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C. J. Penn, G. L. Mullins, L. W. Zelazny, J. G. Warren, and J. M. McGrath, “Surface Runoff Losses of Phosphorus from Virginia Soils Amended with Turkey Manure Using Phytase and HAP Corn Diets,” Journal of Environment Quality, Vol. 33, No. 4, 2004, pp.1431-1439. doi:10.2134/jeq2004.1431

has been cited by the following article:

• TITLE: Predicting Phosphorus Sorption onto Steel Slag Using a Flow-through approach with Application to a Pilot Scale System

  AUTHORS: Chad J. Penn, Joshua M. McGrath

  KEYWORDS: Phosphorus, By-Products, Phosphorus Removal Structure

  JOURNAL NAME: Journal of Water Resource and Protection, Vol.3 No.4, March 29, 2011

  ABSTRACT: Reducing phosphorus (P) loads from soils to surface waters is necessary for solving the problem of eutrophication. Many industrial by-products have been shown to sorb appreciable amounts of dissolved P from solution and it has been proposed to use P sorption materials (PSMs) such as steel slag in landscape scale “filters” for trapping dissolved P in runoff. The objective of this study was to model the effect of retention time (RT) and P concentration on P sorption by steel slag and a surface modified slag in a flow-through system. Sorption of P onto steel slag and rejuvenated-modified steel slag was measured using a traditional batch isotherm and a flow-through setting at several RTs and P concentrations. Flow-through data were used to produce a model that estimated P sorption based on RT and P concentration. The model was tested on a pilot-scale pond filter consisting of the same slag materials. For both the materials, flow-through tests indicated an increase in RT increased P removal efficiency but decreased the total amount of P removed at saturation. The Langmuir model developed from batch isotherms overestimated and underestimated P sorption in normal and rejuvenated slag respectively, relative to flow-through. Normal and rejuvenated slag removed 38 and 36% of P in the pilot-scale pond filter after 2 weeks of pumping. The Langmuir equation poorly predicted P sorption in the pond filter while the flow-through model produced reasonable estimates. Results suggest that flow-through methodology is necessary for estimating P sorption in the context of landscape P filters.