Evaluation of Reclaimed Drywall for Soil Amendment and Carbon Sequestration
1 online resource (188 pages) : PDF
University of North Carolina at Charlotte
Construction and demolition (C&D) activities produce 170 million tons of waste annually (US EPA 2009), 15% of which are drywall. Drywall from construction activities, virgin material too small to be reused and often disposed in landfills, is estimated at 1.7 million tons each year (Sandler 2003). Drywall in landfills leads to hydrogen sulfide emissions that can be lethal (Lee et al. 2006; Flynn 1998). The goal of this research was to evaluate two diversion options for reclaimed drywall: (i) as a soil amendment; and (ii) as a carbon sequestration driver. Canola, sunflower, wheat, and grass plants were amended with different doses of ground drywall. While the drywall did not significantly impact sunflower and grass growth, wheat seed yield increased 20%, and canola yield almost doubled relative to controls with no drywall amendment. Phytotoxicity tests performed on different drywall types revealed the potential inhibition effects of using mold and moisture resistant drywall as soil amendment, suggesting that careful sorting of reclaimed drywall may be necessary before land application. Wheat and corn amended with 3,208 kg S ha-1 as ground drywall in a climate receiving less than 33 in y-1 of rain proved able to sequester atmospheric carbon at a rate of 650 kg ha-1 y-1. Presumably the plants transported atmospheric carbon to the soil via rhizosphere respiration, where the carbon reacted with drywall calcium to form calcium carbonate. This sequestration was confirmed by carbon isotope analysis.
CALCIUM CARBONATECANOLACARBON SEQUESTRATIONC&D WASTEDRYWALLSOIL AMENDMENT
Infrastructure & Environmental Systems
Daniels, JohnEppes, MarthaMcMillab, SaraBender, John
Thesis (Ph.D.)--University of North Carolina at Charlotte, 2013.
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