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Storm may help dissolve US Gulf oil mess

Oil sheen is seen with vessels assisting near the source of the BP Deepwater Horizon oil spill on July 23, 2010 in the Gulf of Mexico off the coast of Louisiana. Photo courtesy AFP.

Mozambique's Mozal to remove pollution filters from smelter
Maputo (AFP) July 23, 2010 - Mozambican aluminium giant Mozal will remove pollution filters from its smelter for six months in order to rebuild its systems for limiting gas emissions, its president said on Friday. But Mozal president Mike Frazer told a news conference that the release of unfiltered gases from the plant outside Maputo would not cause any damage to people or the environment. "This is not a significant event that will cause any impact on the environment or the people who live in the area," he said at the plant. "Our environment management report found emissions are way below international standards."

Owned jointly by Australia's BHP Billiton and the Mozambican government, the aluminium smelter was launched in 2000 and produces 506,000 tonnes per year. At a cost of 1.34 billion dollars (one billion euros), at the time it was the largest single investment in the southern African country. Aluminium from the smelter accounts for more than half of Mozambique's exports. Frazer acknowledged that poor planning led to deterioration of the filters, which will be removed for six months from November. "Engineering around these treatment centres was suboptimal for the operations that we have now," he said. Tar and other chemical emissions will rise from two tonnes per year to 22 tonnes per year, independent consultant Sean O'Beirne told reporters, but he added that this still falls within international standards.
by Staff Writers
Miami (AFP) July 25, 2010
The storm which forced a temporary halt to efforts to permanently seal BP's Gulf of Mexico oil well may help dissolve the millions of gallons of spilled crude sloshing around in the sea, experts say.

Bonnie unexpectedly weakened to tropical depression status when it reached the spill zone on Saturday -- strong enough to kick up waves, but too weak to justify BP keeping away its key drill rig, which it sent back to restart work to permanently "kill" the well.

The storm drenched southern Florida on Friday but lost force as it crossed the peninsula and failed to regain strength over the open water as forecasters had predicted.

But the high waves it stirred could help the process of naturally bio-degrading the spilled oil, said Jane Lubchenco, who heads the National Oceanic and Atmospheric Administration (NOAA).

"We expect that Bonnie should help dissipate and weather the oil that's at the surface, it will spread the surface slick out and thereby lower concentrations," Lubchenco told reporters.

"It's expected to break tar patches and tar mats into smaller tar balls, which means faster weathering and faster natural bio-degradation."

The storm "will also cause more natural dispersion, again lowering the concentration and making it more available to natural bacteria that are in the water," she said.

NOAA experts do not expect much upwelling, or below the surface mixing, because Bonnie is moving so quickly, she said.

The remnants of Bonnie are set to hit Louisiana in the northern Gulf Coast late Saturday or early Sunday, the Miami-based National Hurricane Center said.

Laurent Cherubin, an oceanographer at the University of Miami, said rough seas would likely to help break the oil slicks and make them less traceable and more diluted in the water, but that did not mean the problem was resolved.

"That could be a good visible thing but the threat remains for the environment at the invisible level," Cherubin told AFP.

He noted that microorganisms were still dying and the whole ocean food chain was destroyed at its base.

"Therefore, although the threat could visually disappear, it will increase the threat to small organisms by increasing the contamination due to the breaking in smaller parts of the oil," Cherubin said.

"Although animals would leave because of the storm, their food supply could be strongly depleted," he said.

Peter Ortner, director of the Cooperative Institute for Marine and Atmospheric Studies at the University of Miami, agreed with the assessment.

"Degradation of the oil might be accelerated by enhanced mixing and even re-exposure to oxygen in some areas," he told AFP.

Ortner said that one of the few "significant positive" aspects of the storm is that on the western side of Bonnie's landfall "oil that was nearing the shore will be driven offshore, and beaches and coastlines could well be cleaned up by the heavy rains and offshore directed winds."

Manhar Dhanak, director of the Institute for Ocean and Systems Engineering at Florida Atlantic University, warned however that the surface currents bolstered by winds were likely to shift the near-surface oil closer to the Louisiana coast and spread it over a larger area.

Waves from Bonnie "and associated wave-breaking will cause major amount of mixing and dispersion so that the layer of oil at the surface will get thicker," Dhanak said.

On balance Bonnie is "making things different," Lubchenco said.

"I think there is definitely a positive aspect, but different parts of the shore will see different things," she said. "It depends on where you are. I think the bottom line is it's better than it might have been."

The International Energy Agency estimates that between 2.3 million and 4.5 million barrels of crude are now in the sea as a result of the leak.

The oil spill began after an explosion April 20 on a BP-leased Deepwater Horizon rig. The blast killed 11 workers, and the sinking rig unleashed an oil gusher that has grown into the worst environmental disaster in US history.

BP finally capped the well in mid-July, halting the oil from flowing into the Gulf, but a permanent solution to the leak in the form of relief wells remains weeks away.

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Beijing (AFP) July 22, 2010
Chinese authorities battled Thursday to contain an oil spill on the country's northeast coast amid reports it was spreading and as warnings emerged of a heavy long-term environmental impact. The government has mobilised hundreds of fishing boats and other vessels to clean up the spill that occurred in the port city of Dalian, but Greenpeace said many people thrown into the effort were reduce ... read more

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