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• W2278773578 abstract "The water quality of the Eel River is threatened by the operation of a new wastewater treatment facility for the town of Plymouth, Massachusetts. Designed to discharge 1.25 million gallons of treated effluent per day into infiltration beds, this facility will add over 17,000 kilograms of nitrogen per year to the Eel River Watershed. Since this ecosystem is seasonally nitrogen-limited, such an increase of nitrogen could cause eutrophic conditions in the associated ponds. The Eel River Watershed Association is concerned about the long-term health of these water bodies, and is interested in finding a costeffective way to protect the water quality. Based on models of the threats to the Eel River Watershed by the MIT Eel River Investigation Team (MERIT), this thesis proposes a constructed wetland treatment system that will polish the wastewater facility effluent's nitrogen content below 2 mg/ before discharge into infiltration beds. This single-stage, vertical up-flow, sub-surface constructed wetland is designed to mirror the geochemical conditions of a natural system, so the mechanisms of ammonification, nitrification, denitrification and assimilation were investigated. As expected, the nitrification and denitrification mechanisms are the most important, but plants play a very important role in oxygenating the soil of the constructed wetland cells. However, assimilation of nitrogen by Phragmites australis accounts for less than 12% of the annual nitrogen attenuation, even with luxury uptake. Applying experience gained from constructed wetlands in locations with climates similar to northeastern United States, nitrogen balance calculations for this constructed wetland treatment system demonstrate a reduction of nitrogen concentration in the wastewater facility effluent from 10 mg/ 1 to 1.6 mg.1 Thesis Supervisor: Harold F. Hemond Title: Professor of Civil and Environmental Engineering Acknowledgments Studying the theory and applications of constructed wetlands for water treatment has been an exceptional learning experience and a motivating call-to-action on behalf of the environment. I wish to thank all of the numerous individuals who have created and facilitated this adventure. In particular, I extend my deepest appreciation to Professor Harry Hemond, a fellow Coastie, for his guidance throughout this year. You have been an inspiring professor and an excellent advisor. Thank you for sharing your voluminous knowledge of limnology and wetland ecology... I only wish I had time to learn more. Also at Parsons Lab, I would like to acknowledge Neda Farahbakhshazad, whose research and pilot studies with vertical up-flow wetlands is the foundation of this thesis. Thank you for sharing your knowledge and resources so openly. My heartiest thanks go to Pete Shanahan, coordinator for the MIT Eel River Investigation Team (MERIT), who has served as mentor, advisor, and professor while juggling his full time consulting job. Your professional advice and mentorship have been invaluable, not only to the completion of this thesis, but also to the discovery of the most compelling areas of a career in environmental engineering. I would also like to thank Mettie Whipple and the Eel River Watershed Association for their concern for their environment and sponsorship of the MERIT study and this thesis. It has been great to work for such a fantastic organization on such an important problem that has real-world impacts here in Massachusetts. Thank you for this opportunity. It has also been wonderful to be a part of MERIT, and I want to thank Kurt Herman, Arjun Nair and Adel Ahanin for the teamwork, cooperation and friendship they have shown me all year long. I hope we work together again in the future. Chian Siong, thanks for all the late-night bike rides back to Tang-keep your head down in the Singaporean Army. To the rest of the M.Eng. students, thank you for making this a great year in Cambridge and I hope our paths cross again.. .thank goodness (and Nabisco) for Oreo Cookies! Finally, I would like to thank my parents, Jory and Cal, for making this year both emotionally and financially possible, for not being offended when I wanted to live on campus, for always having a wonderful place to escape to, and for enabling me to follow my heart." @default.
• W2278773578 created "2016-06-24" @default.
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• W2278773578 date "2002-01-01" @default.
• W2278773578 modified "2023-09-27" @default.
• W2278773578 title "The design of a treatment wetland to polish municipal wastewater in the Eel River Watershed, Plymouth, MA" @default.
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