Skip to main content

The Ultimate Anaerobic Biodegradability of Municipal Sludge and FOG

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The anaerobic biodegradability of three types of municipal sludge (primary, secondary, and dewatered secondary), as well as two types of partially dewatered (polymer dewatered and lime dewatered) fat, oil and grease (FOG) was assessed at 35°C using a previously digested anaerobic sludge as seed. Samples of these five components, as well as various combinations of the individual components were tested. Under batch conditions, the sludge initial loading was 3 kg VS/m3 and the highest FOG loading tested was 1.23 kg VS/m3. At the end of the 120 days incubation, the extent of the VS destruction was equal to 56.7, 23.3, 26.7, 70.7, and 78.3% and COD destruction was equal to 58.5, 26.3, 30.5, 70.8, and 82.2% for the primary, secondary, dewatered sludge and the polymer- and lime-dewatered FOG samples, respectively. The methane yield was 470, 179, and 247 mL methane @ STP/g sludge VS added for the primary, secondary, and dewatered sludge samples, respectively. In contrast, the methane yield for the two FOG samples was 993 and 878 mL methane @ STP/g FOG VS added for the polymer- and lime-dewaterd FOG samples, respectively. Primary sludge and FOG degradation occurred significantly faster than the degradation of dewatered sludge and TWAS. Following an initial period of 3 to 5 days, FOG degradation followed approximately first-order kinetics with a rate constant in the range of about 0.1 to 0.15. The remaining of the samples did not follow first-order kinetics, with their fist-order rate coefficients decreasing with digestion time. There were indications of increased degradation with increasing FOG loading of the previously digested sludge that was used as seed. The ultimate degradation of the various combinations could be predicted based on the ultimate degradation of the three sludge and two FOG tested components.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics


Document Type: Research Article

Publication date: 2007-10-01

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