电絮凝电气浮技术除藻过程中各参数的优化

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Optimizationofparametersintheelectrocoagulation-electroflotationprocessforremovingalgaeGaoShanshan,ZhangHui,YangJianyu,DuMaoan,TuGang(StateKeyLaboratoryofUrbanWaterResourceandEnvironment,CollegeofUrbanEnvironmentalEngineering,HarbinUniversityofTechnology,Harbin150090,China)-,,,,(,150090)[]。,-。、、pH、、-。,:pH。,,。[];;[]X524[]A[]1005-829X(2010)12-0058-04Abstract:Theincreasingeutrophicationhasledtotheoccurrenceofalgaeblooms,whichisanurgentenvironmentprobleminChina.Microcystisaeruginosaisusedastargetalgae.Thehighlyconcentratedalga-containingwastewateristreatedbyelectrocoagulation-electroflotationtechnique.Theeffectsofcurrentdensity,electrolysistime,initialpH,settingtimeandelectrodegaponalgaeremovalefficiencyareinvestigatedbymeansoforthogonaltest.There-sultsshowthatthesequencesofinfluentialfactorswhichaffectthealgaeremovalefficiencyareasfollows:electroly-sistimecurrentdensitypHsettingtimeelectrodegap.Inaddition,whenCl-arepresentintheECF,algaere-movalcouldbeenhancedbygeneratedactivechlorine.Keywords:electrocoagulation;electroflotation;Microcystisaeruginosa[](2008ZX07211-007)3012201012IndustrialWaterTreatmentVol.30No.12Dec.,2010〔1〕。,、,。,、、。,-。,-:,;,〔2〕;1、、,,,。,-,,、;、,-,〔3〕。-、、、,〔4-6〕。-,,。,Cl--。58——2010-12,30(12)11.11。1L(10cm,16cm),,60cm2。(,DH1715E-4)。(,85-2A),200r/min。(21±2)℃。1.2(FACHB-977),。、,3~7μm。BG11〔7〕,。:(25±1)℃,3000Lux,12∶12。1.3,1L。,7(),8×108~9×108L-1。pH0.1mol/LNaOH0.1mol/LH2SO4。,5cm。Cl-,7(0.45μm)Cl-,Cl-。(BX51Olympus,),。a〔8〕。(FDA)〔9〕。22.1-,(21±2)℃,8×108~9×108L-1,pH、、、。1。pH6.5~8.5,pH-,pH5~9。-,,,,,;,,,-2,5~30min,0.5~6mA/cm2。,,,-,,,,5~30min。-,,,,,,1~5cm。2。2,-:pH。:30min、6mA/cm2、20min、pH6、2cm。,,100%。-,2:(1)Al3+,。(2)H2,。,-。Faraday,Al3+1pH/min/min/(mA·cm-2)/cm15550.5126101012371515234820203459303065,:-59——2010-12,30(12)(),,。,,,,。,pH。k,pH,pH〔10〕。pH5~7,〔Al(OH)2+Al(OH)2+〕。,。pH,〔Al(OH)4-〕。,。、,。20min。,-,,,。,,。2.2Cl--Cl-,Cl--。0、1、3、5、8mmol/LNaCl。:pH=7,2mA/cm2,30min,20min,1cm,1×109~1.5×109L-1,a247~139mg/m3。Cl--2。2,-,Cl-a。Cl-5mmol/L,aCl-。Cl-5mmol/L,a99%。,Cl-〔11〕,Al3+,;Cl--Cl2、HClOHClO3,(1)~(4)〔12〕。Cl-1、3、5、8mmol/L,0.21、0.23、0.23、0.24mg/L(2)。,,。Cl-8mmol/L,a。Cl-Al(OH)3,AlCl3,,〔13〕。2Cl-→Cl2+2e-(1)2pH/min/min/(mA·cm-2)/cm/%15550.5111.12510101265.63515152380.34520203493.555303065100.0665103557.87610156195.68615200.5269.89620301388.71063052494.81175151416.712710202579.313715303196.81472056292.115730100.5360.11685206367.817810300.5440.61881551538.119820102184.920830153296.52195302237.32291053350.123915106475.124920150.5550.425930201161.7k170.138.157.246.470.0k281.366.268.754.272.3k369.072.067.975.369.4k465.681.974.478.964.1k554.982.672.786.165.181.382.674.486.170.054.938.157.246.464.1R26.444.517.239.75.960——2010-12,30(12)[](1981—),。:15904610565,E-mail:gsjy_2010@163.com。[]2010-08-02()Cl2+H2O→HClO+H++Cl-(2)HClO+OH-→H2O+ClO-(3)12ClO-+6H2O→8HCl+4HClO3+3O2+12e-(4),FDA。〔9〕,FDA,,,,。,,,;Cl-,,,,,〔14〕,;Cl-,,,。K.P.Drees〔14〕,。。。,,0.2mg/L,,。3-,,:pH。:30min、6mA/cm2、20min、pH=6、2cm。,100%。,Cl-。,-。[][1],,,.[J].,2009,22(18):11-15.[2]LaiC,LinS.Treatmentofchemicalmechanicalpolishingwastewaterbyelectrocoagulation:systemperformancesandsludgesettlingchar-acteristics[J].Chemosphere,2004,54(3):235-242.[3],,.[J].,2002,20(2):30-32.[4],,.-()[J].,2007,27(10):51-54.[5],,,.[J].,2009,25(15):100-102.[6]EssadkiAH,BennajahM,GourichB,etal.Electrocoagulation/electroflotationinanexternal-loopairliftreactor-applicationtothedecolorizationoftextiledyewastewater:Acasestudy[J].ChemicalEngineeringandProcessing,2008,47(8):1211-1223.[7]XuYunfeng,YangJi,QuMingming,etal.StudyofMicrocystisaeruginosainhibitionbyelectrochemicalmethod[J].BiochemicalEngineeringJournal,2007,36(3):215-220.[8].[M].4.:,2002:177-179.[9].[J].,1989,6(1):127-128.[10]CanizaresP,MartnezF,JimnezC,etal.Coagulationandelectro-coagulationofwastespollutedwithdyes[J].EnvironmentalScienceandTechnology,2006,40(20):6418-6424.[11]LeeWJ,PyunSI.Effectsofhydroxideionadditiononanodicdis-solutionofpurealuminiumchlorideion-containingsolution[J].ElectrochimicalActa,1999,44(23):4041-4049.[12]YildizYS,KoparalAS,KeskinlerB.EffectofinitialpHandsup-portingelectrolyteonthetreatmentofwatercontaininghighcon-centrationofhumicsubstancesbyelectrocoagulation[J].ChemicalEngineeringJournal,2008,138(1/2/3):63-72.[13]ChenXueming,ChenGuohua,YuePL.Separationofpollutantsfromrestaurantwastewaterbyelectrocoagulation[J].SeparationandPurificationTechnology,2000,19(1/2):65-76.[14]DreesKP,AbbaszadeganM,MaierRM.Comparativeelectro-chemicalinactivationofbacteriaandbacteriophage[J].WaterRe-search,2003,37(10):2291-2300.———,,,.CN101560029···············································,。:(1)。,10~14mg/L,300r/min0.7min,100r/min4min,60r/min10min。(2)。55~70min。(3)。,。(4)。0.85~0.95mg/L。pH、、,。(),:-61——

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