4. Soil: an open, multiphase, transient reactor

The presentation of physico-chemical treatment processes shows that they are based on classic process engineering unit operations: thermal treatments, inter-phase transfers, chemical reactions, etc. The major difficulty compared with conventional operations is that we are dealing with a natural anthropized environment, in all its complexity. The major difficulty in comparison with conventional operations is that, at the field scale, we are dealing with an anthropized natural environment, in all its complexity. In all cases, the treated soil can be considered as a multiphase reactor subject to the laws of thermodynamic equilibrium, chemical, biochemical and matter transfer kinetics, and heat transfer, all under given hydrodynamic and phase contact conditions [13] .

Even if sizing...