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ARS Home Northeast Area University Park, Pennsylvania Pasture Systems & Watershed Management Research Research Publications at this Location





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Title:   Author  item
                                            ALLEN, ARTHUR - University Of Maryland Eastern Shore (UMES)item
                                            Buda, Anthonyitem
                                            Kleinman, Peteritem
                                            Church, Clintonitem
                                            FELTON, GARY - University Of Marylanditem
                                            BOSE, SALIL - Constellation Energyitem
                                            Bryant, Ray
  Submitted to: Journal of Soil and Water Conservation
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/11/2011
                                    Publication  Date: 7/17/2011
                                    Citation: Allen, A.L., Buda, A.R., Kleinman, P.J., Church, C., Felton, G.K., Bose, S., Bryant, R.B. 2011. Removing soluble phosphorus from agricultural drainage waters using FGD gypsum filters. Journal of Soil and Water Conservation. 41:664-671.Interpretive Summary: An interpretive summary is not required.
                                Technical Abstract: Decades of applying chicken litter to meet nitrogen demand has led to accumulation of phosphorus (P) in soils of the Delmarva Peninsula. This legacy P that now approaches levels up to ten times the agronomic optimum is a major source of P entering drainage ditches that eventually empty into the Chesapeake Bay. A Flue Gas Desulfurization (FGD) gypsum ditch filter, constructed in April, 2007, precipitates soluble P as calcium phosphate. Although the filter removed 75% of soluble P from water that passed through the filter, large flow events exceeded the maximum filtration rate, and P-rich water bypassed the filter. Subsequent research on Coastal Plain soils of the Delmarva showed that lateral groundwater flow, during storm events when water tables are high, is the major pathway for soluble P delivery to ditches. In a phase two design, gypsum-filled trenches parallel to the drainage ditch were installed and monitored. Lateral flow was not obstructed by these “gypsum curtains,” and soluble P was reduced by 50 to 95% as groundwater passed through the gypsum. Construction of a berm over the buried gypsum forces surface runoff to infiltrate and pass through the curtain, thereby treating 100% of the water entering the ditch. Surface application of gypsum to enhance infiltration and improve subsurface drainage is being investigated. Environmental concerns about slightly higher levels of mercury and arsenic in FGD gypsum than in naturally occurring mined gypsum have proved unfounded. Gypsum filters effectively remove soluble P and provide a beneficial use for an industrial byproduct.


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