Migration of Hazardous Substances through Soil. Part 3. Flue-Gas Desulfurization and Fly-Ash Wastes

摘要

The Flue-Gas Desulfurization (FGD) wastes contained high concentrations of boron and fluoride and moderate amounts of arsenic, chromium, copper, lead, nickel and zinc. The beryllium and cadmium were low and mercury and selenium were very low or not detected. The fly-ash (FA) wastes contain substantial concentrations of boron, chromium, copper, fluoride, lead, nickel, and zinc. The cadmium content was low and beryllium was found in low to moderate concentrations. Mercury was not detected in the FA wastes. Boron and fluoride were found in high concentrations on the FGD supernatant liquor. Except for lead which was present in low concentrations, the other elements of interest were found in very low concentrations or were not detected. Other elements, such as calcium, potassium, and sodium were found in very high concentrations in the supernatant liquor. The magnesium concentration was low (compared to the other alkaline metals and earths) in most of the FGD waste samples. It was concluded that these non-toxic elements would no doubt affect the removal of the elements of interest from the waste leachate as it passed through soils. Keywords: Flue gas, Desulfurization, Fly ash, Wastes, Toxics, Metals, Hazardous materials, Cadmium, Chromium, Cooper, Mercury, Lead, Zinc.