Title

Chemical Dispersants: Oil Biodegradation Friend or Foe?

Document Type

Article

Publication Date

7-15-2016

Keywords

Biodegradation, Dispersant, Oil spill, Enhanced dissolution

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.marpolbul.2016.04.044

Abstract

Chemical dispersants were used in response to the Deepwater Horizon oil spill in the Gulf of Mexico, both at the sea surface and the wellhead. Their effect on oil biodegradation is unclear, as studies showed both inhibition and enhancement. This study addresses the effect of Corexit on oil biodegradation by alkane and/or aromatic degrading bacterial culture in artificial seawater at different dispersant to oil ratios (DORs). Our results show that dispersant addition did not enhance oil biodegradation. At DOR 1:20, biodegradation was inhibited, especially when only the alkane degrading culture was present. With a combination of cultures, this inhibition was overcome after 10days. This indicates that initial inhibition of oil biodegradation can be overcome when different bacteria are present in the environment. We conclude that the observed inhibition is related to the enhanced dissolution of aromatic compounds into the water, inhibiting the alkane degrading bacteria.

Comments

Data used in this article are available for download.

Biodegradation of light crude oil using realistic sea water

Was this content written or created while at USF?

No

Citation / Publisher Attribution

Marine Pollution Bulletin, v. 108, issues 1–2, p. 113-119

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