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Simulated Solute Movement in Wastewater-Ponded Soil¹

ABSTRACT

A finite-difference numerical model was used to predict sorption and transport of P in a rapid infiltration land system for renovating urban wastewater. The soil was assumed to be water-saturated and two-dimensional steady flow was assumed to occur from a 2-m wide ponded recharge zone toward a subsurface collection drain located at a lateral distance of 3 m. The rectangular area of interest was bounded underneath by an impermeable layer at the 1-m depth and was limited to a lateral length of 5 m. Phosphorus sorption in the soil was assumed to occur as two consecutive kinetic reactions—rapid physical adsorption followed by slower chemisorption. Transient movement and sorption of P in the soil was predicted with the model for a step-function increase in P concentration in the applied waste-water. Results predicted by the model were used to construct plots of concentration isopleths of P in solution and sorbed phases in the soil. Sorption reactions removed P from the flowing solutions in the soil directly beneath the recharge area, resulting in a retardation of the concentration of P appearing in the drainage water. Simulated breakthrough curves for the concentration of a nonreactive solute in the drainage effluent compared well to those obtained with an approximate analytical model from published literature.

¹ Contribution from the Univ. of Florida, Gainesville. Published as Journal Series #6168.

² The first and third authors are Professor and formerly Laboratory Technologist, respectively, in the Soil Science Dep., Univ. of Florida, Gainesville 32611. The second author is Associate Professor in the Mathematics Dep.

Received for publication May 23, 1984. Accepted for publication January 2, 1985.

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