System Effects on Benzene Removal from Saturated Soils and Ground Water Using Air Sparging

Abstract

This paper presents the results of a laboratory investigation performed to study the role of various air sparging system parameters on the removal of benzene from saturated soils and ground water. A series of one-dimensional column experiments was conducted with predetermined contaminant concentrations and predetermined injected air flow rates and pressures to investigate the effects of: (1) the soil type; (2) the use of pulsed air injection; and (3) the synergistic effects of co-contaminants on air sparging removal efficiency. This study demonstrated that the grain size of the soils affects the air sparging removal efficiency. A threshold value exists for effective particle size (D10), which is equal to 0.2 mm; above this threshold value, the rate of removal is linearly proportional to the D10 value; while below this value, there is a drastic increase in the time required for contaminant removal. Additionally, it was demonstrated that pulsed air injection did not offer any appreciable advantages over con...