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The regularities of the process of extraction of humic acids (HA) from peat and vermicompost in a rotary pulse apparatus (RPA) have been investigated. It was found that to calculate the mass transfer coefficient, it is necessary to determine the specific power and the values of the Prandtl diffusion criterion; with an increase in the time (number of cycles) of suspension treatment in the RPA, the calculated values of the Prandtl criterion increase and the mass transfer coefficient decreases; the mass transfer coefficient increases with an increase in the specific power consumed for the extraction of HA from peat and vermicompost in the RPA. On the basis of experimental studies, the coefficients in the criterion equation for the process of HA extraction from peat and vermicompost in RPA have been determined.

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