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Dispersant Recovery

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Dispersants to clean oil The use of dispersants in the recovery The effect of the dispersants on the recovery The recovery from the dispersants

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Dispersant The main dispersant used in Gulf was Corexit 9500 and Corexit 9527, produced by Nalco Nalco portrays itself as a company striving for sustainable solutions to industrial problems. The dispersants work by both being attracted to the water and oil to lower the surface tension of the oil slick to allow for the oil to dissolve. dioctyl sodium sulfosuccinate is the component that has taken the longest to break down in the gulf water.

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Use Dispersants were originally sanctioned by the EPA Lisa Jackson, EPA administrator, acknowledges that, "So far the data show we haven't done any damage and actually we've helped with dispersion and used a lot less of the chemical in the process (nola.com) Used then under the surface, never done before. Lisa Jackson "none of the testing that was done prior to this incident was what I'd call extensive and geared toward the long-term effects or effects in the sub-sea. (nola.com) The idea was to break up the oil before it reached the surface.

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Effects Broke up the oil on the surface. Intended to let oil settle to the bottom Created large dead zones 2 inches of oil on the sea floor. Discovered by Samantha Joye of the university of Georgia This is killing many of the filter feeders living on the bottom of the sea. Samantha Joye, only about 10% of the oil was consumed by microbes gulfblog.uga.edu

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Nalco Nalco Material Safety Data Sheet. Do not take internally Handle with protective clothing and gloves Use respirator or half face mask when concentrations exceed given limits 5-10 Mg/m^3 States that none of the component are listed as know carcinogens It does have the tendency to bio accumulate All this information is for short term spills, not months of exposure The report states that human risk is low http://www.lmrk.org/corexit_9500_uscueg.539287.pdf

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Affects Not being broken down The reduction to concentration is due to the dilution over the vast area of the Gulf. Human illness Exposure comes from inhalation, ingestion, and skin or eye contact Nalco Material Data Safety Sheet BIOACCUMULATION POTENTIAL: Component substances have a potential to bio concentrate http://www.lmrk.org/corexit_9500_uscueg.539287.pdf

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Lessons BP took control of the cleanup Need an organization with broader concerns BP stock prices (msnbc.com)

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Alternatives No Dispersants Environmentally friendly dispersant Dispersit, made by PolyChem Water based 100% effective on Louisiana crude by EPA Corexit is 54% BP tested small amounts but never ordered a significant supply.

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Closing Dispersant used Problems Recovery from dispersant Lessons/ alternatives

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Questions

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Reference Collage http://www.itopf.com/spill-response/clean-up-and-response/dispersants/ http://www.itopf.com/spill-response/clean-up-and-response/dispersants/ http://www.businessinsider.com/16-burning-questions-about-the-oil-spill-that-we-deserve-some-answers- to-2010-6?op=1 http://www.businessinsider.com/16-burning-questions-about-the-oil-spill-that-we-deserve-some-answers- to-2010-6?op=1 http://www.suite101.com/content/gulf-oil-spill-dispersant-rally-clean-gulf-a297695 http://www.suite101.com/content/gulf-oil-spill-dispersant-rally-clean-gulf-a297695 http://www.wired.com/wiredscience/2010/06/dispersant-confusion/ http://www.wired.com/wiredscience/2010/06/dispersant-confusion/ http://www.examiner.com/environmental-health-in-tampa-bay/gulf-oil-spill-clean-up- methods-push-1-84-million-gallons-of-toxic-chemicals- across-tampa-florida http://www.examiner.com/environmental-health-in-tampa-bay/gulf-oil-spill-clean-up- methods-push-1-84-million-gallons-of-toxic-chemicals-across-tampa-florida http://www.popsci.com/science/article/2010-05/how-do-oil-dispersants-work http://www.popsci.com/science/article/2010-05/how-do-oil-dispersants-work http://www.salon.com/news/feature/2011/02/20/bp_oil_spill_lingers http://www.salon.com/news/feature/2011/02/20/bp_oil_spill_lingers Articles http://www.nytimes.com/gwire/2011/01/27/27greenwire-study-undersea-dispersant-in-gulf- of-mexico-li-64092.html http://www.nytimes.com/gwire/2011/01/27/27greenwire-study-undersea-dispersant-in-gulf- of-mexico-li-64092.html http://news.mongabay.com/2011/0221-hance_oilspill.html http://news.mongabay.com/2011/0221-hance_oilspill.html http://www.nola.com/news/gulf-oil- spill/index.ssf/2010/06/subsea_dispersants_the_ricght.html http://www.nola.com/news/gulf-oil- spill/index.ssf/2010/06/subsea_dispersants_the_ricght.html http://www.commondreams.org/headline/2010/10/27-8 http://www.commondreams.org/headline/2010/10/27-8 http://www.lmrk.org/corexit_9500_uscueg.539287.pdf http://www.lmrk.org/corexit_9500_uscueg.539287.pdf