2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 3:15 PM - 3:30 PM | COMPARISON OF DIFFERENT METABOLISM MEASUREMENT METHODS TO EVALUATE IMPACT OF WASTEWATER TREATMENT PLANT EFFLUENT DISCHARGE ON AN URBAN STREAM | 310 A
COMPARISON OF DIFFERENT METABOLISM MEASUREMENT METHODS TO EVALUATE IMPACT OF WASTEWATER TREATMENT PLANT EFFLUENT DISCHARGE ON AN URBAN STREAM
Point source nutrient discharges to urban streams spur in-stream metabolic activity, but there may be limits to this increase. We used multiple methods to determine in-stream metabolism, including plateau injections of the Raz-Rru metabolic tracer system, diurnal dissolved oxygen modeling, and longitudinal nutrient patterns, along two reaches of the same second-order stream in urbanized Montgomery County, PA. Each reach was directly below the outfall of a wastewater treatment plant. In the 2000m below the outfall of the upstream, headwater treatment plant, N and P concentrations decreased by 10-15%, Raz to Rru transformation was approximately 30%, and ecosystem respiration on the day of the tracer injection was 7.8 g O2 m-2 d-1. In comparison, in the 1500m below the downstream treatment plant, nutrient concentrations increased, Raz did not measurably transform, but daily ecosystem respiration was 7.9 g O2 m-2 d-1. The upstream reach had a higher percentage of flow from the treatment plant than the lower reach. The lack of agreement between methods shows the need to use multiple metabolism measurement methods in high nutrient urban streams to parse out hydrologic and metabolic controls on in-stream nutrient concentrations.
- Anthropogenic
- Metabolism
- Nutrients
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Presenters/Authors
Sarah Ledford
(), Department of Earth and Environmental Science, Temple University, sarah.ledford@temple.edu;
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Marie Kurz
(), The Academy of Natural Sciences of Drexel University, mk3483@drexel.edu;
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Laura Toran
(), Department of Earth and Environmental Science, Temple University, ltoran@temple.edu;
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