Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


In this study, technical aspects of biogas pretreatment and energy conversion at wastewater treatment plants were examined. Data were compiled from survey results, literature data and industry professionals. The efficiencies of various gas pretreatment technologies and a gas treatment train schematic are presented. The energy conversion efficiencies, maximum contamination limits, and the minimum biogas required to use each energy conversion technology are also presented.

The potential energy recovered is a function of the efficiencies of the energy conversion technology(s), natural gas supplementation (if applicable), biogas production rate and distribution of fuel (biogas and natural gas) to the energy conversion technologies, which may vary seasonally. Model plants were used to predict energy recovery potential with respect to plant energy consumption, for different plant sizes. Plant size was found to have little impact on energy consumption and biogas production on a flow basis. A medium sized (100,000 m3/day) model plant was selected for close examination of energy recovery potential. All cogeneration technologies were predicted to produce at least one-third of the plant electricity demands. Using gas engines for mechanical direct drive versus electricity production resulted in higher energy efficiency but there may be trade-offs of practicality. All technologies except steam turbines and molten carbonate fuel cells were predicted to produce enough heat for summer digester heating. Plants using cogeneration technologies likely require a boiler fueled with natural gas to supplement winter heating.

Document Type: Research Article


Publication date: January 1, 2005

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 These proceedings are not peer reviewed.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

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
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