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Experiment and numerical simulation of nitrogen transport in soils irrigated with treated sewage

A Nitrogen‐2D model to analyse the nitrogen dynamics during treated wastewater application to FILTER (Filtration and Irrigated cropping for Land Treatment and Effluent Reuse) systems was developed. The model simulates both water movement and solute transformations in two‐dimensional saturated–unsaturated soil. The transformations of nitrogen in both organic and inorganic matters are considered. The transport equation includes the adsorption, nitrification, denitrification, volatilisation, and root uptake of the nitrogen with the general equilibrium equations. The effects of temperature, water content, N/C ratio, and pH on the nitrogen transformation are considered in the model.