Diseño e implementación de tres tipos de sistemas de oxigenación para depósitos de agua de riego en el invernadero de horticultura en la Facultad de Recursos Naturales

Abstract

The water in the horticultural greenhouse tanks did not have the amount of disolved oxygen necessary for the plants to assimilate the nutrients well according to research carried out by the engineer in charge of the horticultural greenhouse, so a study was made of all the oxygenation methods and systems most used in the industries, the main characteristics of each one of them were analyzed, and the three most suitable for the conditions of the greenhouse tanks were chosen. The systems that were chosen are: recirculation, gravity and mechanical oxygenation, the same ones that were implemented so that the dissolved oxygen is above 7 mg/l, with a monitor the corresponding data was taken in each one of them and it was determined that all three increased the dissolved oxygen in such a way that fulfill the required needs. In order to provide a recommendation for the choice of appropriate oxygenation systems, two important parameters were taken into consideration: the increase in the amount of dissolved oxygen and the economic parameter. Considering the technical part, the system that has a higher oxygenation is the machanical one, while the economic part the most profitable one is the gravity one, alternative that was obtained after a calculated cost-benefit analysis, to identify the optimal alternatives and that costs for its implementation are not high. With a timer for irrigation programming, a control system was implemented so that the amount of dissolved oxygen remains constant. For this purpose, some tests were made varying the on and off times, and it was concluded that the optimum oxygenation time is 30 seconds every 5 minutes, this prevent a considerable drop in disolved oxygen. For a correct operation of the systems it is recommended to carry out a periodical maintenance and operation plan.