Beach-clogging sargassum doesn’t have to go to landfills. It can enrich soils

Kim Frisbie

Key Points

  • The Great Atlantic Sargassum Belt, a thick mass of leafy, floating seaweed stretching across 5,000 miles of ocean, is forecast to be a nuisance of record-breaking proportions this year.
  • Sargassum is washing ashore on Caribbean and U.S. beaches, including Palm Beach.
  • Sargassum contains high levels of arsenic and heavy metals, organic contaminants and marine debris, all environmental health hazards.
  • Seaweed Greens of West Palm Beach has developed soil-enhancing products from sargassum that could remove it from landfills and help protect coastal ecosystems.

The Great Atlantic Sargassum Belt, a thick mass of leafy, floating seaweed stretching across 5,000 miles of ocean, is forecast to be a nuisance of record-breaking proportions this year.

In May, scientists at the University of South Florida observed more than 37 million metric tons of sargassum in the Caribbean Sea, Atlantic Ocean, and Gulf of Mexico, and it’s coming our way, already washing ashore on Caribbean and U.S. beaches, including Palm Beach.

Sargassum contains high levels of arsenic and heavy metals, organic contaminants and marine debris, all environmental health hazards. When it dries, it releases hydrogen sulfide, a gas that smells like rotten eggs and which can cause respiratory problems. Now, finally, a West Palm Beach company has discovered how to remove these pollutants and turn sargassum into high quality organic fertilizer and other environmentally regenerative products.

Sargassum is a golden-to-reddish brown seaweed, a large macroalgae that forms enormous mats atop the ocean’s currents. Unlike other seaweeds, such as the kelp that’s anchored to the shallow ocean floor, sargassum is a rich, free-floating ecosystem providing habitat, food resources, protection, and breeding grounds to hundreds of marine species. The leaflike blades of algae contain small berry-like air bladders called pneumatocysts that are filled with oxygen and act as mini-buoys to keep the mats afloat.
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