Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582809 | Journal of Hazardous Materials | 2008 | 8 Pages |
Abstract
Thermal treatment technology was used to remove polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from heavily contaminated soil. For a soil with an original PCDD/F content of 35,970 ng International Toxic Equivalents (I-TEQ)/kg, >99.99% PCDD/F removal efficiency was obtained with a primary furnace at two different treatment temperatures (750 °C and 850 °C), while a secondary furnace at 1200 °C gave >98% decomposition efficiency. The total PCDD/F I-TEQ contents in treated soils at 750 °C and 850 °C were 1.56 ng I-TEQ/kg and 2.15 ng I-TEQ/kg, respectively, which were far below the soil pollution standard of Taiwan (1000 ng I-TEQ/kg soil). Although air pollution control devices had significant effects on the removal of PCDD/Fs, the total I-TEQ concentrations in the upstream flue gas of PUF cartridge at 750 °C and 850 °C (2.61 ng I-TEQ/Nm3 and 2.38 ng I-TEQ/Nm3, respectively) were still higher than the stationary emission limit of the Taiwan EPA (0.5 ng I-TEQ/Nm3). The above results also suggested that additional APCDs, such as activated carbon injection in front of the filter are needed to enhance PCDD/F removal efficiency.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Wen-Jhy Lee, Shun-I Shih, Chih-Yuan Chang, Yi-Chieh Lai, Lin-Chi Wang, Guo-Ping Chang-Chien,