| Texto completo | |
| Autor(es): |
Albanez, Roberta
[1]
;
do Canto, Catarina S. A.
[1]
;
Ratusznei, Suzana M.
[1]
;
Rodrigues, Jose A. D.
[1]
;
Zaiat, Marcelo
[2]
;
Foresti, Eugenio
[2]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] IMT, EEM, BR-09580900 Sao Caetano do Sul, SP - Brazil
[2] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Hidrdul & Saneamento, BR-13566590 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Afinidad; v. 66, n. 539, p. 44-55, JAN-FEB 2009. |
| Citações Web of Science: | 4 |
| Resumo | |
The objective of this work was to study the operational feasibility of nitrification and denitrification processes in a mechanically stirred sequencing batch reactor (SBR) operated in batch and fed-batch mode. The reactor was equipped with a draft-tube to improve mass transfer and contained dispersed (aerobic) and granulated (anaerobic) biomass. The following reactor variables were adjusted: aeration time during the nitrification step; dissolved oxygen concentration, feed time defining batch and fed-batch phases, concentration of external carbon source used as electron donor during the denitrification stage and volumetric ammonium nitrogen load in the influent. The reactor (5 L volume) was maintained at 30 +/- 1 degrees C and treated either 1.0 or 1.5 L wastewater in 8-h cycles. Ammonium nitrogen concentrations assessed were: 50 (condition 1) and 100 mgN-NH(4)(+).L(-1) (condition 2), resulting in 29 and 67 mgN-NH(4)(+).L-1-d(-1), respectively. A synthetic medium and ethanol were used as external carbon sources (ECS). Total nitrogen removal efficiencies were 94.4 and 95.9% when the reactor was operated under conditions 1 and 2, respectively. Low nitrite (0.2 and 0.3 mgN-NO(2)(-).L(-1), respectively) and nitrate (0.01 and 0.3 mgN-NO(3)(-).L(-1), respectively) concentrations were detected in the effluent and ammonium nitrogen removal efficiencies were 97.6% and 99.6% under conditions 1 and 2, respectively. (AU) | |
| Processo FAPESP: | 06/51418-1 - Remoção biológica de compostos sulfurosos em biorreator operado em batelada sequencial, com recirculação da fase líquida e biomassa imobilizada |
| Beneficiário: | Catarina Simone Andrade do Canto |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 05/51702-9 - Desenvolvimento de sistemas combinados de tratamento de águas residuárias visando à remoção de poluentes e à recuperação de energia e de produtos dos ciclos de carbono, nitrogênio e enxofre |
| Beneficiário: | Eugenio Foresti |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 05/57340-1 - Nitrificação e desnitrificação simultâneas aplicadas ao tratamento de esgoto sintético em SBR com draft-tube e agitação mecânica contendo biomassa granulada |
| Beneficiário: | Roberta Albanez Toreta |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |