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Nitrogen removal in constructed wetlands in Connecticut Zulimar - PowerPoint PPT Presentation

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Nitrogen removal in constructed wetlands in Connecticut Zulimar Lucena zulimar.lucena@yale.edu February 19, 2014 Long Island Sound Source: CT DEEP Objectives Evaluate the effectiveness of constructed wetlands in removing nitrogen from

  1. Nitrogen removal in constructed wetlands in Connecticut Zulimar Lucena zulimar.lucena@yale.edu February 19, 2014

  2. Long Island Sound Source: CT DEEP

  3. Objectives • Evaluate the effectiveness of constructed wetlands in removing nitrogen from stormwater in the Long Island Sound Watershed. • Identify the key factors that contribute to stormwater nitrogen removal efficiency in constructed wetlands.

  4. Study Sites Thornton Lake Whitney Davis

  5. Study Sites E Elderslie L M Marion Lois

  6. Methods • Water flow was determined using stage-discharge relationships: • Weirs • Pressure transducers for water level

  7. Methods: Water Quality • ISCO Autosampler 3700 at wetland inlet & outlet • Manual composites • One flow-weighted sample per storm for influent & effluent • Samples were analyzed to determine Event Mean Concentration (EMC) and N loads.

  8. Sample Collection Period Thornton n= 21

  9. Thornton: Removal Rates Lake Whitney

  10. Thornton: Effluent vs. Influent

  11. Sample Collection Period Davis n= 9

  12. Davis: Removal Rates Lake Whitney unmeasured inflow (baseflow and stormflow) results in inflow<outflow

  13. Davis: Effluent vs. Influent NS

  14. Conclusions • Thornton: • Significant biogeochemical N removal • Main mechanism for N removal is hydrologic • Davis: • Hydrology issues • Biogeochemical removal not significant Lake Whitney

  15. Other sites • Lois & Marion • Data from 9 to11 storms • Hydrology issues • Elderslie • Few storms, only one with outflow • Additional data collection

  16. Future Work • Assess explanatory variables • Residence times • Input N concentrations • Wetland-watershed area ratios • Soil organic matter content • Vegetation Lake Whitney

  17. Acknowledgements Funding • CT Sea Grant • Connecticut Association of Wetland Scientists • Hixon Center for Urban Ecology, Yale University • Carpenter-Sperry Fund, Yale University Field Assistants • Lisa Weber • Tatiana Hayek • Jancy Langley • Kevin Sherrill • Michelle Camp • Jocelyn Mahone • Kris Van Naerssen • Uma Bhandaram • Zhemin Xuan • Jamie O’Connell • Michael Kravitz • Bunyod Holmatov

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