Synthesis of Ferrate(VI) in Two Cathodes and One Anode Cell: Enhanced Efficiency and Treatment of Thiocyanate in Wastewater
Publication: Journal of Environmental Engineering
Volume 144, Issue 10
Abstract
Ferrate(VI) () is a greener oxidant in the treatment of wastewater. This paper presents electrochemical synthesis using two titanium ruthenium sheets as cathodes and a gray cast iron sheet as anode (two cathodes/one anode cell configuration). This electrolytic cell was demonstrated to produce more Fe(VI) than a one cathode/one anode cell configuration ( versus ). In the cell, hydroxide ion concentration (), current density (), distance between cathodes and anode (), and electrolyte NaCl concentration were varied to obtain optimum conditions to generate Fe(VI) efficiently. The optimum NaOH concentration was determined to be in using applied , , , , and . The efficiency of Fe(VI) to remove in petroleum wastewater was tested in the pH range from 7.0 to 12.0. Additions of coagulants, polyaluminum chloride (PAC), and polyacrylamide (PAM) to petroleum wastewater under alkaline conditions eliminated the large particles present in the wastewater. Fe(VI) treatment of particle-free wastewater showed almost complete removal of at pH 7.0–9.0 using . At of the reaction mixture of Fe(VI) and wastewater, incomplete removal of in wastewater was observed.
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Acknowledgments
The authors greatly appreciated the financial support from the Key Projects of Enterprise and University Cooperation in Fujian (Grant No. 2018Y4010), the Program for the Natural Science Foundation of China (Grant No. 51678255), and the National Science and Technology Support Program of China (Grant No. 2015BAL01B01).
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 10 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 12, 2017
Accepted: Mar 30, 2018
Published online: Aug 2, 2018
Published in print: Oct 1, 2018
Discussion open until: Jan 2, 2019
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