PLANNING FOR THE FUTURE: EXISTING ANAEROBIC DIGESTION FACILITIES UPGRADED TO ACHIEVE CLASS A BIOSOLIDS

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Implementing pasteurization ahead of an existing digestion facility may be an effective and simple means to obtain greater pathogen destruction to Class A standards. Heat and energy balances show that implementing heat recovery will allow plants of sufficient size to utilize the biogas to maintain process temperatures with excess biogas for building heating or cogeneration. Heat balances will be given for a 50,000 gallons per day sludge flow facility to illustrate the overall process.

The process to destroy pathogens and stabilize solids has two distinct stages. The first stage solubilizes the biosolids and destroys pathogens in a pasteurization tank at 65.5°C (150°F). This achieves Class A pathogen reduction by fulfilling the time and temperature requirement as stated in Alternative 1 of the United States Environmental Protection Agency (USEPA) 503 Regulations. This tank would be located upstream of the anaerobic digestion. The anaerobic digester would provide stabilization and energy recovery through biogas generation. The following table, Table 1, summarizes bench-scale results achieved by pasteurization.

Pasteurization tank size and its impact on the sludge heating rate (boiler firing rate needed to process the daily sludge flow in batch mode) will be presented. Furthermore, the biogas quantity generated in anaerobic digestion maintains process temperatures if heat recovery is implemented. Heat recovery is defined as the utilization of the pasteurized sludge to prewarm the raw sludge. Detailed information on the sludge heat recovery system and equipment, benefits and possible drawbacks will be discussed.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864703784292160

Publication date: January 1, 2003

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 These proceedings are not peer reviewed.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