Easy to Own Anaerobic Digesters: A Case Study of the Dry Creek WWTP in Nashville, TN

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Abstract:

Nashville Metro Water Services (MWS) decided to eliminate anaerobic digestion at the Dry Creek Wastewater Treatment Plant (DCWWTP) decades ago due to operator intensive and unreliable process control. Drivers including the need for additional disposal options, odor complaints, additional sludge storage and the desire to be more sustainable led MWS to reinstate anaerobic digestion at the DCWWTP in the mid 2000's. Two new 65-foot diameter anaerobic digesters with reinforced concrete, submerged, fixed covers (SFC) were designed to be robust, reliable, and capable of operating with minimal operator effort. SFC digesters are designed to achieve benefits similar to egg-shaped digesters, with a more economical construction cost. Operational flexibility was provided where practical to give operators the ability to adjust equipment as conditions changed. The DCWWTP digester facility has been operating as an “easy to own” facility, achieving 55-65% volatile solids reduction, since it was commissioned in late 2008.

Keywords: Anaerobic digestion; biosolids; foaming; operator friendly

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864710802767182

Publication date: January 1, 2010

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  • 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 These proceedings are not peer reviewed.

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