Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

The primary objective of this study is to compare various thermophilic anaerobic digestion processes and determine their ability to disinfect sludge to meet U.S. EPA's Class A pathogen requirements (40 CRF Part 503). Three processes were assessed for their ability to consistently meet fecal coliform requirements: (1) two-stage, thermophilic acid phase/mesophilic methane phase; (2) single-stage thermophilic; and (3) two-stage, mesophilic acid phase/thermophilic methane phase. Each process was evaluated at three different thermophilic temperatures (48, 52, and 62°C) against a mesophilic control at 35°C. The laboratory-scale reactors (30-liters) were brought to thermophilic temperatures rapidly from a mesophilic seed sludge and operated in a draw/fill mode. At corresponding temperatures, the single stage process showed greater fecal coliform removals than the first stage (thermophilic acid phase) of the two-stage process. Temperatures greater than 52°C for Process 1 (2-day residence time) or 48°C for Process 2 (15-day residence time) produced average effluent fecal coliform densities less than 1,000 MPN/g. TS (limit for meeting Class A fecal coliform requirement). The third process (two-stage mesophilic acid phase/thermophilic methane phase) performed the best, with fecal reductions meeting Class A standards with the second-stage methanephase reactor as low as 35°C. Since all three processes were able to meet Class A fecal coliform standards, in work planned within the next year, all three processes will be further evaluated. These evaluations will include pathogen seeding and full-scale implementation.
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: 2000-01-01

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 These proceedings are not peer reviewed.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