Arsenic Geochemistry of Acid Mine Drainage

Paikaray, Susanta

doi:10.1007/s10230-014-0286-4

Cited by 60 publications

(28 citation statements)

References 81 publications

(123 reference statements)

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“…Arsenic is ubiquitous in acid mine drainage (AMD) (Williams, 2001;Paikaray, 2015) and 51 represents a severe threat for freshwater resources downstream from mining sites. It is 52 therefore essential to develop treatment processes able to remove arsenic from mine waters.…”

Section: Introduction 50mentioning

confidence: 99%

“…Alternatively, biological oxidation of iron and arsenic occurs naturally in AMD and has been 62 observed at various mining sites worldwide (Casiot et al, 2003;Asta et al, 2010b;Egal et al, 63 2010;Chen and Jiang, 2012;Paikaray, 2015). Bacteria involved in iron and arsenic oxidation 64 have been isolated and their metabolic capacities investigated (Battaglia-Brunet et al 2002, 65 Bruneel et al, 2003.…”

Section: Introduction 50mentioning

confidence: 99%

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Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD)

et al. 2017

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Passive water treatments based on biological attenuation can be effective for arsenic-rich acid mine drainage (AMD). However, the key factors driving the biological processes involved in this attenuation are not well-known. Here, the efficiency of arsenic (As) removal was investigated in a bench-scale continuous flow channel bioreactor treating As-rich AMD (∼30-40 mg L). In this bioreactor, As removal proceeds via the formation of biogenic precipitates consisting of iron- and arsenic-rich mineral phases encrusting a microbial biofilm. Ferrous iron (Fe(II)) oxidation and iron (Fe) and arsenic removal rates were monitored at two different water heights (4 and 25 mm) and with/without forced aeration. A maximum of 80% As removal was achieved within 500 min at the lowest water height. This operating condition promoted intense Fe(II) microbial oxidation and subsequent precipitation of As-bearing schwertmannite and amorphous ferric arsenate. Higher water height slowed down Fe(II) oxidation, Fe precipitation and As removal, in relation with limited oxygen transfer through the water column. The lower oxygen transfer at higher water height could be partly counteracted by aeration. The presence of an iridescent floating film that developed at the water surface was found to limit oxygen transfer to the water column and delayed Fe(II) oxidation, but did not affect As removal. The bacterial community structure in the biogenic precipitates in the bottom of the bioreactor differed from that of the inlet water and was influenced to some extent by water height and aeration. Although potential for microbial mediated As oxidation was revealed by the detection of aioA genes, removal of Fe and As was mainly attributable to microbial Fe oxidation activity. Increasing the proportion of dissolved As(V) in the inlet water improved As removal and favoured the formation of amorphous ferric arsenate over As-sorbed schwertmannite. This study proved the ability of this bioreactor-system to treat extreme As concentrations and may serve in the design of future in-situ bioremediation system able to treat As-rich AMD.

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Section: Introduction 50mentioning

confidence: 99%

Section: Introduction 50mentioning

confidence: 99%

Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD)

et al. 2017

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“…The release of As into the environment due to anthropogenic activities also contributes to high As concentrations. Mining activity exposes reduced As-minerals to the environment that will undergo weathering (with As concentrations in acid rock drainage of up to 11.3 mM (Paikaray 2015)). As-product manufacturing will also contribute to contamination of soil and water bodies, i.e.…”

