、1.181.83。,6∶4,1,。。。2.2.2　浓缩室树脂比对浓淡水出水pH的影响　5,,pH。pH,。“-”,。H+,pH;OH-,pH[9]。5　EDIpHFig.5　VariationofoutdiluteandconcentratepHversusoperationtime　3∶7,,H+,pH。4∶66∶4,pH,。pH。H+、OH-,、H+、OH-,H+。5,pHpH2～2.5,H+100。,,H+pH。,EDI,pH。,pH4.5～4.9,,pH2.0～2.6,pH。Ni2+,“-”[9]。2.2.3　浓缩室树脂比对过程分离性能的影响　Ni2+6(a)、(b)。,Ni2+4mg·L-1,Ni2+。1000,Ni2+,。6(a),Ni2+,,。7∶3、6∶4、5∶5、4∶6、3∶7,Ni2+2.89、2.78、3.94、4.164.54mg·L-1,Ni2+8546、11171、8033、82347390mg·L-1。,6∶4,EDI223,4018,。6∶4Ni2+,。EDINi2+NgcNgc=CcoQco-CciQci≈(Cco-Cci)Qci,Cci、CcoNi2+,Qci、Qco。EDINi2+NrdNrd=CdiQdi-CdoQdo≈(Cdi-Cdo)Qdi,Cdi、CdoNi2+,Qci、Qco,Ngc、·758·　　　　　61　Nrdmg·h-1。7,NgcNrd,。。,,,,QcoQci。,Ni2+,Ni2+。Ngc。Ni2+,,Ni2+。。。,,H+,。2.3　EDIEDI、pHNi2+8、9。,EDIpH,1h6.07～6.24,5.0;pH,,2.39,pH。·759·　3　　:9　EDIFig.9　ProductqualityofEDIversusoperationtime　。EDI,2.0MΨ·cm,,1.6MΨ·cm。。Ni2+10h1350mg·L-1,450。,,EDI,EDI,。3　　(1)EDI。Ni2+50mg·L-1、pH4.25,EDINi2+11171mg·L-1,220,EDI1.6MΨ·cm,。(2)EDI。,6∶4,。　　(3)EDI,,,、、,。References[1]　MahmoudA,MuhrL,GrevillotG,etal.Experimentaltestsandmodelingofanelectrodeionizationcellforthetreatmentofdilutecoppersolutions.CanadianJournalofChemicalEngineering,2007,85(2):171-179[2]　DzyazkoYS.Purificationofadilutedsolutioncontainingnickelusingelectrodeionization.Desalination,2006,198(1/2/3):47-55[3]　RozhdestvenskaLM,DzyazkoYS,BelyakovVN.ElectrodeionizationofaNi2+solutionusinghighlyhydratedzirconiumhydrophosphate.Desalination,2006,198(1/2/3):247-255[4]　FengMao,WuZucheng,ChenXuefen.RemovalofmetalionsfromelectroplatingeffluentbyEDIprocessandrecycleofpurifiedwater.SeparationandPurificationTechnology,2007,57(2):257-263[5]　FengXiao,GaoJunsong,WuZucheng.Removalofcopperionsfromelectroplatingrinsewaterusingelectrodeionization.JournalofZhejiangUniversityScienceA,2008(9):1283-1287[6]　SmaraA,DelimiR,ChainetE,etal.Removalofheavymetalsfromdilutedmixturesbyahybridion-exchange/electrodialysisprocess.SeparationandPurificationTechnology,2007,57(1):103-110[7]　DzyazkoYS,RozhdestvenskayaLM,VasilyukSL,etal.Electro-deionizationofCr(Ⅵ)-containingsolution(Ⅰ):Chromiumtransportthroughgranulatedinorganicion-exchanger.ChemicalEngineeringCommu