Resumo

SANCHEZ ORTIZ, Iván Andrés et al. NITRIFICAÇÃO DE DIFERENTES SUBSTRATOS EM REATORES AERÓBIOS DE LEITO FLUIDIZADO DE CIRCULAÇÃO INTERNA. Rev. ing. univ. Medellín [online]. 2012, vol.11, n.21, pp.53-62. ISSN 1692-3324.

This research was intended to study the efficiency of removing total nitrogen (TN) and total ammoniacal nitrogen (TAN) in waste water of intensive and domestic fish farming, through three-phase fluidized bed aerobic reactors with circulation in concentric tubes. Several internal diameters (100; 125; and 150 mm) were used for the same external diameter of 250 mm; filter sand and granular activated carbon were used as a support medium; reactors were tested with hydraulic retention times of 11.5 minutes for R100 reactor and three hours for R125 and R150 reactors. Mean removal efficiencies of TN and TAN were as follows: 24% for R100 Reactor; 38% and 40% for R125 Reactor; and 30% and 49% for R150 Reactor, respectively. The bigger the internal diameter the better the efficiency of TAN removal.

Palavras-chave : Waste water; fluidized bed; biological treatment; nitrogen.

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