Procesos de fotocatálisis con luz solar y el método Dip – Coating para la reducción de coliformes de aguas residuales del Barrio La Ciénega con desembocadura en el embalse Agoyán.

Abstract

Photocatalysis processes were applied with sun light and the method Dip-Coating for the reduction of coliforms of the sewage of the Neighborhood La Cienega with outlet with the reservoir Agoyan. The investigation was developed with samples obtained of the Parish Ulba in the Canton Baños of Agua Santa and they were analyzed in the Water and Instrumental AAnalysis Laboratory of ESPOCH in the coliform reduction of the mentioned waters. It was followed this methodology: Sewage samples were taken from two different points for the process SODIS, <whose acronym in English is Solar Water Disinfection>, and SODIS/Dip-Coating; afterwards this, Titanium Dioxide (TiO2) was immobilized in 22 borosilicate glass rods with the aim to employ them according to the indications of the method SODIS/Dip-Coating by exposing the samples of each process to the solar radiation in different intervals of time 0; 60; 120 y 180 minutes and by making a growing of such samples in compact dry EC plates to identify coliforms and verify which photocatalytic is more efficient for its reduction, once, the efficiency of each process was determined. At the twelve days of starting the process, the number of fecal and total coliforms were quantified, the units were incubated at a temperatura of 35°C, and the final temperatura at the time of exposure of the samples was of 42°C within 180 minutes. The ohotocatalytic process SODIS/Dip-Coating was the best for the reduction of coliforms since with it was reached to decrease in a 97.21% of coliforms to the 24 hours, 12 days later, existed a reduction of the 2,79% more. Within the photocatalytic process SODIS, also the coliforms were reduced to 68.46% to the 24 hours. Twelve days later existed a reduction of 31.54% this indicates a reduction but not in a great system for more sophisticated photocatalytic processes, for experimental units.