Résumés
Abstract
In order to study the simultaneous removal of nitrate and organic matter from a dairy effluent containing 670 mg∙L-1 of nitrate (NO3--N) and 5 760 mg∙L-1 of dissolved chemical oxygen demand (CODd), denitrification in a laboratory scale bioreactor consisting of an immersed bacterial bed colonized by an heterotrophic denitrifying flora (HDF) selected for NO3- reduction, COD consumption and adapted to grow on an effluent produced by a dairy industry was investigated. The obtained results indicated that at the optimal conditions of temperature (30°C), pH (7), COD/NO3--N ratio (5), the operation lasted 108h with total reduction of nitrate in 72h, no nitrite accumulation, and 92% of soluble COD removal in 96h. This indicates that the biodenitrification was accompanied with a high efficiency of matter organic removal as an electron donor, and thereby satisfies the applicable standards.
Keywords:
- dairy effluent,
- nitrates,
- chemical oxygen demand,
- biodenitrification,
- heterotrophic denitrifying flora,
- immersed bacterial bed
Résumé
Dans le but d’étudier la biodénitrification d'un effluent industriel laitier à fortes concentrations en nitrates (670 mg∙L-1 de N-NO3-) et en matière organique biodégradable (5 760 mg∙L-1 de DCO soluble), un procédé de type lit bactérien immergé (fonctionnant en mode continu et colonisé par une flore hétérotrophe dénitrifiante) a été mis en oeuvre au laboratoire BIOMARE de la Faculté des Sciences de l’Université Chouaib Doukkali d’El Jadida (Maroc). Lorsque le procédé fonctionne dans des conditions optimales (pH 7, température = 30 °C, rapport massique DCO/N-NO3- = 5), des taux d’abattement des nitrates de l’ordre de 100 % sans accumulation de nitrites, couplés à l’enlèvement de 92 % de la DCO soluble ont été obtenus au bout de 72 h et 96 h respectivement, ce qui permet de respecter les normes en vigueur pour ces deux paramètres.
Mots-clés :
- effluent laitier,
- nitrates,
- demande chimique en oxygène,
- biodénitrification,
- flore hétérotrophe dénitrifiante,
- lit bactérien immergé
Parties annexes
References
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