El agua, sus propiedades y sus métodos más comunes para purificación

Abstract

Water is the most abundant and essential molecule for life on Earth, playing a central role in biological processes, climate regulation, and ecosystem functioning. Its unique physical and chemical properties—such as high specific heat, surface tension, and solvent capacity—make it indispensable for life, yet also susceptible to contamination. Major contaminants are classified as physical (suspended particles, microplastics), chemical (heavy metals, nutrients, organic compounds), and biological (pathogenic microorganisms). To ensure safe water, various purification methods are employed, including filtration, reverse osmosis, chemical disinfection through chlorination and ozonation, ultraviolet light, and thermal treatment. Each technique has specific advantages and limitations: filtration removes particles and some microorganisms; reverse osmosis eliminates salts and heavy metals with up to 99% efficiency; chlorination is economical but produces by-products; ozonation is effective without hazardous residues; UV light inactivates pathogens without altering water composition; and thermal treatment removes microorganisms but not chemical contaminants. Seawater desalination emerges as a viable alternative in water-scarce regions, with reverse osmosis as the most widely used method. The 2022 Monterrey water crisis, which affected over 5.3 million people, illustrates the challenges of urban water management and highlights the need for efficient purification strategies and responsible use. No single method can remove all contaminants; a combination of techniques adapted to local conditions is the most effective approach to ensuring equitable and safe access to water.