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2007 Ground Water Summit |
Monday, April 30, 2007
4:30 p.m. - 7:30 p.m.
Tuesday, May 1, 2007
9:30 a.m. - 1:30 p.m.
Tuesday, May 1, 2007
4:30 p.m. - 7:30 p.m.
The Effect of Surfactant on Contaminant Removing for Air Sparging
Air sparging (AS) removes volatile organic contaminants from a saturated zone by a combination of volatilization and aerobic biodegradation. Microbubbles is an Innovative technology for ground water remediation. The injected air is dispersed as lots of microbubbles and fills with the whole porous of soil. It would increase the reactive area of gas-liquid phase and reduce the volume of injected gas. This study designed a microbubble generator and an experimental system for groundwater remediation. Surfactant is used in this study to understand the effect of surfactant on contaminant removing for air sparging. This study used SDS (sodium dodecyl sulfate) and mixed with water to become a 0.1% (w/v) solution. The results of column tests show that the surfactant increases the concentration of microbubbles in water. It also reduces the microbubbles’ grain size. This phenomenon is helpful to disperse the microbubbles in water and form the bubble-flow instead of the channel-flow. Moreover, this study got some samples from water, bubble film and air of bubble, and analyzed these samples by GC (Gas Chromatograph). The results showed that the SDS did not stop the transportation of benzene from water to air. This study indicated that the surfactant enhances the distribution of injected air and not breaks off the contaminant removal.