Abstract
Water resources are threatened globally and declining water quality is primarily due to stormwater, agricultural, urban, and mining runoffs. Steamboat Creek in Nevada is the largest non point source (NPS) of pollution to the Truckee River. Treatment wetlands are a cost-effective and reliable technique to control NPS pollution, therefore, a large-scale wetland along Steamboat Creek has been proposed as a component of a regional watershed restoration plan. This study used ten parallel pilot-scale wetland mesocosms, and tested the effects of drying and rewetting, hydraulic retention time (HRT), and high nitrogen loading on the efficiency of nutrient and total suspended solids (TSS) removal. Drying and rewetting produced noticeable effects on nutrient retention, but the effect was short-lived. During longer HRT period nutrient removal in manipulated mesocosms with an 8 h HRT were higher than controls with a 4 h HRT. Reducing the HRT from 4 h to 30 min further decreased nutrient interception. During increased influent nitrogen loading (9.5 ± 2.4 mg l−1), manipulated mesocosms functioned as sinks for total nitrogen (TN) with removal efficiency increasing from 45 ± 13% to 87 ± 9%. The average change in TN concentration was 9.1 ± 2.2 mg l−1. Drying/rewetting and varying HRT influenced total phosphorus (TP) and TSS similarly, and TP removal was associated with TSS removal. Results can help make decisions regarding wetland construction, management, and operation more effective in order to reduce nutrient loads to the Truckee River.








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Acknowledgements
This research was jointly funded by the Environmental Protection Agency (EPA) Region 9 and the Nevada Division of Environmental Protection. We thank the Truckee Meadows Water Reclamation Facility (TMWRF) for their help in operating wetland mesocosms. We also thank K. Naventhan, Richard Zehner, and other graduate and undergraduate students at the University of Nevada Reno for their field and technical assistance.
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Chavan, P.V., Dennett, K.E. & Marchand, E.A. Behavior of Pilot-Scale Constructed Wetlands in Removing Nutrients and Sediments Under Varying Environmental Conditions. Water Air Soil Pollut 192, 239–250 (2008). https://doi.org/10.1007/s11270-008-9651-x
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DOI: https://doi.org/10.1007/s11270-008-9651-x


