. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1965 1970 1975 1980 1985 Figure 8 Sulfur in coal consumed in Illinois. 1990. 1965 70 75 80 85 1990 Figure 9 Ash in coal consumed in Illinois. the 1980s indicates that it is not easy to remain economi- cally competitive. Another environmentally significant trend with eco- nomic consequences is the amount of waste generated by electric power plants. Currently, only four major Illi- nois power plants h
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1965 1970 1975 1980 1985 Figure 8 Sulfur in coal consumed in Illinois. 1990. 1965 70 75 80 85 1990 Figure 9 Ash in coal consumed in Illinois. the 1980s indicates that it is not easy to remain economi- cally competitive. Another environmentally significant trend with eco- nomic consequences is the amount of waste generated by electric power plants. Currently, only four major Illi- nois power plants have scrubbers, producing only small quantities of gypsum wastes; however, generation of gypsum or a similar product could substantially increase in the decades to come. Methods must be found to util- ize and/or dispose of these wastes, unless technologies such as the Integrated Gasification Combined Cycle (IGCC) become widely applicable. Similarly, electrostatic precipitators generate large quan- tities of fine ash that can be, and often are, used in cement production and other construction-related appli- cations. The generation of bottom ash depends primarily on the amount of "ash" or noncombustible material in coal. Data on ash content, like data on sulfur content, have only been available since 1973. The average ash content of coal consumed in Illinois' electric utilities has declined from about by weight in 1973 to about in 1991 (fig. 9). Based on coal tonnage and the average ash content, it is estimated that bottom ash generation in Illinois has declined by about 33%, from million tons in 1973 to million tons in 1991. This trend is likely to continue as more sophisti- cated coal cleaning technologies are used, reducing the ash content of coal. Illinois is already at the forefront in the nation in terms of the percentage of coal being sub- jected to physical coal cleaning. More than 95% of Illi- nois coal is physically cleaned before sale, as co
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