FERNANDES NETO, J. T.; http://lattes.cnpq.br/3412270903373859; FERNANDES NETO, José Theódulo.
Résumé:
Whit the growing od good quality water, not only for human
consumption, but also for some industrial applications, several purification
technologies on water has been implemented successfully, such as desalination
through reverse osmosis membranes, electrodialysis, thermal processes, ion
exchange resins and others. The system aims the production of pure water, whit
low electrical conductivity, which may be a research source for study and
producing waters for hospital and pharmaceuticals purposes, etc... It is our
understanding that these types of waters are very guarded by ANVISA and other
federal agencies and their physico-chemical and biological properties are subject
to change by the treatments to assess the quality of the product and the proper
functioning of the system. From the parameters of pH and electrical conductivity,
we observed a considerable decrease after regeneration of ion exchange resins
within 30 to 80 minutes of operation. The pH varied from 6.2 to 4.2 and after 40
minutes the electrical conductivity became constant, reaching 0.8 uS.cm"1,
indicating the regeneration. It can be observed in the present study a low salt
rejection in a resin II column, to a pressure of 8.2 kgf.cm"2, reaching a maximum of
30% indicating a little efficiency of the reverse osmosis desalinization systems,
unlike the other studied pressures (2.2 and 6.2 kgf.cm"2), where a rejection rate of
90% for most ions is observed.
