Table 6.
Detoxifcation results of PCDD/Fs in low-temperature thermal treatment.
| Temperature ( ℃) | Atmosphere | Time | PCDD/Fs content of original fly ash (I-TEQ) | PCDD/Fs content after detoxification (I-TEQ) | DE (%) | References |
|---|---|---|---|---|---|---|
| 350 | Anoxia | 1 h | 0.6 ng/g | 0.002 ng/g | 99.7 | 12 |
| 340 | Nitrogen | 6 h | 325 ng/g | 6.825 ng/g | 97.9 | 13 |
| 450 | Low oxygen | 1 h | 3.2 g/kg | Less than 0.05 μg/kg | Higher than 98.5 | 14 |
| 400 | Nitrogen | 45 min | 8.980 ng/g | 0.0104 ng/g | 99.9 | 15 |
| 500 | Air | 30 min | 4.3 g/kg | 0.3 μg/kg | 93.1 | 16 |
| 300 | Nitrogen | 30 min | 24.1 ng/kg | 4.82 ng/kg | 80 | 17 |
| 350 | Nitrogen | 1 h | 0.44 ng/g | 0.098 ng/g | 77.8 | 18 |
| 350 | Nitrogen | 15 min | 1575.2 pg/g | 594.7 pg/g | 62.2 | 19 |