A recent Total Maximum Daily Load (TMDL) model and study for nitrogen on the South Platte River, Segment 14, in Colorado will result in new daily limits for the discharge of Total Inorganic Nitrogen (TIN). A large wastewater treatment facility is now undergoing a major capacity and
advanced treatment (denitrification) process expansion project in response to growth and to comply with the resulting TIN compliance order from the Colorado Department of Public Health and Environment. This paper presents the background and actions the Littleton/Englewood Wastewater Treatment
Plant has taken to respond to the compliance order and the impact a daily TIN limit will have on the plant's capital facility costs and long-term operations.
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