Keywords: passive soil vapour extraction, barometric pumping, remediation technology, unsaturated zone layers, mathematical modelling, low permeability layers, high permeability layers, well screens, displacement, soil contamination, volatile chemicals, soil remediation, environmental pollution
Analytical model for uni–directional flow passive soil vapour extraction system
An analytical one–dimensional model has been developed to examine the uni–directional barometric pumping in passive Soil Vapour Extraction (SVE) system. The model is applicable to a special case in which a radial flow field is insignificant. The system considered contains two unsaturated zone layers, an upper contaminated low permeability layer and a lower high permeability layer contains a well screen. The numerical simulations results show that an increase in upper layer thickness results in increase in cumulative displacement. It is clear that to extract relatively effective amount of air, upper layer thickness should be at least few tens meters.