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American Public Health Association, “Standard Methods for the Examination of Water and Wastewater,” 19th Edition, American Water Works Association, and Water Pollution Control Federation, American Public Health Association, Washington, 1995, p. 1050.

has been cited by the following article:

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

  AUTHORS: Genoveva Rosano-Ortega, Carlos Vega Lebrún, Juan M. López Oglesby, Sonia Martínez Gallegos, Daniel Cruz-González, Beatriz Pérez Armendariz

  KEYWORDS: Hydrotalcite-Like Compound; Wastewater; Sulfurous Underground Water; Ion Sorption; Green Cycle

  JOURNAL NAME: Green and Sustainable Chemistry, Vol.3 No.2, May 15, 2013

  ABSTRACT: 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.