A method of delivering a treatment substance to a target substance in a treatment zone is disclosed. The method comprises providing a treatment substance responsive to an electric or magnetic field such that the treatment substance experiences a kinetic force when disposed in said field, providing an electric or magnetic field extending through a treatment zone, and disposing the treatment substance in the electric or magnetic field such that the treatment substance moves towards the treatment zone and contributes to a reaction with the target substance. A corresponding system is also disclosed.

The invention relates to a method for removing inorganic compounds from a section of soil. By regulating an electric voltage applied between two or more electrodes (1, 2) disposed in the section of soil (3) to values equal or below the electrokinetic point (61), inorganic compounds are electrochemically modified in situ in such a manner that they are electrokinetically mobilized and can be directly deposited on the electrodes (1, 2). According to the invention, the electrokinetic point (61) is adjusted and reached by applying a voltage to the electrodes (1, 2) and controlling it, once, after passing a first current/voltage zone (62) of a first gradient, a second current/voltage zone (63) of a second gradient that is smaller than the first gradient is reached.

A process is provided for vaporizing volatile contaminants present in soil and removing the contaminant vapors. The process involves heating the soil by passing current between electrodes buried in the soil and simultaneously injecting water through the electrodes to transfer heat by convection. The coupling of electrical heating with heat transfer by convection improves the efficiency and uniformity of heating. The contaminant vapors are removed by applying suction at extraction wells positioned between the electrodes.