Field Investigation of a Flue Gas Desulfurization (FGD) Sludge Disposal Site

摘要

An approximately eight-year-old flue gas desulfurization (FGD) sludge disposal site (100 acres in size) was selected for field measurements carried out in 1986. Field and laboratory methods were developed to preserve the chemical integrity of the samples and to accurately measure pH and redox potentials. A combination of field measurements and laboratory experiments with core samples of sludge and of soils underlying the sludge were used to identify geochemical reactions control¬ling elemental concentrations in the sludge pore water and solute migration.nPore waters in the sludge were found to be uniform both spatially and with depth 1n the sludge basin. The pore waters were highly reducing, containing sulfide at parts per million levels.