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Ammonia Volatilization from Marsh–Pond–Marsh Constructed Wetlands Treating Swine Wastewater

M. E. Poach*,a, P. G. Hunta, G. B. Reddyc, K. C. Stonea, T. A. Mathenya, M. H. Johnsona and E. J. Sadlerb

a USDA-ARS, Coastal Plains Soil, Water, and Plant Research Center, 2611 West Lucas Street, Florence, SC 29501
b USDA-ARS, University of Missouri, Columbia, MO 65211
c Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC 27411



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  		Fig. 1. Schematic of the marsh–pond–marsh constructed wetland design showing the sources and flow paths for swine wastewater.

 


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  		Fig. 2. Diagram of enclosure used to measure NH3 volatilization showing dimensions and component placement.

 


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  		Fig. 3. Regression by wetland section (marsh or pond) of NH3 volatilization versus monthly average N load.

 


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  		Fig. 4. Regression by wetland section (marsh or pond) of NH3 volatilization versus ammoniacal N concentration of wastewater in the plot. {dagger} If a data point is excluded from regression analysis, the regression equation is y = 0.06x + 1.92 (R2 = 0.31).

 




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