Abstract
Anaerobic sediments of urban watercourses are subjected to industrial pollution and frequently tend to accumulate heavy metals. The biocatalyzed oxidation and reduction of sulphur compounds that occur within the sediment are key reactions that determine mobility of metals such as that occurred in mine acidic drainage reactions. The aim of this work was to study the application of these processes using heap leaching technology for the remediation of anaerobic contaminated sediments from Reconquista River basin. The bioleaching potentiality for remediation was demonstrated through batch tests in shake flasks with different pulp densities of anaerobic sediment containing 338 mg kg−1 of Zn and 117 mg kg−1 of Cu. Subsequently, bioleaching heap systems were compiled into columns of 12-cm height and 6-cm diameter, fitted with perlite to improve drainage. In order to assess the effect of elementary sulphur over the mobility of metals from the bioheap to the aqueous solution, increasing concentrations of elementary sulphur (1, 2, 5 % w/w) were added. After 3 months of acidification generated by periodic watering, the extraction of 70 % of the initial Zn and 43 % of the initial Cu was achieved. Polluted sediments from waterways as Reconquista River should not be indiscriminately manipulated if acid drainage is possible. Remediation by a simple and economically viable strategy like heap leaching is feasible.
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Acknowledgments
The authors acknowledge Consejo Nacional de Investigaciones Científicas y Técnicas and Fundación YPF (PIO13320130100203CO) and Universidad Nacional de San Martín (Diálogo entre las Ciencias) for the financial support. NP and AT acknowledge fellowship from CONICET. RC and GC are researchers of CONICET. They are also thankful to N. Morandeira for her contribution in the analyses of satellite data and edition of the image.
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Porzionato, N., Tufo, A., Candal, R. et al. Metal bioleaching from anaerobic sediments from Reconquista River basin (Argentina) as a potential remediation strategy. Environ Sci Pollut Res 24, 25561–25570 (2017). https://doi.org/10.1007/s11356-016-6717-y
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DOI: https://doi.org/10.1007/s11356-016-6717-y