| Full text | |
| Author(s): |
Albanez, Roberta
[1]
;
do Canto, Catarina S. A.
[1]
;
Ratusznei, Suzana M.
[1]
;
Rodrigues, Jose A. D.
[1]
;
Zaiat, Marcelo
[2]
;
Foresti, Eugenio
[2]
Total Authors: 6
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Afinidad; v. 66, n. 539, p. 44-55, JAN-FEB 2009. |
| Web of Science Citations: | 4 |
| Abstract | |
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) | |
| FAPESP's process: | 05/51702-9 - Development of combined systems of treatment of residuary waters aimed at removal of pollutants and recovery of energy and of products from the carbon, nitrogen and sulphur cycles |
| Grantee: | Eugenio Foresti |
| Support Opportunities: | Research Projects - Thematic Grants |