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Extension of ASM3 for two-step nitrification and denitrifiatch.pdf

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Extension of ASM3 for two-step nitrification and denitrifiatch

w a t e r r e s e a r c h 4 3 ( 2 0 0 9 ) 1 6 8 0 – 1 6 9 2Avai lab le at www.sc iencedi rect .com journa l homepage : www.e lsev i er . com/ loca te /wat resExtension of ASM3 for two-step nitrification and denitrification and its calibration and validation with batch tests and pilot scale dataDavid Kaelina, Reto Mansera, Leiv Riegerb, Jack Eugstera, Karin Rottermanna, Hansruedi Siegrista,* aEawag, Swiss Federal Institute of Aquatic Science and Technology, U?berlandstrasse 133, P.O. Box 611, 8600 Du?bendorf, Switzerland bmodelEAU, Universite? Laval, De?partement de ge?nie civil, Pavillon Adrien-Pouliot, 1065 av. de la Me?decine, Quebec QC, G1V 0A6, Canadaa r t i c l e i n f o Article history: Received 19 May 2008 Received in revised form 22 December 2008 Accepted 23 December 2008 Published online 3 January 2009 Keywords: ASM3 Nitrite Nitrification Denitrification Ammonium Nitrite oxidation* Corresponding author. Tel.: t41 44 823 50 5 E-mail addresses: leiv.rieger@gci.ulaval.c 0043-1354/$ – see front matter a 2008 Elsevi doi:10.1016/j.watres.2008.12.039a b s t r a c t Although traditionally not taken into account by most of activated sludge models the production of nitrite as an intermediate of the nitrification–denitrification processes becomes of interest in some specific plant operational situations or in case of high sensi- tivity of the receiving ecosystems. The Activated Sludge Model No.3 (ASM3) was therefore extended for two-step nitrification and two-step denitrification in order to better describe nitrite dynamics especially during the treatment of communal wastewater. Nitrite was included as a new model compound and as an intermediate product of biological processes, both for heterotrophic and autotrophic bacteria. Two new model compounds replace XA, the original autotrophic biomass: Ammonium Oxidizing Bacteria, XAOB and Nitrite Oxidizing Bacteria, XNOB. Growth and decay processes of nitrifiers were split into AOB and NOB processes (3 additional processes)