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CASE STUDY TO WATER TREATMENT IN OPENED COOLING SYSTEMS WITH RECIRCULATION

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Author(s): PEREIRA, César Augusto; | CORRÊA, Sergio Machado

Journal: Periódico Tchê Química
ISSN 1806-0374

Volume: 9;
Issue: 17;
Start page: 17;
Date: 2012;
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Keywords: water | treatment | clean technologies

ABSTRACT
The water treatment of open cooling systems with recirculation is based on the operation ofconcentration cycles, with corrosion inhibitors and deposits preventers only with complement. This technologydoes not consider the presence of soluble chemical species which lead to problems to the stability indexes. Thiswas studied in an experimental design in an open water recirculation treatment system with an evaporativecondenser of a chemical industry. It were collected samples of the reposition and recalculating waster atdifferent levels of concentration, by changing the purging system. The parameters analyzed were pH, partialand total alkalinity, calcium roughness, chloride, conductivity, and also experiments with a corrosion proof. Theresults obtained in real operation conditions showed that the concentration of bicarbonate ion changes in adifferent way, when compared with the soluble ions as chloride. If the traditional treatment was used severalstability indexes must be considered along the system and not a unique index, capable to establish all treatmentprocess. It is presented that must be considered that the quality of the reposition water have to present specificconditions, as a previous treatment. Great care must be taken to use the water reuse in these systems, as anusual practice nowadays. The clean technology in these systems have limited use and must be revised,because can lead to conditions adverse to this technology, using greater quantities of chemical products.
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