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

Autor(es)

Canto, C. S. A. ^[1] ; Ratusznei, S. M. ^[1] ; Rodrigues, J. A. D. ^[1] ; Zaiat, M. ^[2] ; Foresti, E. ^[2]

Afiliação do(s) autor(es)

^[1] EEM, IMT, BR-09580900 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Hidraul & Saneamento, BR-13566590 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Afinidad; v. 67, n. 545, p. 51-60, JAN-FEB 2010.
• Citações Web of Science: 1

Resumo

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 degrees C in 8-h cycles. The synthetic wastewater (100 mgCOD/L and 50 mgNH(4)(+)-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 complete denitrification), resulted in increasing accumulation of nitrate and ammonium nitrogen in the effluent over time. (AU)

• Processo FAPESP: 01/05489-0 - Desenvolvimento, análise, aprimoramento e otimização de reatores anaeróbios para tratamento de águas residuárias
• Beneficiário: Eugenio Foresti
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 02/07504-0 - Remoção de nitrogênio de efluente de reator anaeróbio pelo processo de nitrificação e desnitrificação em etapa única por reator com recirculação da fase líquida e microaerado, com biomassa imobilizada
• Beneficiário: Catarina Simone Andrade do Canto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado