Water Science & Technology—WST Vol 58 No 1 pp 133–141 © IWA Publishing 2008 doi:10.2166/wst.2008.322
Combined anaerobic digestion and biological nitrogen removal for piggery wastewater treatment: a modelling approach
P. Rousseau, F. Béline, J.-P. Steyer, E. I. P Volcke and N. Bernet
Cemagref, Environmental management and biological treatment of wastes Research unit, 17 Avenue de Cucillé, CS 64427, F-35044, Rennes Cedex, France E-mail: pierre.rousseau@cemagref.fr; fabrice.beline@cemagref.fr
Laboratoire de Biotechnologie de l'Environnement, INRA, UR050, Avenue des Etangs, F-11100, Narbonne, France E-mail: steyer@supagro.inra.fr; volcke@supagro.inra.fr; bernet@supagro.inra.fr
ABSTRACT
In order to deal with the environmental problems associated with animal production industrialization and at the same time considering energy costs increasing, a piggery wastewater treatment process consisting of combined anaerobic digestion and biological nitrogen removal by activated sludge was developed. This contribution presents a modelling framework in order to optimize this process. Modified versions of the well established ASM1 and ADM1 models have been used. The ADM1 was extended with biological denitrification. pH calculation and liquid gas-transfer were modified to take into account the effect of associated components. Finally, two interfaces (ADMtoASM and ASMtoADM) were built in order to combine both models. These interfaces set up the COD, nitrogen, alkalinity and charge fractionation between both models. However, for the mass balances between both models, some hypotheses were considered and might be evaluated.
Keywords: ADM1; anaerobic digestion; ASM1; denitrification; nitrification; piggery wastewater
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