Electrochemical Processes for the Treatment of Hazardous Wastes Exemplified by Electroplating Sludge Leaching Solutions

The solidified landfill disposal of hazardous solid waste such as electroplating sludge in arid/semi-arid areas has potential risks and hazards. In this study, the electrochemical method was used to destroy structures metal complexes release ions so that organics were removed by direct mineralization anode while recovered cathode. A SnO2/Ti electrode during electrolysis process. effect different current densities (10, 20, 30, 40, 50, 60 A/m2), pH values (2, 3, 4, 5, 6), presence chloride (0.1 or 0.2 M NaCl) sulfate Na2SO4) on treatment investigated. Under optimal conditions (current density = 50 A/m2, 3), removal rates CODCr, TOC, Ni2+ reached 88.01%, 85.38%, 97.57%, respectively, with a recovery 97.01%. Further studies showed active chlorine persulfate generated had less organics, hydroxyl radicals played major role. dilution leachate would be detrimental treatment. by-products organic chlorination produced low amounts, mainly CHCl3. This can treat various recover valuable metals removing pollutants, complying concept sustainable development. provides new solution for metal-containing from perspective practical application.