Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/1475
Título: Impact of aeration conditions on the removal of low concentrations of nitrogen in a tertiary partially aerated biological filter
Autor: Albuquerque, António
Makinia, Jacek
Pagilla, Krishna
Palavras-chave: Biological aerated filter
Denitrification
Nitrogen removal
Nitrification
Partial aeration
BAF
Residual removal
Nutrient removal
Data: 2012
Editora: Elsevier
Resumo: A submerged biological aerated filter (BAF) partially aerated was used to study the removal of low concentrations of ammonia nitrogen (0.3 g N/m3 to 30.5 g N/m3) typically found in nutrient enriched river and lake waters, and treated effluents. Four series of experiments were performed with a synthetic wastewater at ammonia loading rates between 6 g N/m3 d and 903 g N/m3 d and C/N ratios from 2 to 20. The results showed that ammonia removal rates reached higher values (172 g N/m3 d to 564 g N/m3 d) for C/N = 2 and lower values (13.6 g N/m3 d to 34.6 g N/m3 d) for C/N = 20. Between 50% and 70% of the ammonia was removed in the upper section of the BAF, where the dissolved oxygen (DO) concentration was over 2.1 g O2/m3 and the biofilm depth ranged from 0.4 to 0.6 mm. At the bottom section of the reactor, simultaneous removal of ammonia and nitrate was observed at the DO concentrations in the range 0.4 g O2/m3 to 0.8 g O2/m3. There was no removal of ammonia nitrogen for loads below 15 g N/m3.d. The results indicate that the removal of nitrogen in partially aerated BAF may not only be explained by the conventional mechanisms of nitrification/denitrification.
Peer review: yes
URI: http://hdl.handle.net/10400.6/1475
ISSN: 0925-8574
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