低温氧化途径对热焚烧含有全氟辛烷磺酸的材料至关重要

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials letters Pub Date : 2023-12-30 DOI:10.1016/j.hazl.2023.100100
Rodger E. Cornell , Michael P. Burke
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引用次数: 0

摘要

众所周知,全氟烷基和多氟烷基物质(PFAS)对人类健康有害,随着人们销毁这种物质的愿望日益强烈,正确理解碳氟化合物的燃烧化学性质对于在焚烧炉内进行高效热销毁非常重要。虽然大多数碳氟化合物燃烧模型及其中包含的成套反应最初是针对火焰抑制应用中遇到的高温而开发的,但它们经常被用于评估焚化炉中的 PFAS 销毁情况,因为焚化炉强调的是较低的温度范围。我们展示的结果表明,低温碳氟化合物氧化途径--目前还不知道它在碳氟化合物燃烧中的作用--会影响焚化炉的关键性能指标,其中包括PFAS 代用品摩尔分数、不完全销毁产物和废物销毁效率。研究结果进一步表明,氮氧化物是一种潜在的添加剂。本研究结果表明了这些途径对 CF3O2 的影响,目前已有一些相关数据,但对其他氟烷基过氧自由基也会产生类似的途径,而对这些自由基的了解还很少。这些结果表明,今后需要更广泛地确定和描述低温途径,在动力学模型开发中考虑这些途径,并通过实验探测中间温度条件,以更好地理解、设计和控制热破坏技术,从而改善全氟辛烷磺酸的管理。
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Low-temperature oxidation pathways are critical to thermal incineration of PFAS-laden materials

With growing desire to destroy per- and poly-fluoroalkyl substances (PFAS) now known to be detrimental to human health, a sound understanding of fluorocarbon combustion chemistry is important to efficient thermal destruction within incinerators. While most fluorocarbon combustion models and the sets of reactions contained within them were originally developed for the high temperatures encountered in flame suppression applications, they have often been used to assess PFAS destruction in incinerators, which emphasize a lower range of temperatures. We present results that demonstrate that low-temperature fluorocarbon oxidation pathways—not yet known to play a role in fluorocarbon combustion—impact key incinerator performance metrics, including: PFAS surrogate mole fractions, products of incomplete destruction, and waste destruction efficiencies. The results further point to the utility of NO as a potential additive. The present results show the influence of these pathways for CF3O2, for which some data are available, but analogous pathways would also occur for other fluoroalkylperoxy radicals, for which little is known. The results demonstrate the need for future work to identify and characterize low-temperature pathways more generally, consider such pathways in kinetic model development, and experimentally probe intermediate temperature conditions to better understand, design, and control thermal destruction technologies for improved PFAS management.

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来源期刊
Journal of hazardous materials letters
Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering
CiteScore
10.30
自引率
0.00%
发文量
0
审稿时长
20 days
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