Electrochemical Treatment for Wastewater Contained Heavy Metal the Removing of the COD and Heavy Metal Ions

Abstract In this work, the goal for an optimum condition of the electrochemical oxidation technique which is used to treat the wastewater from the metal finishing process, was experimentally investigated and obtained. All the experiments were carried out with the effects of operational parameters such as pH value, current density, electrolysis time, chemical oxidation demand (COD), removal efficiency are determined. Because of the property of the wastewater itself which conclude a lot of metal ions, means we don’t have to use any of electrolyte solution, Carbon Cloth (5×5 cm) and Platinum wire were proved to be the best cathode and anode materials here respectively. The applied current density are from a solar penal (17 mA), when we don’t actually control the pH value, the percentage of COD removal reached 52%, and the removal efficiency of metal ions was 22.5%. Our work focused on decreasing the quantity of heavy metal ions of the wastewater, as long as achieving a high COD removal efficiency by controlling the four key factors which were electrodes, working temperature, pH value and a fixed value of applied current.

Keywords Metal Finishing Process, Chemical Oxidation Demand, Different Pulse Voltammetry, Electrochemical Processes.

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