Comparing Three-Phase Thermophilic Continuous Feed System to Semi-batch Feed/Hold/Draw System

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Inland Empire Utilities Agency has three parallel anaerobic digestion systems each using threephase thermophilic digestion. The first phase is an acid digester operating at a temperature of approximately 35°C. The second phase is an anaerobic thermophilic gas digester operating in the range of 50°C to 56°C. No heat is added to the third phase. The operating temperature of the third phase depends on ambient weather conditions.

In one of the three process trains the thermophilic second phase is fed in a semi-batch basis (feed/hold/draw) and is operated at 56°C. The feed period is 4 hours, the hold period is 17 hours and the draw time is 3 hours. As such, the biosolids produced from this train meets the Class A requirements using Alternative 1 of 40 CFR Part 503 (U.S. EPA, 1993). The second and third process trains are being fed continuously and the thermophilic second phase is being operated at 50°C. Biosolids from these trains meet the Class A requirements of 40 CFR 503 using Alternative 3.

No significant difference has been observed between the semi-batch process operated at 56°C and the continuously fed train operated at 50°C. To date, all the pathogen samples for both processes have been non-detect. In fact, over 85% of the fecal coliforms samples have been nondetect

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864702785302771

Publication date: January 1, 2002

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 These proceedings are not peer reviewed.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
  • ingentaconnect is not responsible for the content or availability of external websites

Tools

Favourites

Share Content

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
X
Cookie Policy
ingentaconnect 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