Recycling of wastewater containing iron-complex cyanides using UV photodescomposition and UV ozone oxidation in combination with an ion-exchange resin method.
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2005
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Wastewater contaminated with iron-complex cyanides was processed by UV photodecomposition accompanied by an iron elimination process using an iron-adsorbent. The wastewater processed by UV photodecomposition was oxidized by ozone combined with UV irradiation. The treated water was deionized by an ion-exchange resin method. This com bined processes further increased the production of the pure water volume compared to a single process using an ion exchange resin. The technique developed in this study can be summarized as follows. First, the iron-complex cyanides in plating wastewater were converted into aquapentacyanoferrate(III) [Fe(CN)5(H2O)]3 ion. Following the application of UV irradiation, it was decomposed into iron and cyanide (CN ) ion. The iron was removed from the water in the form of Fe(OH)3 by processing the wastewater with ozone and an iron-adsorbent. The CN ion was oxidized to the cyanate (OCN ) form by UV ozone oxidation in a relatively short time. The processed water was de-ionized by passing through cation and anion-exchange resins. The deionized water could be reused as rinsing water in a plating process. The results reported here suggest that wastewater contaminated with chemically stable iron-complex cyanides can be effectively recycled
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Fil: Hiromutsu, W. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Kazuko, Y. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Yasuhiro, K. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Hanela, S. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Hirayama, Y. Industrial pollution prevention protection Argentina.
Fil: Kazuko, Y. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Yasuhiro, K. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Hanela, S. Ministerio de Economía. Secretaría de Obras Públicas. Instituto Nacional del Agua. Subgerencia Laboratorio de Calidad de Aguas; Argentina.
Fil: Hirayama, Y. Industrial pollution prevention protection Argentina.