A Mathematical Model of Biological Purification in Aerated Activated Carbon Biofilters

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Abstract
On the basis of results obtained in the laboratory and in a semi-industrial pilot, this paper outlines the probable mechanism of biological purification on activated carbon. It shows that with small loads, the medium's porosity plays a permanent role in the treatment of a water. The biological activity which develops on the material acts in a complementary fashion, allowing for continuous regeneration of the activated carbon's pores. With heavy loads, there are two phases. During the first, adsorption and biological regeneration are complementary. This phase lasts three to four hours. During the second phase, development of the biomass obstructs the occurrence of the adsorption phenomenon. Substrate is removed on the surface. This second phase lasts from fifteen to twenty hours, until the filter is clogged. After washing, the first phase again enters into operation. A mathematical model is presented. It describes results obtained with small and heavy loads.

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