Discarded glass became the unlikely starting point for a Florida student’s experiment in oyster reef restoration. Delaney Peterson, a Belleview High School student, investigated how the size of aggregate material affects oyster spat recruitment, examining whether recycled foamed glass could provide a suitable hard surface for young oysters to settle. Her project explored the potential of turning a waste material into a substrate for oyster habitat, while Florida’s broader restoration efforts show why suitable hard surfaces are important. According to the Florida Department of Environmental Protection , oyster larvae settle on hard structures and successive generations can build reefs on these surfaces. The agency uses recycled oyster shell as a substrate for oyster reef restoration in the Pensacola Bay System.
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From waste glass to oyster habitat
Peterson's project centred on recycled foamed glass aggregate, a lightweight, porous material made by processing discarded glass. Its air-filled structure gives it a lower density than conventional stone while retaining a hard surface that could potentially provide oysters with somewhere to settle. She investigated whether this waste-derived material could be used in artificial reefs, where young oysters, known as spat, attach to hard surfaces and grow. The idea was to give discarded glass a second use while creating a potential foundation for new oyster habitat. According to UF/IFAS , oyster restoration relies on hard substrates such as recycled oyster shell, but the availability of suitable shell can be limited. This has encouraged the search for alternative materials, placing Peterson's research at the intersection of waste reuse and oyster-reef restoration.
A project that developed over several years
The foamed-glass project was not Peterson's first study of oyster restoration. Her earlier research examined whether the size of aggregate used in artificial reef structures affected oyster spat recruitment. That work led her to investigate different materials and their ability to provide surfaces for young oysters.
According to the International Science and Engineering Fair (ISEF) project , Peterson’s research investigated recycled foamed glass aggregates as a potential material for artificial oyster reefs. The idea addresses an important requirement of oyster reef formation: larvae need a hard surface on which to settle and develop. Florida’s Department of Environmental Protection notes that oyster larvae settle on hard structures such as existing reefs, rocks, pilings, downed trees and recycled oyster shell. Soft substrates such as mud and sand are unsuitable for successful settlement. Once oysters establish themselves, successive generations can settle on the developing structure, allowing reefs to expand over time.
Why oyster reefs matter
Peterson's research matters because oysters play an important ecological role in coastal waters. As filter feeders, oysters remove suspended particles from the water, while their reefs provide shelter and feeding grounds for fish, crabs and other marine organisms. Reef structures can also reduce wave energy and help protect vulnerable shorelines. In Florida, restoration projects use materials such as oyster shell, limestone and other hard substrates to provide surfaces where new oysters can settle and grow. Peterson's approach offers another possibility: using recycled foamed glass as an alternative reef substrate while giving discarded glass a second use. If the material can support oyster settlement and remain stable in marine conditions, it could potentially contribute to restoration efforts while reducing reliance on conventional substrates. However, its durability, ability to support oyster recruitment and environmental safety would need to be evaluated further before it could be considered for large-scale restoration.
The project brought together two environmental challenges: the need for suitable materials in oyster habitat restoration and the potential reuse of waste glass. According to the Society for Science , Peterson’s project, titled “Revolutionising Artificial Reefs: Recycled Foamed Glass Aggregates as a Sustainable Solution for Oyster Habitats, Year 3,” received a Third Award of $1,200 at the 2026 Regeneron International Science and Engineering Fair. By testing recycled foamed glass as a potential material for oyster habitats, the project explored whether a waste material could also serve a useful role in marine restoration.
The research ultimately points to a broader idea in conservation: restoration materials do not always have to come from newly extracted resources. Reusing waste products such as foamed glass could offer an additional tool for rebuilding oyster habitat while supporting efforts to reduce material waste. Although more testing is needed to determine whether the approach is practical and environmentally safe at larger scales, Peterson's work suggests that solutions to different environmental problems can sometimes be combined into a single restoration strategy.
