Combined anaerobic and activated sludge anoxic/oxic treatment for piggery wastewater | Couplage de la digestion anaérobie et du traitement par boues activées pour le traitement des effluents de porcherie
2011
Rajagopal, R. | Rousseau, Philippe | Bernet, N. | Béline, Fabrice | Gestion environnementale et traitement biologique des déchets (UR GERE) ; Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) | Université européenne de Bretagne - European University of Brittany (UEB) | Institut National de la Recherche Agronomique (INRA) | French National Research Agency (ANR)
[Departement_IRSTEA]Ecotechnologies [TR1_IRSTEA]TED [Axe_IRSTEA]TED-EPURE
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Afficher plus [+] Moins [-]anglais. A process combining anaerobic digestion and anoxic/oxic treatment was developed to treat pig slurry in-order-to partially convert organic matter (OM) into a valuable energy and simultaneously to comply with the environmental constraints as regards to nitrogen removal. However, OM content of digested pig slurry is insufficient to allow a further complete denitrification of the mineral nitrogen content. Hence, four different configurations were designed and evaluated to manage the OM requirements and achieve denitrification. Partial nitrification (PN) of ammonium to nitrite was also applied by regulating oxygen inflow time. Thus, the combined process could remove 38-52% of CODt, 79-88% of CODs, 66-75% of TN and 98-99% of NH4+N concentrations depending on the slurry characteristics. Anaerobic digestion was able to produce 5.9 Nm3 of CH4/m3 of slurry added. PN allowed a reduction in the oxygen and OM requirements respectively for nitrification and denitrification. Thus, this process trims-down the energy costs at the farm scale.
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