Prevention of polychlorinated dibenzo-p-dioxins/dibenzofurans formation on municipal waste incinerator fly ash using nitrogen and sulfur compounds
Prevention of polychlorinated dibenzo-p-dioxins/dibenzofurans formation on municipal waste incinerator fly ash using nitrogen and sulfur compounds
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DOI：
10.1021/es9508075
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发表时间：
1996-07-01
影响因子：
11.4
通讯作者：
Olie, K
中科院分区：
文献类型：
--
作者：
Addink, R;Paulus, RHWL;Olie, K
在实验室条件下，通过添加乙二胺四乙酸（EDTA）、次氮基三乙酸（NTA）或硫化钠，可以减少焚烧炉飞灰中多氯二苯并二恶英（PCDD）和多氯二苯并呋喃的形成。使用这些化合物（抑制剂），减少钙的形成。达到80-90%。抑制剂降低了形成的[PCDD]：[PCDF]的比例，表明存在不止一种由碳形成的途径。EDTA和Na 2S降低了多氯二苯并对二恶英的氯化程度;对于多氯二苯并呋喃，Na 2S也有同样的效果。根据这些异构体分布受化学控制的理论，加入抑制剂后，同系物中的异构体分布没有发生变化。在另外的实验中，NTA在30-60分钟的反应时间、300 - 400 ℃的温度和2- 10%的反应混合物浓度下得到良好的还原。以HCl为氯化剂，NTA对PCDD和PCDF的抑制率均大于50%。这些抑制剂显示出有希望的结果，以实现减少多氯二苯并对二恶英/F的形成。使用NTA的额外实验表明，该化合物可以在各种条件下减少形成，使其适用于焚烧炉的后燃烧区，其中反应条件会有所不同。
Formation of polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans on incinerator fly ash can be reduced under laboratory conditions by the addition of ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), or Na2S. With these compounds (inhibitors), a reduction in formation of ca. 80-90% is achieved. The inhibitors reduce the ratio of [PCDD]:[PCDF] formed, suggesting that more than one pathway for the formation from carbon exists. EDTA and Na2S reduce the degree of chlorination of PCDD; for PCDF, the same effect is seen with Na2S. No change was ever seen in the isomer distribution within homologues as a result of the inhibitors added, in accordance with the theory that these isomer distributions are thermodynamically controlled. In additional experiments, NTA gave a good reduction with reaction times of 30-60 min, at temperatures between 300 and 400 degrees C, and with concentrations in the reaction mixture of 2-10%. With HCl as a chlorinating agent, the inhibition by NTA is >50% for both PCDD and PCDF. These inhibitors show promising results to achieve the reduction of PCDD/F formation. The additional experiments with NTA show that this compound can reduce formation under various conditions, making it suitable for use in the post-combustion zone of an incinerator, where reaction conditions will vary.