Selection of the Hydrodynamic Conditions of Galvanocoagulation on Application of Low-Frequency Pulsations to the Medium Being Treated

摘要

A study is undertaken to analyze the enhancement of galvanocoagulation in wastewater treatment to remove nonferrous and ferrous metal ions on application of low-frequency pulsations to the medium being treated. It is noted that, in most cases, galvanocoagulation is controlled by the mass transfer in the anodic dissolution of an element of a galvanic couple and by the ion transfer to the cathode, which are determined by the hydrodynamic conditions at the interface. A procedure is proposed to select the hydrodynamic conditions in the apparatus on application of low-frequency pulsations to the medium which enhance mass transfer. The procedure is tested on the example of treatment of wastewater containing Cr~(+3) and Cr~(+6) ions in a vertical pulsation galvanocoagulator of original design. It is shown that fluidization caused by the application of pulsations increases the rates of mass transfer and overall galvanocoagulation process.