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The dependence of toluene elimination capacity on its load was determined in five small-scale reactors filled with glass beads carrying biocatalyst cells. With an increase in the operation time, the calculated maximum elimination capacity was shown to increase in parallel with the biomass density in the biocatalyst bed. A fivefold increase in the trickling rate did not affect the reactor performance. A simplified mathematical model for evaluating the minimal required biocatalyst bed volume at a certain loading was developed based on the experimental curve of elimination capacity versus loading.