Denitrification kinetics in a rotating disk biofilm reactor

• Tipo: Artigo em Revista Científica Internacional
• Data: 1997

Autores

Rui Boaventura (Autor) FEUP; Alírio Rodrigues (Autor) FEUP

Revista

Título: Journal of Engineering and Applied Science

Vol. 65

Páginas: 227-285

ISSN: 1110-1903

Editora: Cairo University

Indexação

Scopus - 9 Citações

Outras Informações

ID Authenticus: P-00F-NPX

Abstract (EN): Denitrification kinetics of a synthetic substrate containing molasses, sodium nitrate. Na2HPO4·12H2O, KH2PO4 and tap water treated with Na2SO3 was studied in a rotating disk biofilm reactor (RDBR). Experiments were performed at various conditions: biofilm thickness in the range 100-1100 ¿m and nitrate concentration in the feed of 5 to 50 mg N l-1. Biofilm density decreases with increasing biofilm thickness. Most experiments were in the kinetic controlled regime or fully penetrated biofilms. The intrinsic zero-order kinetic constant was found to be ko = 7.96 × 10-6 kg NO3-N*kg biofilm-1 s-1 (at 25°C). Some runs were in the diffusion controlled regime or partially penetrated biofilms; the effective diffusivity of nitrate in the biofilm which fitted experimental results was Db = 1.5 × 10-9 m2 s-1. The efficiency of the RDBR, considered as a CSTR, predicted by a model based on a zero-order reaction and diffusion inside the biofilm, reasonably agrees with experimental data.

Idioma: Inglês

Tipo (Avaliação Docente): Científica