Performance of Modified Electro-Fenton Process for Phenol Degradation Using Bipolar Graphite Electrodes and Activated Carbon
Publication: Journal of Environmental Engineering
Volume 138, Issue 6
Abstract
A modified version of the electro-Fenton process was evaluated for the degradation of phenol in an aqueous solution with bipolar graphite electrodes and activated carbon. The effects on reaction parameters including the pH value of the solution, the dosage of ferrous ion, and the current density within the solution on the removal of phenol and at various reaction times were evaluated for the treatment of wastewater containing phenol of and granular activated carbon (GAC) of at . Removal mechanisms were also investigated by analyzing intermediate products by using high performance liquid chromatography (HPLC) and Gas chromatography-mass spectrometry (GC-MS). Results showed that removal efficiencies of phenol and were 93 and 65%, respectively at a pH of 3.0, a current density of , a dosage of ferrous ion of , and a reaction duration of 60 min. When the reaction time was increased to 180 min, the phenol concentration in the wastewater was below the detection limit. Phenol removal efficiency decreased significantly when , a hydroxide radical scavenger, was added in the reactor. This indicates that both electro catalytic oxidation and radical oxidation contributed to the degradation of phenol. The removal efficiency of phenol achieved 39, 65, and 93% at a reaction time of 60 min when the traditional electrolysis, the traditional electro-Fenton process, and the modified electro-Fenton process were used, respectively.
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Acknowledgments
Support from the National Natural Science Foundation of China (Grant No. 50778066), the National Science and Technology Support Program from the Ministry of Science and Technology of China (Contract No. 2006BAJ04A13), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20090161110010) is highly appreciated.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 138 • Issue 6 • June 2012
Pages: 613 - 619
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Nov 28, 2010
Accepted: Oct 31, 2011
Published online: Nov 3, 2011
Published in print: Jun 1, 2012
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