REMOVAL OF HEAVY METALS FROM GALVANOPLASTY INDUSTRY EFFLUENTS: EQUILIBRIUM DATA MODELING OF ISOTHERMIC ADSORPTION BY 4A ZEOLITE

Reference Presenter Authors
(Institution)
Abstract
06-017 Elton Mendes Mendes, E.(Universidade do Extremo Sul Catarinense); Rocha, J.V.(Universidade do Extremo Sul Catarinense); Mendes, E.(Universidade do Extremo Sul Catarinense); Angioletto, E.(Universidade do Extremo Sul Catarinense); Galvanoplasty consists in the electrolytic process for the parts metallic coating. In the galvanic process the metal parts are washed several times by wash baths immersion. These baths make up the largest volume of effluents containing heavy metals. In general, zinc baths consist of conducting salts, complexing agents and metal carriers solutions. These effluents treatment process with adsorbent materials is appropriate to increase the heavy metals removal efficiency. The use of zeolites as adsorbents meets contaminants retention requirements in effluents, reducing environmental impacts. This study aims to model the zinc isothermal adsorption equilibrium data using zeolite 4A as adsorbent material determining the maximum solute adsorption capacity for the operation. The equilibrium data were adjusted by three isothermal equilibrium adsorption models: Langmuir, Freundlich and Redlich-Peterson. Langmuir model was selected for adjusting the equilibrium data for the zeolite-zinc system. Adsorption operation showed 14 h equilibrium time and maximum incorporation capacity qe = 2.99 mmol Zn2+/g zeolite. A galvanic effluent treatment proposal was elaborated from the equilibrium data obtained experimentally employing the adsorption process. Adsorption operation showed a 94% zinc ion removal efficiency in real effluent tests.
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