Skip to main content


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


Performance contracting provided the City of Baltimore and the Back River Wastewater Treatment Plant with the expertise and guaranteed savings to warrant implementation of a significant digester gas utilization system as well as other energy saving facility improvements.

The Back River process for wastewater treatment resulted in solids that were digested, producing methane gas, a good portion of which was burned off with flares up to 20 feet in the air visible from the surrounding area.

The new cogeneration process will clean and utilize all of the methane gas burned on-site and use it, thus reducing the need for flares. Some gas will be used in existing boilers and heaters, and the rest will run the generators that produce electricity. This process will reduce the city's purchase of electrical power by 1.4 million annually and effectively utilize the methane gas produced at Back River.

The savings resulting from reducing the amount of electricity purchased was sufficient to pay for the capital cost of the new facilities and other benefits including:

Annual reduction of 19.4 million kWh of electricity in plant operations.

14 million in energy savings and plant improvement projects over ten years.

Annual reduction of 12.9 million pounds of carbon monoxide and 7.7 grams of nitrogen oxide.

The following is a description of a unique process used to develop, implement, and finance the project.

Document Type: Research Article


Publication date: January 1, 2007

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 These proceedings are not peer reviewed.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
Partial Open Access Content
Partial 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