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Performance and macrokinetic analysis of biofiltration of toluene and p-xylene mixtures in a conventional biofilter packed with inert material |
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| Authors: | Gallastegui G Avalos Ramirez A Elías A Jones J P Heitz M |
| Institution: | a Department of Chemical and Environmental Engineering, Engineering Faculty, University of the Basque Country, Alda Urquijo s/n, 48013 Bilbao, Spain b Department of Chemical Engineering and Biotechnological Engineering, Faculty of Engineering, Université de Sherbrooke, 2500, Boulevard de l’Université, Sherbrooke, QC, Canada J1K 2R1 c Institut de Recherche et de Développement en Agroenvironnement (IRDA), 2700, rue Einstein, Québec, QC, Canada G1P 3W8 |
| Abstract: | Interactions of toluene and p-xylene in air treatment biofilters packed with an inert filter media were studied. The effect of the inlet load of toluene, p-xylene and mixtures of both compounds on the biodegradation rate was analyzed in three lab-scale biofilters. A maximum elimination capacity (EC) of 26.5 and 40.3 g C m−3 h−1 for an inlet load (IL) of 65.6 and 57.8 g C m−3 h−1 was obtained for p-xylene and toluene biofilters, respectively. Inhibition of p-xylene biodegradation by the presence of toluene took place when the mixture was treated, whereas the presence of p-xylene had an enhancing effect on the toluene removal efficiency. Specific growth rates (μ) from 0.019 to 0.068 h−1 were calculated in the mixed biofilter, where the highest values were similar to mixtures with lower p-xylene levels (ILp-Xyl 8.84 ± 0.29 g C m−3 h−1). Michaelis-Menten and Haldane type models were fitted to experimental EC for p-xylene and toluene biofilters, respectively. |
| Keywords: | Biofiltration VOC mixture Macrokinetic Carbon balance Specific growth rate |
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