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Researchers test sediment-scrubbing technology

Features | October 1, 2008 | By:

The testing was conducted at the Cocheco River in New Hampshire.

In a mud flat at the edge of the Cocheco River, just outside downtown Dover, N.H., scientists from the University of New Hampshire’s Contaminated Sediments Center are testing an innovative way to treat polluted sediment in coastal waterways.

Rather than dredging up the problem, or burying it under several feet of sand, they’ve created a patchwork of black geotextile composite mats designed to cap and stabilize pollution in place (Photo 1). Photo 1 | University of New Hampshire researchers Kevin Gardner and Jeffrey Melton and UNH students placed geotextile mats on a mud flat at the edge of the tidal Cocheco River in Dover, N.H. Photo by Lisa Nugent, UNH Photo Services. During the next 2 years, UNH associate professor Kevin Gardner, research assistant professor JeffreyMelton, and a team of UNH students will monitor these mats to evaluate the effectiveness of this new approach.

“We need to know how these mats behave when they’re buried under mud for a few years, compared to how they performed in the lab,” says Melton. “What will happen to them in this intertidal zone with boats, waves, birds, and weather? How will they impact bugs and other aquatic life in the sediment?”

The mats are 6ft2 and 1-in.-thick. They consist of a mixture of reactive materials sandwiched between 2 layers of geotextile fabric (Photo 2), creating a sort of quilt that traps pollutants but allows water to flow through. Photo 2 | A close-up of the geotextile mats: Reactive substances are distributed through a lofty fiber, trapping and treating pollutants in the contaminated sediment. Photo by Lisa Nugent, UNH Photo Services. The reactive “filling” of this quilt contains 3 different substances that bind and stabilize different pollutants. One substance—a UNH-patented technology based on a natural form of phosphorus—treats toxic heavy metals associated with industrial pollution such as lead, copper, zinc, and cadmium.

“But you don’t just find one pollutant at a site,” says Melton.“Everything is all mixed up in the sediment.” So he and his colleagues added organoclay and activated charcoal (“like in yourBritta® filter,” he says), which adhere to and treat toxic chemicals such as polychlorinated biphenyls (PCBs), polyaromatichydrocarbons, (PAHs), and petroleum products that routinely enter waterways through stormwater runoff.

The project is funded by the Cooperative Institute forCoastal and Estuarine Environmental Technology (CICEET), a partnership of UNH and the National Oceanic and AtmosphericAdministration, and NH Sea Grant.

“Polluted sediment is a nationwide problem,” says RichardLangan, CICEET’s UNH codirector. “We need better tools to identify and treat areas where this pollution has the potential to threaten human and ecosystem health. Technology demonstrations like these, that take advantage of cutting-edge science, are key to making that happen.”

Geotextile mats present an alternative approach to remediating contaminated sediment; more common responses include dredging or capping sediment beneath several feet of sand. But dredging is expensive, disrupts habitats, and poses the problem of how to move, and where to put, all that toxic sediment. Sand caps have questionable long-term effectiveness and can hinder boat traffic and impact aquatic life. “There’s no silver bullet. What we are exploring is potentially a great tool to add to the toolbox,” says Melton.

Melton admits that even as Americans grow increasingly aware of environmental woes, sediment pollution does not score high on the “green glamour” scale. Yet, he points out, everyone is already feeling its impact through regular advisories that close shellfish beds or warn of eating fish contaminated by heavy metals and persistent organic pollutants such as PCBs or PAHs.

“You can enjoy a great day of fishing, but if you can’t eat the catch, there’s aproblem,” says Melton. It’s estimated that 20% of the top 6in. of all sediment in U.S. rivers, lakes, streams, and estuaries is contaminated. In 2004, the U.S. Environmental Protection Agency reported there were 3,221 fish consumption advisories in state waters.

Melton and Gardner chose the Cocheconot because its sediment is especially polluted, but because its characteristics as a well-used tidal river and its proximity to UNH make it an ideal laboratory.They plan to compare the performance of the mats in the Cocheco to those they’ve laid in Cottonwood Bay in Grand Prairie,Texas, adjacent to the Dallas National Air Station, in a demonstration funded by theDepartment of Defense’s Strategic Environmental Research and Development Program (SERDP).

Moving forward, researchers from the Contaminated Sediments Center, part ofUNH’s Environmental Research Group, plan to test new sampling technologies that measure the scope and potential threat of contamination in sediment. In addition, they’re always on the lookout for new test sites.

To learn more about UNH’s Contaminated Sediments Center, go to:

Beth Potier is a staff writer/editor with the University of New Hampshire’s Media Relations Department.

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