Leslie F. Ruppert
Sharon M. Swanson
Kevin B. Jones
2012
<p><span>To assess how elements leach from several types of <a title="Learn more about Coal Combustion" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/coal-combustion" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/coal-combustion">coal combustion</a> products (CCPs) and to better understand possible risks from CCP use or disposal, <a title="Learn more about Coal" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/coal" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/coal">coal</a> ashes were sampled from two bituminous-coal-fired power plants. One plant located in Ohio burns high-sulfur (about 3.9%) Upper <a title="Learn more about Pennsylvanian" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/pennsylvanian" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/pennsylvanian">Pennsylvanian</a> Pittsburgh coal from the Monongahela Group of the Central Appalachian Basin; the other in New Mexico burns low-sulfur (about 0.76%) <a title="Learn more about Upper Cretaceous" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/upper-cretaceous" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/upper-cretaceous">Upper Cretaceous</a> Fruitland Formation coal from the San Juan Basin, Colorado Plateau. The sampled CCPs from the Ohio plant were <a title="Learn more about bottom ash" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/bottom-ash" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/bottom-ash">bottom ash</a> (BA), economizer </span><a title="Learn more about fly ash" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/fly-ash" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/fly-ash">fly ash</a><span> (EFA), and fly ash (FA); the sampled CCPs from the New Mexico plant were BA, mixed FA/EFA, FA, and cyclone-separated coarse and fine fractions of a FA/EFA and FA blend. Subsamples of each ash were leached using the long-term leaching (60-day duration) component of the synthetic groundwater leaching procedure (SGLP) or the toxicity characteristic leaching procedure (TCLP, 18-hour duration). These ashes were all alkaline. <a title="Learn more about leachate" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/leachate" data-mce-href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/leachate">Leachate</a> concentrations and leachabilities of the elements from the CCPs were similar between corresponding CCP types (BA, EFA, and FA) from each plant. The leachabilities of most elements were lowest in BA (least leachable) and increased from EFA to FA (most leachable). Ca and Sr were leached more from EFA than from either BA or FA. Leachability of most elements also increased as FA particle size decreased, possibly due in part to increasing specific surface areas. Several oxyanion-forming elements (As, Mo, Se, U, and V) leached more under SGLP than under TCLP; the opposite was true for most other elements analyzed.</span></p>
application/pdf
10.1016/j.coal.2011.10.007
en
Elsevier
Leaching of elements from bottom ash, economizer fly ash, and fly ash from two coal-fired power plants
article