The Ensolvex process permits the complete removal of organic contaminants from the soil without altering its characteristics, in full compliance with current statutory requirements. The soil is pre-washed to separate the gravel portion. Through this process, the pollutants are concentrated in the clay fraction and only afterwards are treated using the Ensolvex process. The only solvent used in the process is ethyl acetate (ETAC), which is eco-friendly and non-toxic. The solid-liquid contact occurs in a simple and efficient mechanical way. This process allows the separation of the contaminants from the solvent, which is regenerated and is ready to be reused. The residues (i.e. fuel oil from former refineries) can be recovered and recycled. Thanks to its low energy consumption and low environmental impact, the process is very competitive in comparison to other treatment technologies. The environmental impact is much lower than that of thermal treatments, due to the near absence of gaseous emissions (limited only to those from the heater of the distillation unit).
The process is also suitable for the treatment of sea floors.
Plant Treatment Capacity
Ensolvex can treat highly contaminated soils within the limits imposed by DM 471/99 (Italian Law) for reuse in sites destined to public, private and residential green areas, i.e.
Light hydrocarbons C<12 10 mg/Kg
Heavy hydrocarbons C>12 50 mg/Kg
The total capacity of the Ensolvex plant is approximately 35,000 t/month for soils with organic content (i.e. of petrol origin) up to 10,000-12,000 ppm (TPH), with an average silt and clay content of 15%.
The total capacity of the plant decreases with higher percentages of silt and clay present in the soil (i.e. for soils containing 30% silt and clay the total throughput would be approximately 30,000 t/month)