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Issue Eur. Phys. J. Appl. Phys.
Volume 47, Number 2, August 2009
11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)
Article Number 22818
Number of page(s) 7
Section 11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)
DOI 10.1051/epjap/2009110
Published online 05 June 2009

Eur. Phys. J. Appl. Phys. 47, 22818 (2009)
DOI: 10.1051/epjap/2009110

Pulsed electrical discharges in water for removal of organic pollutants: a comparative study

T.H. Dang, A. Denat, O. Lesaint and G. Teissedre

Grenoble Electrical Engineering Laboratory (G2E lab), CNRS and Grenoble University, 25 rue des Martyrs, BP 166, 38042 Grenoble, France

andre.denat@grenoble.cnrs.fr

Received: 12 January 2009 / Accepted: 11 May 2009 / Published online: 5 June 2009

Abstract
In this study, the efficiency of different types of pulsed electrical discharges for the removal of organic pollutants from wastewater has been determined. Three discharge types, either in the water volume or in close proximity to the water surface are studied. The production of hydrogen peroxide in pure water, and the degradation of two typical pollutants (4-chlorophenol and 4-nitrophenol) is measured together with the amount of electrical energy dissipated in discharges. It is shown that the energy yield for the degradation of organic pollutants, expressed in terms of degraded moles per Joule, strongly depends on the discharge type. The highest efficiency is obtained with pulsed corona discharges in humid air above the water surface. A lower efficiency is found with spark discharges in water, and the less efficient process is constituted by streamer discharges in water. The influence of ferrous ions added to solutions is also very different according to the discharge type. This helps to get a better understanding of the degradation processes involved with the different discharge types.

PACS
52.80.-s - Electric discharges.
82.33.-Xj - Plasma reactions.
92.40.-kc - Ground water quality.

© EDP Sciences 2009


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