Natural attenuation process via microbial oxidation of arsenic in a high Andean watershed

Leiva, Eduardo; Rámila, Consuelo d. P.; Vargas, Ignacio T.; Escauriaza, Cristián; Bonilla, Carlos A.; Pizarro, Gonzalo; Regan, John J.; Pastén, Pablo

doi:10.1016/j.scitotenv.2013.07.009

Cited by 50 publications

(31 citation statements)

References 83 publications

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“…The key biologic component of the system was an acidophilic anaerobic indigenous consortium obtained from acid drainage, collected from an abandoned sulfur mine in northern Chile [13]. This approach has been recently reported to facilitate the recovery and recycling of copper present in pregnant leach solution (PLS) from mine tailings, allowing for the recovery of a "clean" mineral product [19,20].…”

Section: Discussionmentioning

confidence: 99%

“…The bioreactor housed sulfidogenic bacteria obtained from an anaerobic sediment found in an acidic river located in northern Chile [13]. The mixed population was immobilized on 1-2 mm diameter porous beads made from recycled glass (Poraver Dennert GmbH, Schlüsselfeld, Germany), which occupied~50% of the total volume of the bioreactor.…”

Section: Sulfidogenic Bioreactormentioning

confidence: 99%

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Synthesis of Copper Sulfide Nanoparticles Using Biogenic H2S Produced by a Low-pH Sulfidogenic Bioreactor

et al. 2018

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Abstract:The application of acidophilic sulfate-reducing bacteria (SRB) for the treatment of acidic mine water has been recently developed to integrate mine water remediation and selective biomineralization. The use of biogenic hydrogen sulfide (H 2 S) produced from the dissimilatory reduction of sulfate to fabricate valuable products such as metallic sulfide nanoparticles has potential applications in green chemistry. Here we report on the operation of a low-pH sulfidogenic bioreactor, inoculated with an anaerobic sediment obtained from an acid river in northern Chile, to recover copper via the production of copper sulfide nanoparticles using biogenic H 2 S. The laboratory-scale system was operated as a continuous flow mode for up to 100 days and the bioreactor pH was maintained by the automatic addition of a pH 2.2 influent liquor to compensate for protons consumed by biosulfidogenesis. The "clean" copper sulfide nanoparticles, produced in a two-step process using bacterially generated sulfide, were examined using transmission electron microscopy, dynamic light scattering, energy dispersive (X-ray) spectroscopy and UV-Vis spectroscopy. The results demonstrated a uniform nanoparticle size distribution with an average diameter of less than 50 nm. Overall, we demonstrated the production of biogenic H 2 S using a system designed for the treatment of acid mine water that holds potential for large-scale abiotic synthesis of copper sulfide nanoparticles.

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Section: Discussionmentioning

confidence: 99%

Section: Sulfidogenic Bioreactormentioning

confidence: 99%

Synthesis of Copper Sulfide Nanoparticles Using Biogenic H2S Produced by a Low-pH Sulfidogenic Bioreactor

et al. 2018

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“…MFC were initially operated as batch reactors in a controlled-temperature room (~20 °C). The reactors were inoculated with an enrichment culture from an AMD-affected sediment, located in the upper section of the Azufre River sub-basin, Northern Chile [24]. Acidic synthetic water, with pyruvate as electron donor, was used as the electrolyte during MFC operation.…”

Section: Single-chamber Mfc Start-up and Operationmentioning

confidence: 99%

Acid Water Neutralization Using Microbial Fuel Cells: An Alternative for Acid Mine Drainage Treatment

Leiva

Leiva-Aravena

Vargas

2016

Water

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Acid mine drainage (AMD) is a complex environmental problem, which has adverse effects on surface and ground waters due to low pH, high toxic metals, and dissolved salts. New bioremediation approach based on microbial fuel cells (MFC) can be a novel and sustainable alternative for AMD treatment. We studied the potential of MFC for acidic synthetic water treatment through pH neutralization in batch-mode and continuous-flow operation. We observed a marked pH increase, from~3.7 to~7.9 under batch conditions and to~5.8 under continuous-flow operation. Likewise, batch reactors (non-MFC) inoculated with different MFC-enriched biofilms showed a very similar pH increase, suggesting that the neutralization observed for batch operation was due to a synergistic influence of these communities. These preliminary results support the idea of using MFC technologies for AMD remediation, which could help to reduce costs associated with conventional technologies. Advances in this configuration could even be extrapolated to the recovery of heavy metals by precipitation or adsorption processes due to the acid neutralization.

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“…5 High EC and arsenic (As) values are due, in part, to high levels of dissolved heavy metals, metalloids and sulfate discharged into surface waters in the upper sections of the valley. 6 The elevated levels of these contaminants reduce the agricultural productivity and variety of species can be cultivated within the valley. 7,8 Agricultural products obtained are of great importance for the consumption of e-mail scopaja@uchile.cl the inhabitants of the area.…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Concentration in Sediment of Lluta River Basin

Copaja

Muñoz

2018

J. Chil. Chem. Soc.

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Northern Chile is characterized by water scarcity. The Lluta River, located in the XV region of Arica and Parinacota, is the one of the main rivers in northern Chile. The elevated levels of metals and metaloids in the river reduce the agricultural productivity and variety of species can be cultivated within the valley, which are of great importance for the consumption of the inhabitants of the area.Heavy metals in river bottoms may cause various effects on the water quality, as such the capacity to accumulate metals; levels of toxicity and metal stabilization in sediments have often been considered a pollution index of a territory.In this work the concentrations of Al, Cu, Fe, Mn, Mo, Pb and Zn from the pseudo-total and labile fraction of Lluta river sediments were studied. Samples from 10 sites along the river were collected. The sediments were characterized determining: pH, electrical conductivity, organic carbon (OC), organic total carbon (OTC), available phosphorus and boron. Heavy metals were analyzed by Atomic Absorption Spectroscopy (AAS).For the metals analyzed in the pseudo-total fraction, the highest concentrations found were: Al in the site 10, (17061 mg kg -1 ) and Fe on site 6, (29898 mg kg -1 ). For the labile fraction, highest concentrations of metals were: Al in site 6 (1079 mg kg ). Using the Risk assessment code (RAC), the site 6 presents the greatest risk with high values of Cu, Mn, Pb and Zn, followed by site 1 with high values of Mn, Cu and Zn, and site 9 with high values of Mn, Cu and Pb. On the other hand, the MacDonald PEC (probable effect concentration) and TEC (threshold effect concentration) toxicity criteria, showed that the sites 4 and 6 have levels above the TEC for Cu, Fe, Pb and Zn, and levels above the PEC at six sites for Mn.

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Natural attenuation process via microbial oxidation of arsenic in a high Andean watershed

Cited by 50 publications

References 83 publications

Synthesis of Copper Sulfide Nanoparticles Using Biogenic H2S Produced by a Low-pH Sulfidogenic Bioreactor

Synthesis of Copper Sulfide Nanoparticles Using Biogenic H2S Produced by a Low-pH Sulfidogenic Bioreactor

Acid Water Neutralization Using Microbial Fuel Cells: An Alternative for Acid Mine Drainage Treatment

Heavy Metals Concentration in Sediment of Lluta River Basin

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