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Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Green and Sustainable Chemistry 2013年第2期3卷 48-55页

作者： Genoveva Rosano-Ortega Carlos Vega Lebrún Juan M. López Oglesby sonia martínez gallegos Daniel Cruz-González Beatriz Pérez Armendariz Chemical Engineering Faculty Benemérita Universidad Autónoma de Puebla Puebla México Division of Graduate Studies and Research Instituto Tecnológico de Toluca México City México Research Department Universidad Popular Autónoma del Estado de Puebla (UPAEP) Puebla México

In this paper we are describing a green cycle process. The first step was a novel hydrotalcite-like compound (HTLC) synthesized by a co-precipitating method, under standard ambient temperature and pressure, using chemical industry wastewater rich in divalent and trivalent cations, activated by a thermal treatment and finally characterized by scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDS) and thermogravimetric analysis (TGA). The second step was a series of batch sorption tests performed with this activated HTLC and untreated underground sulfurous water from the state of Puebla, México. The HTLC calcined at 500°C/3 h exhibited the best sorption ability for ions, demonstrated a decrease of the hardness and sulfate ions to below the regional legal standards for drinking water. Once inactive after being used in water treatment, the sorbed ions were removed by ion exchange in a carbonate-containing solution, resulting in an 80% recycling of the material which upon activation demonstrated a retained capacity for water treatment. This recyclability suggests the exciting possibility of this novel compound as an efficient “green” technology in water treatment processes.

关键词： Hydrotalcite-Like Compound Wastewater Sulfurous Underground Water Ion Sorption Green Cycle

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Ag, Hg and Cr Precipitation for Recycling Derived of Hazardous Liquid Waste

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Green and Sustainable Chemistry 2013年第2期3卷 37-42页

作者： Silvia C. Gutiérrez-Gutiérrez Genoveva Rosano-Ortega Carlos Vega-Lebrún Juan Manuel López Pedro ávila-Pérez sonia M. martínez gallegos Daniel Cruz González Chemical Engineering Faculty Benemérita Universidad Autónoma de Puebla Puebla México Division of Graduate Studies and Research Instituto Tecnológico de Toluca Toluca México Research Department Universidad Popular Autónoma del Estado de Puebla (UPAEP) Puebla México Technological Research División Instituto Nacional de Investigaciones Nucleares Ocoyoacac México

Production of different compounds can generate large amounts of hazardous wastes which are dangerous to the environment and human health. The disposal or treatment of hazardous liquid waste rich in heavy metals like silver (Ag), mercury (Hg) and chromium (Cr) is difficult due to the strong acidity and toxicity which usually present in these contaminants. For this study, several research works were reviewed in order to obtain an efficient and viable treatment in time and removal efficiency. A series of chemical precipitations were evaluated for efficiency in the reduction of heavy metals in liquid waste. The precipitation of all three metals lasted 30 minutes and after treatment the wastewater presented concentrations of 0.064 mg·L-1 Ag, 0.010 mg·L-1 Hg and 0.048 mg·L-1 Cr, with a standard pH (7.5-8.5);with removal efficiencies of 94.31% for Ag, 99.99% for Hg and 98.17% for Cr.

关键词： Hazardous Liquid Waste Treatment for Recycling Silver Mercury Chromium

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