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3. Plasma and catalyst
The presence of ozone and nitrogen oxides in the effluent leaving non-thermal plasma air treatment systems is the biggest drawback of this technology, which will require post-treatment to eliminate these toxic by-products, particularly ozone, whose output concentration can exceed 100 ppm(v) (i.e. 0.2 g/m 3 ). For the record, French labor regulations require a concentration of less than 0.2 ppm(v) for short-term exposure (STEL) and 0.1 ppm(v) for 8-hour exposure (TWA), while Europe recommends a limit value of less than 0.055 ppm(v).
In practice, ozone decomposes very rapidly at room temperature on a solid catalyst, which may be based on activated carbon, zeolite or manganese oxide (MnO 2 ). The presence of ozone is the major drawback of systems using non-thermal plasma to treat...
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Bibliography
- (1) - FANLO (J.L.), CARRE (J.) - Pollution olfactive, sources d'odeurs, cadre réglementaire. Techniques de mesure et procédés de traitement - Étude Record n° 03-0808//0809/1A, http://www.record-net.org (Mars 2006).
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Other works
For further information, readers may wish to consult the following book:
Non-equilibrium air plasmas at atmospheric pressure, Edited by : BECKER (K.H.), KOGELSCHATZ (U.), SCHOENBACH (K.H.) and BARKER (R.J.) in Series in Plasma Physics, Institute of Physics, published by ROUTLEDGE c/o Taylor & Francis Group, Bristol UK-New York USA (2004) ISBN 978-0-7503-0962-2.
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Research Group on the Energetics of Ionized Environments (GREMI)
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University of Orléans, Polytech'Orléans
Website : http://www.univ-orleans.fr/gremi
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