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Calcium Carbonate in Waste Flooring for Neutralization of Acid Rock Drainage
Acid rock drainage (ARD) was successfully neutralized in this study using carpet tiles. Most polyolefin-based carpet tiles contain over 65% of finely ground calcium carbonate (CaCO(3)) powder by weight in the compound-blended and extruded backing structure; therefore, using them for neutralization i...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9925920/ https://www.ncbi.nlm.nih.gov/pubmed/36819894 http://dx.doi.org/10.1007/s10230-023-00926-6 |
Sumario: | Acid rock drainage (ARD) was successfully neutralized in this study using carpet tiles. Most polyolefin-based carpet tiles contain over 65% of finely ground calcium carbonate (CaCO(3)) powder by weight in the compound-blended and extruded backing structure; therefore, using them for neutralization is an innovative way to reuse a difficult-to-recycle complex and abundant product. The overall neutralization efficiency potential was calculated at 40% based on the density, purity, and surface images that display the domains of CaCO(3) on the tiles. The carpet backing increased the mean of proton activity of AMD collected from a single acidic stream point within the Pinkerton Run tributary near Pittsburgh, PA from 3.3 to 6.1 over the span of four hours in batch-method experiments at CaCO(3) loading levels of 0.1 g/L and overall surface area exposure of 229 mm(2)/mL. Hot acidity levels decreased from 90 to less than 10 mg CaCO(3)/L, and below detection limits after 20 h of neutralization. The treated and neutralized AMD sample contained 80 mg/L more calcium than the untreated, non-neutralized control, demonstrating the dissolution of CaCO(3) from the carpet tile. |
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