Skip to main content

Conquering Siloxane in Digester Gas Fueled, Engine Driven Cogeneration Systems

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


Organic silicon polymers (siloxanes) are increasing in use and are increasingly being detected at municipal sewage treatment facilities and landfills. Several forms of siloxanes are volatile and have been detected in gas evolved from the anaerobic digestion process at many publicly owned wastewater treatment plants (WWTPs). The presence of siloxane compounds in digester gas used to fuel internal combustion engines that generate electricity and heat power (cogeneration) causes severe engine maintenance problems that are related to silicon deposits in piston cylinder and valve head assemblies. At the Annacis Island WWTP in Vancouver, British Columbia and at the Alvarado WWTP in Union City, CA, siloxane related engine maintenance problems lead to decisions to terminate digester gas fueled engine operations.

Both plants were motivated to quickly identify and implement systems to mitigate siloxane related engine maintenance problems. After quick review of available options, both plants implemented digester gas treatment systems consisting of gas dehumidification followed by activated carbon adsorption. Activated carbon systems were simple and relied on replacement of exhausted carbon as opposed to on-site regeneration. Activated carbon was extremely effective at eliminating siloxanes from digester gas and carbon life was as expected or better. Removal of siloxane resulted in reduction of build up of silicon in engine oil and dramatic improvements in engine operation as well as reduction in maintenance costs. Maintenance cost reductions greatly exceeded the cost of operating the siloxane removal system.

Document Type: Research Article


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 These proceedings are not peer reviewed.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
  • Ingenta Connect 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
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