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Show AFRC90 Paper #7 SIZE DISTRIBUTIONS OF TRACE METALS IN FLUE GAS PARTICULATE FROM A PILOT-SCALE ROTARY KILN INCINERATOR Donald J. Fournier, Jr. and Larry R. Waterland, Ph.D. )/{cJ- 7~'1 Acurex corporation u.s. EPA Incineration Research Facility Jefferson, Arkansas and Gregory J. Carroll u.s. Environmental Protection Agency Risk Reduction Engineering Laboratory Cincinnati, Ohio ABSTRACT ~~ ~l ~~~/ ~ I- ~ ~ f The distributions of nine trace metals in flue gas particulate by particle size range were determined as part of a pilot-scale hazardous waste incineration test program. These tests were conducted in the rotary kiln incinerator system at the Environmental Protection Agency's (EPA's) Incineration Research Facility (IRF) in Jefferson, Arkansas. The metals tested were arsenic, barium, bismuth, cadmium, chromium, copper, lead, magnesium and strontium. They were fed to the kiln as part of a synthetic hazardous waste feed representing a solid material containing both organic and metal contaminants. The variables for the seven tests addressed in this paper were kiln exit temperature (816° to 927°C (1500° to 1700°F» and waste feed chlorine content (0 to 8 percent). A flue gas sampling train located at the afterburner exit collected approximately 1 g of particulate during each test. Each sample was size fractionated, yielding ranges of nominally less than 2 ~m, 2 to 4 ~m, 4 to 10 ~m, 10 to 30 ~m, and greater than 30 ~m. The fractionated samples were analyzed for each of the metals to determine the distribution of the metals in the particulate size ranges. Increasing kiln temperature from 816° to 927°C (1500° to 1700°F) caused the average distributions to shift from roughly 20 percent less than 10 ~m to an average of 60 percent less than 10 ~m for all test metals except chromium. In addition, individual metal enrichment in finer particulate correlated with relative metal volatilities, with the volatile metals becoming more enriched in the finer particulate fractions. For cadmium, copper, and lead, an increase in waste feed chlorine content from 0 to 4 percent caused their distributions to shift from roughly 20 percent less than 10 ~m to 55 percent less than 10 ~m. No further effects with feed chlorine increased to 8 percent were observed for these metals. For chromium, increasing chlorine content from 0 to 4 1 |
