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Abstract
Electrocoagulation (EC) is an electrochemical method of treating pollutant water whereby sacrificial anode corrode to release active coagulant (usually aluminum or iron cations) into solution. Accompanying electrolytic reaction evolves gas (usually as hydrogen bubbles) at the cathode. EC has a long history as a water treatment technology having been employed to remove a wide range of pollutants.
A great deal of work performed in the last decades has proved that EC is an effective technology for the treatment of heavy metal containing solutions which is easy and clean method.
The present work deals with the removal of lead by EC using a new cell configuration with cylindrical electrode. The effect of different variables on the %removal of lead was studied such as: (I) effect of initial concentration of lead, (2) effect of current density, (3) effect of pH (using Al and Fe electrodes), (4) effect of electrolytes (using NaC1 and NaNO3) and (5) effect of the cell geometry (flat plate electrode and cylindrical electrode).
The present work has shown that the performance of a cylindrical electrode cell is superior to the flat plate electrode cell in removal of lead by EC. The experimental results showed that the %rernoval of lead increases with increasing current density, NaC1 concentration, pH and decreases with increasing initial concentration of Pb and NaNO3 concentration. The energy consumption was also calculated and was found to range from 5.63 to 35.89 kWh/kg Pb removed in cylindrical electrode cell and from 11.95 to 68.87 kWh/kg Pb removed in flat plate electrode cell depending on the operating conditions.
By studying the kinetics of the process reaction, it was found to be a first order reaction