發酵工業廢液之電凝聚分離特性與污泥之聚電解質

StudyontheIndustrialFermentationWastewaterbyElectroflocculationMethodandItsSludgeConditioningwithPolyelectrolytesWen-JangChenYang-ChuChengHsiu-YingHsuTson-NanChenABSTRACTThispaperdescribestheapplicationofanelectroflocculationandsludgeconditioningmethodforthetreatmentofindustrialfermentationwastewater.Electroflocculationisacombinationoftheprocessesofelectroflotationandelectroprecipitation.Ourelectroflocculationunitconsistsofacontinuouselectrolyticcellwiththecheapestelectrodessuchasironandstainlesssteel.Anionicpolyelectrolytesusedasaflocculantweredosedcontinuouslytoenhancetheremovalrateoftheimpuritiesinwastewater.Thesludgesproducedeitherfromtheelectroflotatedupperphaseorfromtheelectroprecipitatedbottomphasewerefurtherconditionedwithpolymersbyajar-testapparatus.Theinfluenceofshearrateandpolymerdoseontheflocstrength,filterabilityanddewateringperformance,andaverageparticlesizeofsludgeswasinvestigated.Testresultsshowthattheoptimumpolymerdosesfallbetween30-50mg/Lundercorrespondingshearratesof200-300rpm.Itissuggestedthatbothchargeneutralizationandpolymerbridgingmechanismsoperateintheelectroflocculationandsludgeconditioningprocess.Keywords:FermentationWastewater,Electroflocculation,SludgeConditioning,Polyelectrolyte.[1]Mayer,C.,R.Moritz,C.Kirschner,W.Borchard,R.Maibaum,J.Wingender,andH.-C.Flemming,“TheRoleofIntermolecularInteractions:StudiesonModelSystemsforBacterialBiofilms,”Int.J.Biol.Macromolec.,26,3(1999).[2]Matteson,M.,R.L.Dobson,R.W.Glenn,Jr.,N.S.Kukunoor,W.H.WaitsIII,andE.J.Clayfield,“ElectrocoagulationandSeparationofAqueousSuspensionsofUltrafineParticles,”ColloidsSurf.A,104,101(1995).[3]Koren,J.P.F.andU.Syversen,“State-of-the-ArtElectroflocculation,”Filtr.Sep.,32,153(1995).[4]Rubach,S.andI.F.Saur,“OnshoreTestingofProducedWaterbyElectrofloccula-tion,”Filtr.Sep.,34,877(1997).[5]Chen,X.,G.Chen,andP.L.Yue,“SeparationofPollutantsfromRestaurantWastewat-erbyElectrocoagulation,”Sep.Purif.Technol.,19,65(2000).[6]Fukui,Y.andS.Yuu,“RemovalofColloidalParticlesinElectroflotation,”AIChEJ.,31,201(1985).[7]Burns,S.E.,S.Yiacoumi,andC.Tsouris,“MicrobubbleGenerationforEnviro-mentalandIndustrialSeparations,”Sep.Purif.Technol.,11,221(1997).[8]Ibanez,J.G.,M.M.Takimoto,R.C.Vasquez,S.Basak,N.Myung,andK.Rajeshwar,“LaboratoryExperimentsonElectrochemicalRemediationoftheEnvironment:ElectrocoagulationofOilyWastewater,”J.Chem.Educ.,72,1050(1995).[9]Konsricharonern,N.andC.Polprasert,“ElecrochemicalPrecipitationofChro-miumIonsfromAnElectroplatingWastewater,”Wat.Sci.Technol.,31(9),109(1995).[10]Donini,J.C.,J.Kan,J.Szynkarczuk,T.A.Hassan,andK.L.Kar,“TheOperatingCostofElectrocoagulation,”Can.J.Chem.Eng.,72,1007(1994).[11]Campbell,H.W.andP.J.Crescuolo,“TheUseofRheologyforSludgeCharacter-ization,”WaterSci.Technol.,14(6-7),475(1982).[12]Chen,W.-J.,D.-P.LinandJ.-P.Hsu,“ContributionofElectrostaticInterac-tiontotheDynamicStabilityCoefficientforCoagulation-FlocculationKineticsofBeta-IronOxyhydroxidesinPolyelect-rolyteSolutions,”J.Chem.Eng.Japan,31,722(1998).[13]Baskerville,R.C.andR.S.Gale,“ASimpleAutomaticInstrumentforDeterminingtheFiltrabilityofSewageSludges,”J.Inst.WaterPollutionCon-trol,67,233(1968).[14]Brandon,N.P.,G.H.Kelsall,S.Levine,andA.L.Smith,“InterfacialElectricalPropertiesofElectrogeneratedBubbles,”J.AppliedElectrochem.,15,485(1985).[15]Chang,M.-C.,H.-L.Lin,C.-L.Huang,Y.-Y.Wang,andC.-C.Wan,“ConditioningCharacteristicsofKaolinSludgewithDifferentCationicPolyelectrolytes,”ColloidsSurf.A,139,75(1998).[16]Bache,D.H.andE.N.Papavasilopoulos,“ViscousBehaviorofSludgeCentrateinResponsetoPolymerConditioning,”WaterRes.,34(1),354(2000).