Mass Transfer in a Layer of Aluminized Glass-Fiber Material in the Treatment of Chrome-Containing Wastewater

Abstract

Abstract It is possible to use column-type devices with the loading of composite material - thin glass fibres partially coated with an aluminium layer (AGFM) to purify low-concentrated wastewater on plating plant containing chromium compounds. The main physical characteristics of this material are given. For the mass transfer research, current-potential curves obtained by reducing the chromium forms Cr(VI) to trivalent on a thin copper yarn placed in a layer of aluminum-removed fiberglass were studied. Dependence of effective mass-transfer coefficient on solution flow rate is obtained. Taking into account the ionic strength of the solution, the diffusion coefficient of the reducing anion Cr(VI) was calculated, which allowed to move to the criterion equations of the form Nu = f (Pr, Re). Coefficients are found in the criteria mass-transfer equation at different degrees of filling of the filter volume with a AGFM material.