Air Pollution Cleaning Wastes: Dry Versus Wet
Publication: Journal of Energy Engineering
Volume 109, Issue 3
Abstract
Wastes from dry air pollution control (APC) systems may not be less problematic to transport and landfill than wastes from wet APC Units, particularly the thixotropic flue gas desulfurization (FGD) sludge. FGD sludge can be converted to a soil‐like, disposable material by forced oxidation, fly ash blending, or lime fixation. Dry APC wastes require dust‐suppression. Dry APC wastes contain 15–23.7 weight percent of and as compared to 3.6 mole % of for wet material. Higher reagent stoichiometries have been reported for dry APC (1.3–1.5), as compared to wet systems (1.05); thus contributing greater dry waste generation rates. For a 1% sulfur, 10% ash, 10,000 Btu/1b coal, 0.14 ton of dry waste is generated per ton of coal. Oxidized FGD sludge yields 0.036 ton waste/ton coal while blended and fixated wastes contribute 0.113 and 0.12 ton of waste per ton of coal, respectively. Dry APC waste exhibited compacted density of 40 lb/CF; wet wastes reflect densities ranging from 80–90 lb/CF (oxidized), 75–90 lb/CF (blended), and 95–105 lb/CF (fixated). Higher waste rates and lower compacted densities require more area for dry APC waste disposal than for wet.
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 109 • Issue 3 • September 1983
Pages: 131 - 141
Copyright
Copyright © 1983 ASCE.
History
Published online: Sep 1, 1983
Published in print: Sep 1983
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