Geotechnical Properties of FGD Scrubber Material

摘要

Depending on the process used,flue gas desulfurization(FGD)product results when sulfur dioxide(SO2)is removed from coal combustion flue gas.SO2 may be reacted with an alkaline material,forming calcium sulfite or calcium sulfate.Calcium sulfite is formed in inhibited oxidation FGD systems.This calcium sulfite residual,referred to here as FGD scrubber material,may be partially dewatered and mixed with stabilization additives prior to sluicing as a slurry to an impoundment for storage.When an impoundment is closed,a soil cover is generally needed to limit infiltration and support vegetation.Construction over the soft FGD materials is challenging.Geotechnical characterization of the FGD scrubber material is necessary to support design and construction planning for cover and closure of an impoundment.This paper presents results from standard geotechnical and hydraulic tests,performed on samples of an FGD material from a coal burning power plant.We also consider the application of these parameters in planning construction of a soil cover over a deposit of the tested FGD material.