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Treatment of air polluted with methanol vapours in biofilters with and without percolation

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Abstract:

Air polluted with methanol vapours was treated in a biofilter and a biotrickling filter, both packed with inert materials. The effects of the nitrogen concentration present in the nutrient solution, the empty bed residence time, and the methanol inlet load, on the biofilter and biotrickling filter performance were all examined and compared. The elimination capacity, the biomass and the carbon dioxide production rates all increased with the increase of the parameters tested. The maximum elimination capacity for the biotrickling filter was 240 g·m-3·h-1 with corresponding removal efficiency of 75% and carbon dioxide production rate of 10 g·m-3·h-1, whereas the maximum elimination capacity for the biofilter was 80 g·m-3·h-1 with corresponding removal efficiency of 35% and carbon dioxide production rate of 70 g·m-3·h-1. The biomass production rate was similar for both the biofilter and the biotrickling filter. The carbon dioxide production rate was higher by a factor of 2 to 9 for the biofilter compared to the biotrickling filter.

De l’air pollué par des vapeurs de méthanol a été traité dans un biofiltre et un biofiltre percolateur garnis avec deux matériaux inertes. Les effets de la concentration d’azote présente dans la solution nutritive, du temps de résidence en fût vide et de la charge de méthanol à l’entrée sur la performance du biofiltre et du biofiltre percolateur ont été analysés et comparés. La capacité d’élimination et les taux de production de biomasse et dioxyde de carbone ont augmenté avec l’augmentation des niveaux des paramètres testés. La capacité d’élimination maximale du biofiltre percolateur était de 240 g·m-3·h-1 correspondant à une conversion à 75 % et un taux de production de dioxyde de carbone de 10 g·m-3·h-1. La capacité d’élimination maximale du biofiltre était de 80 g·m-3·h-1 correspondant à une conversion de 35 %, et un taux de production de dioxyde de carbone de 70 g·m-3·h-1. Le taux de production de biomasse était similaire pour les deux biofiltres. Le taux de production de dioxyde de carbone était de 2 à 9 fois plus élevé pour le biofiltre par rapport à celui du biofiltre percolateur.

Document Type: Research Article

Publication date: 2009-12-01

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  • Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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