Polychlorinated dibenzo-p-dioxins and dibenzofurans in flue gas emissions from municipal solid waste incinerators in China

Polychlorinated dibenzo-p-dioxins and furans （PCDD/Fs） emissions in flue gas from two types of municipal solid waste incinerators （MSWIs） most commonly used in China were investigated in this study. The selected incinerators include two grate-type MSWIs： MSWI-A （350 t/d） and MSWI-B 050 t/d）, and two fluidized bed MSWIs： MSWI-C （400 t/d） and MSWI-D （400 t/d）, which are all equipped with semi-dry lime scrubber and bag filter except MSWI-D equipped with cyclone and wet scrubber （WS） as air pollutant control device （APCD）. Results indicated that the emission concentration and the international toxic equivalents （I-TEQs） of the PCDD/Fs from the stacks were in the range of 1.210-10.273 ng/Nm^3 and 0.019-0.201 ng I-TEQ/Nm^3, respectively. They were greatly lower than the emission regulation standard of PCDD/Fs in China （1.0 ng I-TEQ/Nm^3）. However, only the PCDD/Fs emission level from MSWI-C was below 0.1 ng I-TEQ/Nm^3. Although the homologue profiles were distinct, the contributions of the 2,3,7,8-subsituted congeners to the total I-TEQ were similar among all the investigated MSWIs. Two major 2,3,7,8-substituted congeners, 2,3,4,7,8-PeCDF and 1,2,3,7,8-PeCDD, account for 47% and 9% （average values） of the total I-TEQ values, respectively. The correlation between PCDD/Fs levels and composition of flue gas was also discussed.

在从市政的稳固的浪费焚烧装置(MSWI ) 的二种类型的烟道气体的排出物最通常在中国使用了的 Polychlorinated dibenzo-p-dioxins 和呋喃(PCDD/Fs ) 在这研究被调查。选择焚烧装置包括二刺激类型 MSWI：MSWI -- A (350 t/d ) 和 MSWI-B (150 t/d ) ，并且二使流体化床 MSWI：除了作为污染空气的物质控制设备(APCD ) 与气旋和湿 scrubber (WS ) 装备的 MSWI-D， MSWI-C (400 t/d ) 它是和 MSWI-D (400 t/d ) 都与半干燥的石灰 scrubber 和袋子过滤器装备了。结果显示排放集中和从栈的 PCDD/Fs 的国际有毒的等价物(I-TEQs ) 分别地在 1.210 ∼10.273 ng/Nm 3 和 0.019 ∼0.201 ng I-TEQ/Nm 3, 的范围。他们是极大地在中国比 PCDD/Fs 的排放规定标准降低(1.0 ng I-TEQ/Nm 3) 。然而，从 MSWI-C 的仅仅 PCDD/Fs 排放水平在 0.1 ng I-TEQ/Nm 3 下面。尽管相当或相同事物侧面是不同的，到全部的 I-TEQ 的 2,3,7,8-subsituted 同种的物的贡献在所有调查 MSWI 之中是类似的。二主要 2,3,7,8 代用品同种的物， 2,3,4,7,8-PeCDF 和 1,2,3,7,8-PeCDD，全部的 I-TEQ 的为 47% 和 9% 的报道(平均价值) 分别地珍视。在 PCDD/Fs 层次和烟道气体的作文之间的关联也被讨论。