Chang Moo Been, Cheng Yao Chiang, Chi Kai Hsien
Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan.
Sci Total Environ. 2006 Aug 1;366(2-3):456-65. doi: 10.1016/j.scitotenv.2005.04.047. Epub 2006 Jun 30.
The results obtained in this study indicate that addition of sulfur in incineration processes could effectively reduce PCDD/F formation. PCDD/F formation is reduced dramatically (54.1%) when S/Cl molar ratio is controlled at about 2 in a laboratory-scale system (LSS). The XRD analysis of the fly ash confirms the existence of vulcanized metals such as Cu2SO4, Cu2S, SnS and ZnS. The results suggest that the sulfur added would poison Cu-based metals and render the Deacon reaction catalyst less active, thereby reducing PCDD/F formation. In addition, the results obtained from the tests conducted in an industrial waste incinerator (IWI) indicate that the efficiency of reducing PCDD/F formation by adding sulfur was 51.6% at S/Cl mole ratio of 0.4. The results indicate that adding too much sulfur would actually increase particle concentration and also increase PCDD/F yield. This study demonstrates the effectiveness of adding sulfur as an alternative technology for reducing PCDD/F emissions from waste incineration processes. The efficiency of reducing PCDD/F formation by addition of sulfur is strongly influenced by S/Cl mole ratio.
本研究所得结果表明，在焚烧过程中添加硫可有效减少多氯二苯并对二噁英/多氯二苯并呋喃（PCDD/F）的生成。在实验室规模系统（LSS）中，当硫/氯摩尔比控制在约2时，PCDD/F的生成量大幅降低（54.1%）。飞灰的X射线衍射（XRD）分析证实了硫化金属如Cu2SO4、Cu2S、SnS和ZnS的存在。结果表明，添加的硫会使铜基金属中毒，降低迪肯反应催化剂的活性，从而减少PCDD/F的生成。此外，在工业垃圾焚烧炉（IWI）中进行的测试结果表明，在硫/氯摩尔比为0.4时，添加硫减少PCDD/F生成的效率为51.6%。结果表明，添加过多的硫实际上会增加颗粒浓度，也会增加PCDD/F的产量。本研究证明了添加硫作为减少垃圾焚烧过程中PCDD/F排放的替代技术的有效性。添加硫减少PCDD/F生成的效率受硫/氯摩尔比的强烈影响。
