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Copyright of Roca: Revista Científico-Educacional de la Provincia de Granma is the property of Universidad de Granma, Departamento Editorial and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Santiago de Cuba's bay is consolidated as the second most polluted marine ecosystem in the country, because it is the reservoir of much of the waste generated in the province. Among the industries that dump their residuals into the ecosystem, is the Soy Processing Company. Therefore, in the present work the quality of these residuals was evaluated based on the determination of chemical physical parameters. Samples were taken at the outlet of the plant to the receiving body, in the period from february to march 2019. The samples were analyzed in the "Elio Trincado" Laboratory of the Geominera Oriente Company and in the ENAST of Santiago de Cuba. Physical-chemical parameters were determined as: heavy metals, fats and oils, pH, conductivity, BOD and COD, comparing the values obtained with the NC 521: 2007 and NC 27:2012. The results revealed that heavy metals, conductivity and pH were within the norm, while the rest of the parameters fluctuated between values above the maximum permissible average limits established by cuban regulations. It is concluded that in these residuals organic compounds predominate, taking into account the high values of fats and oils, BOD and COD. [ABSTRACT FROM AUTHOR]

In this work, the most influential factors on the adsorption capacity of the dry biomass of Kluyveromyces marxianus CCEBI 2011 were determined on the removal efficiency of copper (II), zinc (II), and manganese (II) present in the waters of Laguna Azul del Cobre in Santiago de Cuba. Adsorption experiments used 0, 25 gL-1 of biomass, 3 pH levels (4, 4, 5,0 and 6, 2), as well as 3 levels of copper (II), zinc metal concentrations (II) and manganese (II) and five contact times (15, 30, 45, 60 and 90 min). The concentrations of the metals were determined by ICP in the "Elio Trincado" Laboratory of the Geominera Oriente Company. Of the 3 pH levels studied, the one with the best performance was of 6, 2. The tests at the studied concentrations showed significant differences in the percentages of removal, showed a better behavior at lower concentrations, obtaining for copper (II), zinc (II), and manganese (II) removal rates of 74,0 %; 98,8 % and 55 % in concentrations of 25, 2 and 10 mg.L-1, respectively. The dry biomass of Kluyveromyces marxianus CCEBI 2011 was able to remove by 52, 23 and 14 % copper (II), zinc (II) and manganese (II) respectively, present in waters of the Laguna Azul del Cobre, removal values lower than those achieved with synthetic solutions. The results show the influence of pH in the adsorption process. [ABSTRACT FROM AUTHOR]