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The Western Regional Conveyance Tunnel Project (WRTP) is planned for construction in Western Boone County, Kentucky. The collection system upstream of the WRTP is under development, and flows from that system must be conveyed to the new Western Regional Treatment Plant. Northern Kentucky Sanitation District No. 1 (SD 1) is designing the WRTP for the conveyance and wet weather storage of flow to the treatment plant. The tunnel will consist of a 100-foot-long drop shaft (drop shaft no. 1) at the entrance to the tunnel, a 6.8-mile-long, 9.5-foot-diameter storage/conveyance tunnel, a flow control gate structure, followed by a 0.7-mile-long, 8.5-footdiameter storage/conveyance tunnel to the treatment plant. Odor must be controlled to prevent unacceptable levels of odorous emissions generated by and emitted from wastewater in the drop shaft and tunnel that could affect citizens in the surrounding community. Estimates of hydrogen sulfide (H 2 S) generation in the collection system upstream of drop shaft no. 1, emissions from drop shaft no. 1, and generation and emissions in the tunnel were estimated using sampling data, a computer model that predicts the generation, transport, and fate of H 2 S in wastewater collection systems, drop shaft air flow estimates using model developed equations, and a mass transfer spreadsheet model. The emissions estimates were used to optimize the selection and locations of the odor control technologies. KEYWORDSOdor, dropshaft, vortex, tunnel METHODOLOGYThe goal of the tunnel system odor control conceptual design was to estimate the concentration of odors in the tunnel headspace and air exiting the drop shaft. To do this, the following steps were followed:1. Estimate sulfides generated in the collection system upstream of the tunnel. 2. Estimate sulfide emissions from the drop shaft no. 1 (tunnel inlet). 3. Estimate sulfides generated and emitted in the tunnel. 4. Use the results of steps 1 through 3 to select and optimize the location and type of odor control technologies. 4664WEFTEC®.07

The Green Bay Metropolitan Sewerage District (GBMSD) will replace their existing solids handling facilities at their Green Bay Facility (GBF). The existing solids handling facilities are challenged by the following:• Aging facilities at the end of their useful life, increasing O&M and decreasing reliability • Pending Federal Clean Air Act Maximum Achievable Control Technology (MACT) air pollution regulations for sewage sludge incinerators that the existing multiple hearth incineration system cannot meet• A system now at full capacity because of the addition of waste activated solids from GBMSD's De Pere FacilityBetween 2008 and 2011, GBMSD and CH2M HILL developed a Solids Management Facility Plan that evaluated numerous solids processing technologies and process trains to respond to these issues. Seventy-three solids unit processes were considered, some were eliminated and the remaining 52 unit processes were used to develop 17 process configurations. Of these seventeen configurations, six alternative configurations were selected and evaluated in detail. The Digestion with Thermal Processing and Electrical Generation alternative was selected and later named the Resource Recovery and Electrical Energy Project, or R2E2.The paper evaluates energy recovery options from the anaerobic digestion and biosolids incineration system and uses for the recovered energy. Recovered energy from anaerobic digestion is converted to electricity and heat, while energy recovered from biosolids incineration is used for partial drying of the biosolids feed and other heating uses. The paper demonstrates the effective use of recovering and utilizing energy to replace a significant portion of purchased power and natural gas.