Skip to main content

Design and Operational Considerations to Avoid Excessive Anaerobic Digester Foaming

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Excessive foaming in anaerobic digesters has been a problem for many years. All anaerobic digesters will foam to some extent, but excessive foam can be problematic. Excessive foaming is defined as foam that interferes with flow through the gas piping system and/or is not contained within the digester. Causes of foaming include presence of excessive filamentous bacteria, extreme amounts of oils and grease, and the feed sludge composition (primary sludge (PS) versus waste activated sludge), but the chief cause of excessive foaming is inconsistent feed to the digesters.

Many utilities have evaluated technological changes to the digester facilities. While such changes may reduce/control foaming, they often involve expensive additions to the facility in terms of both capital and operation and maintenance (O&M) costs. Consequently, before investing in technology changes, utilities should consider operational changes that could mitigate foaming.

In addition, facilities that are installing new digesters should consider design elements that can reduce the potential for foaming as well as the effects of foaming on ancillary equipment. Design considerations to avoid excessive digester foaming will be presented followed by three case studies of unstable operations at existing digester facilities, and operational considerations to avoid excessive foaming will be presented in relationship to the three case studies.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 01 January 2006

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 These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed 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