Abstract
Amongst environmental contamination problems, soil contamination with metals and metalloids may represent a big threat due to the high toxicity and widespread presence of mining activities. Electrokinetic (EK) process relies on the application of a low level direct current between electrodes in a partially saturated or even saturated soil and appears as a promising in situ strategy for fine-grained contaminated soils. Due to its mobilization potential, EK process can be considered as an integrated tool for contaminants removal, alone and coupled with phytoremediation. The coupling of EK process with phytoremediation (also known as EK-assisted phytoremediation) is an innovative technique that deserves a deeper knowledge to enlarge the scope of EK application. The EK-enhanced phytoremediation aims to use the presence of plants to counteract the effects of the electric current as it brings most of the benefits of a “regular” phytoremediation scheme (e.g., recovery of soil properties and improvement of its structure).
Arsenic (As) is ubiquitous in the environment and highly toxic to all life forms. One of the most important anthropogenic sources of As in the environment is the mining and special attention has been paid to the environmental management of As-bearing mining sites throughout the world.
This chapter aims to give an overview on the results achieved so far on EK remediation of soil contaminated with As. The results obtained by the group on EK remediation, phytoremediation, and EK-assisted phytoremediation of a mine soil, China, contaminated with arsenic will also be summarized and discussed.
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Acknowledgements
Financial support was provided by FP7-PEOPLE-2010-IRSES-269289-ELECTROACROSS—Electrokinetics across disciplines and continents: an integrated approach to finding new strategies for sustainable development and PTDC/ECM/111860/2009—Electrokinetic treatment of sewage sludge and membrane concentrate: Phosphorus recovery and dewatering and National Natural Science Foundation of China (21177135). RIARTAS-Red Iberoamericana de Aprovechamiento de Residuos Industriales para el Tratamiento de Suelos y Aguas Contaminadas, Programa Iberoamericano de Ciencia y Tecnología para el Desarrollo (Cyted). N. Couto acknowledges Fundação para a Ciência e a Tecnologia for her Post-Doc fellowship (SFRH/BPD/81122/2011).
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Guedes, P.R., Couto, N., Ribeiro, A.B., Zhou, DM. (2016). Phytoremediation Coupled to Electrochemical Process for Arsenic Removal from Soil. In: Ribeiro, A., Mateus, E., Couto, N. (eds) Electrokinetics Across Disciplines and Continents. Springer, Cham. https://doi.org/10.1007/978-3-319-20179-5_16
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