Impact du changement d'échelle, des carbonates et du chrome sur la décontamination des sols par électrocinétique
This study has three specific goals: to describe the effects of scale, carbonates and chromium on electrokinetic soil processing. A more general goal is to describe the migration of heavy metals while the soil is being processed. To reach these goals, twelve tests were made using a one liter apparatus, and one test was made using a 100 liter apparatus. Two industrial soils and two spiked soils were tested. The soils were mainly contaminated by chromium, zinc, lead, copper, or a combination of these heavy metals. The change in scale has a significant impact on energy consumption. In fact, it has been shown that the energy density required is proportional to the distance between electrodes. Whether in a soil processing plant or in situ, the space between electrodes should be reduced as much as possible. Soils containing a high amount of carbonates can be decontaminated by electrokinetics and it seems that the energy required increases with the carbonate content. In the future, efforts should be made to reduce the energy consumption associated with the remediation of this type of soil. With regard to electrokinetic soil processing, it seems that chromium behaves like lead, and possibly like other heavy metals. Experimental observations throughout this study allow to describe, in a general manner, the migration of heavy metals and other ionic species involved in electrokinetic soil processing.
- Génie – Mémoires