Research / Research

Solidifying the Scientific Capabilities of Ohmsett - Effect of Ambient Chemical Levels

Project Number
1044
Program
Progress Date
11/10/2016
Category
Performing Activity
Principal Investigator
Dr. Michel Boufadel
Contracting Agency
Bureau of Safety and Environmental Enforcement
Estimated Completion Date
12/07/2016
Description

It has been argued that the presence of surfactants on the water surface of wavetanks from prior dispersant applications prevents the spreading of oil within the tank. It is further argued that the dispersant effectiveness (DE) measured in wavetanks could be severely reduced in comparison to the DE of the same dispersants at sea. Previous research has agreed with this argument and has advocated the flushing of the wavetank to ensure that no surfactants are present at the water surface. As this is not feasible for the Ohmsett tank due to its large size, this project evaluated the effect of residual surfactants and other ambient chemicals in the tank water, and their impact on dispersant testing in the Ohmsett tank.

Latest progress update

This project has been completed. 
 
Dispersant effectiveness testing conducted by a Baffled Flask Test using both synthetic seawater and water from Ohmsett showed that Ohmsett water produced a more effective dispersion. This is attributed to Ohmsett water having a lower hardness that synthetic seawater and ocean water (4,700mg/L of CaCO3 vs. 6,500mg/L of CaCO3). Also, it is believed that trace amounts of surfactant from previous test contributed a negligible change in effectiveness when testing at Ohmsett.

Status
Completed
Associated Attachments
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1044AA, 2016.