Electrocoagulation technique was employed for removal of organic matters in abattoir wastewater. The experiments
were carried out using batch apparatus with monopolar iron (Fe) plate anode and cathode employed as electrodes.
The effect of various process variables such as current density (12.35 – 61.73 mA/cm2), operating time of 15 to 60
minutes, initial pH of the wastewater (3.0 – 10.0) and inter-electrode spacing of 1.0 to 3.0 cm was investigated by
keeping the background electrolyte constant at 1500 mg/L of Na2SO4. The efficiency of the process was evaluated
using current efficiency and power consumption while the kinetic of the process was evaluated. It was found that the
optimum condition for the process was: 61.73 mA/cm2 current density, inter-electrode spacing of 1.0 cm, and pH of
7. The power consumption with reference to COD removal increased from 3.88 to 7.11 % and 3.81 to 9.77 kWh/kg
within current density of 12.35 to 61.73 mA/cm2. The Electrocoagulation process is deduced to be pseudo second
order process with rate constant of 0.744 L.min/mg.
Keywords: electro-coagulation, abattoir, wastewater, COD, NTU
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