Abstract
Coal fly ash (CFA) is a by-product of the cola combustion process in electric power plants that can be used as a soil amendment or building material and as a component in cement. Because of its highly alkaline nature, CFA can be also used to adsorb toxic elements from aqueous solutions including heavy metals and boron. Boron (B) is an element with wide use around the globe. In aqueous solutions, B occurs in the form of boric acid and is an essential nutrient in living organisms; however, in excessive amounts it may become toxic to plants, animals, and humans. This chapter introduces aspects related to CFA and its relation to the element B, such as B content and its forms, the influence of CFA on soil and plant B, and the use of CFA to remove B.
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