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Evaluating the Role of Point Sources Informs Statewide Nutrient Control Policy

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An evaluation of the costs, rate impacts, and environmental impacts of upgrading POTWs in the State of Utah to four levels of nutrient control allowed a variety of POTW nutrient control policies to be evaluated. POTW unit upgrade costs and rate impacts indicated that costs would be within a defined range for many POTWs, especially those with design capacities greater than about 40,000 m3/day (∼10 mgd). However, unit costs were significantly higher for some POTWs with lower desig n capacities, and nutrient upgrades to the most stringent levels would not be affordable for some communities representing about 15 percent of the service population. Methods for addressing the resulting equity issues include a hardship grants program and/or regulation based on a trading scheme. Analysis demonstrated that trading offers further advantages, including cost efficiency, flexibility to accommodate further nutrient reductions and population growth, and greater ability to interface with urban and rural non-point nutrient control. Consideration of “early movers” is desirable for any POTW nutrient control policy selected. The potential for future, more stringent effluent discharge requirements should be considered during the planning and design of POTW upgrades and expansions.

Keywords: Nitrogen; Nutrients; Phosphorus; Point Sources; Policy

Document Type: Research Article


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 These proceedings are not peer reviewed.

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