Wei Zhang - Nutrient transport within three vegetative treatment areas receiving silage bunker runoff

Version 1

      Publication Details (including relevant citation   information): Faulkner, Joshua W., Zhang, Wei, Geohring,   Larry D., Steenhuis, Tammo S., Journal of Environmental   Management, 2011, 92 (3), pp   587-595

      Abstract: Silage bunker runoff can be a very   polluting substance and is increasingly being treated by   vegetative treatment areas (VTAs), but little information exists   regarding nutrient removal performance of systems receiving this   wastewater. Nutrient transport through the shallow subsurface of   three VTAs (i.e. one VTA at Farm WNY and two VTAs at Farm CNY) in   glaciated soils containing a restrictive layer (i.e., fragipan)   was assessed using a mass balance approach. At Farm WNY, the mass   removal of ammonium was 63%, nitrate was 0%, and soluble reactive   phosphorus (SRP) was 39%. At Farm CNY, the mass removal of   ammonium was 79% in the West VTA, but nitrate and SRP increased   by 200% and 533%, respectively. Mass removal of ammonium was 67%   in the East VTA at Farm CNY; nitrate removal was 86% and SRP   removal was 88%. The East VTA received a much higher nutrient   loading, which was attributed to a malfunctioning low-flow   collection apparatus within the settling basin. Results   demonstrate that nutrient reduction mechanisms other than   vegetative uptake can be significant within VTAs. Even though   increases in nitrate mass were observed, concentrations in 1.65 m   deep wells indicated that groundwater impairment from leaching of   nitrate was not likely. These results offer one of the first   evaluations of VTAs treating silage bunker runoff, and highlight   the importance of capturing concentrated low flows in VTA   systems.

      Address (URL): http://www.sciencedirect.com/science/article/pii/S0301479710003129