Mobilisation of arsenic from a mining soil in batch slurry experiments under bio-oxidative conditions

Water Research
R BayardR Gourdon

Abstract

Laboratory investigations were performed to estimate the potential mobility of arsenic (As) from a highly contaminated gold-mining soil under bio-oxidative aerobic conditions as a potential remediation process. The selected soil was sampled from a gold-mining site in the South of France. It contained 27700 mg kg(-1) total As, with only 0.01% present under water-soluble forms. The nature of the immobilization mechanisms was identified by using complementary physical and chemical techniques. As was found to be strongly associated to iron (oxy)hydroxide solid phase by adsorption and/or co-precipitation. Determination of iron (Fe) and As mobility as a function of pH showed that the release of As was related with the dissolution of Fe (oxy)hydroxide at very low pH values. Bioleaching experiments were conducted with the objective to enhance the mobilization of As from the source material via biological oxidation of elemental sulfur (S degree) into sulfuric acid by autotrophic exogenous or indigenous bacteria naturally located in the soil (i.e. Acidithiobacillus species). Tests conducted at 30 degrees C in shaker flasks supplemented with S degree resulted in very acidic (pH < 1) and oxidative conditions (oxidation/reduction potential ...Continue Reading

References

Jan 1, 1986·Annual Review of Microbiology·S R HutchinsC L Brierley
Feb 28, 2001·Fresenius' Journal of Analytical Chemistry·M ChausseauJ M Mermet
Jun 10, 2005·Journal of Hazardous Materials·Vincent ChatainRémy Gourdon

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Citations

May 5, 2009·Environmental Geochemistry and Health·Keun-Young LeeSoon-Oh Kim
Nov 11, 2010·Environmental Geochemistry and Health·Jung-Wook Kim, Myung Chae Jung
Apr 21, 2012·Environmental Microbiology·Raoul-Marie CoutureAntoine Danchin
Nov 18, 2014·Environmental Science and Pollution Research International·Christophe Waterlot, Francis Douay

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