The effects of colloidal SiO2 and inhibitor on the solid deposit formation in geothermal water of low hardness
2011
Stanković, N.J., Faculty of Sciences and Mathematics, Niš (Serbia) | Purenović, M.M., Faculty of Sciences and Mathematics, Niš (Serbia) | Ranđelović, M.S., Faculty of Sciences and Mathematics, Niš (Serbia) | Purenović, J.M., Faculty of Electronic Engineering, Niš (Serbia)
Low solubility of SiO2 and its occurrence in geothermal waters in the form of ionic, colloidal and suspended state are the main cause of the solid deposit occurrence. Certain chemical types of silica, under the influence of Fe2+, Al3+, F−, OH– and other micro-constituents, and due to significantly decreased solubility of SiO2, stimulate nucleation, particle growth and solid deposit formation. The aim of this work is to inhibit the process of nucleation and solid deposit formation by adding an originally designed inhibitor in the form of an emulsion, when the total concentration of the present and added colloidal SiO2 is beyond the solubility limit (120 mg/cubic dm). By turbidimetric, SEM, EDS and XRD analysis, the processes of solid deposit formation were investigated in Vranjska Banja (Serbia) spa geothermal water source (water hardness of 4 degrees dH), and theoretical and practical conclusions were made.
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