This paper describes the mechanical ventilation schemes of a large sewer tunnel located in the Canadian York and Durham Regions. One of the major requirements for this sewer tunnel is to eliminate odor release to the ambient atmosphere. To satisfy this requirement, a ventilation system is developed in which odorous air is moved, within the sewer trunk headspace, to an Odor Control Facility (OCF) for treatment before being released to the atmosphere. The OCF is located at an intermediate location along the alignment of the trunk sewer; hence, odorous air is moved in co-current manner within the sewer line located upstream from the OCF. On the other hand, odorous air is moved in counter current manner within the sewer line located downstream from the OCF.
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