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Nitrogen removal in a sequencing batch biofilm reactor with liquid circulation: Effect of feed strategy and carbonsource in the denitrifying step

Canto, C. S.A. ; Ratusznei, S. M. ; Rodrigues, J. A.D. ; Zaiat, M. ; Foresti, E.

Afinidad, 2010, Vol.67 (545) [Periódico revisado por pares]

Universitat Ramon Llull

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  • Título:
    Nitrogen removal in a sequencing batch biofilm reactor with liquid circulation: Effect of feed strategy and carbonsource in the denitrifying step
  • Autor: Canto, C. S.A. ; Ratusznei, S. M. ; Rodrigues, J. A.D. ; Zaiat, M. ; Foresti, E.
  • É parte de: Afinidad, 2010, Vol.67 (545)
  • Descrição: Ammonium nitrogen removal from a synthetic wastewater by nitrification and denitrification processes were performed in a sequencing batch biofilm reactor containing immobilized biomass on polyurethane foam with circulation of the liquid-phase. It was analyzed the effect of four external carbon sources (ethanol, acetate, carbon synthetic medium and methanol) acting as electron donors in the denitrifying process. The experiments were conducted with intermittent aeration and operated at 30±1°C in 8-hcycles. The synthetic wastewater (100 mgCOD/L and50 mgNH4+ -N/L) was added batch-wise, while the external carbon sources were added fed-batch-wise during the periods where aeration was suspended. Ammonium nitrogen removal efficiencies obtained were 95.7, 94.3 and 97.5% for ethanol, acetate and carbon synthetic medium, respectively. As to nitrite, nitrate and ammonium nitrogen effluent concentrations, the results obtained were, respectively: 0.1, 5.7 and 1.4 mg/L for ethanol; 0.2, 4.1 and 1.8 mg/L for acetate and 0.2, 6.7 and 0.8 for carbon synthetic medium. On the other hand using methanol, even at low concentrations (50% of the stoichiometric value calculated for completedenitrification), resulted in increasing accumulation of nitrate and ammonium nitrogen in the effluent over time.
  • Editor: Universitat Ramon Llull
  • Idioma: Catalão
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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