Skip to main content

Expanding the Use of Activated Sludge at Biological Waste Water Treatment Plants for Odor Control

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


Odors from wastewater treatment plants (WWTPs) are composed of a mixture of gases, predominantly reduced sulfur compounds, such as hydrogen sulfide (H2S) and volatile organic carbon (VOC) compounds. Their emissions can be prevented by the biological and chemical constituents commonly found in activated sludge, which is often employed for biological wastewater treatment. The use of activated sludge for odor control may take place through a number of processes, including activated sludge diffusion (ASD) or activated sludge recycle (ASR). ASD operates by sparging foul air, collected from covered or contained sources, into an activated sludge bioreactor in place of normal ambient process air. ASR operates by pumping activated sludge mixed liquor from an activated sludge bioreactor or settled activated sludge from secondary clarification to the plant inlet works, capturing odorous compounds before they volatilize from the liquid phase. In this paper, the design issues, practicalities and performance of these technologies are discussed based on existing published technical papers as well as recent field experience by CH2M HILL. The use of an existing resource at a WWTP (activated sludge) can in certain situation offer the possibility to reduce or eliminate the high investment costs associated with conventional odor control measures to reduce operating costs and provide high performance odor control for wastewater treatment plants. The use of activated sludge (often considered as a waste product) should be considered at WWTPs as part of the odor control management.

Document Type: Research Article


Publication date: January 1, 2012

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more