| Summary: | Biofilm processes have been profusely used during the last ten years. This, due to the more and more rigorous standards for wastewater treatment and the necessity of a better use of the space. Biofilm processes include the "submerged fixed bed reactors". Such reactors are characterized by their high buffer capacity as a consequence of the organic load fluctuations originated by the high capacity of<br />adsorption of the biofilm. This paper shows the modeling of an aerated fixed bed submerged reactor at pilot plant scale, for the treatment of a synthetic substrate. An experiment design was used. Operational variables used were organic matter concentration as COD, hydraulic retention time, packing area and aeration level.
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