Skip to main content

Janesville WWTP Upgrade Emphasizes Energy Saving Improvements

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Energy efficiency and improved utilization of available energy resources were essential elements of the City of Janesville's Wastewater Treatment Plant (WWTP) upgrade and expansion plan. Using 2008 data prior to the expansion, the WWTP's purchased energy as electricity and natural gas was 285.9 kWh/ML (1082 kWh/MG), placing them well above the 25th percentile of 356.7 kWh/ML (1350 kWh/MG) for WWTPs in efficiency1 In order to maintain or exceed this performance following expansion, energy goals were established early in the design process that included: no net increase in energy purchased, incorporation of at least one renewable energy generation system, LEED or Energy Star certification, and use of solar energy.

To date, the project's replacement of two aging biogas generators with microturbines has resulted in a 58 percent average increase in monthly electricity produced for comparable gas production at the WWTP and reduced maintenance costs. Integral heat recovery from the microturbines has thus far completely eliminated the requirement of supplemental natural gasfired boilers to maintain digester temperature. The installation of a 16.65 kW solar photovoltaic system on the WWTP administration building produces additional electricity which is sold back to the utility at a premium rate. Improvements including high efficiency aeration blowers, variable frequency drives, digester and gas storage upgrades, and efficient lighting and HVAC systems continue to improve overall process efficiency as they come online. Upon completion of the project, system and total process optimization will yield additional efficiency improvements
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: Biogas; Mircroturbine; anaerobic digestion; energy efficiency; solar energy

Document Type: Research Article

Publication date: 2011-01-01

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 These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed 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