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1、ProcessBiochemistry42(2007)320–328www.elsevier.com/locate/procbioShortcutbiologicalnitrogenremovalinhybridbiofilm/suspendedgrowthreactorsJinwookChunga,b,WookeunBaeb,*,Yong-WooLeec,BruceE.RittmannaaCenterforEnvironmentalBiotechnology,BiodesignInstituteatArizonaStateUniversity,P.O.Bo
2、x875701,Tempe,AZ85287-5701,USAbDepartmentofCivil&EnvironmentalEngineering,HanyangUniversity,Sa1-Dong,Ansan,Kyunggi-Do,RepublicofKoreacSamsungEngineeringCo.,Ltd.,DoosanBldg.,39-3,Sungbok-Dong,Yongin,Gyeonggi-Do449-844,RepublicofKoreaReceived16June2006;receivedinrevisedform30August2
3、006;accepted1September2006AbstractAshortcutbiologicalnitrogenremoval(SBNR)processconvertsammoniumdirectlythroughnitritetonitrogengas,thusrequiringlessaerationandcarbon.WeevaluatedahybridSBNR(HSBNR)reactorcontainingananoxictankfollowedbyanaerobictankandasettlingtank.Theaerobictankw
4、asfilledwithpolyvinylalcoholspongemedia(20%,v/v)toattachandretainammoniumoxidizers.TwoconfigurationsoftheHSBNRreactorweretestedfortreatingawastewaterwithhighstrengthammoniumandorganicelectrondonor.TheHSNBRreactorsaccumulatednitritestablyfor1.5yearsandmaintainedahighfreeammonia(FA)co
5、ncentration(20–25mg/L)andalowdissolvedoxygen(DO)concentration(<1mg/L)intheaerobictank.Apparently,thebiofilmcarriersincreasedthesolidsretentiontime(SRT)forammoniumoxidizers,whilehighFAandlowDOselectedagainstnitriteoxidizersandpromoteddirectdenitrificationofnitriteintheaerobictank.The
6、significantamountofchemicaloxygendemand(COD)wasremovedbyshortcutdenitrificationofnitriteintheanoxictank.#2006ElsevierLtd.Allrightsreserved.Keywords:Dissolvedoxygen;Freeammonia;High-strengthammoniumwastewater;Hybridbiofilmreactor;Nitriteaccumulation;Shortcutbiologicalnitrogenremoval1.
7、IntroductionCH2O(representingtheorganicelectrondonor)inEqs.(1)and(2)(conventionalBNR)toEqs.(3)and(4)(shortcutProcessesforbiologicalnutrientremoval(BNR)typicallyBNR):adoptalternatinganaerobic,anoxic,andaerobiczonesinordertoremovenitrogenandphosphorous,aswellasorganicConventionalBN
8、Rcompounds,fromthewastewater.Inth
