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2016-08-02 - Colloque/Présentation - poster - Français - 2 page(s)

Bakouan Corneille, Hantson Anne-Lise , Guel Boubié, "Adsorption de l’arsenic III et V sur les latérites naturelles locales (Burkina Faso)" in Société Ouest Africain de Chimie (SOACHIM), Cotonou, Benin, 2016

  • Codes CREF : Chimie des eaux (DI1333), Environnement et pollution (DI3840)
  • Unités de recherche UMONS : Génie des Procédés chimiques et biochimiques (F505)
  • Instituts UMONS : Institut des Sciences et du Management des Risques (Risques)

Abstract(s) :

(Anglais) Abstract The toxicity and the cancerogenicity of arsenic for human health are well established. At the present time, the arsenic diseases affect several millions of people throughout the world [1]. The consumption of groundwater contaminated by arsenic occurs in different parts of the world, including Burkina Faso, India, Vietnam, Argentina, Bangladesh etc. As an ubiquitous pollutant, arsenic is a threat to human being because every year millions of people around the world are victims of the toxic effects of this toxin [2]. Since the international standard for arsenic in drinking water recommended by the World Health Organization (WHO) is 10 µg / L, the removal of pollutant must be performed following appropriate methods, such as adsorption on the surface of laterites. The study carried out consisted in the use of the laterites of Burkina Faso for the potabilisation of groundwater contaminated by arsenic. The use of the raw lateritic materials as adsorbent is of great interest, which is justified by the importance of their large specific surface, by the presence of charges on their surface, by the possibility of exchange of cations, by their wide availability in the nature. Consequently, its use as adsorbent for arsenic removal seems very promising for developing countries such as Burkina Faso, because this technique requires few investments and the possibility of exploitation at low energy cost. During this study, batch adsorption test (effect of adsorbent dose tests, effect of initial arsenic concentration and effect of pH) were carried out in order to determine the rate of elimination of arsenic (V) and (III) and the quantity of arsenic (III) and (V) fixed per gram of adsorbent. During this study, the laterites of Burkina Faso have shown potential application for the adsorption of arsenic (III) and (V). For As (V) removal, maximum removal efficiency achieved is 99% at an adsorbent dose of 15 g/L for both KN and LA samples, whereas for As (III) removal it is 80% and 98% for LA and KN samples respectively. The low energy cost and the availability of materials are the principal advantages of this study which aims at supporting the populations in the northern part of Burkina Faso regarding the access to drinking water. Key words: Adsorption; laterite; arsenic; Burkina Faso