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1.
Removal of inorganic As [sup] 5+ from a small drinking water system
Marjana Simonič, 2009, izvirni znanstveni članek

Opis: The drinking water from a small drinking water system contained arsenic in a concentration of about 50 ▫$mu$▫g/L. Chemical analyses showed that the pentavalent form of arsenic was present. Since the MCL value is 10 ▫$mu$▫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 ▫$alpha$▫-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 ▫$mu$▫g/L. The maximal adsorption capacity was found to be 12.7 mg of As5+ per gram of ▫$alpha$▫-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 ▫$alpha$▫-FeOOH, a comprehensive optimization of the technological parameters of the selected technology is provided.
Ključne besede: drinking water, arsenic, activated alumina, goethite, adsorption
Objavljeno: 01.06.2012; Ogledov: 987; Prenosov: 23
URL Povezava na celotno besedilo

2.
Removal of arsenic from drinking water
Marjana Simonič, 2007, izvirni znanstveni članek

Opis: The drinking water well in Slovenska Bistrica, Slovenia, contains arsenic in concentration around 50 ▫$/mu$▫g/L. Therefore it is necessary to implement a technological treatment to make the water suitable for drinking. In order to do so the following technologies were suggested: activated alumina, green sand, granular ferric hydroxide and special goethite media. They were all carried out on a laboratory scale. We managed to remove arsenic below 1 ▫$/mu$▫g/L. Arsenic is usually found as an anion with acid characteristics in the trivalent (III) and pentavalent (V) forms. Chemical analyses of our drinking water showed that arsenic is present in pentavalent form. This means that the water is less toxic as it would be if it contained arsenic in the trivalent form. On the other hand, all the important physical chemical parameters of water remained practically unchanged after the treatment. The hygienic water quality obtained was not an issue. Finally, in addition to capability of arsenic removal, a comprehensive economic analysis of selected technologies is provided.
Ključne besede: pitna voda, arzen, aktivna glinica, goetit, drinking water, arsenic, activated alumina, goethit
Objavljeno: 21.12.2015; Ogledov: 576; Prenosov: 17
URL Povezava na celotno besedilo

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