Laboratory Investigation of Ammonium and Nitrate Removal in Vertical-Flow Regimes in Planted and Unplanted Wetland Columns
Publication: Journal of Environmental Engineering
Volume 138, Issue 12
Abstract
Vertical-flow constructed wetlands were investigated for ammonium and nitrate removal from synthetic wastewater in bench-scale wetland columns. Total ammonia and nitrate were measured as wastewater and fed through planted and unplanted columns over three 4-week phases: downflow, upflow, and downflow-upflow in series. Mass balance results showed that downflow columns removed of influent ammonium, regardless of vegetation. Unplanted downflow columns removed 15% of nitrate and 14% of total nitrogen. Planted downflow columns removed only 1% of nitrate and total nitrogen. Unplanted upflow columns removed 55% of ammonium, 50% nitrate, and 31% of total nitrogen, whereas planted upflow columns removed 59, 60, and 40% of nitrogen species, respectively. For downflow-upflow columns in series, unplanted columns removed 79% of the ammonium, 1% of nitrate, and 4% of total nitrogen. In-series planted columns removed 93, 62, and 59%, respectively. These results suggest that downflow wetlands may be more appropriate for ammonium removal. Upflow wetlands achieve the best nitrate removal. For total nitrogen removal, downflow-upflow in-series wetlands may be better. Plants significantly improve nitrogen removal rates.
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Acknowledgments
The authors are grateful for support from the U.S. National Science Foundation Sustainable Futures IGERT (DGE 0333401) and Graduate Research Fellowship Program, the Water Environment Research Foundation (Project DEC11U06), the DeVlieg Foundation, and the Michigan Water Environment Association.
References
American Public Health Association (APHA). (1998). Standard methods for the examination of water and wastewater, 20th Ed., American Public Health Association, American Water Works Association and Water Environment Federation, United Book Press, Baltimore, MD.
Breen, P. F. (1990). “A mass balance method for assessing the potential of artificial wetlands for wastewater treatment.” Water Res., 24(6), 689–697.
Brix, H., and Arias, C. A. (2005). “The use of vertical flow constructed wetlands for on-site treatment of domestic wastewater: New Danish guidelines.” Ecol. Eng., 25(5), 491–500.
Cooper, P. (1999). “A review of the design and performance of vertical-flow and hybrid reed bed treatment systems.” Water Sci. Technol., 40(3), 1–9.
Cooper, P. (2001). “Constructed wetlands and reed-beds: Mature technology for the treatment of wastewater from small populations.” J. Chartered Inst. Water Environ. Manage., 15(2), 79–85.
Farahbakhshazad, N., and Morrison, G. M. (1997). “Ammonium removal processes for urine in an upflow macrophyte system.” Environ. Sci. Tech., 31(11), 3314–3317.
Farahbakhshazad, N., and Morrison, G. M. (2000). “A constructed wetland macrophyte system for retention of nitrogen in agricultural runoff.” Environ. Tech., 21(2), 217–224.
Fuchs, V. J. (2009). “Nitrogen removal and sustainability of vertical flow constructed wetlands for small scale wastewater treatment.” Doctoral dissertation, Michigan Technological Univ., Houghton, MI.
Fuchs, V. J., Mihelcic, J. R., and Gierke, J. S. (2011). “Life cycle assessment of vertical and horizontal flow constructed wetlands for wastewater treatment considering nitrogen and carbon greenhouse gas emissions.” Water Res., 45(5), 2073–2081.
Gross, A., Kaplan, D., and Baker, K. (2007). “Removal of chemical and microbiological contaminants from domestic greywater using a recycled vertical flow bioreactor (RVFB).” Ecol. Eng., 31(2), 107–114.
Langergraber, G. (2008). “Modeling of processes in subsurface flow constructed wetlands: A review.” Vadose Zone J., 7(2), 830–842.
Langergraber, G. et al. (2008). “Investigations on nitrogen removal in a two-stage subsurface vertical flow constructed wetland.” In Wastewater treatment, plant dynamics and management in constructed and natural wetlands, Vymazal, J.ed., Springer Science and Business Media B.V., Dordrecht, Netherlands.
Langergraber, G., Haberl, R., Laber, J., and Pressl, A. (2003). “Evaluation of substrate clogging processes in vertical flow constructed wetlands.” Water Sci. Technol., 48(5), 25–34.
Lee, B.-H., and Scholz, M. (2007). “What is the role of Phragmites australis in experimental constructed wetland filters treating urban runoff?” Ecol. Eng., 29(1), 87–95.
Meuleman, A. F. M., van Logtestijn, R., Rijs, G. B. J., and Verhoeven, J. T. A. (2003). “Water and mass budgets of a vertical-flow constructed wetland used for wastewater treatment.” Ecol. Eng., 20(1), 31–44.
Moreno, C., Farahbakhshazad, N., and Morrison, G. M. (2002). “Ammonia removal from oil refinery effluent in vertical upflow macrophyte column systems.” Water Air Soil Pollution, 135(1/4), 237–247.
Pell, M., and Nyberg, F. (1989). “Infiltration of wastewater in a newly started pilot sand-filter system: I. Reduction of organic matter and phosphorus.” J. Environ. Quality, 18(4), 451–457.
Prochaska, C. A., Zouboulis, A. I., and Eskridge, K. M. (2007). “Performance of pilot-scale vertical-flow constructed wetlands, as affected by season, substrate, hydraulic load and frequency of application of simulated urban sewage.” Ecol. Eng., 31(1), 57–66.
Rogers, K. H., Breen, P. F., and Chick, A. J. (1991). “Nitrogen removal in experimental wetland treatment systems: Evidence for the role of aquatic plants.” Res. J. Water Pollution Control Fed., 63, 934–941.
Torrens, A., Molle, P., Boutin, C., and Salgot, M. (2009). “Impact of design and operation variables on the performance of vertical-flow constructed wetlands and intermittent sand filters treating pond effluent.” Water Res., 43(7), 1851–1858.
Toscano, A., Langergraber, G., Consoli, S., and Cirelli, G. L. (2009). “Modeling pollutant removal in a pilot-scale two-stage subsurface flow constructed wetlands.” Ecol. Eng., 35(2), 281–289.
Wallace, S., and Knight, R. (2004). “Water Environment Research Foundation (WERF) wetland database.” Proc., 9th Int. Conf. on Wetland Systems for Water Pollution Control, IWA Publishing, Avignon, France.
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© 2012 American Society of Civil Engineers.
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Received: Sep 15, 2010
Accepted: May 16, 2012
Published online: May 18, 2012
Published in print: Dec 1, 2012
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