Planning for Future Growth through a Green Application
Abstract:The effluent discharge facilities at the Mill Creek Regional wastewater treatment plant in Johnson County, Kansas, are being expanded from a capacity of 34 mgd to 180 mgd to meet peak flow demands at ultimate build out of the watersheds served by this facility. Currently, treated effluent is pumped two miles through an existing 42–inch diameter force main to an effluent diffuser that discharges into the Kansas River downstream of a regional water intake serving the same community. Methods to discharge the treated flows were evaluated. The alternatives included a 96–inch diameter gravity tunnel and various pumping station alternatives. An option to discharge treated wet-weather flow upstream of the regional water intake was also evaluated. Based on the results of a 50-year present worth evaluation and triple bottom line analysis that included social, economic, and environmental factors, it was determined that a 96-inch diameter tunnel to carry effluent to the existing Kansas River diffuser provided the most cost effective and sustainable alternative. This paper presents the various alternatives and design considerations evaluated, results of the 50-year present worth analysis, and the various social, economic, and environmental factors evaluated in the triple bottom line analysis.
Document Type: Research Article
Publication date: January 1, 2011
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