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Kinetic Model for Phosphate Transport and Transformation in Calcareous Soils: II. Laboratory and Field Transport¹

ABSTRACT

A first-order kinetic model was employed to predict, for selected soils, the response of the soil to phosphorus (P) applied in solution with 0.01M CaCl₂ in the laboratory, and the response of P in municipal wastewater at two rapid infiltration wastewater treatment systems. The one-dimensional steady-state hydraulic model appears to accurately predict (±50% of estimate) both the concentration of P in the solution phase as well as the accumulation of P in the solid phase.

¹ Contribution from U.S. Environmental Protection Agency, Office of Research and Development, Robert S. Kerr Environmental Res. Lab., Ada, Okla. Presented at the SSSA Annual Meetings, 6 Aug. 1979, Fort Collins, Colo.

² Soil Scientist, EPA, Ada, Okla., Member of Tec. Staff, Computer Science Corp., Huntsville, Ala., and Research Agronomist, EPA, Ada, Okla., respectively.

Received for publication August 24, 1979. Accepted for publication July 1, 1981.