Section: Introductionmentioning

confidence: 99%

Adaptation of a Methanogenic Consortium to Arsenite Inhibition

Rodríguez-Freire

Moore

Sierra-Álvarez

et al. 2015

Water Air Soil Pollut

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Arsenic (As) is a ubiquitous metalloid known for its adverse effects to human health. Microorganisms are also impacted by As toxicity, including methanogenic archaea, which can affect the performance of process in which biological activity is required (i.e. stabilization of activated sludge in wastewater treatment plants). The novel ability of a mixed methanogenic granular sludge consortium to adapt to the inhibitory effect of arsenic (As) was investigated by exposing the culture to approximately 0.92 mM of AsIII for 160 d in an arsenate (AsV) reducing bioreactor using ethanol as the electron donor. The results of shaken batch bioassays indicated that the original, unexposed sludge was severely inhibited by arsenite (AsIII) as evidenced by the low 50% inhibition concentrations (IC50) determined, i.e., 19 and 90 μM for acetoclastic- and hydrogenotrophic methanogenesis, respectively. The tolerance of the acetoclastic and hydrogenotrophic methanogens in the sludge to AsIII increased 47-fold (IC50 = 910 μM) and 12-fold (IC50= 1100 μM), respectively, upon long-term exposure to As. In conclusion, the methanogenic community in the granular sludge demonstrated a considerable ability to adapt to the severe inhibitory effects of As after a prolonged exposure period.

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“…In addition, release of elements from contaminated sediment is effected by environmental conditions such as pH, phosphate, redox conditions, and time (Rubinos et al 2011;Molinari et al 2014;Dang et al 2014). Although there are many studies about As mobilization and release from soils or sediments in mining areas (Paikaray 2015;Macgregor et al 2015;Desbarats et al 2015), quantitative information regarding the leaching of As in stream sediment in mining areas, particularly under hydrodynamic conditions, is rare.…”

Section: Introductionmentioning

confidence: 99%

“…It has been estimated that as many as 60-100 million people globally may be at risk of exposure to excessive levels of As (Ng et al 2003). With the rapid development of the mining and smelting industry, elevated concentrations of As in natural waters, soils, and sediments associated with mine water, beneficiation wastewater, and mine tailings (Paikaray 2015;Desbarats et al 2015). Gaur et al (2005) found that As discharged into the stream water can precipitate and accumulate onto stream sediment and eventually enter the food chain.…”

Section: Introductionmentioning

confidence: 99%

Arsenic speciation and kinetic release simulation of stream sediment contaminated by gold mining

Cai

et al. 2015

J Soils Sediments

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Purpose Understanding the mechanisms and kinetics controlling the release of metals from sediment is a prerequisite for evaluating the risk of sediment contaminated by toxic elements. The objectives of this research were to determine the leaching properties of arsenic (As) from stream sediment contaminated by gold mining and to quantify the kinetic rate of As release using a leaching experiment and numerical modeling. Materials and methods In this study, we collected surface stream sediment from Jiehe River which was contaminated by gold mining in Zhaoyuan, Shandong Province. Chemical speciation of As was analyzed by a modified three-step BCR sequential extraction procedure. The sediment microscopic morphological characteristics and elemental composition on the surface of the sediment were analyzed by scanning electron microscope-energy dispersive spectrometer (SEM-EDS). Release kinetics of As were studied by a simulated leaching experiment using a stirred-flow reactor and a two-site equilibrium-kinetic model. Results and discussion The sediments we studied were significantly contaminated by As, with maximum concentrations of 777.8-3389 mg/kg. Sequential extraction analysis suggested that As contents in weak acid extractable, oxidizable, reducible, and residual forms were 2.6-9.8, 18-79, 2.4-7.1, and 8.7-75 %, respectively. SEM-EDS analysis showed that As on the surface of the sediment was higher than its overall content in all four sediments especially sediment JH27, which has high content of TOC, indicating that abundant As was sorbed or precipitated on the sediment surface. Our two-site equilibrium-kinetic model fits the As release data well and can reproduce the stop-flow experimental results. Kinetic rates obtained from curve fitting showed large variation among sediments for As, indicating different reaction mechanisms. Conclusions The release of As from stream sediment contaminated by gold mining was nonequilibrium and timedependent and might cause long-term pollution to river water. Our two-site model was demonstrated as an effective tool to describe the kinetic release of As from stream sediment to waters.

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Arsenic Geochemistry of Acid Mine Drainage

Cited by 60 publications

References 81 publications

Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD)

Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD)

Adaptation of a Methanogenic Consortium to Arsenite Inhibition

Arsenic speciation and kinetic release simulation of stream sediment contaminated by gold mining

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