Effects of temperature on tertiary nitrification

Effects of temperature on tertiary nitrificationAvailableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/watresEffectsoftemperatureontertiarynitrificationinmoving-bedbiofilmreactorsRobertaSalvetti�,AriannaAzzellino,RobertoCanziani,LucaBonomoD.I.I.A.R.EnvironmentalEngineeringDepartment,PolitecnicodiMilano,TechnicalUniversityofMilan,P.zaLeonardodaVinci,32-20133Milano,ItalyarticleinfoArticlehistory:Received31August2005Receivedinrevisedform4May2006Accepted9May2006Availableonline13July2006Keywords:NitrificationTemperaturePure-oxygenmoving-bedbiofilmreactor(PO-MBBR)AmmonialimitationOxygenlimitationMultivariatetechniquesABSTRACTTheeffectofwastewatertemperatureontherateofnitrificationwasstudiedintwopure-oxygenmoving-bedbiofilmreactors,fedonsecondaryeffluentfromamunicipalwaste-watertreatmentplant.ThefirstReactor(R1)wasoperatedunderammonia-limitingconditions,whilethesecondReactor(R2)wasoperatedunderoxygen-limitingconditions.Quitesurprisingly,theformershowedanegligibleinfluenceofth