Acid Drainage and Metal Bioleaching by Redox Potencial Changes in Heavy Polluted Fluvial Sediments

Porzionato, Natalia; Mellota, Mariangeles; Candal, Roberto; Curutchet, Gustavo

doi:10.4028/www.scientific.net/amr.825.496

Cited by 4 publications

(12 citation statements)

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“…As it was shown in previous works (Porzionato et al 2013(Porzionato et al , 2014(Porzionato et al , 2015Mellota 2015), the high content of organic matter in the sediments is mainly due to sewage discharges from neighbourhoods surrounding the channel and other close residential ones without sewer collection service. This high organic load trends to sediment very quickly and is incorporated to the sediments.…”

Section: Resultsmentioning

confidence: 68%

“…Although there are reports of the presence of other metals in this sediment, in this paper, Zn and Cu were selected because of their majority concentration and different characteristics of mobility and affinities for organic matter and sulphides (Porzionato et al 2013;Peng et al 2009). …”

Section: Resultsmentioning

confidence: 99%

“…The concentration of Cu and Zn was measured in each fraction by atomic absorption spectrophotometry (AAS). Acidification risk and metal release were determined in previous works (Porzionato et al 2013) according to the methodology formulated by Kersten and Förstner (1991).…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, such self-purification rate overcomes the normal degradation rate of organic matter due to the processes of sedimentation and the main process involved in selfpurification is the incorporation of organic matter (and other pollutants) into sediments. This fact leads to a high benthic oxygen demand generation and sets an anoxic environmental condition suitable for the biocatalyzed formation of sulphides (Di Nanno et al 2007;Porzionato et al 2013Porzionato et al , 2014. Under these low redox potential conditions, most of heavy metals might precipitate as poorly soluble sulphides and hydroxides or are adsorbed to the different mineral components of the sediment matrix (Eggleton and Thomas 2004;Atkinson et al 2007;Charriau et al 2011).…”

Section: Responsible Editor: Robert Duranmentioning

confidence: 97%

“…These processes have been intensively studied through static assays (Kersten and Förstner 1991) and dynamic experiments of anaerobic sediment oxidation systems by re-suspension or desiccation (Maddock et al 2007;Di Nanno et al 2007Cappuyns and Swennen 2011;Ye et al 2013;Porzionato et al 2013Porzionato et al , 2014.…”

Section: Responsible Editor: Robert Duranmentioning

confidence: 99%

See 4 more Smart Citations

Metal bioleaching from anaerobic sediments from Reconquista River basin (Argentina) as a potential remediation strategy

Porzionato

Tufo

Candal

et al. 2016

Environ Sci Pollut Res

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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 of Zn and 117 mg kg 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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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Responsible Editor: Robert Duranmentioning

confidence: 97%

Section: Responsible Editor: Robert Duranmentioning

confidence: 99%

See 3 more Smart Citations

Metal bioleaching from anaerobic sediments from Reconquista River basin (Argentina) as a potential remediation strategy

Porzionato

Tufo

Candal

et al. 2016

Environ Sci Pollut Res

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Effects of pollution and bioleaching process on the mineral composition and texture of contaminated sediments of the Reconquista River, Argentina

Tufo

Porzionato

Curutchet

2017

Environ Sci Pollut Res

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In this work, we report on the structural and textural changes in fluvial sediments from Reconquista River´s basin, Argentina, due to processes of contamination with organic matter and remediation by bioleaching. The original uncontaminated matrix showed quartz and phyllosilicates as the main primary mineral constituents and phases of interstratified illite-montmorillonite as secondary minerals. It was found that in contaminated sediments, the presence of organic matter in high concentration causes changes in the specific surface area, particle size distribution, size and distribution of micro and meso, and the morphology of the particles with respect to the uncontaminated sediment. After the bioleaching process, there were even greater changes in these parameters at the level of secondary mineral formation and the appearance of nanoparticles, which were confirmed by SEM. Especially, we found the formation of cementing substances such as gypsum, promoting the formation of macroporous aggregates and the weathering of clay components. Our results indicate that the bioleaching not only decreases the content of metals but also favors the formation of a material with improved characteristics for potential future applications.

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Wiring Up Along Electrodes for Biofilm Formation

et al. 2021

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Millimeter-length cables of bacteria were discovered growing along a graphite-rod electrode serving as an anode of a microbial electrolysis cell (MEC). The MEC had been inoculated with a culture of Fe-reducing microorganisms enriched from a polluted river sediment (Reconquista river, Argentina) and was operated at laboratory controlled conditions for 18 days at an anode poised potential of 240 mV (vs. Ag/AgCl), followed by 23 days at 480 mV (vs. Ag/AgCl). Anode samples were collected for scanning electron microscopy, phylogenetic and electrochemical analyses. The cables were composed of a succession of bacteria covered by a membranous sheath and were distinct from the known “cable-bacteria” (family Desulfobulbaceae). Apparently, the formation of the cables began with the interaction of the cells via nanotubes mostly located at the cell poles. The cables seemed to be further widened by the fusion between them. 16S rRNA gene sequence analysis confirmed the presence of a microbial community composed of six genera, including Shewanella, a well-characterized electrogenic bacteria. The formation of the cables might be a way of colonizing a polarized surface, as determined by the observation of electrodes extracted at different times of MEC operation. Since the cables of bacteria were distinct from any previously described, the results suggest that bacteria capable of forming cables are more diverse in nature than already thought. This diversity might render different electrical properties that could be exploited for various applications.

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Acid Drainage and Metal Bioleaching by Redox Potencial Changes in Heavy Polluted Fluvial Sediments

Cited by 4 publications

References 5 publications

Metal bioleaching from anaerobic sediments from Reconquista River basin (Argentina) as a potential remediation strategy

Metal bioleaching from anaerobic sediments from Reconquista River basin (Argentina) as a potential remediation strategy

Effects of pollution and bioleaching process on the mineral composition and texture of contaminated sediments of the Reconquista River, Argentina

Wiring Up Along Electrodes for Biofilm Formation

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