Skip to main content

Innovative Treatment of Septage at Small Wastewater Treatment Plants

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


The objective of this paper is two-fold: 1) present the innovative concepts that were evaluated for treating septage using aerobic co-digestion of thickened waste activated sludge (WAS) and domestic septage and only routing the digesters decant to the plant headworks, and 2) summarize and present the results of the full-scale pilot program of this co-digestion process that was conducted at the 1.20 million gallons per day (mgd) Rollin-Woodstock Wastewater Treatment Plant (WWTP) in Lenawee County, Michigan. The full-scale pilot program, which was conducted between October 2006 and January 2007, used the two existing aerobic digesters at the plant to accept, screen and co-digest domestic septage and WAS.

In March 2006, the Lenawee County Drain Commissioner's Office retained Hazen and Sawyer, P.C. to conduct a septage acceptance study and complete a Project Plan report for the Central Lenawee Wastewater Treatment (WWTP) and the Rollin-Woodstock WWTP, located in Lenawee County, Michigan. The study was completed in June 2006, in response to the amendments to the State of Michigan Septage Waste Servicers law and due to the lack of septage receiving and treatment facilities within the County.

Based on the evaluation results and the limited or lack of capacity in the liquid stream at the plants, treatment of septage through the sludge handling process (solids stream) was explored and recommended, using aerobic co-digestion process of thickened waste activated sludge (WAS) and domestic septage. Due to the lack of experience, operational data and basis of design for using this aerobic co-digestion process, the report also recommended a full-scale pilot program to be implemented at the Rollin-Woodstock WWTP by using two of the existing aerobic digesters, for accepting, screening and co-digesting domestic septage with WAS. The goals of the pilot program were to gather data on the septage characteristics that can be used for properly sizing the plant upgrades, and determine the optimum operational procedures and conditions for accepting septage at the plant.


Document Type: Research Article


Publication date: October 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
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