Intensification of Arsenic and Zinc Mobilization by Combination of Bio-Chemical Leaching with EDTA in the Soil and Sediment Bioremediation

Abstract:

The use of chemical pretreatment with 10mM EDTA to enhance the arsenic microbial mobilization was evaluated in this study. The bioleaching involved the use of the indigenous sedimentary and soil heterotrophic microorganisms, whose leaching media contained 2mM EDTA. The main objectives of using the chemical pretreatment was the removal of metal surface coatings from the iron minerals, such as Cu and Zn, which inhibited the iron microbial dissolution in the soil and sediment environment and thus increasing the mobilization of the retained As. To examine the effect of the chemical pretreatment and the biological leaching on the mobilization of Cu, Zn, and As, batch and column tests were conducted within the laboratory experiments. The removal of As and Zn from the soil and sediment was greatly enhanced by the co-treatment in the batch solution conditions than in the column percolate conditions and had negative effect only for Cu. In the batch tests, the heterotrophic bioleaching of the soil and sediment was found to have a pronounced positive effect on the extraction of As and Zn.

• Periodical: Solid State Phenomena (Volume 262)
• Pages: 634-637
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.262.634
• Online since: August 2017
• Authors: Iveta Štyriaková*, Darina Štyriaková, Alexandra Bekényiová, Jaroslav Šuba
• Keywords: Arsenic, Bioleaching, EDTA, Sediment, Soil

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