Removal of chromium hexavalent from rinsing chromating waters electrochemical reduction in a laboratory pilot plant

摘要: In this work, experiments in a 16 L operating volume laboratory pilot plant with ring iron rotary electrodes were performed, obtaining an overall kinetic equation rate of hexavalent chromium reduction concentration and current density-dependent. Other scale-up criteria such as Reynolds9 number also evaluated to ensure completely stirred reactor at low energy expenditure. A dimensionless N E is relationship between liquid properties the electric charge supplied system. The number, which depends on rotation electrode speed density, proposed be used criterion. It was found that Re = 42,179 (130 rpm rate) NE 9.8 × 105 (current density 113 A/m 2 ), complete mixing reached minimum spent process becomes more efficient. addition, it higher less treatment time agitation. After electrochemical CrVI rinsing wastewater than 0.5 mg/L.