Conception of a novel spray tower plasma-reactor in a spatial post-discharge configuration: Pollutants remote treatment.
This paper describes a novel gliding Arc discharge reactor producing a non-thermal plasma at atmospheric pressure in humid air. The ionized gas is generated in a spray-tower absorber for the treatment of organic pollutants. The reactor configuration enables the plasma-degradation of micro-droplets effluents in the spatial post-discharge mode. This type of design allows to exclude the direct contact between the plasma plume and the liquid to be treated in order to avoid the liquid heating and the flame extinction problems. A hydrodynamic study coupling 'Navier-Stokes' equations and those of 'Convection-Diffusion' allowed to calculate the concentration profiles and the droplet falling velocity. The stripping of phenol was studied to valid the hydrodynamic approach. Experiences and simulations showed that after 1h of treatment, only 5% of the compound was transferred into the plasma phase. The spatiality of the novel reactor allowed a degradation rate of 100% for catechol after 38min of plasma-treatment. For 4-nitrophenol, the degradation rate reached 90% after 120min. Phenol and its by-products degradation were totally degraded by combining the spatiality of the reactor and the temporal post-discharge. A degradation mechanism was proposed and a plasmachemical reaction in relation with the pernitrous acid species was confirmed.
Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation. Faculté des Sciences et de la Technologie, Université de Mostaganem, Algeria.
Mohamed Fouad
MF
Ferhat
Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation. Faculté des Sciences et de la Technologie, Université de Mostaganem, Algeria. Electronic address: m.ghezzar@univ-mosta.dz.
Mouffok Redouane
MR
Ghezzar
Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation. Faculté des Sciences et de la Technologie, Université de Mostaganem, Algeria.
Bentaïba
B
Smaïl
Institut de Recherche de Chimie Paris (IRCP), Equipe 2PM (Procédés, Plasmas, Microsystèmes), UMR 8247, Chimie ParisTech-CNRS, 11 Rue Pierre et Marie Curie, 75005 Paris, France.
Cedric
C
Guyon
Institut de Recherche de Chimie Paris (IRCP), Equipe 2PM (Procédés, Plasmas, Microsystèmes), UMR 8247, Chimie ParisTech-CNRS, 11 Rue Pierre et Marie Curie, 75005 Paris, France.
Stéphanie
S
Ognier
Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation. Faculté des Sciences et de la Technologie, Université de Mostaganem, Algeria.
Ahmed
A
Addou
GAD-spray tower; Hydrodynamics; Mass transfer; Mechanism; Phenolic compounds; Remote treatment