Dealing with Fugitive Sewer Odours Resulting from Municipal Combined Sewer Separation Programs

Description:Dealing with fugitive sewer odours resulting from municipal combined sewer separation programs. Presenter: Yuko Suda, P.Eng., Kerr Wood Leidal Associates Ltd. Many municipalities are aggressively pursuing separation of their combined sewers into storm and sanitary systems. One often overlooked problem when separating the sewer systems is fugitive odour release, and resulting odour complaints. Combined sewers typically do not have significant odour issues because the BOD of the sanitary component is diluted by the storm component. As the combined system is separated, the sanitary sewer portion of the separated system will develop odour issues. Odours are typically released as a result of local pressurization of the air space in the sewer system. Sanitary sewer systems have relatively few and easily identified air release points for foul air (such as manhole lids, building roof vents, and pump stations). Conversely, a storm sewer system has many potential release points for foul air. The consequence of this is that odours generated in the sanitary sewer portion of a partially separated system can travel into the storm portion and release through its many atmospheric connections, potentially resulting in more odour complaints than a fully separated system would have. Because many of these odour issues are interim, targeted strategies may offer the most effective – and cost-effective – solution over traditional, comprehensive odour control and air management techniques. Targeted strategies include a detailed identification of odour sources, limited air extraction and treatment, and isolation of combined sewer air spaces.

Authors: Yuko Suda

Subjects: Wastewater

Tags:2015 BCWWA Annual Conference & Trade Show,AC15,AC15 presentations

Citation:Stream 4: Sustainable Utility Management

Publication Date:May 29th, 2015 Upload Date:Jun 26th, 2015

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