The impact of microbial sulfate-reduction on subsurface arsenic mobility

2012 ◽  
pp. 79-80
Keyword(s):  
Sulfate Reduction ◽  
Arsenic Mobility ◽  
Microbial Sulfate Reduction ◽  
The Impact

Microbial Sulfate Reduction Enhances Arsenic Mobility Downstream of Zerovalent-Iron-Based Permeable Reactive Barrier

2016 ◽  
Vol 50 (14) ◽  
pp. 7610-7617 ◽  
Author(s):  
Naresh Kumar ◽  
Raoul-Marie Couture ◽  
Romain Millot ◽  
Fabienne Battaglia-Brunet ◽  
Jérôme Rose
Keyword(s):  
Sulfate Reduction ◽  
Permeable Reactive Barrier ◽  
Zerovalent Iron ◽  
Arsenic Mobility ◽  
Reactive Barrier ◽  
Microbial Sulfate Reduction ◽  
Iron Based

Arsenic Mobility during Flooding of Contaminated Soil: The Effect of Microbial Sulfate Reduction

2014 ◽  
Vol 48 (23) ◽  
pp. 13660-13667 ◽  
Author(s):  
Edward D. Burton ◽  
Scott G. Johnston ◽  
Benjamin D. Kocar
Keyword(s):  
Sulfate Reduction ◽  
Contaminated Soil ◽  
Arsenic Mobility ◽  
Microbial Sulfate Reduction

Sediment diagenesis and porewater solute fluxes in acidic mine lakes: the impact of dissolved organic carbon additions

2009 ◽  
Vol 60 (7) ◽  
pp. 660 ◽  
Author(s):  
Deborah J. Read ◽  
Carolyn E. Oldham ◽  
Tiina Myllymäki ◽  
Matthias Koschorreck
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Sulfate Reduction ◽  
Anaerobic Respiration ◽  
Organic Substrates ◽  
Microbial Sulfate Reduction ◽  
Solute Fluxes ◽  
Sediment Diagenesis ◽  
Sulfide Production ◽  
The Impact

Sediment diagenesis through microbial sulfate reduction is considered a critical process in the pH amelioration of acidic mine lakes, but is often limited by the availability of organic carbon. Organic substrates are therefore frequently added to mine lake sediments to stimulate sulfate reduction. Dissolved organic carbon (DOC) was added to sediment collected from three mine lakes, one (in Germany) with typically high concentrations of Fe and SO4 and another two (in Australia) with unusually low concentrations of Fe and SO4. After the DOC additions caused the dissolved oxygen concentrations in the overlying waters to fall below 50 μmol L–1, the sediment porewater at all sites progressed through the expected anaerobic respiration sequence. The paucity of Fe and SO4 in the Australian lakes did not appear to constrain microbial iron and sulfate reduction. Indeed, the low Fe concentrations appeared to promote microbial sulfate reduction in the Australian sites. In the German site, there was little evidence of sulfide production in the porewater and no changes in porewater pH profiles. In contrast, the sediment porewater from the two Australian sites exhibited sulfide production and increased porewater pH. Bioremediation of acidic lakes must consider the need to treat iron-rich water before attempting pH amelioration.

scholarly journals Arsenic binding to organic and inorganic sulfur species during microbial sulfate reduction: a sediment flow-through reactor experiment

2013 ◽  
Vol 10 (4) ◽  
pp. 285 ◽  
Author(s):  
Raoul-Marie Couture ◽  
Dirk Wallschläger ◽  
Jérôme Rose ◽  
Philippe Van Cappellen
Keyword(s):  
Organic Matter ◽  
Sulfate Reduction ◽  
Iron Concentration ◽  
Labile Organic Matter ◽  
Sulfur Species ◽  
Sulfate Reducing ◽  
Arsenic Mobility ◽  
Microbial Sulfate Reduction ◽  
Reducing Conditions ◽  
Flow Through

Environmental context The use of water contaminated with arsenic for drinking and irrigation is linked to water and food borne diseases throughout the world. Although reducing conditions in soils and sediments are generally viewed as enhancing arsenic mobility in subsurface environments, we show they can actually promote As sequestration in the presence of reduced sulfur species and labile organic matter. We propose that sulfurisation of organic matter and subsequent binding of As to thiol groups may offer an innovative pathway for As remediation. Abstract Flow-through reactors (FTRs) were used to assess the mobility of arsenic under sulfate reducing conditions in natural, undisturbed lake sediments. The sediment slices in the FTRs were supplied continuously with inflow solutions containing sulfate and soluble AsIII or AsV and, after 3 weeks, also lactate. The experiment ran for a total of 8 weeks. The dissolved iron concentration, pH, redox potential (Eh), as well as aqueous As and sulfur speciation were monitored in the outflow solutions. In FTRs containing surface sediment enriched in labile organic matter (OM), microbial sulfate reduction led to an accumulation of organically bound S, as evidenced by X-ray absorption spectroscopy. For these FTRs, the inflowing dissolved As concentration of 20μM was lowered by two orders of magnitude, producing outflow concentrations of 0.2μM monothioarsenate and 0.1μM arsenite. In FTRs containing sediment collected at greater depth, sulfide and zero-valent S precipitated as pyrite and elemental S, while steady-state outflow arsenite concentrations remained near 5μM. The observations thus suggest that As sequestration is enhanced when sediment OM buffers the free sulfide and zero-valent S concentrations. An updated conceptual model for the fate of As in the anoxic As–C–S–Fe system is presented based on the results of this study.

STIMULATING MICROBIAL SULFATE REDUCTION TO LOWER ARSENIC CONCENTRATION IN GROUNDWATER

2016 ◽  
Author(s):  
Ben R. Haller ◽  
◽  
Janet M. Paper ◽  
Michael Vega ◽  
Saugata Datta ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Arsenic Concentration ◽  
Microbial Sulfate Reduction

scholarly journals Characterizing the distribution and rates of microbial sulfate reduction at Middle Valley hydrothermal vents

2013 ◽  
Vol 7 (7) ◽  
pp. 1391-1401 ◽  
Author(s):  
Kiana L Frank ◽  
Daniel R Rogers ◽  
Heather C Olins ◽  
Charles Vidoudez ◽  
Peter R Girguis
Keyword(s):  
Sulfate Reduction ◽  
Hydrothermal Vents ◽  
Microbial Sulfate Reduction
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