Abstract
AbstractThe purpose of this research was a large‐scale project, of an on‐farm remediation of cadmium‐contaminated silty loam by an electrokinetic treatment process in Taiwan. The electrokinetic (EK) treatment process is a useful remedial technology, particularly for soil with low permeability. This pilot test farm implements EK technology to remove heavy metal Cd from the silty loam in rice paddies, and evaluates the removal efficiency of the Cd, as well as soil fertility enhancement during the EK treatment process. A citric acid–surfactant mixture was used as the treatment solution, applied under an electrical current, to improve the removal of the Cd, while simultaneously enhancing the fertility of the silty farm soil. The test results revealed that the EK process gained a Cd removal efficiency of 76.6%; in addition, the contents of organic matter, total nitrogen, Bray‐1 phosphorus, and exchangeable potassium and magnesium were relatively elevated after 92 days of treatment duration. This study concluded that the on‐farm EK treatment technology would be capable of mitigating soil contaminated with not only heavy metals, but also organic compounds in the future. Copyright © 2008 John Wiley & Sons, Ltd.
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