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Project: 804 #G644

Circulating Fluidized Bed Combustion technology is amongst some of the most advanced acid gas emission control technologies. Although the reduction of acid gases is accomplished by this type of combustion, the generation of solid residues has become an area of concern. Much research into FBC technology and FBC wastes has occurred over the last ten years, resulting in improved disposal methods and possible uses for the residues in commercial products.

Some of these previous studies dealt with landfilling CFBC ash and trial emplacement methods which resulted in high compressive strength development and low permeability. However, the duration of this high strength and low permeability has been questioned. The loss of strength and gain in permeability is either a result of the emplacement procedures or a function of the ash, regardless of its manner of emplacement.

This question is addressed in this study through the examination of design test cells constructed using the preliminary procedures and of a landfill site where none, or very few, emplacement procedures were used. The influence of the nature of fuel producing the residues was also examined.

Volume II

This study will address the questions of the characterization of the petroleum coal ashes, as well as whether the absence of the components specific to coal ashes will affect the strength development of the solidified residues.