This week, the U.S. Saint Lawrence Seaway Development Corp. will implement new rules designed to reduce
Meanwhile, Congress is considering legislation that would force freighters to install costly onboard sterilization systems to kill foreign organisms in ballast water. The systems use filters, ultraviolet irradiation, chemical biocides and other technologies, and can cost more than $500,000.
The U-M ballast-free ship concept offers a promising alternative that could block hitchhiking organisms while eliminating the need for expensive sterilization equipment, said Michael Parsons, professor of naval architecture and marine engineering and co-leader of the project.
…Ships take on ballast water for stability when they're not carrying cargo. They discharge ballast when they load freight, expelling tons of water and anything else—from pathogenic microbes to mollusks and fish—that's in it.
Instead of hauling potentially contaminated water across the ocean, then dumping it in a
For invasive species, ship's bilges like this one, taken by "Clipper," are the preferred method of travel. Wikimedia Commons