New strain of bacteria may help clean oil spill
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![NASA MODIS satellite image, taken May 23, 2010, of the Gulf of Mexico shows the extent of the oil released from the Deepwater Horizon spill. The oil can be seen as a sheen on the water surface. BP was weighing whether to stick with the tricky 'top kill' maneuver or try something else to plug the gushing well that has caused the worst oil spill in U.S. history, its chief operating officer Doug Suttles said on May 29, 2010. [Xinhua/Reuters]](http://images.china.cn/attachement/jpg/site1007/20100612/00114320f5750d7d3ec522.jpg "NASA MODIS satellite image, taken May 23, 2010, of the Gulf of Mexico shows the extent of the oil released from the Deepwater Horizon spill. The oil can be seen as a sheen on the water surface. BP was weighing whether to stick with the tricky 'top kill' maneuver or try something else to plug the gushing well that has caused the worst oil spill in U.S. history, its chief operating officer Doug Suttles said on May 29, 2010. [Xinhua/Reuters]") |
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NASA MODIS satellite image, taken May 23, 2010, of the Gulf of Mexico shows the extent of the oil released from the Deepwater Horizon spill. The oil can be seen as a sheen on the water surface. [Xinhua/Reuters] |
"The real bottleneck to replacing synthetic chemicals with biosurfactants like rhamnolipid is the high cost of production," Yin said. "Most of the strains of Pseudomonas aeruginosa now being used have a low yield of rhamnolipid. But strain NY3 has been optimized to produce a very high yield of 12 grams per liter, from initial production levels of 20 milligrams per liter."
By using low-cost sources of carbon or genetic engineering techniques, it may be possible to reduce costs even further and scale up production at very cost-effective levels, the researchers said.
The rhamnolipids produced by NY3 strain appear to be stable in a wide range of temperature, pH and salinity conditions, and strain NY3 aggressively and efficiently degrades at least five PAH compounds of concern, the study showed.
It's easy to grow and cultivate in many routine laboratory media, and might be available for commercial use in a fairly short time.
"Compared to their chemically synthesized counterparts, microbial surfactants show great potential for useful activity with less environmental risk," the researchers wrote in their report.
"The search for safe and efficient methods to remove environmental pollutants is a major impetus in the search for novel biosurfactant-producing and PAH-degrading microorganisms."
More research to further reduce costs and scale up production would be needed before its commercial use, the researchers added.
