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Removal of inorganic As5+ from a small drinking water system

Abstract

The drinking water from a small drinking water system contained arsenic in a concentration of about 50 ▫mumu▫g/L. Chemical analyses showed that the pentavalent form of arsenic was present. Since the MCL value is 10 ▫mumu▫g/L, it was necessary to implement a technological treatment to make the water suitable for drinking. In order to do so, two technologies were suggested: activated alumina and ▫alphaalpha▫-FeOOH (TehnoArz, TA) adsorption media. Experiments using both adsorption media were performed on a laboratory scale. It was possible to remove arsenic to below 1 ▫mumu▫g/L. The maximal adsorption capacity was found to be 12.7 mg of As5+ per gram of ▫alphaalpha▫-FeOOH. Moreover, all the important physico- chemical parameters of the water remained practically unchanged after the treatment. Only a slight release of iron from the media was observed. The Fe-As bond was studied by means of chemical analysis and X-ray powder diffraction. Finally, in addition to showing the capability of arsenic removalby ▫alphaalpha▫-FeOOH, a comprehensive optimization of the technological parameters of the selected technology is provided

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Digital library of University of Maribor

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oaioai:dk.um.si:IzpisGradiva.php?id=27353Last time updated on 11/18/2016View original full text link

This paper was published in Digital library of University of Maribor.

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