Influencia da aplicação de filmes monomoleculares para redução da evaporação na qualidade da água de reservatórios superficiais

Abstract

The ability to reduce water evaporation by ultrathin films of surfactants is known since 1925, but the first field experiment was conducted only in the 50s in Australia. This practice proved to be feasible and widespread to the point that there are now companies that sell industrial products to reduce evaporation. The present work aims to study the possible influences that these substances can cause in the physical, chemical and biological water where monomolecular films of hexadecanol were applied to reduce evaporation. The studies were done in cylindrical tanks of 20m2 surface area and 2m deep, constructed in the Campus do Pici, Universidade Federal do Ceará, and the quality parameters were: dissolved oxygen, conductivity, salinity, turbidity and color, pH , temperature and counting of phytoplankton. The results show small variations in the physico-chemical and microbiological especially the increase of water temperature in tanks with application of hexadecanol and quantitative difference of phytoplankton species identified in the two tanks