| Full text | |
| Author(s): |
Canto, C. S. A.
[1]
;
Ratusznei, S. M.
[1]
;
Rodrigues, J. A. D.
[1]
;
Zaiat, M.
[2]
;
Foresti, E.
[2]
Total Authors: 5
|
| Affiliation: | [1] EEM, IMT, BR-09580900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Hidraul & Saneamento, BR-13566590 Sao Paulo - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Afinidad; v. 67, n. 545, p. 51-60, JAN-FEB 2010. |
| Web of Science Citations: | 1 |
| Abstract | |
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) | |
| FAPESP's process: | 01/05489-0 - Development, analysis, improvement, and optimization of anaerobic reactors for wastewater treatment |
| Grantee: | Eugenio Foresti |
| Support Opportunities: | Research Projects - Thematic Grants |