Thermal treatment technologywas 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.