College of Environment and Energy, South China University of Technology, Guangzhou, 510640, People's Republic of China.
Environ Sci Pollut Res Int. 2014 Mar;21(6):4614-23. doi: 10.1007/s11356-013-2402-6. Epub 2013 Dec 15.
The particle size distributions and leaching characteristics of polybrominated diphenyl ethers (PBDEs) in the bottom ashes of two Taiwanese municipal solid waste incinerators (MSWIs A and B) were investigated to evaluate PBDE leaching into the environment through reutilization of bottom ashes. The PBDE contents in the bottom ashes of the MSWIs (29.0-243 ng/g) could be two orders higher than those in rural and urban soils. The PBDE fraction of the bottom ashes was more distributed in larger particles (> 0.25 mm). Similar trends were found for the PBDE contents in the bottom ashes and their PBDE leaching concentrations, revealing that the elevated PBDE contents in the bottom ashes may lead to a higher PBDE leaching mass. The leaching of PBDEs is attributed to diffusion driven by the concentration gradient and effective surface area. The normalized leaching ratios (NLRs) of PBDEs for the bottom ashes of the MSWIs are about four orders greater than those of PBDE-related raw materials and products, and this may be due to their porous structures having much greater effective surface area. The elevated NLRs of PBDEs thus deserve more attention when bottom ashes are recycled and reutilized as construction materials.
研究了台湾两座城市固体废物焚烧炉（MSWI A 和 B）底灰中多溴二苯醚（PBDEs）的粒径分布和浸出特性，以评估通过再利用底灰将 PBDE 浸出到环境中。MSWI 底灰中的 PBDE 含量（29.0-243ng/g）可能比农村和城市土壤中的含量高两个数量级。底灰中 PBDE 部分更多地分布在较大的颗粒中（>0.25mm）。底灰中 PBDE 含量及其 PBDE 浸出浓度的相似趋势表明，底灰中 PBDE 含量的升高可能导致更高的 PBDE 浸出质量。PBDE 的浸出归因于浓度梯度和有效表面积驱动的扩散。MSWI 底灰中 PBDE 的归一化浸出比（NLR）比 PBDE 相关原料和产品的 NLR 高约四个数量级，这可能是由于其多孔结构具有更大的有效表面积。因此，当底灰作为建筑材料回收和再利用时，应更加关注 PBDE 的 NLR 升高问题。
