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Odor Control System for Nashville Central WWTP Biosolids Handling Facility

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Earth Tech and Archer Western were awarded a design-build contract for the new biosolids handling facility at the Nashville Central Wastewater Treatment Plant in Nashville, Tennessee. A key design feature of the new facility is the integrated odor control facility that has been designed to exhaust odors from all significant sources of odor.

The principal design philosophy for the new system was to provide a centralized biological technology to exhaust and control odors from all new sources at the new biosolids facility. Biological odor control technology (a biofilter) was the owner-mandated technology to be used for final odor control to align the treatment technology with other odor control facilities at the site and to support the owner, Metro Water Services' (MWS) green approach to plant operations.

The initial estimated flow requirement for the overall system was 50,000 cfm. Biofilter systems of this size are generally in-ground, multi-cell arrangements. In order to reduce cost and make use of other decommissioned facilities at the site, an unused final clarifier tank was chosen as the location for the biofilter.

This paper presents the details of the centralized approach to the design and flow requirements from the over 40 sources of odor being controlled as well as the system balancing approach used. Design features, system redundancy and operations considerations are discussed in detail as well as the specific performance requirements, odor dispersion modeling and the assessment of how biofilter performance was defined in order to achieve the required property line odor concentrations required by MWS.
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Document Type: Research Article

Publication date: 2008-01-01

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