Influence of dissolved oxygen on nitrification kinetics in a circulating bed reactor

• Autor(a) principal: Lazarova, V.
• Data de Publicação: 1998
• Outros Autores: Nogueira, R., Manem, J., Melo, L. F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/1583
• topic: Nitrification; Biofilm; Kinetics; Oxygen; Circulating bed reactor; Biological oxygen monitor; Science & Technology

The influence of dissolved oxygen concentration in nitrification kinetics was studied in a new biofilm reactor, the circulating bed reactor (CBR). The study was carried out partly at laboratory scale with synthetic water containing inorganic carbon and nitrogen compounds, and partly at pilot scale for secondary and tertiary nitrification of municipal wastewater. The experimental results showed that either the ammonia or the oxygen concentration could be limiting for the nitrification rate. The transition from the ammonia to oxygen limiting conditions occurred for an oxygen to ammonia concentration ratio of about 1.5-2 gO2/gN-NH4+ for both laboratory- and pilot-scale reactors. The nitrification kinetics of the laboratory-scale reactor was close to a half-order function of the oxygen concentration, when oxygen was the rate limiting substrate.