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Scanning electron micrograph of typical structure of powder carbon steel ML-90 (×250)
The SEM micrographs in Figs. 3 and 4 show the micromorphology
of the powder carbon steel and PBC used in this study,
Campos, ValquiriaJournal: Environmental Earth Sciences
Issue 4DOI: 10.1007/s12665-009-0069-6Published: 2009-11-05Institution(s):
University of São Paulo
Inorganic elements analyses of Carapicuíba lake reveal that As, Cr, Pb and Mn are above the recommended drinking water standards. The mean total concentrations of toxic elements in surface water decrease in the order Mn > Cr > Pb > As. At elevated concentrations, toxic elements like Cr can accumulate in soils and enter the food chain, leading to serious health hazards and threatening the long-term sustainability of the local ecosystem. Absorbing materials has often been used to improve water quality. In this investigation three types of material were studied: the natural zeolite (mordenite); synthetic goethite and the powdered block carbon modified. The adsorption of Pb2+ and Mn2+ onto natural zeolite as a function of their concentrations was studied at 24°C by varying the metal concentration from 100 to 400 mg L−1 while keeping all other parameters constant. The low-cost zeolites removed Pb from water without any pretreatment at pH values <6. The maximum adsorption attained was as follows: Pb2+ 78.7% and Mn2+ 19.6%. The modified powdered block carbon effectively removed As(V) and Cr(VI) while goethite removed more chromate than arsenate in the pH range 5–6. Results of this study will be used to evaluate the application these materials for the treatment of the Carapicuíba lake’s water.
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