Ozone Model for Drip Irrigation Systems

摘要

Ozone concentration was modeled along a subsurface drip irrigation system. The project generated two models; a model with two-phase flow with ozone in the gas and liquid phases within the tube, and a model with single-phase flow using only aqueous ozone. The equilibrium concentrations of ozone in the gas and liquid phases were calculated with Henry's Law. The models were evaluated with field experiments in which ozone was produced and injected into a drip irrigation system. In order to obtain a control measurement, in some experiments, ozone gas was removed prior to the drip irrigation tube by a degasser. Three water qualities were used in the experiments, potable water with chlorine, open storage tank water with high organic matter concentration, and open storage tank water with low organic matter concentration. Water was collected every 10 m along the irrigation system and aqueous ozone concentration was measured. The best-fit degradation coefficient for potable water was 0.003/s, and for storage tank water (for both high and low organic matter concentrations) was 0.004/s. This ozone model could be used in the field to calculate the required ozone production rate and concentration at the injector in order to maintain an acceptable concentration at end of the irrigation system.