Project is to determine the period of time that oil spill dispersants applied to spilled oil in a calm sea will remain effective before the sea state increases and dispersion occurs. Related work is planned in an ExxonMobil sponsored project coordinated under the Petroleum Environmental Research Forum (PERF). Every effort will be made to coordinate the present study with PERF work. To this end, one of the model oils used in the ExxonMobil PERF study will be included in all phases of testing in the present study.
During the past two years there has been an increased use of dispersants as a response technique to offshore marine oil spills. The US EPA has recently revised the National Project Schedule with regards to dispersants, and the cold water application and performance of these materials has come under critical review.
Project will determine whether chemically treated low-viscosity OCS crude oils disperse in a non-breaking wave environmental and if so, to determine whether there is a limiting oil viscosity for chemical dispersion for OCS crude oils in non-breaking waves.
The project identified potential methods for the removal of dissolved dispersants from Ohmsett tank water using membrane filtration technology. The goal was to lower the dispersant concentration in the tank water to undetectable levels after dispersant effectiveness testing at Ohmsett. Previously, after a series of dispersant test in the Ohmsett tank, the only effective method for removing dissolved dispersant was to entirely drain the tank, then refill the tank, filter the water and add sufficient salt to bring the tank water up to open ocean salinities.
October 2006 Conduct a series of in situ burn experiments on the scale of 50 m2 with chemical herders and crude oil at the Fire Training Grounds, Prudhoe Bay, AK. The burns would be conducted in a specially prepared pit containing broken sea ice.
During the past two years there has been an increased use of dispersants as a response technique to offshore marine oil spills. The U. S. Environmental Protection Agency has recently revised the National Project Schedule with regards to dispersants, and the cold water application and performance of these materials has come under critical review.
This international joint research project is designed to gather data to support decision makers in the process of determining whether dispersants should be used in low energy environments. This information will be useful for dispersant decision making in ice cover (an ice field reduces wave motion) or other calm conditions. Questions to be addressed are: Will the dispersant stay with the oil until there is enough energy to disperse the slick?
How much energy is needed to disperse the slick after dispersants are applied?
The objectives of this research project are twofold. The first is to determine if the results of dispersant effectiveness tests conducted at Ohmsett are consistent with those gathered in the laboratory and under actual at-sea conditions. The project will conduct a series of dispersant effectiveness tests at Ohmsett under identical conditions to those conducted in the at-sea trials done in the UK in 2003. The research will compare the threshold limiting conditions for dispersibility as measured at Ohmsett with those measured in the laboratory and at-sea, under identical conditions.
The U.S. Minerals Management Service (MMS) funded and conducted two series of large-scale dispersant experiments in very cold water at Ohmsett The National Oil Spill Response Test Facility, located in Leonardo, New Jersey in February-March 2006 and January-March 2007. Alaska North Slope, Endicott, Northstar and Pt. McIntyre crude oils and Corexit 9500 and Corexit 9527 dispersants were used in the two test series.
The purpose of the study was to determine the partitioning of different chemical emulsions breakers between oil and water phases when they are used to enhance decanting of recovered water from offshore skimming operations. This proposed effort built upon a previous projects entitled Testing at Ohmsett to Determine Optimum Times to Decant to Temporary Storage Devices (Project 298) and Extending Temporary Storage Capacity Offshore With Emulsion Breakers (Project 395) where S.L.