Migration behaviors of airflow and surfactant in the surfactant-enhanced air sparging process
Technologies of light transmission visualization and staining tracer were used to investigate the migration behavior of the airflow and surfactant during surfactant enhanced air sparging(SEAS)remediation in the gravel aquifer.Experimental results showed that the air saturation in SEAS was 2.4 times higher than that in AS when the air injection rate was the same within a certain air injection rate.Under different air injection rates,the zone of influence(ZOI)area did not significantly change,and the ZOI presented obvious conical shape,and the air flowrate presented Gaussian distribution.Under the same air injection rate,compared with AS process,the ZOI area slightly increased due to the foam stabilization effect and surfactant redistribution.In addition,the surfactant redistribution in SEAS process increased its action range,but reduced the surfactant concentration in the target zone,which increased the risk of pollution plume expansion.These studies are beneficial to in-depth under-standing the enhanced remediation mechanism of SEAS and improving the VCOs removal efficiency.
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