Influence Factors of Remediation of Benzene in Groundwater by Air Sparging

Medium sand was selected as simulation medium. Benzene was chosen as the target pollutant. Soil column simulation experiments were carried out to investigate the effects of influencing factors such as aeration rate, medium permeability and air injection mode on benzene removal efficiency in groundwater. The results showed that the aeration rate and medium permeability affected AS remediation efficiency significantly. The benzene removal efficiency increased with the aeration rate. When the aeration rate exceeded 300 mL•min-1, the removal efficiency did not increase any more. The bigger the hydraulic conductivity was, the higher removal efficiency of benzene was. In the same operation condition, pulsed intermittent air injection had advantages over continuous air injection for benzene •remediation in the medium sand with low hydraulic conductivity.