| Title |
Calcium Carbonate in Waste Flooring for Neutralization of Acid Rock Drainage |
| ID_Doc |
23871 |
| Authors |
Bram, L; Klemetsrud, B |
| Title |
Calcium Carbonate in Waste Flooring for Neutralization of Acid Rock Drainage |
| Year |
2023 |
| Published |
Mine Water And The Environment, 42, 1 |
| DOI |
10.1007/s10230-023-00926-6 |
| Abstract |
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 (CaCO3) 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 CaCO3 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 CaCO3 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 CaCO3/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 CaCO3 from the carpet tile. |
| Author Keywords |
Circular economy; Construction waste; Carpet tile; Reuse; Alkalinity |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000934479800003 |
| WoS Category |
Water Resources |
| Research Area |
Water Resources |
| PDF |
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