Skip to main content

A Perfect Synergy of Pathogen Reduction and Renewable Energy – The Columbus Water Works CBFT3 and Cogeneration System Project

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Brown and Caldwell and Columbus Water Works (CWW) located in Columbus, Georgia, have led the development of a new Class A digestion process named Columbus Biosolids Flow-Through Thermophilic Treatment (CBFT3). The new process offers a low-cost option – as compared to other EPA approved processes – for upgrading existing anaerobic digestion facilities from Class B to Class A Biosolids. To achieve Class A pathogen reduction, an existing completely-mixed mesophilic digester was converted to operate at thermophilic temperature and is followed by two plug flow reactors (PFRs) operated in series to achieve a minimum contact time of 30-minutes. Sludge is then further digested in the two existing mesophilic digesters to achieve additional volatile solids destruction.

This project also incorporates a combined heat and power (CHP) or cogeneration system that will generate about 40-percent of the plant's electricity demand as renewable green power using digester gas that would otherwise be flared. Heat recovered from the cogeneration system will be used to heat the digestion process in its entirety. Construction of the CBFT3 and Cogeneration System Project is complete and process start-up activities are underway. This paper presents a summary of project goals and benefits, background information regarding project research and engineering evaluation results, and a description of the construction elements and facility improvements.

Keywords: Class A Biosolids; Cogeneration; Combined Heat and Power; Green Power; Renewable Energy; Temperature-Phased Anaerobic Digestion; Thermophilic Anaerobic Digestion

Document Type: Research Article

DOI: https://doi.org/10.2175/193864710802767001

Publication date: 2010-01-01

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 These proceedings are not peer reviewed.

    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 ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
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