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Diffusion of odorous air into aeration basins is an effective and economical approach for odor control at wastewater treatment plants. Over 30 facilities in North America practice this technique. Most of these applications are for dilute or moderate strength air streams with relatively low hydrogen sulfide (H2S) levels. The lack of data documenting the effectiveness of the process and concerns for blower corrosion have limited its acceptance as a method for controlling odor emissions.

This paper presents a compilation and review of wastewater treatment facilities that are currently using activated sludge diffusion. Performance data are tabulated, and information on operation and maintenance of the blower/diffuser systems are summarized. New data are presented from pilot testing in Annapolis, Maryland that show the effectiveness in removing the reduced sulfur compounds typically found in emissions from biosolids processing operations.

Document Type: Research Article


Publication date: 2001-01-01

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