Effectiveness of the Repeat Application of Chemical Dispersants on Oil

Front Cover
Environmental Studies Revolving Funds, 1985 - Dispersing agents - 66 pages
The primary objective of this study was to determine if changes in oil properties or chemical imbalances caused by an initial application of dispersant would reduce the effectiveness of a second application of dispersant. For all the tests conducted, the results show that both the quantity of oil dispersed and the size distribution of the oil drops generated by the second application and mixing sequence were similar to, or better than, those from the initial application of dispersant. Therefore, it appears that the second or repeat application of dispersant is a effective as the first, at least under the conditions present in this study. Measurements of oil properties taken during the study indicate that the dispersion process did not significantly change either the oil's density or its viscosity. These slight changes in oil properties did not reduce the effectiveness of the second application of dispersant. The first application of dispersant resulted in a 75 - 85 % reduction in the oil-water interfacial tension just prior to the second application. Some dispersant therefore remained in the re-surfaced or undispersed oil. The results indicate that the presence of this surfactant neither reduced the effectiveness of the second application nor did it greatly improve the second dispersion.

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Test Results and Discussion
Study data on drop size distributions
Study data on oil concentrations

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