Abstract
Several regulations on exhaust gases have been introduced to curb hazardous exhaust of volatile organic compounds (VOCs) and particulate matter (PM) from the paint and printing industries. VOCs produce photochemical oxidants and suspended PM such as PM2.5, which is now recognized as a global environmental problem. We assess a nonthermal plasma technique for controlling VOC emissions, especially, propose a wet-type packed-bed plasma reactor to extend the treatment of water-non-soluble VOCs. This paper proposes a wet-type packed-bed plasma reactor to extend the treatment of water-non-soluble VOCs. The proposed technique is evaluated through the simultaneous removal of nanoparticles and toluene at a relatively high flow rate. Simultaneous treatment of the VOCs and nanoparticles using the reactor indicates that the average particle collection efficiency is 94%, and the removal efficiency of 60 ppm toluene is 73% with a gas flow rate of 10 L/min. The resultant byproducts are benzaldehyde (C6H5CHO), benzyl alcohol (C6H5CH2OH), phenol (C6H5OH), ozone, formic acid, and acetic acid, and some are easily dissolved and removed by the sodium hydroxide solution film. A smaller pellet diameter leads to more efficient toluene removal at lower specific energy values, while the ozone concentration does not change. However, the ozone concentration can be greatly suppressed by dissolving the ozone in the alkali solution film.
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Acknowledgements
The authors thank Mr. X. Xi and Mr. M. Ohashi, who are graduate students at Osaka Prefecture University, for performing the experiments.
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The work was supported in part by a research collaboration fund of Samsung Advanced Institute of Technology (SAIT) and JSPS KAKENHI Grant Number JP20H02374 and JP23H01626.
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TS, HY, and MO wrote the main manuscript text, and TS and HY prepared all figures. TK, JK, DK, TY, and MO designed the plasma reactor and the experiment. All authors reviewed the measured data and the manuscript.
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Shimada, T., Yamasaki, H., Kuroki, T. et al. Wet-Type Packed-Bed Nonthermal Plasma for Simultaneous Removal of PM and VOCs. Plasma Chem Plasma Process 44, 239–255 (2024). https://doi.org/10.1007/s11090-023-10403-1
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DOI: https://doi.org/10.1007/s11090-023-10403-1