Biostimulation for the Treatment of an oil-contaminated Coastal Salt Marsh |
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| Authors: | Susana Garcia-Blanco Albert D Venosa Makram T Suidan Kenneth Lee Susan Cobanli John R Haines |
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| Institution: | (1) Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221-0071, USA;(2) U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Cincinnati, OH 45268, USA;(3) Bedford Institute of Oceanography, Fisheries and Oceans Canada, B2Y 4A2 Nova Scotia, Canada |
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| Abstract: | A field study was conducted on a coastal salt marsh in Nova Scotia, Canada, during the summer of 2000. The objective of the
study was to assess the effectiveness of biostimulation in restoring an oil-contaminated coastal marsh dominated by Spartina alterniflora under north-temperate conditions. Three remediation treatments were tested with two additional unoiled treatments, with and
without added nutrients, serving as controls. This research determined the effectiveness of nitrogen and phosphorus addition
for accelerating oil disappearance, the role of nutrients in enhancing restoration in the absence of wetland plants, and the
rate at which the stressed salt marsh recovered. Petroleum hydrocarbons were analyzed by gas chromatography/mass spectrometry
(GC/MS). Statistically significant treatment differences were observed for alkanes but not aromatics in sediment samples.
No differences were evident in above-ground vegetation samples. GC/MS-resolved alkanes and aromatics degraded substantially
(>90% and >80%, respectively) after 20 weeks with no loss of TPH. Biodegradation was determined to be the main oil removal
mechanism rather than physical washout. |
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| Keywords: | bioremediation biostimulation crude oil hydrocarbons nutrients nutrient persistence salt marshes |
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