Stankovic, N; Purenovic, M; Randelovic, M; Purenovic, J
The main quality indicators for natural and geothermal waters are physical, chemical and biological ones. The most important chemical indicators of geothermal water qualities are: pH value, water hardness, p- and in-alkalinity, concentration of CO2, dissolved oxygen, sulphates, chloride, fluoride, sulphides, bicarbonates, calcium, sodium, magnesium, manganese, iron, aluminium, metasilicic and boracic acid, different types of nitrogen, dry residue and others. The best way to use geothermal waters is with their spring composition and natural physical parameters, with possible temperature decrease. But, due to incrustation and solid deposition formation, considerable changes of spring chemical composition occur, some valuable microelements (selenium, sulphur, fluorine, coloid SiO2) are lost. In this paper special attention was paid to prevention of solid deposit formation; on the one hand to prevent valuable elements loss and to make therapeutic use of geothermal waters possible, and to heat objects, settlements and greenhouses, on the other. Since nucleation and solid deposition are responsible for incrustation process, an inhibitor was found, consisting of emulsion soluble surface active matters and sodium tripolyphosphate, whose components are extremelly effectivelly adsorbed on already present solid particles and on agglomerated associations of coloidal SiO2, so further agglomeration is prevented, as well as deposit precipitation, carbonate seed and other deposits growth. By the use of this modificator, called Antiinkrustal puroni 2000, deposit formations on the pipeline walls of heating systems and other hydroinstallations are prevented, geothermal water softens and its spring composition is maintained.