Evaluación del efecto de la plata coloidal, en la remoción de escherichia coli y la obtención de un agua salubre a partir de filtros caseros

Abstract

Water is a natural and indispensable resource for life, for this reason it is very important to supply it, in a drinkable, affordable and good quality way to be supplied to the community in general, fulfilling the physicochemical characteristics, Microbiological and sanitary concept, established in the standard, Resolution 2115 of 2007. However, despite drinking water being a right, many communities, especially rural ones, still do not have access to quality water; presenting Diarrheal Watered Diseases (EDA) and Foodborne Diseases (ETA) which are induced by the intake of unhealthy water, among other factors that help to spread the disease. For this reason, alternative techniques and / or processes for water treatment have been sought, among which techniques such as home filtration systems for obtaining drinking water have been highlighted. These filters are composed of various materials, such as colloidal silver, activated carbon, which possess antimicrobial potential and / or retention capacity of substances and microorganisms. In order to mitigate the EDA and ETA, the REPLACOL microenterprise developed and provided the EKOFIL filtration systems impregnated with colloidal silver, and was sought as: Objective: To evaluate the effect of colloidal silver on the removal of Escherichia coli in obtaining a safe water from homemade filters. Methodology: The process of water purification was carried out in the facilities of the Santiago de Cali University, subjecting the home filters to certain concentration of synthetic water, that is; 103, in accordance with the inoculation provided from E. coli strain ATCC 25922 employed by membrane filtration (FM) for the diagnosis of water quality at certain times of 1, 8 and 24 hours of silver contact with filtered effluent and residual silver. Through statistical analysis (Kruskal-Wallis and post anova) they were obtained as: Results: The determination of the best contact time in conjunction with the best filtration rate by home filters therefore determined the filter defined as E 1.0 which managed to remove up to 3.9 logarithmic units from the initial synthetic water. Conclusion: The efficiency of removal of the E 1.0 filter with respect to the other systems is observed, determining that the best contact time occurs at a time of 8 hours with a filtration rate of 1L / h where the removal reaches up to 100 % of effectiveness