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Water Science & Technology In Press, Uncorrected Proof © IWA Publishing 2013  |  doi:10.2166/wst.2013.439

Electrocoagulation for the removal of phenol and aldehyde contaminants from resin effluent

Mohammad Ebrahim Olya and Azam Pirkarami

Department of Environmental Research, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran E-mail: me.olya2@gmail.com; olya-me@icrc.ac.ir

First received 31 January 2013; accepted in revised form 26 June 2013. Available online 19 October 2013


ABSTRACT

This paper is a report on a study which aimed to investigate the effect of different current density, pH, temperature, and cathode–anode combination on the removal of phenol and aldehyde in two samples of actual resin effluent through the process of electrocoagulation using solar energy. Current density 60 A/m2 and pH 6 proved to be the best levels for both contaminants. As for the effect of temperature, although the highest degree of phenol and aldehyde removal was achieved at 15 °C, 25 °C was taken to be the optimum temperature for economic reasons. The Fe-Fe combination of electrodes was found to be the best as it led to nearly 93% of phenol removal and approximately 95% of aldehyde removal. Also, the effect of electrode combination on energy consumption was studied. It was observed that the Fe-Fe combination consumed the least amount of energy (0.7–4.3 kWh/m3 of wastewater in the case of phenol and 0.8–4 kWh/m3 of wastewater in the case aldehyde). Moreover, the Fe-Fe combination brought about the best results in terms of chemical oxygen demand removal: 93% in both cases. Finally, an economic analysis was performed for the electrocoagulation process.

Keywords: aldehyde removal; economic analysis; phenol removal; resin effluent; solar energy


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