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Treatment of Low Concentrations of Volatile Organic Compounds by Non-thermal Plasma.

机译：非热等离子体处理低浓度的挥发性有机化合物。

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摘要

Non-thermal plasma (NTP) technology is an emerging method to degrade otherwise recalcitrant volatile organic compounds (VOCs) in air. Here, a dielectric barrier discharge (DBD) NTP was used to evaluate the degradation efficiency of several VOCs (toluene, benzene, ethylbenzene, MEK (methyl ethyl ketone), MTBE (methyl-tert-butyl ether) 3-pentanone and n-hexane) under constant experimental conditions (6.6 L/min, 95 and 100 ppm average inlet concentrations). The efficiency with which toluene, ethylbenzene, benzene, MEK, MTBE, 3-pentanone, and n-hexane were removed was 74.03 +/- 0.30%, 80.94 +/- 0.07%, 57.82 +/- 0.06%, 50.00 +/- 0.20%, 80.00 +/- 1.40%, 76.00 +/- 1.4%, and 90.00 +/- 0.30 %, respectively, at an inlet concentration 95 ppm, gas flow rate 6.6 L/min, and a specific input energy (SIE) of 350 J/L. The effects of various operating conditions on pollutant removal were investigated. Interestingly, the highest removal efficiencies were observed for compounds that have the highest percentage of hydrogen in the molecular structure.;During treatment of toluene and ethylbenzene, a deposit was formed inside the plasma reactor. This deposit was dark brown in color and gave off an oil-like odor, suggesting the formation of higher-order hydrocarbon compounds. The deposit mass was quantified and the impact of the deposit on the DBD reactor performance was discussed. It was noted that the time required for the deposit to clog the reactor depended on the experimental conditions. The clogging time when treating toluene in dry air conditions was more than 1.5 times greater than under humidified conditions (30% RH), suggesting that attention to the treated air relative humidity is critical. The quantity and structure of the deposits depended on both input VOC molecular structure as well as the experimental conditions. Thus, this study provides recommendations for the current applications of this technology.
机译：非热等离子体（NTP）技术是一种新兴的方法，可以降解空气中否则难分解的挥发性有机化合物（VOC）。在这里，使用介电势垒放电（DBD）NTP来评估几种VOC（甲苯，苯，乙苯，MEK（甲基乙基酮），MTBE（甲基叔丁基醚）3-戊酮和正己烷）的降解效率）在恒定的实验条件下（6.6升/分钟，平均入口浓度为95和100 ppm）。去除甲苯，乙苯，苯，MEK，MTBE，3-戊酮和正己烷的效率为74.03 +/- 0.30％，80.94 +/- 0.07％，57.82 +/- 0.06％，50.00 +/-在入口浓度95 ppm，气体流速6.6 L / min和特定输入能量（SIE）的情况下，分别为0.20％，80.00 +/- 1.40％，76.00 +/- 1.4％和90.00 +/- 0.30％ 350 J / L。研究了各种操作条件对污染物去除的影响。有趣的是，观察到分子结构中氢百分比最高的化合物的去除效率最高。在处理甲苯和乙苯期间，在等离子体反应器内部形成了沉积物。该沉积物为深棕色，并散发出油状气味，表明形成了更高阶的烃化合物。定量沉积物质量，并讨论了沉积物对DBD反应器性能的影响。注意到沉积物阻塞反应器所需的时间取决于实验条件。在干燥空气条件下处理甲苯时的堵塞时间是在潮湿条件下（30％RH）下的堵塞时间的1.5倍以上，这表明关注处理后的空气相对湿度至关重要。沉积物的数量和结构取决于输入的VOC分子结构以及实验条件。因此，本研究为该技术的当前应用提供了建议。

著录项

  • 作者

    Karatum, Osman.;

  • 作者单位

    Duke University.;

  • 授予单位 Duke University.;
  • 学科 Engineering Environmental.
  • 学位 M.S.
  • 年度 2012
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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