کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4429748 | 1619831 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Polychlorinated dibenzo(p)dioxin and furan (PCDD/F) congener profiles in cement kiln emissions and impacts Polychlorinated dibenzo(p)dioxin and furan (PCDD/F) congener profiles in cement kiln emissions and impacts](/preview/png/4429748.png)
Cement kilns are known to emit polychlorinated dibenzo(p)dioxins and furans (PCDD/Fs; “dioxins”), but estimates of the amounts and patterns of these emissions vary widely. These variations may stem from a combination of factors, including the design and operating conditions of the kiln, and the fuels and raw materials fed into the kiln. The goal of this study was to examine the patterns of dioxin emissions in a large set of stack-tests at two Portland cement kilns in Portugal that use a variety of fuels. A total of 152 stack-tests provided data on PCDD/F congener concentrations during which the kilns combusted a varied mix of fuels, including petroleum coke, coal, various “special” supplemental fuels, and refinery distillation ends, which are classified as hazardous wastes. The use of coal to fuel the kilns was found to generate significantly different emission-profiles relative to the use of petroleum coke, but the addition of hazardous wastes as a supplemental fuel did not significantly alter profiles. All of the kiln emission profiles were found to differ markedly from profiles in ambient air. However, the small absolute dioxin emission rates from the kilns suggested that kiln impacts would not be detectable via ambient air monitoring, even in rural settings.
► Profiles of “dioxin” congeners emitted from two Portland cement kilns were examined.
► Congener profiles showed wide variability under nominally similar conditions.
► Use of waste-derived fuels had little effect on the congener profiles.
► The kilns' congener profiles were different from profiles measured in ambient air.
► The kilns' ambient impacts were found to be too small to be observable relative to background.
Journal: Science of The Total Environment - Volume 419, 1 March 2012, Pages 37–43