THE KINETICS OF THE COMBINED PROCESSES OF DISPERSION AND EXTRACTION OF HUMIC AND FULVIC ACIDS FROM PEAT AND VERMICOMPOST IN THE ROTOR-STATOR DEVICE
Abstract
Was conducted an experimental study of dispersion of solid particles, extraction of humic acids (HA) and fullview acids (FA) in suspensions of peat and vermicompost with repeated mechanical and hydrodynamic treatment in a rotor-stator device (RSD). According to reduce the average particle size and increase the concentration of HA and FA in suspensions of peat and vermicompost on the number of cycles in the RSD have an exponential character. The average particle size in suspensions of peat and vermicompost decreases from average size of 1 mm to 30 µm at 40 times the treatment of the suspension in the RSD. The intensity of the mass transfer of target substances from the solid phase to the liquid phase is due to an increase in the contact area of the phases, the value of which depends not only on the surface area of the solid particles, but significantly increases due to the opening of new pores and capillaries during particle grinding. The concentration of water-soluble HA in 25% peat suspension reaches 20 g/l, the concentration of FA – 6 g/l. The concentration of water-soluble HA in 25% vermicompost suspension reaches 12 g/l. Extractable substances on the surface of the particle and in the pores close to the surface, pass into the solution mainly during the first 10 treatment cycles. Effective diffusion coefficients and empirical coefficients of the kinetic equation for the extraction process of HA and FA in peat and vermicompost suspensions during their processing in RSD were determined.
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