Biofiltration des vapeurs de bitume--aspects opérationnels
|Advisor:||Lessard, Paul; Buelna, Gérardo Ramon|
|Abstract:||This study was carried out in response to odour problems around a polymer-modified bitumen mixing and storage plant. Biofiltration of these bitumen vapours presents an interesting challenge since they combine odorous substances with volatile organic compounds (VOCs). The general objective of this study was to determine the potential of biofiltration for the treatment of air containing bitumen vapours. By means of a detailed analysis of the bitumen vapours, it was possible to identify over a 100 compounds. This analysis was then used to create a synthetic gas which was representative of the bitumen vapours: H2S and five VOCs (hexane, decane, toluene, p-xylene and thiophene). Two pilot-scale biofilters were operated using this synthetic gas for a period of 106 days. Biofilter 1 was a single-stage system while biofilter 2 was a two-stage system. The biofilters, 25 cm in diameter, were filled with 1 and 2 m of an organic filter medium to obtain empty bed residence times of 36 and 72 seconds respectively. Results demonstrated that a period of about 50 days was necessary to reach a steady state. The two biofilters performed very well in regards to H2S; the complete removal of this compound was observed after a few weeks and was subsequently maintained for the rest of the experiment. However, VOC elimination was much less efficient. Biofilter 1 was only able to treat 20% of the inlet concentration while biofilter 2 removed 60%. Maximum elimination capacities of 25 g•m-3•h-1 for H2S and 5.3 g•m-3•h-1 for VOCs were obtained with biofilter 2. This project demonstrated the potential of biofiltration for the simultaneous treatment of H2S and VOCs. It was also possible to establish certain operating conditions necessary for proper operation and to determine that a two-stage system would be more efficient for the treatment of bitumen vapours.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||13 April 2018|
|Collection:||Thèses et mémoires|
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