A layered biofilm model which expresses the growth process of biofilm with attrition in a methanogenic fluidized bed reactor is developed based on results of experiment to comprehend distributions of biomass in the biofilm. Availability of the model and the existence of “dormant” biomass in the biofilm are discussed in comparison with the experimental results. Distributions of the active, dormant, and inert biomasses and extracellular polymer in a biofilm are predicted by the model. Comparing specific activities of sloughed and remaining biomasses with those of the attached biomass, the existence of “dormant” biomass in the biofilm is indicated. The model also expresses distributions of specific activities of active and dormant biomasses in the biofilm with high accuracy. The model is applicable to predict the distributions of biomasses in a biofilm under various sloughing conditions.

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