[Atmospheric emission of PCDD/Fs from modern dry processing cement kilns with preheating in the southwest area, China].
Six cement kilns were measured for emissions of PCDD/Fs in the Southwest Area, China. The results indicated that the emission levels of PCDD/Fs were 0.0029-0.0062 ng-m(-3) (Average, 0.0043 ng X m(-3)) from cement kilns which did not burn solid waste, and 0.028 ng X m(-3) from co-processing sewage sludge in cement kiln. The levels of PCDD/Fs emissions from cement manufacturing in the Southwest Area were significantly below the national emissions standard (0.1 ng x m(-3)). Emission factors of PCDD/Fs from the six cement kilns varied between 0.0089 and 0.084 microg x t(-1) cement, which were near or below the lowest emission factor reported by UNEP in 2005. Moreover, the emission factor of PCDD/Fs from co-processing sewage sludge in cement kiln was 7.6 times of the average factors from the other five cement kilns. Moreover,congener distribution of PCDD/F in stack gas from the two types of cement kilns was very different. The results showed that modern dry process cement kilns with preheating have lower emissions of PCDD/Fs. This suggested that the product of co-processing solid waste in cement kilns should be largely enhanced in China in future.
Xiao-Ling
XL
Zhang
Yi
Y
Lu
Chuan
C
Jian
Zhi-Shun
ZS
Guo
Ming-Ji
MJ
Zhu
Li
L
Deng
Jing
J
Sun
Qin
Q
Zhang
D001572:Benzofurans / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D017745:Incineration; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D011108:Polymers / Q000032:analysis*; D012037:Refuse Disposal / Q000379:methods; D012722:Sewage / Q000737:chemistry*
D001572:Benzofurans; D000072317:Polychlorinated Dibenzodioxins; D011108:Polymers; D012722:Sewage; C016068:polychlorodibenzofuran