Seasonal variations in nitrogen-fixation (acetylene reduction) and sulphate-reduction rates in the rhizosphere of Zostera noltii: nitrogen fixation by sulphate-reducing bacteria

Several strains of Gram-negative and Gram-positive sulphate-reducing bacteria (SRB) are able to use carbon monoxide (CO) as a carbon source and electron donor for biological sulphate reduction. These strains exhibit variable resistance to CO toxicity. The most resistant SRB can grow and use CO as an electron donor at concentrations up to 100%, whereas others are already severely inhibited at CO concentrations as low as 1-2%. Here, the utilization, inhibition characteristics, and enzymology of CO metabolism as well as the current state of genomics of CO-oxidizing SRB are reviewed. Carboxydotrophic sulphate-reducing bacteria can be applied for biological sulphate reduction with synthesis gas (a mixture of hydrogen and carbon monoxide) as an electron donor.

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Rare Earth Elements Recovery and Sulphate Removal from Phosphogypsum Waste Waters with Sulphate Reducing Bacteria

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.262.573 ◽

2017 ◽

Vol 262 ◽

pp. 573-576 ◽

Cited By ~ 4

Author(s):

Jarno Mäkinen ◽

Malin Bomberg ◽

Marja Salo ◽

Mona Arnold ◽

Pertti Koukkari

Keyword(s):

Rare Earth ◽

Phosphoric Acid ◽

Rare Earth Elements ◽

Acid Production ◽

Sulphate Reduction ◽

Anaerobic Sludge ◽

Seepage Water ◽

Sulphate Reducing Bacteria ◽

Reducing Bacteria ◽

Phosphogypsum Waste

Phosphogypsum waste, originating from phosphoric acid production from apatite ores, is well known for its high production rate and possible release of sulphate-rich seepage waters. In addition to negative environmental impacts, phosphogypsum waste heaps are also remarkable secondary sources of Rare Earth Elements (REE); in the phosphoric acid production process a majority of REE, occurring in apatite, are precipitated to the phosphogypsum waste. Therefore, a method treating both sulphate-rich waters and recovering REE from phosphogypsum heaps and seepage waters would offer both economic and environmental benefits. In this ongoing study, seepage waters from a phosphogypsum heap are treated with Sulphate Reducing Bacteria (SRB) and ethanol as a substrate. Sulphate is first reduced to hydrogen sulphide, which then precipitates REE as sulphides. The main challenge, low concentration of REE in seepage waters (e.g. 2.87 μg/l La, 5.13 μg/l Ce, 0.67 μg/l Y and 3.32 μg/l Nd), is overcome by utilizing continuous mode, semi-passive and cost effective column apparatus, requiring no agitation and performing both sulphate reduction and REE recovery in a single reactor. The SRB method results in a sulphate reduction rate of 40-80 % (from app. 1400 mg/l to 276-844 mg/l sulphate in the effluent) and efficient REE recovery from seepage water. The concentrate obtained from the column consists of a mixture of anaerobic sludge and precipitated REE, with respective REE concentrations of 202 mg/kg La, 477 mg/kg Ce, 49 mg/kg Y and 295 mg/kg Nd.

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Sulphate reduction and zinc precipitation from wastewater by sulphate-reducing bacteria in an anaerobic moving-liquid/static-bed bioreactor

Desalination and Water Treatment ◽

10.1080/19443994.2016.1153983 ◽

2016 ◽

Vol 57 (53) ◽

pp. 25617-25626 ◽

Cited By ~ 2

Author(s):

Hakimeh Teiri ◽

Mohsen Rezaei ◽

Shahrokh Nazmara ◽

Yaghoub Hajizadeh

Keyword(s):

Sulphate Reduction ◽

Sulphate Reducing Bacteria ◽

Reducing Bacteria ◽

Moving Liquid

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Nitrogen Fixation by Sulphate-reducing Bacteria

Journal of General Microbiology ◽

10.1099/00221287-61-1-27 ◽

1970 ◽

Vol 61 (1) ◽

pp. 27-31 ◽

Cited By ~ 53

Author(s):

M.-A. Riederer-Henderson ◽

P. W. Wilson

Keyword(s):

Nitrogen Fixation ◽

Sulphate Reducing Bacteria ◽

Reducing Bacteria

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Low-temperature sulphate reduction: biological versus abiological

Canadian Journal of Earth Sciences ◽

10.1139/e85-207 ◽

1985 ◽

Vol 22 (12) ◽

pp. 1910-1918 ◽

Cited By ~ 127

Author(s):

P. A. Trudinger ◽

L. A. Chambers ◽

J. W. Smith

Keyword(s):

Organic Matter ◽

Low Temperature ◽

Base Metal ◽

Ferrous Iron ◽

Sulphate Reduction ◽

Base Metal Sulphide ◽

Metal Sulphide ◽

Sulphate Reducing Bacteria ◽

Bacterial Sulphate Reduction ◽

Reducing Bacteria

Sulphate is considered to have been a major source of sulphide in strata-bound and stratiform base-metal sulphide deposits. Many of these deposits, however, appear to have been formed at moderate temperatures (<200 °C), which poses the question, By what mechanism(s) was sulphate reduced to sulphide? Two modes of reduction have been established experimentally: (1) catalysis by sulphate-reducing bacteria, which at present is only known to occur below ca. 100 °C; and (2) abiological reduction by ferrous iron or organic matter, which has only been clearly shown above ca. 250 °C.Several attempts have been made to demonstrate abiological reduction below 200 °C, and some new data are presented here. Although the results do not exclude the possibility that such a reaction may be geochemically significant, there has been no unequivocal demonstration of nett sulphide formation from sulphate at these temperatures.Recent studies of the microbiology of hydrothermal regions have opened up the prospect of bacterial sulphate reduction at much higher temperatures than had earlier been thought possible.

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