Treatment of cork boiling wastewater using chemical oxidation and biodegradation

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1、Chemosphere64(2006)455–461www.elsevier.com/locate/chemosphereTreatmentofcorkboilingwastewaterusingchemicaloxidationandbiodegradationa,cabManuelaDias-Machado,LuisM.Madeira,BalbinaNogales,ac,*OlgaC.Nunes,Ce´liaM.ManaiaaLEPAE—DepartamentodeEngenhariaQuı´mica,FaculdadedeEngenh

2、aria,UniversidadedoPorto,4200-465Porto,PortugalbAreadeMicrobiologia,UniversitatdelesIllesBalears,PalmadeMallorca,SpaincEscolaSuperiordeBiotecnologia,UniversidadeCato´licaPortuguesa,4200-072Porto,PortugalReceived11July2005;receivedinrevisedform31October2005;accepted1Novembe

3、r2005Availableonline18January2006AbstractThreecultureswereenrichedfromcorkboilingwastewaterusingtannicacidastheselectivecarbonsubstrate,at25°CandpH7.2,25°CandpH4.7and50°CandpH4.7.TheenrichmentcultureobtainedatneutralpHwascomposedoffiveculturableisolates,whereasfromeachacidi

4、cenrichmenttwobacterialstrainswereisolated.MesophilicisolateswereGramnegativebacteriabelongingtothegeneraKlebsiella,Pseudomonas,StenotrophomonasandBurkholderia.ThermophilicisolatesweremembersofthegenusBacillus.Despitethecapabilityoftheenrichmentculturestousetannicacidassin

5、glecarbonandenergysource,thosecultureswereunabletoreducethetotalpolyphenolsorthetotalorganiccarboncontentofcorkboilingwastewater.Inordertoincreasethebioavailabilityoftheorganiccarbonincorkboilingwastewater,biodegradationwasprecededbyFentonoxidation.Itwasdemonstratedthatthe

6、combinedprocess,usingsmallamountsofFentonreagentsandbiodegradativeinoculumaddedalmostsimultaneouslytocorkboilingwastewater,leadstoTOCreductionsofmorethan90%.Ó2005ElsevierLtd.Allrightsreserved.Keywords:Polyphenols;Mesophiles;Thermophiles;Tannicacidbiodegradation;Fentonoxida

7、tion1.Introductionoxygendemand(BOD)andpolyphenolscontent,inthe111rangeof4.5–5.5gl,1.1–1.8gland0.6–0.9gl,res-Corkproductionandprocessingareimportantsectorspectively,andbyanacidicpHaround5(AEP,2000).ofactivityinPortugal.AftertheharvestfromtheproducerDespitethefactthatsuch

8、parametersexceedthoselegallytree,QuercussuberL.,thecorkisstabilisedbydryinginadmittedinre