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The Effect of Generated Chlorine Gas on electroremediation of Heavy Metals from Offshore Muds

Journal of Environmental Protection 2012年第5期3卷 363-373页

作者： Sanghee Shin George V. Chilingar Muhammad Haroun Bisweswar Ghosh Najmedin Meshkati Sibel Pamukcu J. Kenneth Wittle Manal Al Badawi Electropetroleum Inc. Wayne USA Lehigh University Bethlehem USA Petroleum Institute Abu Dhabi United Arab Emirates Sonny Astani Civil and Environmental Engineering University of Southern California Los Angeles USA

The removal efficiency of heavy metals from offshore muds is enhanced in the presence of generated chlorine gas (Cl2). The tests showed a high removal efficiency of heavy metals at the anode end of cores after 24 hours of EK application. In the initial tests, high electrokinetic flow potential was achieved;however, high levels of chlorine gas were produced in the high-salinity environments. The process was improved by controlling and maintaining a certain fraction of the chlorine gas (Cl2) in place. The pH was controlled by the chlorine gas maintained in-situ and transported from the anode to cathode. The transports of four heavy metals were evaluated in this study. The chlorine gas can have two impacts on the transport of metals in the system. One is to oxidize the metal ions to a higher oxidation state and the second is to form chloride complexes, which have higher mobility in the system. Determination of oxidation state and the subsequent metal chloride complex are left for future research.

关键词： Offshore Sediments Chlorine Gas Removal electroremediation Contaminated Muds Electrokinetic Efficiency

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Surfactant Enhanced Electrorenlediation of Phenanthrene

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Chinese Journal of Chemical Engineering 2003年第1期11卷 73-78页

作者：佘鹏刘铮丁富新杨建刚刘翔 Departmentof Chemical Engineering Tsinghua University Departmentof Environmental Science and Engineering Tsinghua University

Removal of hydrophobic organic contaminants (HOCs) from soil of low permeability by electroremedia-tion was investigated by using phenanthrene and kaolinite as a model system. Tween 80 was added into the purging solution in order to enhance the solubility of phenanthrene. The effects of pH on the adsorption of phenanthrene and Tween 80 on kaolinite and the magnitude of -potential of kaolinite were examined, respectively. The effects of electric field strength indicated by electric current on the electroremediation behavior, including the pH of purging solution, the conductivity, phenanthrene concentration and flow rate of effluent, were experimentally investigated, respectively. In case of an electric field of 25 mA applied for 72 hours, over 90% of phenanthrene was removed from 424 g (dry mass) of kaolinite at an energy consumption of 0.148 kW-h. The experimental results described in present study show that the addition of surfactant into purging solution greatly enhances the removal of HOCs by electroremediation.

关键词： electroremediation phenanthrene polycyclic aromatic hydrocarbon kaolinite electroosmosis

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