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2018•Revue des sciences de l eauOpen access

Simultaneous nitrate and organic matter removal from a dairy effluent by biodenitrification

Ahmed Hamdani, Mohammed Mountadar, Omar Assobhei

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Abstract

In order to study the simultaneous removal of nitrate and organic matter from a dairy effluent containing 670 mg∙L-1of nitrate (NO3--N) and 5 760 mg∙L-1of 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.

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In order to study the simultaneous removal of nitrate and organic matter from a dairy effluent containing 670 mg∙L-1of nitrate (NO3--N) and 5 760 mg∙L-1of 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.

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Available abstract

In order to study the simultaneous removal of nitrate and organic matter from a dairy effluent containing 670 mg∙L-1of nitrate (NO3--N) and 5 760 mg∙L-1of 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.

Key concepts: Denitrifying bacteria, Nitrate, Effluent, Denitrification, Nitrite, Chemistry, Organic matter, Chemical oxygen demand

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