School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health , Jinan University , Guangzhou 510632 , China.
Environ Sci Technol. 2018 Apr 17;52(8):4650-4657. doi: 10.1021/acs.est.8b00780. Epub 2018 Apr 6.
Primitive processing of e-waste potentially releases abundant organic contaminants to the environment, but the magnitudes and mechanisms remain to be adequately addressed. We conducted thermal treatment and open burning of typical e-wastes, that is, plastics and printed circuit boards. Emission factors of the sum of 39 polybrominated diphenyl ethers (∑PBDE) were 817-1.60 × 10 ng g in thermal treatment and nondetected-9.14 × 10 ng g, in open burning. Airborne particles (87%) were the main carriers of PBDEs, followed by residual ashes (13%) and gaseous constituents (0.3%), in thermal treatment, while they were 30%, 43% and 27% in open burning. The output-input mass ratios of ∑PBDE were 0.12-3.76 in thermal treatment and 0-0.16 in open burning. All PBDEs were largely affiliated with fine particles, with geometric mean diameters at 0.61-0.83 μm in thermal degradation and 0.57-1.16 μm in open burning from plastic casings, and 0.44-0.56 and nondetected- 0.55 μm, from printed circuit boards. Evaporation and reabsorption may be the main emission mechanisms for lightly brominated BDEs, but heavily brominated BDEs tend to affiliate with particles from heating or combustion. The different size distributions of particulate PBDEs in emission sources and adjacent air implicated a noteworthy redisposition process during atmospheric dispersal.
电子废物的原始处理可能会向环境中释放大量有机污染物，但这些污染物的数量和机制仍有待充分解决。我们对典型的电子废物（即塑料和印刷电路板）进行了热处理和露天焚烧。热处理和露天焚烧中∑多溴二苯醚（∑PBDE）的排放因子分别为 817-1.60×10ng g和未检出-9.14×10ng g。在热处理中，空气颗粒物（87%）是 PBDEs 的主要载体，其次是残余灰分（13%）和气态成分（0.3%），而在露天焚烧中，它们分别占 30%、43%和 27%。∑PBDE 的输出-输入质量比在热处理中为 0.12-3.76，在露天焚烧中为 0-0.16。所有 PBDEs 主要与细颗粒物有关，来自塑料外壳的热降解中几何平均直径为 0.61-0.83μm，露天焚烧中为 0.57-1.16μm，来自印刷电路板的几何平均直径为 0.44-0.56μm 和未检出-0.55μm。蒸发和再吸收可能是低溴化 BDEs 的主要排放机制，但高溴化 BDEs 可能与加热或燃烧过程中的颗粒物有关。排放源和相邻空气中颗粒态 PBDEs 的不同粒径分布表明，在大气扩散过程中存在显著的再分配过程。
