The Effect of Operating Conditions on Simultaneous Removal of Phosphate, Nitrate and COD from Laundry Wastewater by Electrocoagulation Using Aluminum Electrodes

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Abstract

Nowadays use of detergents and cleaners becomes one of the essential of human life's. Since these materials enter to the sewage systems, due to the existing poly phosphate, reacts with water and gradually becomes into phosphate ions and cause too many environmental problems that always have considered environmentalists. This study examined three factors was investigated in the removal of phosphate, nitrate and COD by electro coagulation process and aluminum electrodes. Electro coagulation process is a electrolysis reaction, needed the electrical adequate potential between two or several electrodes for the electrodes interface and solution with a DC power supply. In this process removal operation of pollutants (flocks metal hydroxide), with the applying the electrical current to the buoyant electrodes products in the purification sample. The results of the present study showed that pH, distance between the electrodes and current density are the three effective parameters in the removal of factors. Also The optimum operating conditions, in pH=7, distance between the electrodes was 10mm and current density was 12 mA/cm2. Also phosphate, nitrate and COD removal efficiency in optimum conditions were 99.93%, 67.85% and 70.83%, respectively. The XRF and XRD experience in this study, the corrosion of the electrode and the presence that in the sludge as metal oxide was A2O3.

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Journal of Environmental Studies
Volume 38, Issue 3 - Serial Number 3
December 2012
Pages 75-84

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