Microwave enhanced stabilization of copper in artificially contaminated soil

Abstract

Microwave processing was used to stabilize copper ions in soil samples. Its effects on the stabilization efficiency were studied as a function of additive, microwave power, process time, and reaction atmosphere. The stabilization efficiency of the microwave process was evaluated based on the results of the toxicity characteristic leaching procedure (TCLP) test. The results showed that the optimal experimental condition contained a 700 W microwave power, 20 min process time and 3 iron wires as the additive, and that the highest stabilization efficiency level was more than 70%. In addition, the different reaction atmospheres showed no apparent effect on the stabilization efficiency of copper in the artificially contaminated soil. According to the result of the Tessier sequential extraction, the partial species of copper in the contaminated soil was deduced to transform from unstable species to stable states after the microwave process.

Keywords

microwave / copper / stabilization

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Acknowledgements

This research was supported by the Key Projects in the National Science & Technology Pillar Program in the Eleventh Five-year Plan Period (No. 2006BAJ04A07), the National Water Pollution Control Technology Major Projects (No. 2008ZX07421-002), and Professor Yoshikawa’s research fund.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg