Selenium reduction by a denitrifying consortium

Rege, Mahesh A.; Yonge, David R.; Mendoza, Donaldo P.; Petersen, James N.; Bereded-Samuel, Yared; Johnstone, Donald L.; Barnes, Joni M.

doi:10.1002/(sici)1097-0290(19990220)62:4<479::aid-bit11>3.0.co;2-g

Cited by 29 publications

(10 citation statements)

References 16 publications

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“…Of additional importance, S . maltophilia can reduce SeO 4 2− and SeO 3 2− under micro‐aerophilic conditions; in contrast, the majority of work on Se‐reducing bacteria has focused on organisms that require strict anaerobicity (Gerhardt et al ., 1991; Tomei et al ., 1992; Macy, 1994; Oremland et al ., 1994; 1995; Rege et al ., 1999). Because bioreactor influent will contain O 2 , the ability of S .…”

Section: Resultsmentioning

confidence: 99%

“…In the case of S. maltophilia, NO 3 should not interfere with the reduction of either Se oxyanion since the organism cannot respire NO 3 -(data not shown), but additional studies are scheduled to determine if the organism displays a negative physiological response to high NO 3 concentrations. Of additional importance, S. maltophilia can reduce SeO 4 2and SeO 3 2under microaerophilic conditions; in contrast, the majority of work on Se-reducing bacteria has focused on organisms that require strict anaerobicity (Gerhardt et al, 1991;Tomei et al, 1992;Macy, 1994;Oremland et al, 1994;Rege et al, 1999). Because bioreactor influent will contain O 2 , the ability of S. maltophilia to grow in the presence of O 2 and rapidly reduce Se oxyanions in the presence of low levels of O 2 could be extremely advantageous.…”

Section: Reduction Of Selenate and Selenitementioning

confidence: 99%

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Transformations of selenate and selenite by Stenotrophomonas maltophilia isolated from a seleniferous agricultural drainage pond sediment

Dungan¹,

Yates²,

Frankenberger³

2003

Environmental Microbiology

123

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A Gram-negative bacterium, identified as Stenotrophomonas maltophilia by fatty acid analysis and 16S rRNA sequencing, was isolated from a seleniferous agricultural evaporation pond sediment collected in the Tulare Lake Drainage District, California. In cultures exposed to the atmosphere, the organism reduces selenate (SeO4(2-)) and selenite (SeO3(2-)) to red amorphous elemental selenium (Se degrees ) only upon reaching stationary phase, when O2 levels are less than 0.1 mg l(-1). In 48 h, S. maltophilia removed 81.2% and 99.8% of added SeO4(2-) and SeO3(2-) (initial concentration of 0.5 mM), respectively, from solution. Anaerobic growth experiments revealed that the organism was incapable of using SeO4(2-), SeO3(2-), SO4(2-) or NO3- as a terminal electron acceptor. Transmission electron microscopy of cultures spiked with either Se oxyanion were found to contain spherical extracellular deposits. Analysis of the deposits by energy-dispersive X-ray spectroscopy revealed that they consist of Se. Furthermore, S. maltophilia was active in producing volatile alkylselenides when in the presence of SeO4(2-) and SeO3(2-). The volatile products were positively identified as dimethyl selenide (DMSe), dimethyl selenenyl sulphide (DMSeS) and dimethyl diselenide (DMDSe) by gas chromatography-mass spectrometry. Our findings suggest that this bacterium may contribute to the biogeochemical cycling of Se in seleniferous evaporation pond sediments and waters. This organism may also be potentially useful in a bioremediation scheme designed to treat seleniferous agricultural wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Reduction Of Selenate and Selenitementioning

confidence: 99%

Transformations of selenate and selenite by Stenotrophomonas maltophilia isolated from a seleniferous agricultural drainage pond sediment

Dungan¹,

Yates²,

Frankenberger³

2003

Environmental Microbiology

123

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“…The SRB systems have been mostly used in the treatment of textile wastewater, thanks to their efficiency in removing dyes [69]. Further, this system has been employed for Se-laden wastewater treatment by Rege and coworkers, which used a denitrifying bacterial consortium for the reduction of both SeO 3 2− and SeO 4 2− with acetate as electron donor, observing a lag phase of 150 h and a SeO 3 2− reduction rate higher than SeO 4 2− [156]. In other studies, SBR reactors have been used for the remediation of SeO 4 2− specifically inoculating the bacterial strains Thauera selenatis [157] and Bacillus sp.…”

Section: The Sbr Systemmentioning

confidence: 99%

Microbial-Based Bioremediation of Selenium and Tellurium Compounds

Piacenza¹,

Presentato²,

Zonaro³

et al. 2018

Biosorption

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The chalcogens selenium (Se) and tellurium (Te) are rare earth elements, which are mainly present in the environment as toxic oxyanions, due to the anthropogenic activities. Thus, the increased presence of these chalcogen-species in the environment and the contamination of wastewaters nearby processing facilities led to the necessity in developing remediation strategies aimed to detoxify waters, soils and sediments. Among the different decontamination approaches, those based on the ability of microorganisms to bioaccumulate, biomethylate or bioconvert Se-and/or Te-oxyanions are considered the leading strategy for achieving a safe and eco-friendly bioremediation of polluted sites. Recently, several technologies based on the use of bacterial pure cultures, bacterial biofilms or microbial consortia grown in reactors with different configurations have been explored for Se-and Te-decontamination purposes. Further, the majority of microorganisms able to process chalcogen-oxyanions have been described to generate valuable Se-and/or Te-nanomaterials as end-products of their bioconversion, whose potential applications in biomedicine, optoelectronics and environmental engineering are still under investigation. Here, the occurrence, the use and the toxicity of Se-and Te-compounds will be briefly overviewed, while the microbial mechanisms of chalcogen-oxyanions bioprocessing, as well as the microbialbased strategies used for bioremediation approaches will be extensively described. Biosorption 132Biosorption 136Microbial-Based Bioremediation of Selenium and Tellurium Compounds

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“…Selenium also can be leached from soils, a particular problem in the Central Valley of California. Selenium can be reduced to selenite or to elemental selenium by bacteria that also use nitrate as an electron acceptor (Fujita et al, 1997;Rege et al, 1999a). For example, SeO 4 was removed concurrently with nitrate by a denitrifying consortia or pure cultures (Macy et al, 1993;Rege et al, 1999b;Kashiwa et al, 2000).…”

Section: Selenate/selenitementioning

confidence: 99%

Hydrogen-based, hollow-fiber membrane biofilm reactor for reduction of perchlorate and other oxidized contaminants

Nerenberg

Rittmann

2004

Water Science and Technology

144

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Many oxidized pollutants, such as nitrate, perchlorate, bromate, and chlorinated solvents, can be microbially reduced to less toxic or less soluble forms. For drinking water treatment, an electron donor must be added. Hydrogen is an ideal electron donor, as it is non-toxic, inexpensive, and sparsely soluble. We tested a hydrogen-based, hollow-fiber membrane biofilm reactor (MBfR) for reduction of perchlorate, bromate, chlorate, chlorite, chromate, selenate, selenite, and dichloromethane. The influent included 5 mg/L nitrate or 8 mg/L oxygen as a primary electron accepting substrate, plus 1 mg/L of the contaminant. The mixed-culture reactor was operated at a pH of 7 and with a 25 minute hydraulic detention time. High recirculation rates provided completely mixed conditions. The objective was to screen for the reduction of each contaminant. The tests were short-term, without allowing time for the reactor to adapt to the contaminants. Nitrate and oxygen were reduced by over 99 percent for all tests. Removals for the contaminants ranged from a minimum of 29% for chlorate to over 95% for bromate. Results show that the tested contaminants can be removed as secondary substrates in an MBfR, and that the MBfR may be suitable for treating these and other oxidized contaminants in drinking water.

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Selenium reduction by a denitrifying consortium

Cited by 29 publications

References 16 publications

Transformations of selenate and selenite by Stenotrophomonas maltophilia isolated from a seleniferous agricultural drainage pond sediment

Transformations of selenate and selenite by Stenotrophomonas maltophilia isolated from a seleniferous agricultural drainage pond sediment

Microbial-Based Bioremediation of Selenium and Tellurium Compounds

Hydrogen-based, hollow-fiber membrane biofilm reactor for reduction of perchlorate and other oxidized contaminants

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