高气泡表面积通量浮选柱气浮除藻的研究

79Vol.7,No.920069TechniquesandEquipmentforEnvironmentalPollutionControlSep.2006陈泉源　朱凌云　　　　　　　　　　M.Salas　　(,200051)　　　　　　(,)　　　　　、,。,、。,、,a95%,。,,,/,/,。　　　　　a　X703　　　A　　　1008-9241(2006)09-0073-05ApplicationofcolumnflotationwithhighbubblesurfaceareafluxforalgaeremovalfromsourcewaterChenQuanyuan1　ZhuLingyun1　M.Salas2(1.SchoolofEnvironmentalScienceandEngineering,DonghuaUniversity,Shanghai200051;2.SchoolofChemicalEngineering,TUBerlin,Germany)Abstract　Removalofalgaeincludingcyanophyta,chlorophytaandeuglenafromsourcewaterisessentialtotheproductionofdrinkingwaterduetosevereeutrophicationoflakesandreservoirs.Thispaperdescribestheflotationcolumnwithhighbubblesurfaceareafluxandtheeffectsofparameterssuchasthedosageofcoagulant,bubblesurfaceareaflux,andcolumnheightontheremovalefficiencyofalgae.Thereasonablearrangementofmulti-spargerscanalsoexcludeintensivedisturbance,whichisunabletobeavoidedintraditionalflotationfacili-tiescausedbyhighsuperficialgasvelocity,andcreatefavorablestaticenvironmentfortheattachmentandfloat-ingofbubble-algaeflocsinthecolumn.Theflotationresultsconfirmedthatthecolumncangeneratesufficientandveryfinebubblesathighsuperficialgasvelocitytoincreasethecollisionpossibilityofbubbleandalgae.Thisnewequipmenthasshowntobecapableofachievingchlorophllaandalgalremovalefficienciesofover95%.Itisconcludedthattheperformanceofcolumnflotationwithhighbubblesurfaceareafluxinalgalremovalfromsourcewaterismuchhigherthanthatofconventionalcolumnflotationorthatoftraditionalsedimentation.Keywords　drinkingwatertreatment;bubblesurfaceareaflux;columnflotation;algae;chlorophylla:2005-12-04;:2006-05-14:(1962～),,,,。E-mail:[e-mail]　　、,。,,,,[1～3]。1/4、,,,;,、,[1～4]。、,。、,--,,、。,,,,,,;,、,,,,“”。7,,(11.8%)[1,4]。,,、。,。,,。、、、、,(),,20%～80%,。,[1～6]。2070,、,40%～80%,90%,30%,70%～80%[1]。,、,,90%[5]。,2:(1),;(2),。,、。1　1.1　(Sb),,(db)2,(Jg),:Sb=6Jg/db:dCpdt=0.25SbEcCpCp;Ec。,(K=0.25SbEc),[7,8]。,,[9,10]。,,,,,,[11]。,3mm,2mm,10～30μm,(6～7×105/m2),、,,、,。(200mm),,,,,/,。,/,。1,300×400mm、、、。100mm,90mm,2500mm。,5mm。,,。200mm。。,,。0.1～0.7MPa,。1　Fig.1　Schematicofcolumnflotationwithhighbubblesurfaceareaflux749:1.2　WANNSEE(),,。a150μg/L(7×107/L),。、,31%,48%,15%;、、6%。2.5μm37%,2.5～5μm41%,5～10μm17%,10μm5%。1.3　(PAC)。PAC,Al2O330%,2%,1%。,100,90%,0.1%。1.4　CCD,,;Olympus-CX41。,,a。a754,[12]。pH,20℃,:(1),,,。。(2),(250r/min,G500s-1)5min。(3)(60r/min,G20s-1),,20min,,,。。2　2.1　,。1600mL/min,1。,1[7],。1　(×10-2m/s)Table1　OperationparametersofcolumnflotationwithonespargerJfJtJgT(min)H(mm)0.400.392.07.52000～25000.1～10.35～10.5～330～50:Jf、Jt、Jg、T、H、、、,10μm95%,Eco∝(dp/db)n,,dp。,,,。,a(2,5%)。40mg/L,a90%,a75.49%。,a94.24%。,。85%,、95%,6O%,90%,a。,,,30mg/L。2　aTable2　Removalofchlorophyllaatdifferentcoagulantdosagesbyflotationorsedimentation　(mg/L)010203040(mg/L)0.51(μg/L)150.39149.60151.71146.95152.03151.78148.53(μg/L)100.5133.7926.416.4711.6511.179.01(%)1071.93——75.49—86.83　　　　36.5178.3983.4489.3592.7288.6394.247572.2　。a2,0.5m2m,a20。a,,。,。,,2m2.5m,a。、、、、、[13]。Ityokumbul[14],()。,,。,,。2.3　。、,。30mg/L,3,(),,Jg≤2×10-2m/s,10～150μm,,75μm,1500s-1(4),a89.72%。,2×10-2m/s,,/,/。Jg3.0×10-2m/s,(1)。2　Fig.2　Variationofflotationindiceswithcolumnheight,,。,Jg3×10-2m/s,1、2、390、8072μm。,。,(Sb)4。,12,,,,3。12000s-1,22200s-1,32500s-1。、。17.86×104/smm2,21.09×105/smm2,31.53×105/smm2。,,。,。3　Fig.3　Flotationdataatdifferentsuperficialgasvelocities4　Fig.4　Relationshipbetweenbubblesurfaceareafluxandsuperficialgasvelocity769:,,(),,,,,,5,32a2,21a3。、,a95.47%,,。5　Fig.5　Relationshipbetweenbubblesurfaceareafluxandtheremovalofchlorophylla3　　、,,。a150μg/L,,a95%。、,,,。,、,。,(3～4×10-2m/s),,,,,,。,。,。[1]..:,1999[2],,,..:,1990[3],..,1989,13(3):201～209[4],,..,2005,24(2):120～123[5]YanY.,JamesonG.Applicationofjamesoncelltechnolo-gyforalgaeandphosphorusremovalfrommaturationponds.In.tJ.ofMiner.Process.,2004,73:23～28[6]ChenY.,LiuJ.,JuY.Flotationremovalofalgaefromwater.ColloidsandSurfacesB:Biointerfaces,1998,12:49～55[7]FinchJ.A.,DobbyG.S.ColumnFlotation.London:Perga-monPress,1990[8]Diaz-PenafielP.,DobbyG.S.Kineticstudiesinflotationcolumns:Bubblesizeeffec.tMineralsEngineering,1994,7(4):465～478[9]HulsB.J.,LachanceC.D.,DobbyG.S.Bubblegenera-tionassessmentforanindustrialflotationcolumn.MineralsEngineering,1991,4:37～42[10]FinchJ.A.Columnflotation:Aselectedreview-PartⅣ:Novelflotationdevices.MineralsEngineering,1995,8(6):587～602.[11].、.:,2002[12]..:,2002.670～671[13]LuttrellG.M.,MankosaM.J.,YoonR.H.Designandscale-upcriteriaforcolumnflotation.Sydney:Proc.18thIMPC,1993,(3):785～791[14]ItyokumbulM.T.Ontheoptimizationofcolumnheigh.tMiner.Metal.lProcess,1996,13:36～4177