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Comparison of Two Predictive Nonequilibrium One-Dimensional Models for Phosphorus Sorption and Movement through Homogeneous Soils¹

ABSTRACT

Two models were tested for their ability to predict phosphorus breakthrough curves. The basic difference between the two models is the method of describing the kinetics of sorption. It was found, when comparing theoretically predicted breakthrough curves with experimental breakthrough curves, that the model using the kinetic equation S/t = a C^b S^d produced a better fit to the experimental data than a first order rate equation.

Key Words: chemical kinetics • diffusion • finite difference equation • computer simulation

¹ Contribution from U. S. Environmental Protection Agency, Office of Research and Monitoring, Robert S. Kerr Environmental Research Laboratory, Ada, OK 74820. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by EPA.

² Civil Engineer, Water Qualtiy Control Branch, and Research Chemist, Subsurface Environmental Branch, respectively.

Received for publication May 31, 1974.