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Air Flow in Sewers

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Air flow in sewers is often neglected during sewer design despite its importance in controlling the occurrence of odor problems and the development of corrosion-inducing atmospheres within the sewer. These issues have become more pronounced in the large, deep interceptors that are now frequently used to convey and store wastewater to control overflows. While studies of air flow in sewers have been conducted (WERF, 2009), they have not considered fan-driven ventilation, which is the way odor and corrosion are frequently addressed. This paper discusses sewer ventilation and presents an approach to calculating air flow (both co-current and countercurrent) in sewers applicable to fan-driven systems. A criterion for the negative pressure that needs to be maintained in the sewer to avoid air escape is developed accounting for stack effects. An application to a major tunnel system is presented.
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Document Type: Research Article

Publication date: 2012-01-01

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