Skip to main content

A Little Dab Will Do: Acid Sludge Addition to Promote Phosphorus Release Prior to Anaerobic Digestion

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The Madison Metropolitan Sewerage District (MMSD) is planning an upgrade to its solids handling processes, which will include acid-phase digestion and phosphorus (struvite) harvesting. Research has been conducted for the past ten years by MMSD and the University of Wisconsin-Madison on methods to promote phosphorus release from waste activated sludge (WAS) to permit removal or recovery of the phosphorus prior to anaerobic digestion. Recent research has demonstrated that the planned acid-phase digester sludge added to WAS in small quantities promotes phosphorus release quickly, consistently, and with little added volume to solids handling processes. Using this method, phosphorus release rates from the WAS average 40% to 45% within approximately 6 hours. Volatile fatty acids (VFAs) contained in the acid sludge were confirmed to be the critical component in promoting the release. The most effective VFA:Total Phosphorus Released ratios were found to be in the range of 2.5:1 to 4:1, which is lower than typical values found in literature.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: Phosphorus release; VFA; acid phase digestion; acid sludge; anaerobic digestion; phosphorus harvesting; phosphorus recovery; struvite; volatile fatty acids; waste activated sludge

Document Type: Research Article

Publication date: 2011-01-01

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 These proceedings are not peer reviewed.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