7.  Studies on Adsorption in Column of As(III) from Water on Iron containing Materials

Authors: A. Negrea, L. Lupa, C. Muntean, M. Ciopec, P. Negrea and R. Istratie


Abstract:

Arsenic contamination of surface and underground waters is reported in many parts of the world and is considered a global issue. High doses of arsenic are known to be toxic to humans, but chronic long-term exposure to inorganic arsenic can also be detrimental to health. Therefore, the development of removal methods for inorganic arsenic from drinking water and underground water is very important and urgent.The paper presents studies on the possibilities of removal of arsenic from water using columns filled with an adsorbent material containing iron (MAF). The iron containing adsorbent material is a by-product resulting during the neutralization with lime of wastewaters from hot dip galvanization. The column was filled with a mixture of MAF and sand in different proportions (MAF: sand = 1:1, 3:1, 1:3). To establish the maximum adsorption capacity and the optimal MAF: sand ratio, it was determined the dependence of arsenic residual concentration and arsenic removal degree on the volume of solution passed through the column and on the contact time.The maximum arsenic adsorption capacity was obtained for a MAF: sand ratio of 1:1. For a 3:1 ratio, the adsorption process occurs in good conditions, but the column was clogged after a short time.In order to express the kinetics of arsenic adsorption in column onto MAF: sand mixture, the results were analyzed using the logit kinetic model.


Keywords: arsenic, adsorption, water

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