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Optical Emission Spectroscopy in Cooking Exhaust from a Wet Scrubber/Atmospheric Plasma Reactor

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Volume: 14 | Issue: 6 | Pages: 1665-1674
DOI: 10.4209/aaqr.2014.01.0002
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Hsiao-Hsuan Mi1, Wei-Tung Liao2, Hung-Chang Chang3, Shui-Jen Chen3, Chih-Chung Lin3, Lien-Te Hsieh 3,4

  • 1 Department of Environmental Engineering & Science, Chia Nan University of Pharmacy and Science, Tainan City 71743, Taiwan
  • 2 Department of Chemical and Materials Engineering, Southern Taiwan University of Science and Technology, No. 1, Nan-Tai Street, Yungkang Dist., Tainan 71005, Taiwan
  • 3 Department of Environmental Engineering and Science, National Pingtung University of Science and Technology, No. 1, Shuefu Road, Neipu, Pingtung 91201, Taiwan
  • 4 Emerging Compounds Research Center (ECOREC) , National Pingtung University of Science and Technology, No. 1, Shuefu Road, Neipu, Pingtung 91201, Taiwan

Highlights

To understand the changes of optical emissions spectra (OES) in a gaseous phase from cooking fumes.
The experimental results showed that active species C, C2, CH, N, Hγ, N2, N2+, NO, C+, NH, O2+, H2, and O can be tested.
When cooking fumes are treated with WSB/PR, light emission intensity intensifies with increased plasma power.
The number of active species is reduced when plasma power is increased.


Abstract

This study introduced a self-developed wet scrubber/plasma reactor (WSB/PR) system to treat cooking fumes, and measured the changes in the optical emissions spectra (OES), before and after treatment using OES, in order to understand the changes of OES in a gaseous phase from waste gas. In terms of operational parameters of the experiment, the scrubbing solution used in WSB was tap water and an enzyme scrubbing solution, and atmospheric pressure plasma was applied inside PR. Furthermore, five different output powers (0.112 kJ/m3, 0.129 kJ/m3, 0.138 kJ/m3, 0.146 kJ/m3, and 0.156 kJ/m3) were utilized to conduct experiments. The experimental results showed that, through the operations of five different plasma output powers, active species C, C2, CH, N, Hγ, N2, N2+, NO, C+, NH, O2+, H2, and O can be tested under the following three situations: (i) start PR (plasma background value) without importing cooking fumes; (ii) cooking fumes pass through WSB/PR; and (iii) cooking fumes pass through ESB/PR. When cooking fumes are treated with WSB/PR, light emission intensity intensifies with increased plasma power, from 0.112 kJ/m3 to 0.146 kJ/m3. The same tendency occurs in the situation of cooking fumes treated with ESB/PR, which increases plasma power from 0.112 kJ/m3 to 0.138 kJ/m3. In addition, the number of active species is reduced when plasma power is increased. This indicates that, electron energy is reduced due to the H2O decomposition function in the plasma reaction, which results in a decrease in the number of active species.

Keywords

Plasma Cooking fumes OES (optical emission spectra) Active species Free radicals


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