Desmineralização do esgoto sanitário tratado a nível terciário através da deionização capacitiva
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Data
2020-12-16
Autores
Tripoli, Constansa Valadares
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Universidade Federal do Espírito Santo
Resumo
Capacitive deionization (CDI) consists of an emerging technology for brackish water desalination, in which the ions are removed from the water, by means of an electrosorption process, and adsorbed on the electrode surfaces under the presence of the electric field, generating a flow of purified water. When the electrodes are saturated, the polarity of the applied electrical voltage is reversed and the ions contained in the double electrical layer are desorbed, producing a flow of concentrated water. This technology has advantages, no branch of conventional desalination technologies, particularly for brackish waters with intermediate salinities, highlighting the operation at room temperature and low pressures, high water recovery and no use of chemicals. However, its applicability as an advanced treatment alternative for sanitary sewage still generates uncertainties, mainly due to the complex composition. In this study, the evaluation of the performance of desalination under operating conditions of variable flow during a purification step, with constant flow in the rejection process, aims to increase the water recovery rates of the system, with electrical adjustments. as the rate of water recovery increased. Experimentally, it is evident that the increase in the water recovery rate, from the application of greater hydraulic loads during a purification stage, is an addition with reduced performance in the removal of salt. The combination of lower hydraulic loads and water recovery rates shows a tendency for greater ion removal efficiency. Regarding energy consumption by volume of treated water, there is an inverse relationship with the increase in hydraulic load and a direct relationship with an increase in the rate of water recovery.
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Palavras-chave
Deionização capacitiva (CDI) , Dessalinização , Adsorção , Parâmetros operacionais