New Orleans recycles glass to rebuild coastline
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In New Orleans, Louisiana, the organisation Glass Half Full is crushing discarded glass bottles and transforming them into sand for coastal restoration projects.
Founded in 2020 by Tulane University students Franziska Trautmann and Max Steitz, the initiative began as a small-scale operation and has expanded to process about two tons of glass per hour. Glass Half Full collects glass through drop-offs and pickups, diverting it from landfills and providing material for construction, disaster relief, and especially, rebuilding Louisiana’s shrinking wetlands.
Louisiana’s coastline is losing land, creating a need for restoration materials. While dredging from the Mississippi River is commonly used, researchers at Tulane University are investigating whether recycled glass can supplement these efforts. They are currently comparing the growth of vegetation on constructed islands using either dredged river sand or a mixture of river sand and recycled glass sand.
The research, part of a larger programme called ReCoast, focuses on how plants respond to the glass sand and where it can be most effectively used. Scientists have found that some wetland plants struggle to grow in glass sand alone, so they are experimenting with mixing it with nutrient-rich sediment and beneficial microbes to encourage plant establishment and long-term wetland stability. Glass Half Full has already collaborated on projects with Big Branch Marsh National Wildlife Refuge and the Pointe-au-Chien Tribe.
