Electrochemical Technologies in电化学技术

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1、ElectrochemicalTechnologiesinWastewaterTreatmentGuohuaCHENDepartmentofChemicalandBiomolecularEngineeringTheHongKongUniversityofScienceandTechnologyEcoAsiaConference(29/10/2008)WaterPollutionImpactsWastewaterTreatmentTechniquesCoagulationSedimentationtoremoveparticles

2、FlotationFiltrationBiologicalprocessesAdvancedoxidationtoremoveorganicAdsorptioncompoundsMembraneprocessesElectricityIsNotaStrangerElectrochemicalmethodsElectrodepositionElectrocoagulationHighefficiencyElectroflotationEasyoperationElectrooxidationCompactfacilitiesEl

3、ectrodisinfectionElectroreductionElectrodepositionforheavymetalrecoveryMn++neM-+neMn+MElectrocoagulation•GeneratingcoagulantelectricallyAl–3eAl3+Fe–2eFe2+•Sludgefloatedbyhydrogengas2HO+2eH+2OH-22ApplicationsofElectrocoagulation•Suspendedsolids•Oil&greaseFacilitiesR

4、equired•AlorFeplatesaselectrodes•DCpowersupply•PumpingfacilityElectrocoagulationunits+-+-(a)Horizontalflow(b)VerticalflowThealuminumdemandandpowerconsumptionforremovingpollutantsfromwaterPollutantUnitquantityPreliminarypurificationPurificationAl3+,mgE,Wh/m3Al3+,mgE,W

5、h/m3Turbidity1mg0.04–0.065-100.15–0.220-40Colour1unit0.04–0.110-400.1–0.240–80Silicates1mg/SiO0.2–0.320-601-2100-2002Irons1mgFe0.3–0.430-801–1.5100–200Oxygen1mgO0.5-140-2002-580-8002Algae10000.006–0.0255-100.02–0.0310–20Bacteria10000.01–0.045-200.15–0.240-80Electrofl

6、otation•Generatinggasbubbleselectrically2HO-4eO+4H+222HO+2eH+2OH-22•Gasbubblesattachingtoflocs•FloatingtotopofwatersurfaceEconomicparametersintreatingoilyeffluentsTreatmenttypeEFDAFIFSettlingBubblesize,m1-3050-1000.5–2Specificelectricityconsumption,30-5050-60100-15

7、050–100W/m3Airconsumption,m3/m3water0.02–0.061ChemicalconditioningICOC+FOCIC+FTreatmenttime,minutes10-2030-4030-40100-120Sludgevolumeas%oftreatedwater0.05–0.10.3–0.43-57-10Oilremovalefficiency,%99–99.585-9560-8050–70SSremovalefficiency,%99–99.590-9585-9090-95Challenge

8、sinOEvolutionAnodes2EconomicalStableActiveOEvolutionAnodes2Pt(wire,mesh,plates)PbO2GraphiteDSA(TiO-RuO;IrOwithTaO,ZrOorCeO)2