2. San Carlos University of Guatemala

Abstract: Amatitlán lake in Guatemala is part of the group of water bodies that are in an accelerated process of contamination and artificial eutrophication. That is, an excessive development of algae due to the presence of mineral salts called nutrients, particularly nitrogen (N) and phosphorus (P). The purpose of the research was to evaluate the ability of oxygen nanobubble technology to reduce nitrogen (N) and phosphorus (P) as main parameters. In addition, influential parameters such as: pH, suspended solids, turbidity, temperature, and dissolved oxygen were considered. The investigation was of an experimental nature, it consisted of taking a sample of 33 m³ of water with a high organic load and cyanobacteria, Microcystis aeruginosa. Nanobubble was applied with the KRAN200 machine for eight days operating two hours and 45 minutes per day, making a total of 19 hours, six samples were obtained, the first was the control sample. The results obtained were favorable; for nitrogen a reduction of 68.7% was obtained, and for phosphorus of 55%. The results were compared with quality standards from Mexico and Peru, for oligotrophic lakes.