Emission characteristics and pollution controlling efficiency of Polybrominated Diphenyl Ethers (PBDEs) in exhausted gases from dismantling processes of electronic waste
Abstract：A large number of polybrominated diphenyl ethers (PBDEs) could be emitted from dismantling e-wastes, which might result in potential impacts on the ecological environment and human health. A centralized e-waste dismantled park was selected to quantify emission levels and composition characteristics of PBDEs in the exhaust gases emitted from different purification treatment systems and further evaluate the control effects of each purification treatment system on PBDEs. Concentrations of PBDEs in the heating baking plate and pyrometallurgy dismantling processes were quite different, following the order:the electric furnace phase II (68210 ± 12588)ng/m3>the heating rotary plate furnace (10420±1785)ng/m3>the electric furnace phase I (9960±919)ng/m3> pyrometallurgical furnace (53±14)ng/m3. Meanwhile, there were also certain differences in PBDEs among four purification treatment systems with a concentration descending order of:purification system II (1754±551)ng/m3>purification system I (1630±344)ng/m3> purification system III (1220±51)ng/m3>purification system Ⅳ (9.5±1.1)ng/m3. The composition characteristics of PBDEs in the exhaust gases of the electric heating furnace phase I, electric heating furnace phase II and rolling plate furnace dismantled by heating were similar, with low brominated BDE-99 and BDE-47 as two main components (the sum of their mass fractions was equal to above 60%), the pyrometallurgical waste gas dismantled by high-temperature combustion was dominated by highly brominated BDE-209 (mass fraction of 52%); while the composition characteristics of PBDEs produced in the four purification treatment systems were basically similar, all of which were dominated by low-brominated BDE-28, BDE-47 and BDE-99 (the mass fractions of three monomers were over 50%). The total removal rate of PBDEs by four exhaust gas purification systems ranged from 82.1%~97.4%, demonstrating good pollution control effects on PBDEs generated by different e-waste dismantling processes.
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