Characterizing the emission of chlorinated/brominated dibenzo-p-dioxins and furans from low-temperature thermal processing of waste printed circuit board
2012
Duan, Huabo | Li, Jinhui | Liu, Yicheng | Yamazaki, Norimasa | Jiang, Wei
This study focuses primarily on the inventory of PCDD/Fs and PBDD/Fs associated with the low-temperature thermal processing of scrap printed circuit boards (PCBs). Twelve 2,3,7,8-substituted PBDD/Fs congeners were found in various sample outputs, with a total content of 60,000ng TEQ/kg at 250°C under air atmosphere. A rapid increase of PBDD/Fs was produced with 160,000ng TEQ/kg, at 275°C—about twice that under the N₂ atmosphere. At 275°C, the total contents of PCDD/Fs were only 170 and 770ng TEQ/kg under an N₂ and air atmospheres respectively. The results reveal that a large contribution of PBDD/Fs emission may be expected from the dismantling or any other thermal processing of PCB scrap. PCDD/Fs, however, are formed and released into the environment in a variety of ways. Additional research is required to look for the causal factors that affect emissions.
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