Grace Schwartz
Certain types of coal ash, such as fly ash and flue gas desulfurization (FGD) solids, are useful as raw materials in making concrete and dry wall. But a significant fraction of coal ash can be enriched with potentially toxic and bioaccumulative elements such as arsenic, selenium and mercury. The tendency for these elements to leach from ash is one of the key aspects of environmental risk for coal ash disposal.
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