. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 19a0 1981 1982 1983 1984 1985 1986 1987 1988 1988 1990 ââ âFry»sh â°âBoltomi* TodI Figure 18. Ash waste (thousand tons) from Commonwealth Edison fossil fuel plants. 900 \/\ aoo \ TOO \ 000 900 400 "â \ 300 200 '^^â^^ ^^\ 100 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 Figure 17. S02 emissions (thousand tons) from Commonwealth Edison's fossil fuel facilities. Total Ash. Coal combust
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 19a0 1981 1982 1983 1984 1985 1986 1987 1988 1988 1990 ââ âFry»sh â°âBoltomi* TodI Figure 18. Ash waste (thousand tons) from Commonwealth Edison fossil fuel plants. 900 \/\ aoo \ TOO \ 000 900 400 "â \ 300 200 '^^â^^ ^^\ 100 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 Figure 17. S02 emissions (thousand tons) from Commonwealth Edison's fossil fuel facilities. Total Ash. Coal combustion produces ash as a by- product â bottom ash is collected at the bottom of the boiler, and fly ash is collected within the stack by electrostatic precipitators. In 1980, Commonwealth Edison generated 923 thousand tons of ash ( fly ash, bottom ash); this number dropped 6% by 1990 when the company generated 864 thousand tons of ash (49% fly ash, 51% bottom ash). The amount of fly ash generated declined 25% over the 20 years while bottom ash increased (Figure 18). The decrease in fly ash is somewhat due to the switch to low-sulphur coal and an overall reduction in coal usage. Ash is either buried in landfills dedicated to ash disposal or used in other products, such as highway and building consffuction concrete; roofing; road de- icer; granule, sewer and drainage line backfill materials; and as foundation material for grading building sites and road rights-of-way. In 1991, approximately 33% of the total ash was landfilled. (Commonweath Edison, 1992). Nuclear Power. Commonwealth Edison is the largest producer of nuclear power in the United States, operating six nuclear generating facilities (ICC, 1989). Nuclear power production in 1979 was approximately 25 million kWh; in 1989 it was approximately 69 million kWh (Figure 19).. Figure 19. Commonwealth Edison nuclear power generation (million kWh). Prior to 1987, before Illinois Power's Clinton Nuclear P
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