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A Method To Reduce The Particle Pollution In The Air Of Parisian Subway Stations


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S. Tokarek, D. Gabay & A. Bernis


A method to reduce the particle pollution in the air of Parisian subway stations S. Tokarek1, D. Gabay1 & A. Bernis2 1 RATP, France 2 ESIGEC, University of Savoie, France Abstract The particles present in the underground atmosphere are mainly produced by the system of braking and guiding of the trains. They are put in suspension each time that a train is coming and they stay permanently in suspension during peak hours. The present study includes several steps: The characterisation of subway particulate pollution (chemical composition, size and evolution in time) The study of an innovating electrostatic precipitator (Recycl'Air *) with respect to ambient particles. The results show that the filter performance is good and is not altered with time. To treat a station, it will be necessary to settle around thirty separtors. The use of computational fluid mechanics to optimise the position of these electrostatic filters in the station. Introduction The air quality in the Parisian underground is one of the users’ major preoccupations. The particle concentration in stations is one of the biggest problems, notably if it is necessary to satisfy statutory values announced for the future years. The presence of particles is due to the system of braking and guides of the trains, to the roadbed, to the cover and to the users’ textile. To decrease particle content in station, actions can be made in the source (on the systems of braking of trains . . .) or by the use of corrective measures. It is this last way that is envisaged in this study. Previous searches (S. Mazoue [1], [2]) have shown the aptness of the electrostatic precipitation in the underground. The presented work has for objective the study of particle characteristics, a pilot of electrostatic precipitator and the airflow modeling in a station to optimize the filter position.