Abstract
This study describes the decomposition of polychlorinated biphenyls (PCBs) in soil with dispersion mixtures of metallic calcium (Ca) and calcium oxide (CaO) at different temperatures. In these experiments, naturally moisturized and contaminated soil (1.0 g [31 ppm PCBs]), CaO (dried 2.0 wt%), and metallic Ca (0.01 g [0.25 mmol]) were introduced into a stainless steel pressure reactor under 0.1 MPa N2 gas. The mixtures were stirred magnetically and heated at 260, 280, and 300 °C, respectively. Soil treatment with metallic Ca and CaO under various temperature conditions is extremely effective for degrading existing PCBs. Decomposition resulted from dechlorination (DC). Initial moisture in soil acted as a hydrogen source during stirring. Soil moisture can be beneficial for hydrodechlorination in the presence of metallic Ca and CaO. Furthermore, metallic Ca and CaO can greatly increase the number of collisions and mutual refinement. Treatment at 260, 280, and 300 °C combined with metallic Ca and CaO is effective for the decomposition (approximately 95 % DC) of PCBs in soil under natural moisture conditions.
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Acknowledgments
The authors gratefully acknowledge financial support for this study from the Industrial Technology Research Grant Program (Grants No. 04A47002 and 09B35003a) of the New Energy and Industrial Technology Development Organization of Japan and a Grant-in-Aid for Scientific Research (B) [KAKENHI: 20310046] from the Japan Society for the Promotion of Science. Special thanks are given to NHI Co., Ltd., Nihonkai Environmental Service Inc., and Sankyo Kosan Co., Ltd.
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Mitoma, Y., Mallampati, S.R., Miyata, H. et al. Decomposition of Polychlorinated Biphenyls in Soil With a Dispersion Mixture of Metallic Calcium and Calcium Oxide. Arch Environ Contam Toxicol 64, 180–186 (2013). https://doi.org/10.1007/s00244-012-9829-5
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DOI: https://doi.org/10.1007/s00244-012-9829-5