Abstract
Studies for the use of cleaner water treatment technology in open recirculation systems lead to the development of a treatment philosophy based on the search of an operation with ideal cycle of concentration. In this way, the material balance control in the cooling system may reach a concentration level which the circulating water exhibit naturally and, at the same time, low iron corrosion tendency and low calcium carbonate scale formation. The treatment using corrosion and deposit formation inhibitors would be only a complement, reducing the chemicals addition for the water conditioning. The present work intents to show that the treatment criteria based on the stability index is only a first approach. It does not consider the fact that water-soluble species do not concentrate by the same way, mainly due to conversion reactions involving the carbonate ion and the calcium ion precipitation.
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