Surfactin foams: Uniform and Steady State in Foam-Generator
Wicaksono, G. Aryo
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This Study was initiated by generating foams from biosurfactant surfactin in a foam-generator which then used to remediate contaminated soil in column by flushing technology. Focus of this paper was to evaluate the dynamic performance of surfactin foam generation, in particular reaching the uniform and steady state condition in the foam-generator. The condition was recorded by observing the level of liquid-height phase as a function of time. The experimental results demonstrated that for surfactin at concentrations of 1 cmc (critical micelle concentration) and 3 cmc with the same flow rate (2 ml/min), a uniform and steady state condition was reached after 20 minutes. Increasing the concentration from 1 cmc to 3cmc, one could increase the foam capacity about 12.5%. By changing the flow rate from 2 ml/min to 3 ml/min for surfactin with a concentration of 3cmc, it was found that the time scale to reach the uniform and steady state became shorter, but with a slight decrease in the foam capacity. In addition, the steady condition seemed uncharged when the foam was flowed into the flushing remediation column.